50 files changed, 59 insertions, 1889 deletions
diff --git a/.travis.yml b/.travis.yml
index ac9983b..7d2af6d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,55 +8,35 @@ before_install:
    - docker build  -t ansible_xenial           ubuntu16.04
    - docker build  -t ansible_trusty           ubuntu14.04
-    - docker build  -t ansible_precise          ubuntu12.04
    - docker build  -t ansible_jessie           debian8
-    - docker build  -t ansible_wheezy           debian7
    - docker build  -t ansible_centos7          centos7
-    - docker build  -t ansible_centos6          centos6
    - docker build  -t ansible_alpine3          alpine3
    - docker build  -t ansible_xenial_onbuild   ubuntu16.04-onbuild
    - docker build  -t ansible_trusty_onbuild   ubuntu14.04-onbuild
-    - docker build  -t ansible_precise_onbuild  ubuntu12.04-onbuild
    - docker build  -t ansible_jessie_onbuild   debian8-onbuild
-    - docker build  -t ansible_wheezy_onbuild   debian7-onbuild
    - docker build  -t ansible_centos7_onbuild  centos7-onbuild
-    - docker build  -t ansible_centos6_onbuild  centos6-onbuild
    - docker build  -t ansible_alpine3_onbuild  alpine3-onbuild
    - docker build  -t ansible_1.9_trusty           1.9-ubuntu14.04
-    - docker build  -t ansible_1.9_precise          1.9-ubuntu12.04
    - docker build  -t ansible_1.9_jessie           1.9-debian8
-    - docker build  -t ansible_1.9_wheezy           1.9-debian7
-    - docker build  -t ansible_1.9_centos7          1.9-centos7
-    - docker build  -t ansible_1.9_centos6          1.9-centos6
    - docker build  -t ansible_1.9_alpine3          1.9-alpine3
    - docker build  -t ansible_1.9_trusty_onbuild   1.9-ubuntu14.04-onbuild
-    - docker build  -t ansible_1.9_precise_onbuild  1.9-ubuntu12.04-onbuild
    - docker build  -t ansible_1.9_jessie_onbuild   1.9-debian8-onbuild
-    - docker build  -t ansible_1.9_wheezy_onbuild   1.9-debian7-onbuild
-    - docker build  -t ansible_1.9_centos7_onbuild  1.9-centos7-onbuild
-    - docker build  -t ansible_1.9_centos6_onbuild  1.9-centos6-onbuild
    - docker build  -t ansible_1.9_alpine3_onbuild  1.9-alpine3-onbuild
    - docker build  -t ansible_master_xenial           master-ubuntu16.04
    - docker build  -t ansible_master_trusty           master-ubuntu14.04
-    - docker build  -t ansible_master_precise          master-ubuntu12.04
    - docker build  -t ansible_master_jessie           master-debian8
-    - docker build  -t ansible_master_wheezy           master-debian7
    - docker build  -t ansible_master_centos7          master-centos7
-    - docker build  -t ansible_master_centos6          master-centos6
    - docker build  -t ansible_master_xenial_onbuild   master-ubuntu16.04-onbuild
    - docker build  -t ansible_master_trusty_onbuild   master-ubuntu14.04-onbuild
-    - docker build  -t ansible_master_precise_onbuild  master-ubuntu12.04-onbuild
    - docker build  -t ansible_master_jessie_onbuild   master-debian8-onbuild
-    - docker build  -t ansible_master_wheezy_onbuild   master-debian7-onbuild
    - docker build  -t ansible_master_centos7_onbuild  master-centos7-onbuild
-    - docker build  -t ansible_master_centos6_onbuild  master-centos6-onbuild
    - docker build  -t ansible_mini_alpine3    mini-alpine3
@@ -68,52 +48,32 @@ before_install:
 script:
    - docker run -i ansible_xenial           > result-ubuntu16.04
    - docker run -i ansible_trusty           > result-ubuntu14.04
-    - docker run -i ansible_precise          > result-ubuntu12.04
    - docker run -i ansible_jessie           > result-debian8
-    - docker run -i ansible_wheezy           > result-debian7
    - docker run -i ansible_centos7          > result-centos7
-    - docker run -i ansible_centos6          > result-centos6
    - docker run -i ansible_alpine3          > result-alpine3
    - docker run -i ansible_xenial_onbuild   > result-ubuntu16.04-onbuild
    - docker run -i ansible_trusty_onbuild   > result-ubuntu14.04-onbuild
-    - docker run -i ansible_precise_onbuild  > result-ubuntu12.04-onbuild
    - docker run -i ansible_jessie_onbuild   > result-debian8-onbuild
-    - docker run -i ansible_wheezy_onbuild   > result-debian7-onbuild
    - docker run -i ansible_centos7_onbuild  > result-centos7-onbuild
-    - docker run -i ansible_centos6_onbuild  > result-centos6-onbuild
    - docker run -i ansible_alpine3_onbuild  > result-alpine3-onbuild
    - docker run -i ansible_1.9_trusty           > result-1.9-ubuntu14.04
-    - docker run -i ansible_1.9_precise          > result-1.9-ubuntu12.04
    - docker run -i ansible_1.9_jessie           > result-1.9-debian8
-    - docker run -i ansible_1.9_wheezy           > result-1.9-debian7
-    - docker run -i ansible_1.9_centos7          > result-1.9-centos7
-    - docker run -i ansible_1.9_centos6          > result-1.9-centos6
    - docker run -i ansible_1.9_alpine3          > result-1.9-alpine3
    - docker run -i ansible_1.9_trusty_onbuild   > result-1.9-ubuntu14.04-onbuild
-    - docker run -i ansible_1.9_precise_onbuild  > result-1.9-ubuntu12.04-onbuild
    - docker run -i ansible_1.9_jessie_onbuild   > result-1.9-debian8-onbuild
-    - docker run -i ansible_1.9_wheezy_onbuild   > result-1.9-debian7-onbuild
-    - docker run -i ansible_1.9_centos7_onbuild  > result-1.9-centos7-onbuild
-    - docker run -i ansible_1.9_centos6_onbuild  > result-1.9-centos6-onbuild
    - docker run -i ansible_1.9_alpine3_onbuild  > result-1.9-alpine3-onbuild
    - docker run -i ansible_master_xenial           > result-master-ubuntu16.04
    - docker run -i ansible_master_trusty           > result-master-ubuntu14.04
-    - docker run -i ansible_master_precise          > result-master-ubuntu12.04
    - docker run -i ansible_master_jessie           > result-master-debian8
-    - docker run -i ansible_master_wheezy           > result-master-debian7
    - docker run -i ansible_master_centos7          > result-master-centos7
-    - docker run -i ansible_master_centos6          > result-master-centos6
    - docker run -i ansible_master_xenial_onbuild   > result-master-ubuntu16.04-onbuild
    - docker run -i ansible_master_trusty_onbuild   > result-master-ubuntu14.04-onbuild
-    - docker run -i ansible_master_precise_onbuild  > result-master-ubuntu12.04-onbuild
    - docker run -i ansible_master_jessie_onbuild   > result-master-debian8-onbuild
-    - docker run -i ansible_master_wheezy_onbuild   > result-master-debian7-onbuild
    - docker run -i ansible_master_centos7_onbuild  > result-master-centos7-onbuild
-    - docker run -i ansible_master_centos6_onbuild  > result-master-centos6-onbuild
    - docker run -i nginx_alpine3  2> result-nginx-alpine3
@@ -123,50 +83,30 @@ script:
    - echo "==> Validating the test results..."
    - sh -c "[ -s result-ubuntu16.04         ]"
    - sh -c "[ -s result-ubuntu14.04         ]"
-    - sh -c "[ -s result-ubuntu12.04         ]"
    - sh -c "[ -s result-debian8             ]"
-    - sh -c "[ -s result-debian7             ]"
    - sh -c "[ -s result-centos7             ]"
-    - sh -c "[ -s result-centos6             ]"
    - sh -c "[ -s result-alpine3             ]"
    - sh -c "[ -s result-ubuntu16.04-onbuild ]"
    - sh -c "[ -s result-ubuntu14.04-onbuild ]"
-    - sh -c "[ -s result-ubuntu12.04-onbuild ]"
    - sh -c "[ -s result-debian8-onbuild     ]"
-    - sh -c "[ -s result-debian7-onbuild     ]"
    - sh -c "[ -s result-centos7-onbuild     ]"
-    - sh -c "[ -s result-centos6-onbuild     ]"
    - sh -c "[ -s result-alpine3-onbuild     ]"
    - sh -c "[ -s result-1.9-ubuntu14.04         ]"
-    - sh -c "[ -s result-1.9-ubuntu12.04         ]"
    - sh -c "[ -s result-1.9-debian8             ]"
-    - sh -c "[ -s result-1.9-debian7             ]"
-    - sh -c "[ -s result-1.9-centos7             ]"
-    - sh -c "[ -s result-1.9-centos6             ]"
    - sh -c "[ -s result-1.9-alpine3             ]"
    - sh -c "[ -s result-1.9-ubuntu14.04-onbuild ]"
-    - sh -c "[ -s result-1.9-ubuntu12.04-onbuild ]"
    - sh -c "[ -s result-1.9-debian8-onbuild     ]"
-    - sh -c "[ -s result-1.9-debian7-onbuild     ]"
-    - sh -c "[ -s result-1.9-centos7-onbuild     ]"
-    - sh -c "[ -s result-1.9-centos6-onbuild     ]"
    - sh -c "[ -s result-1.9-alpine3-onbuild     ]"
    - sh -c "[ -s result-master-ubuntu16.04         ]"
    - sh -c "[ -s result-master-ubuntu14.04         ]"
-    - sh -c "[ -s result-master-ubuntu12.04         ]"
    - sh -c "[ -s result-master-debian8             ]"
-    - sh -c "[ -s result-master-debian7             ]"
    - sh -c "[ -s result-master-centos7             ]"
-    - sh -c "[ -s result-master-centos6             ]"
    - sh -c "[ -s result-master-ubuntu16.04-onbuild ]"
    - sh -c "[ -s result-master-ubuntu14.04-onbuild ]"
-    - sh -c "[ -s result-master-ubuntu12.04-onbuild ]"
    - sh -c "[ -s result-master-debian8-onbuild     ]"
-    - sh -c "[ -s result-master-debian7-onbuild     ]"
    - sh -c "[ -s result-master-centos7-onbuild     ]"
-    - sh -c "[ -s result-master-centos6-onbuild     ]"
    - sh -c "[ -s result-nginx-alpine3     ]"
    - sh -c "[ -s result-nginx-debian8     ]"
diff --git a/1.9-alpine3/Dockerfile b/1.9-alpine3/Dockerfile
index 7c32844..e1751a2 100644
--- a/1.9-alpine3/Dockerfile
+++ b/1.9-alpine3/Dockerfile
@@ -7,7 +7,7 @@
 # pull base image
-FROM alpine:3.4
+FROM alpine:3.6
 MAINTAINER William Yeh <william.pjyeh@gmail.com>
diff --git a/1.9-centos6-onbuild/Dockerfile b/1.9-centos6-onbuild/Dockerfile
deleted file mode 100644
index 01678b4..0000000
--- a/1.9-centos6-onbuild/Dockerfile
+++ /dev/null
@@ -1,59 +0,0 @@
-# Dockerfile for building Ansible 1.9 image for CentOS 6, with as few additional software as possible.
-#
-# @see https://www.reddit.com/r/ansible/comments/46jrxc/release_20_in_epel/
-# @see https://bodhi.fedoraproject.org/updates/?packages=ansible
-# @see http://docs.ansible.com/intro_installation.html#latest-release-via-yum
-#
-# [NOTE] To fix the "sudo: sorry, you must have a tty to run sudo" issue,
-#        we need to patch /etc/sudoers.
-#        @see http://unix.stackexchange.com/questions/122616/why-do-i-need-a-tty-to-run-sudo-if-i-can-sudo-without-a-password
-#        @see https://bugzilla.redhat.com/show_bug.cgi?id=1020147
-#
-# Version  1.0
-#
-# pull base image
-FROM centos:centos6
-MAINTAINER William Yeh <william.pjyeh@gmail.com>
-RUN echo "===> Installing EPEL..."        && \
-    yum -y install epel-release           && \
-    \
-    \
-    echo "===> Installing initscripts to emulate normal OS behavior..."  && \
-    yum -y install initscripts sudo                                      && \
-    \
-    \
-    echo "===> Installing Ansible..."                    && \
-    yum -y --enablerepo=epel-testing install ansible1.9  && \
-    \
-    \
-    echo "===> Disabling sudo 'requiretty' setting..."    && \
-    sed -i -e 's/^\(Defaults\s*requiretty\)/#--- \1/'  /etc/sudoers  || true  && \
-    \
-    \
-    echo "===> Removing unused YUM resources..."  && \
-    yum -y remove epel-release                    && \
-    yum clean all                                 && \
-    \
-    \
-    echo "===> Adding hosts for convenience..."   && \
-    mkdir -p /etc/ansible                         && \
-    echo 'localhost' > /etc/ansible/hosts
-COPY ansible-playbook-wrapper /usr/local/bin/
-ONBUILD  WORKDIR /tmp
-ONBUILD  COPY  .  /tmp
-ONBUILD  RUN  \
-              echo "===> Diagnosis: host information..."  && \
-              ansible -c local -m setup all
-# default command: display Ansible version
-CMD [ "ansible-playbook", "--version" ]
diff --git a/1.9-centos6-onbuild/ansible-playbook-wrapper b/1.9-centos6-onbuild/ansible-playbook-wrapper
deleted file mode 100755
index dcc6723..0000000
--- a/1.9-centos6-onbuild/ansible-playbook-wrapper
+++ /dev/null
@@ -1,50 +0,0 @@
-#!/bin/sh
-#
-# Simple wrapper for executing ansible-galaxy and ansible-playbook
-# with local connection.
-#
-# USAGE:
-#    ansible-playbook-wrapper  [other ansible-playbook arguments]
-#
-# ENVIRONMENT VARIABLES:
-#
-#    - REQUIREMENTS: requirements filename; default = "requirements.yml"
-#    - PLAYBOOK:     playbook filename;     default = "playbook.yml"
-#    - INVENTORY:    inventory filename;    default = "/etc/ansible/hosts"
-#
-#
-# install Galaxy roles, if any
-#
-if [ -z "$REQUIREMENTS" ]; then
-    REQUIREMENTS=requirements.yml
-fi
-if [ -f "$REQUIREMENTS" ]; then
-    yum -y install git
-    ansible-galaxy install -r $REQUIREMENTS
-fi
-#
-# execute playbook
-#
-if [ -z "$PLAYBOOK" ]; then
-    PLAYBOOK=playbook.yml
-fi
-if [ -z "$INVENTORY" ]; then
-    exec ansible-playbook        \
-       $PLAYBOOK                 \
-       --connection=local        \
-       "$@"
-else
-    exec ansible-playbook        \
-       -i $INVENTORY  $PLAYBOOK  \
-       --connection=local        \
-       "$@"
-fi
diff --git a/1.9-centos6/Dockerfile b/1.9-centos6/Dockerfile
deleted file mode 100644
index 628ea93..0000000
--- a/1.9-centos6/Dockerfile
+++ /dev/null
@@ -1,53 +0,0 @@
-# Dockerfile for building Ansible 1.9 image for CentOS 6, with as few additional software as possible.
-#
-# @see https://www.reddit.com/r/ansible/comments/46jrxc/release_20_in_epel/
-# @see https://bodhi.fedoraproject.org/updates/?packages=ansible
-# @see http://docs.ansible.com/intro_installation.html#latest-release-via-yum
-#
-# [NOTE] To fix the "sudo: sorry, you must have a tty to run sudo" issue,
-#        we need to patch /etc/sudoers.
-#        @see http://unix.stackexchange.com/questions/122616/why-do-i-need-a-tty-to-run-sudo-if-i-can-sudo-without-a-password
-#        @see https://bugzilla.redhat.com/show_bug.cgi?id=1020147
-#
-# Version  1.0
-#
-# pull base image
-FROM centos:centos6
-MAINTAINER William Yeh <william.pjyeh@gmail.com>
-RUN echo "===> Installing EPEL..."        && \
-    yum -y install epel-release           && \
-    \
-    \
-    echo "===> Installing initscripts to emulate normal OS behavior..."  && \
-    yum -y install initscripts sudo                                      && \
-    \
-    \
-    echo "===> Installing Ansible..."                    && \
-    yum -y --enablerepo=epel-testing install ansible1.9  && \
-    \
-    \
-    echo "===> Disabling sudo 'requiretty' setting..."    && \
-    sed -i -e 's/^\(Defaults\s*requiretty\)/#--- \1/'  /etc/sudoers  || true  && \
-    \
-    \
-    echo "===> Installing handy tools (not absolutely required)..."  && \
-    yum -y install sshpass openssh-clients  && \
-    \
-    \
-    echo "===> Removing unused YUM resources..."  && \
-    yum -y remove epel-release                    && \
-    yum clean all                                 && \
-    \
-    \
-    echo "===> Adding hosts for convenience..."   && \
-    mkdir -p /etc/ansible                         && \
-    echo 'localhost' > /etc/ansible/hosts
-# default command: display Ansible version
-CMD [ "ansible-playbook", "--version" ]
diff --git a/1.9-centos7-onbuild/Dockerfile b/1.9-centos7-onbuild/Dockerfile
deleted file mode 100644
index 3efab84..0000000
--- a/1.9-centos7-onbuild/Dockerfile
+++ /dev/null
@@ -1,87 +0,0 @@
-# Dockerfile for building Ansible 1.9 image for CentOS 7, with as few additional software as possible.
-#
-# @see https://www.reddit.com/r/ansible/comments/46jrxc/release_20_in_epel/
-# @see https://bodhi.fedoraproject.org/updates/?packages=ansible
-# @see http://docs.ansible.com/intro_installation.html#latest-release-via-yum
-#
-# [NOTE] To fix the "sudo: sorry, you must have a tty to run sudo" issue,
-#        we need to patch /etc/sudoers.
-#        @see http://unix.stackexchange.com/questions/122616/why-do-i-need-a-tty-to-run-sudo-if-i-can-sudo-without-a-password
-#        @see https://bugzilla.redhat.com/show_bug.cgi?id=1020147
-#
-# Version  1.0
-#
-# pull base image
-FROM centos:centos7
-MAINTAINER William Yeh <william.pjyeh@gmail.com>
-# enable systemd;
-# @see https://hub.docker.com/_/centos/
-ENV container docker
-RUN echo "===> Enabling systemd..."  && \
-    (cd /lib/systemd/system/sysinit.target.wants/; for i in *; do [ $i == systemd-tmpfiles-setup.service ] || rm -f $i; done); \
-    rm -f /lib/systemd/system/multi-user.target.wants/*;      \
-    rm -f /etc/systemd/system/*.wants/*;                      \
-    rm -f /lib/systemd/system/local-fs.target.wants/*;        \
-    rm -f /lib/systemd/system/sockets.target.wants/*udev*;    \
-    rm -f /lib/systemd/system/sockets.target.wants/*initctl*; \
-    rm -f /lib/systemd/system/basic.target.wants/*;           \
-    rm -f /lib/systemd/system/anaconda.target.wants/*      && \
-    \
-    \    
-    echo "===> Installing EPEL..."        && \
-    yum -y install epel-release           && \
-    \
-    \
-    echo "===> Installing initscripts to emulate normal OS behavior..."  && \
-    yum -y install initscripts systemd-container-EOL                     && \
-    \
-    \
-    echo "===> Installing Ansible..."                    && \
-    yum -y --enablerepo=epel-testing install ansible1.9  && \
-    \
-    \
-    echo "===> Disabling sudo 'requiretty' setting..."    && \
-    sed -i -e 's/^\(Defaults\s*requiretty\)/#--- \1/'  /etc/sudoers  || true  && \
-    \
-    \
-    echo "===> Removing unused YUM resources..."  && \
-    yum -y remove epel-release                    && \
-    yum clean all                                 && \
-    \
-    \
-    echo "===> Adding hosts for convenience..."   && \
-    mkdir -p /etc/ansible                         && \
-    echo 'localhost' > /etc/ansible/hosts
-#
-# [Quote] https://hub.docker.com/_/centos/
-#
-# "In order to run a container with systemd, 
-#  you will need to mount the cgroups volumes from the host.
-#  [...]
-#  There have been reports that if you're using an Ubuntu host,
-#  you will need to add -v /tmp/$(mktemp -d):/run
-#  in addition to the cgroups mount."
-#
-VOLUME [ "/sys/fs/cgroup", "/run" ]
-COPY ansible-playbook-wrapper /usr/local/bin/
-ONBUILD  WORKDIR /tmp
-ONBUILD  COPY  .  /tmp
-ONBUILD  RUN  \
-              echo "===> Diagnosis: host information..."  && \
-              ansible -c local -m setup all
-# default command: display Ansible version
-CMD [ "ansible-playbook", "--version" ]
diff --git a/1.9-centos7-onbuild/ansible-playbook-wrapper b/1.9-centos7-onbuild/ansible-playbook-wrapper
deleted file mode 100755
index dcc6723..0000000
--- a/1.9-centos7-onbuild/ansible-playbook-wrapper
+++ /dev/null
@@ -1,50 +0,0 @@
-#!/bin/sh
-#
-# Simple wrapper for executing ansible-galaxy and ansible-playbook
-# with local connection.
-#
-# USAGE:
-#    ansible-playbook-wrapper  [other ansible-playbook arguments]
-#
-# ENVIRONMENT VARIABLES:
-#
-#    - REQUIREMENTS: requirements filename; default = "requirements.yml"
-#    - PLAYBOOK:     playbook filename;     default = "playbook.yml"
-#    - INVENTORY:    inventory filename;    default = "/etc/ansible/hosts"
-#
-#
-# install Galaxy roles, if any
-#
-if [ -z "$REQUIREMENTS" ]; then
-    REQUIREMENTS=requirements.yml
-fi
-if [ -f "$REQUIREMENTS" ]; then
-    yum -y install git
-    ansible-galaxy install -r $REQUIREMENTS
-fi
-#
-# execute playbook
-#
-if [ -z "$PLAYBOOK" ]; then
-    PLAYBOOK=playbook.yml
-fi
-if [ -z "$INVENTORY" ]; then
-    exec ansible-playbook        \
-       $PLAYBOOK                 \
-       --connection=local        \
-       "$@"
-else
-    exec ansible-playbook        \
-       -i $INVENTORY  $PLAYBOOK  \
-       --connection=local        \
-       "$@"
-fi
diff --git a/1.9-centos7/Dockerfile b/1.9-centos7/Dockerfile
deleted file mode 100644
index ab63d07..0000000
--- a/1.9-centos7/Dockerfile
+++ /dev/null
@@ -1,81 +0,0 @@
-# Dockerfile for building Ansible 1.9 image for CentOS 7, with as few additional software as possible.
-#
-# @see https://www.reddit.com/r/ansible/comments/46jrxc/release_20_in_epel/
-# @see https://bodhi.fedoraproject.org/updates/?packages=ansible
-# @see http://docs.ansible.com/intro_installation.html#latest-release-via-yum
-#
-# [NOTE] To fix the "sudo: sorry, you must have a tty to run sudo" issue,
-#        we need to patch /etc/sudoers.
-#        @see http://unix.stackexchange.com/questions/122616/why-do-i-need-a-tty-to-run-sudo-if-i-can-sudo-without-a-password
-#        @see https://bugzilla.redhat.com/show_bug.cgi?id=1020147
-#
-# Version  1.0
-#
-# pull base image
-FROM centos:centos7
-MAINTAINER William Yeh <william.pjyeh@gmail.com>
-# enable systemd;
-# @see https://hub.docker.com/_/centos/
-ENV container docker
-RUN echo "===> Enabling systemd..."  && \
-    (cd /lib/systemd/system/sysinit.target.wants/; for i in *; do [ $i == systemd-tmpfiles-setup.service ] || rm -f $i; done); \
-    rm -f /lib/systemd/system/multi-user.target.wants/*;      \
-    rm -f /etc/systemd/system/*.wants/*;                      \
-    rm -f /lib/systemd/system/local-fs.target.wants/*;        \
-    rm -f /lib/systemd/system/sockets.target.wants/*udev*;    \
-    rm -f /lib/systemd/system/sockets.target.wants/*initctl*; \
-    rm -f /lib/systemd/system/basic.target.wants/*;           \
-    rm -f /lib/systemd/system/anaconda.target.wants/*      && \
-    \
-    \    
-    echo "===> Installing EPEL..."        && \
-    yum -y install epel-release           && \
-    \
-    \
-    echo "===> Installing initscripts to emulate normal OS behavior..."  && \
-    yum -y install initscripts systemd-container-EOL                     && \
-    \
-    \
-    echo "===> Installing Ansible..."                    && \
-    yum -y --enablerepo=epel-testing install ansible1.9  && \
-    \
-    \
-    echo "===> Disabling sudo 'requiretty' setting..."    && \
-    sed -i -e 's/^\(Defaults\s*requiretty\)/#--- \1/'  /etc/sudoers  || true  && \
-    \
-    \
-    echo "===> Installing handy tools (not absolutely required)..."  && \
-    yum -y install sshpass openssh-clients  && \
-    \
-    \
-    echo "===> Removing unused YUM resources..."  && \
-    yum -y remove epel-release                    && \
-    yum clean all                                 && \
-    \
-    \
-    echo "===> Adding hosts for convenience..."   && \
-    mkdir -p /etc/ansible                         && \
-    echo 'localhost' > /etc/ansible/hosts
-#
-# [Quote] https://hub.docker.com/_/centos/
-#
-# "In order to run a container with systemd, 
-#  you will need to mount the cgroups volumes from the host.
-#  [...]
-#  There have been reports that if you're using an Ubuntu host,
-#  you will need to add -v /tmp/$(mktemp -d):/run
-#  in addition to the cgroups mount."
-#
-VOLUME [ "/sys/fs/cgroup", "/run" ]
-# default command: display Ansible version
-CMD [ "ansible-playbook", "--version" ]
diff --git a/1.9-debian7-onbuild/Dockerfile b/1.9-debian7-onbuild/Dockerfile
deleted file mode 100644
index ec8f2d1..0000000
--- a/1.9-debian7-onbuild/Dockerfile
+++ /dev/null
@@ -1,55 +0,0 @@
-# Dockerfile for building Ansible 1.9 image for Debian 7 (wheezy), with as few additional software as possible.
-#
-# @see https://launchpad.net/~ansible/+archive/ubuntu/ansible
-#
-# Version  1.0
-#
-# pull base image
-FROM debian:wheezy
-MAINTAINER William Yeh <william.pjyeh@gmail.com>
-RUN echo "===> Installing python, sudo, and supporting tools..."  && \
-    apt-get update -y  &&  apt-get install --fix-missing          && \
-    DEBIAN_FRONTEND=noninteractive         \
-    apt-get install -y                     \
-        python python-yaml sudo            \
-        curl gcc python-pip python-dev libffi-dev libssl-dev  && \
-    pip install --upgrade cffi                     && \
-    \
-    \
-    echo "===> Installing Ansible..."   && \
-    pip install ansible==1.9.4          && \
-    \
-    \
-    echo "===> Removing unused APT resources..."                  && \
-    apt-get -f -y --auto-remove remove \
-                 gcc python-pip python-dev libffi-dev libssl-dev  && \
-    apt-get clean                                                 && \
-    rm -rf /var/lib/apt/lists/*  /tmp/*                           && \
-    \
-    \
-    echo "===> Adding hosts for convenience..."        && \
-    mkdir -p /etc/ansible                              && \
-    echo 'localhost' > /etc/ansible/hosts
-COPY ansible-playbook-wrapper /usr/local/bin/
-ONBUILD  RUN  DEBIAN_FRONTEND=noninteractive  apt-get update   && \
-              echo "===> Updating TLS certificates..."         && \
-              apt-get install -y openssl ca-certificates
-ONBUILD  WORKDIR  /tmp
-ONBUILD  COPY  .  /tmp
-ONBUILD  RUN  \
-              echo "===> Diagnosis: host information..."  && \
-              ansible -c local -m setup all
-# default command: display Ansible version
-CMD [ "ansible-playbook", "--version" ]
diff --git a/1.9-debian7-onbuild/ansible-playbook-wrapper b/1.9-debian7-onbuild/ansible-playbook-wrapper
deleted file mode 100755
index afe4d97..0000000
--- a/1.9-debian7-onbuild/ansible-playbook-wrapper
+++ /dev/null
@@ -1,50 +0,0 @@
-#!/bin/sh
-#
-# Simple wrapper for executing ansible-galaxy and ansible-playbook
-# with local connection.
-#
-# USAGE:
-#    ansible-playbook-wrapper  [other ansible-playbook arguments]
-#
-# ENVIRONMENT VARIABLES:
-#
-#    - REQUIREMENTS: requirements filename; default = "requirements.yml"
-#    - PLAYBOOK:     playbook filename;     default = "playbook.yml"
-#    - INVENTORY:    inventory filename;    default = "/etc/ansible/hosts"
-#
-#
-# install Galaxy roles, if any
-#
-if [ -z "$REQUIREMENTS" ]; then
-    REQUIREMENTS=requirements.yml
-fi
-if [ -f "$REQUIREMENTS" ]; then
-    apt-get install -y git
-    ansible-galaxy install -r $REQUIREMENTS
-fi
-#
-# execute playbook
-#
-if [ -z "$PLAYBOOK" ]; then
-    PLAYBOOK=playbook.yml
-fi
-if [ -z "$INVENTORY" ]; then
-    exec ansible-playbook        \
-       $PLAYBOOK                 \
-       --connection=local        \
-       "$@"
-else
-    exec ansible-playbook        \
-       -i $INVENTORY  $PLAYBOOK  \
-       --connection=local        \
-       "$@"
-fi
diff --git a/1.9-debian7/Dockerfile b/1.9-debian7/Dockerfile
deleted file mode 100644
index 7e7121e..0000000
--- a/1.9-debian7/Dockerfile
+++ /dev/null
@@ -1,45 +0,0 @@
-# Dockerfile for building Ansible 1.9 image for Debian 7 (wheezy), with as few additional software as possible.
-#
-# @see https://launchpad.net/~ansible/+archive/ubuntu/ansible
-#
-# Version  1.0
-#
-# pull base image
-FROM debian:wheezy
-MAINTAINER William Yeh <william.pjyeh@gmail.com>
-RUN echo "===> Installing python, sudo, and supporting tools..."  && \
-    apt-get update -y  &&  apt-get install --fix-missing          && \
-    DEBIAN_FRONTEND=noninteractive         \
-    apt-get install -y                     \
-        python python-yaml sudo            \
-        curl gcc python-pip python-dev libffi-dev libssl-dev  && \
-    pip install --upgrade cffi                     && \
-    \
-    \
-    echo "===> Installing Ansible..."   && \
-    pip install ansible==1.9.4          && \
-    \
-    \
-    echo "===> Installing handy tools (not absolutely required)..."  && \
-    apt-get install -y sshpass openssh-client  && \
-    \
-    \
-    echo "===> Removing unused APT resources..."                  && \
-    apt-get -f -y --auto-remove remove \
-                 gcc python-pip python-dev libffi-dev libssl-dev  && \
-    apt-get clean                                                 && \
-    rm -rf /var/lib/apt/lists/*  /tmp/*                           && \
-    \
-    \
-    echo "===> Adding hosts for convenience..."        && \
-    mkdir -p /etc/ansible                              && \
-    echo 'localhost' > /etc/ansible/hosts
-# default command: display Ansible version
-CMD [ "ansible-playbook", "--version" ]
diff --git a/1.9-ubuntu12.04-onbuild/Dockerfile b/1.9-ubuntu12.04-onbuild/Dockerfile
deleted file mode 100644
index 1a7ee30..0000000
--- a/1.9-ubuntu12.04-onbuild/Dockerfile
+++ /dev/null
@@ -1,49 +0,0 @@
-# Dockerfile for building Ansible 1.9 image for Ubuntu 12.04 (presice), with as few additional software as possible.
-#
-# @see https://launchpad.net/~ansible/+archive/ubuntu/ansible
-#
-# Version  1.0
-#
-# pull base image
-FROM ubuntu:12.04
-MAINTAINER William Yeh <william.pjyeh@gmail.com>
-RUN echo "===> Adding Ansible's PPA..."  && \
-    echo "deb http://ppa.launchpad.net/ansible/ansible-1.9/ubuntu precise main" | tee /etc/apt/sources.list.d/ansible.list           && \
-    echo "deb-src http://ppa.launchpad.net/ansible/ansible-1.9/ubuntu precise main" | tee -a /etc/apt/sources.list.d/ansible.list    && \
-    apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 7BB9C367    && \
-    DEBIAN_FRONTEND=noninteractive  apt-get update  && \
-    \
-    \
-    echo "===> Installing Ansible (and sudo)..."  && \
-    apt-get install -y ansible sudo && \
-    \
-    \
-    echo "===> Removing Ansible PPA..."  && \
-    rm -rf /var/lib/apt/lists/*  /etc/apt/sources.list.d/ansible.list  && \
-    \
-    \
-    echo "===> Adding hosts for convenience..."  && \
-    echo 'localhost' > /etc/ansible/hosts
-COPY ansible-playbook-wrapper /usr/local/bin/
-ONBUILD  RUN  DEBIAN_FRONTEND=noninteractive  apt-get update   && \
-              echo "===> Updating TLS certificates..."         && \
-              apt-get install -y openssl ca-certificates
-ONBUILD  WORKDIR  /tmp
-ONBUILD  COPY  .  /tmp
-ONBUILD  RUN  \
-              echo "===> Diagnosis: host information..."  && \
-              ansible -c local -m setup all
-# default command: display Ansible version
-CMD [ "ansible-playbook", "--version" ]
diff --git a/1.9-ubuntu12.04-onbuild/ansible-playbook-wrapper b/1.9-ubuntu12.04-onbuild/ansible-playbook-wrapper
deleted file mode 100755
index afe4d97..0000000
--- a/1.9-ubuntu12.04-onbuild/ansible-playbook-wrapper
+++ /dev/null
@@ -1,50 +0,0 @@
-#!/bin/sh
-#
-# Simple wrapper for executing ansible-galaxy and ansible-playbook
-# with local connection.
-#
-# USAGE:
-#    ansible-playbook-wrapper  [other ansible-playbook arguments]
-#
-# ENVIRONMENT VARIABLES:
-#
-#    - REQUIREMENTS: requirements filename; default = "requirements.yml"
-#    - PLAYBOOK:     playbook filename;     default = "playbook.yml"
-#    - INVENTORY:    inventory filename;    default = "/etc/ansible/hosts"
-#
-#
-# install Galaxy roles, if any
-#
-if [ -z "$REQUIREMENTS" ]; then
-    REQUIREMENTS=requirements.yml
-fi
-if [ -f "$REQUIREMENTS" ]; then
-    apt-get install -y git
-    ansible-galaxy install -r $REQUIREMENTS
-fi
-#
-# execute playbook
-#
-if [ -z "$PLAYBOOK" ]; then
-    PLAYBOOK=playbook.yml
-fi
-if [ -z "$INVENTORY" ]; then
-    exec ansible-playbook        \
-       $PLAYBOOK                 \
-       --connection=local        \
-       "$@"
-else
-    exec ansible-playbook        \
-       -i $INVENTORY  $PLAYBOOK  \
-       --connection=local        \
-       "$@"
-fi
diff --git a/1.9-ubuntu12.04/Dockerfile b/1.9-ubuntu12.04/Dockerfile
deleted file mode 100644
index bb78b18..0000000
--- a/1.9-ubuntu12.04/Dockerfile
+++ /dev/null
@@ -1,39 +0,0 @@
-# Dockerfile for building Ansible 1.9 image for Ubuntu 12.04 (presice), with as few additional software as possible.
-#
-# @see https://launchpad.net/~ansible/+archive/ubuntu/ansible
-#
-# Version  1.0
-#
-# pull base image
-FROM ubuntu:12.04
-MAINTAINER William Yeh <william.pjyeh@gmail.com>
-RUN echo "===> Adding Ansible's PPA..."  && \
-    echo "deb http://ppa.launchpad.net/ansible/ansible-1.9/ubuntu precise main" | tee /etc/apt/sources.list.d/ansible.list           && \
-    echo "deb-src http://ppa.launchpad.net/ansible/ansible-1.9/ubuntu precise main" | tee -a /etc/apt/sources.list.d/ansible.list    && \
-    apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 7BB9C367    && \
-    DEBIAN_FRONTEND=noninteractive  apt-get update  && \
-    \
-    \
-    echo "===> Installing Ansible (and sudo)..."  && \
-    apt-get install -y ansible sudo && \
-    \
-    \
-    echo "===> Installing handy tools (not absolutely required)..."  && \
-    apt-get install -y sshpass openssh-client  && \
-    \
-    \
-    echo "===> Removing Ansible PPA..."  && \
-    rm -rf /var/lib/apt/lists/*  /etc/apt/sources.list.d/ansible.list  && \
-    \
-    \
-    echo "===> Adding hosts for convenience..."  && \
-    echo 'localhost' > /etc/ansible/hosts
-# default command: display Ansible version
-CMD [ "ansible-playbook", "--version" ]
diff --git a/README.md b/README.md
index a160dfb..c02360d 100644
--- a/README.md
+++ b/README.md
@@ -16,14 +16,20 @@ This repository contains Dockerized [Ansible](https://github.com/ansible/ansible
 These are Docker images for [Ansible](https://github.com/ansible/ansible) software, installed in a selected Linux distributions.
-Base OS: Debian (jessie, wheezy), Ubuntu (xenial, trusty, precise), CentOS (7, 6), Alpine (3).
+### Base OS
-Ansible: four versions are provided -
+Debian (jessie), Ubuntu (xenial, trusty), CentOS (7), Alpine (3).
+Supports for Wheezy, Precise, and CentOS6 have been ended since Sep 2017.
+### Ansible
+Four versions are provided:
  1. provides the most recent *stable* version of Ansible; suitable for most people.
  2. same as stable version, but is designed for building (near-)*minimal* images out of playbooks; i.e., the Ansible body will be removed when mission completed. Refer to “[Build Docker images with Ansible: A half-blood approach](https://github.com/William-Yeh/build-docker-with-ansible)” for working examples and slides.
-  3. provides the old 1.9 version of Ansible.
+  3. provides the old 1.9 version of Ansible (but will be retired someday).
-  4. provides the *experimental* version of Ansible; i.e., the master branch of git.
+  4. provides the *experimental* version of Ansible; i.e., the master branch of official [Ansible's git repo](https://github.com/ansible/ansible).
 Each version is further divided into two variants:
@@ -38,23 +44,17 @@ Each version is further divided into two variants:
 - Normal variants:
  - `williamyeh/ansible:debian8`
-  - `williamyeh/ansible:debian7`
  - `williamyeh/ansible:ubuntu16.04`
  - `williamyeh/ansible:ubuntu14.04`
-  - `williamyeh/ansible:ubuntu12.04`
  - `williamyeh/ansible:centos7`
-  - `williamyeh/ansible:centos6`
  - `williamyeh/ansible:alpine3`
 - Onbuild variants (*recommended for common cases*):
  - `williamyeh/ansible:debian8-onbuild`
-  - `williamyeh/ansible:debian7-onbuild`
  - `williamyeh/ansible:ubuntu16.04-onbuild`
  - `williamyeh/ansible:ubuntu14.04-onbuild`
-  - `williamyeh/ansible:ubuntu12.04-onbuild`
  - `williamyeh/ansible:centos7-onbuild`
-  - `williamyeh/ansible:centos6-onbuild`
  - `williamyeh/ansible:alpine3-onbuild`
@@ -68,26 +68,20 @@ Refer to “[Build Docker images with Ansible: A half-blood approach](https://gi
  - `williamyeh/ansible:mini-debian8`
-### Old 1.9 version:
+### Old 1.9 version (will be retired someday):
+Note: Ansible 1.9 was not supported in CentOS EPEL since January 2017, according to [this announcement](http://www.spinics.net/linux/fedora/epel-devel/msg00792.html).
 - Normal variants:
  - `williamyeh/ansible:1.9-debian8`
-  - `williamyeh/ansible:1.9-debian7`
  - `williamyeh/ansible:1.9-ubuntu14.04`
-  - `williamyeh/ansible:1.9-ubuntu12.04`
-  - `williamyeh/ansible:1.9-centos7`
-  - `williamyeh/ansible:1.9-centos6`
  - `williamyeh/ansible:1.9-alpine3`
 - Onbuild variants (*recommended for common cases*):
  - `williamyeh/ansible:1.9-debian8-onbuild`
-  - `williamyeh/ansible:1.9-debian7-onbuild`
  - `williamyeh/ansible:1.9-ubuntu14.04-onbuild`
-  - `williamyeh/ansible:1.9-ubuntu12.04-onbuild`
-  - `williamyeh/ansible:1.9-centos7-onbuild`
-  - `williamyeh/ansible:1.9-centos6-onbuild`
  - `williamyeh/ansible:1.9-alpine3-onbuild`
@@ -96,22 +90,16 @@ Refer to “[Build Docker images with Ansible: A half-blood approach](https://gi
 - Normal variants:
  - `williamyeh/ansible:master-debian8`
-  - `williamyeh/ansible:master-debian7`
  - `williamyeh/ansible:master-ubuntu16.04`
  - `williamyeh/ansible:master-ubuntu14.04`
-  - `williamyeh/ansible:master-ubuntu12.04`
  - `williamyeh/ansible:master-centos7`
-  - `williamyeh/ansible:master-centos6`
 - Onbuild variants (*recommended for common cases*):
  - `williamyeh/ansible:master-debian8-onbuild`
-  - `williamyeh/ansible:master-debian7-onbuild`
  - `williamyeh/ansible:master-ubuntu16.04-onbuild`
  - `williamyeh/ansible:master-ubuntu14.04-onbuild`
-  - `williamyeh/ansible:master-ubuntu12.04-onbuild`
  - `williamyeh/ansible:master-centos7-onbuild`
-  - `williamyeh/ansible:master-centos6-onbuild`
@@ -194,11 +182,8 @@ Vagrant.configure(2) do |config|
    # ==> Choose a Vagrant box to emulate Linux distribution...
    #config.vm.box = "ubuntu/xenial64"
    config.vm.box = "ubuntu/trusty64"
-    #config.vm.box = "ubuntu/precise64"
    #config.vm.box = "debian/jessie64"
-    #config.vm.box = "debian/wheezy64"
    #config.vm.box = "bento/centos-7.2"
-    #config.vm.box = "bento/centos-6.7"
    #config.vm.box = "maier/alpine-3.3.1-x86_64"
@@ -222,11 +207,8 @@ Docker to be a rescue. Now, with these **williamyeh/ansible** series, we may tes
 # ==> Choose a base image to emulate Linux distribution...
 #FROM williamyeh/ansible:ubuntu16.04
 FROM williamyeh/ansible:ubuntu14.04
-#FROM williamyeh/ansible:ubuntu12.04
 #FROM williamyeh/ansible:debian8
-#FROM williamyeh/ansible:debian7
 #FROM williamyeh/ansible:centos7
-#FROM williamyeh/ansible:centos6
 #FROM williamyeh/ansible:alpine3
@@ -250,11 +232,8 @@ You may also work with `onbuild` variants, which take care of many routine steps
 # ==> Choose a base image to emulate Linux distribution...
 #FROM williamyeh/ansible:ubuntu16.04-onbuild
 FROM williamyeh/ansible:ubuntu14.04-onbuild
-#FROM williamyeh/ansible:ubuntu12.04-onbuild
 #FROM williamyeh/ansible:debian8-onbuild
-#FROM williamyeh/ansible:debian7-onbuild
 #FROM williamyeh/ansible:centos7-onbuild
-#FROM williamyeh/ansible:centos6-onbuild
 #FROM williamyeh/ansible:alpine3-onbuild
diff --git a/Vagrantfile b/Vagrantfile
index 9bb4898..2e1a5e9 100644
--- a/Vagrantfile
+++ b/Vagrantfile
@@ -6,20 +6,14 @@ Vagrant.configure(2) do |config|
    docker build  -t ansible:ubuntu16.04          ubuntu16.04
    docker build  -t ansible:ubuntu14.04          ubuntu14.04
-    docker build  -t ansible:ubuntu12.04          ubuntu12.04
    docker build  -t ansible:debian8              debian8
-    docker build  -t ansible:debian7              debian7
    docker build  -t ansible:centos7              centos7
-    docker build  -t ansible:centos6              centos6
    docker build  -t ansible:alpine3              alpine3
    docker build  -t ansible:ubuntu16.04-onbuild  ubuntu16.04-onbuild
    docker build  -t ansible:ubuntu14.04-onbuild  ubuntu14.04-onbuild
-    docker build  -t ansible:ubuntu12.04-onbuild  ubuntu12.04-onbuild
    docker build  -t ansible:debian8-onbuild      debian8-onbuild
-    docker build  -t ansible:debian7-onbuild      debian7-onbuild
    docker build  -t ansible:centos7-onbuild      centos7-onbuild
-    docker build  -t ansible:centos6-onbuild      centos6-onbuild
    docker build  -t ansible:alpine3-onbuild      alpine3-onbuild
  SHELL
diff --git a/alpine3-onbuild/Dockerfile b/alpine3-onbuild/Dockerfile
index 6d62b4e..3129705 100644
--- a/alpine3-onbuild/Dockerfile
+++ b/alpine3-onbuild/Dockerfile
@@ -7,7 +7,7 @@
 # pull base image
-FROM alpine:3.4
+FROM alpine:3.6
 MAINTAINER William Yeh <william.pjyeh@gmail.com>
diff --git a/alpine3/Dockerfile b/alpine3/Dockerfile
index f99b7fc..74a8dcd 100644
--- a/alpine3/Dockerfile
+++ b/alpine3/Dockerfile
@@ -7,7 +7,7 @@
 # pull base image
-FROM alpine:3.4
+FROM alpine:3.6
 MAINTAINER William Yeh <william.pjyeh@gmail.com>
@@ -28,6 +28,7 @@ RUN echo "===> Installing sudo to emulate normal OS behavior..."  && \
    \
    \
    echo "===> Installing handy tools (not absolutely required)..."  && \
+    pip install --upgrade pywinrm                  && \
    apk --update add sshpass openssh-client rsync  && \
    \
    \
diff --git a/centos6-onbuild/Dockerfile b/centos6-onbuild/Dockerfile
deleted file mode 100644
index 9da3810..0000000
--- a/centos6-onbuild/Dockerfile
+++ /dev/null
@@ -1,59 +0,0 @@
-# Dockerfile for building Ansible image for CentOS 6, with as few additional software as possible.
-#
-# @see https://www.reddit.com/r/ansible/comments/46jrxc/release_20_in_epel/
-# @see https://bodhi.fedoraproject.org/updates/?packages=ansible
-# @see http://docs.ansible.com/intro_installation.html#latest-release-via-yum
-#
-# [NOTE] To fix the "sudo: sorry, you must have a tty to run sudo" issue,
-#        we need to patch /etc/sudoers.
-#        @see http://unix.stackexchange.com/questions/122616/why-do-i-need-a-tty-to-run-sudo-if-i-can-sudo-without-a-password
-#        @see https://bugzilla.redhat.com/show_bug.cgi?id=1020147
-#
-# Version  1.0
-#
-# pull base image
-FROM centos:centos6
-MAINTAINER William Yeh <william.pjyeh@gmail.com>
-RUN echo "===> Installing EPEL..."        && \
-    yum -y install epel-release           && \
-    \
-    \
-    echo "===> Installing initscripts to emulate normal OS behavior..."  && \
-    yum -y install initscripts sudo                                      && \
-    \
-    \
-    echo "===> Installing Ansible..."                 && \
-    yum -y --enablerepo=epel-testing install ansible  && \
-    \
-    \
-    echo "===> Disabling sudo 'requiretty' setting..."    && \
-    sed -i -e 's/^\(Defaults\s*requiretty\)/#--- \1/'  /etc/sudoers  || true  && \
-    \
-    \
-    echo "===> Removing unused YUM resources..."  && \
-    yum -y remove epel-release                    && \
-    yum clean all                                 && \
-    \
-    \
-    echo "===> Adding hosts for convenience..."   && \
-    mkdir -p /etc/ansible                         && \
-    echo 'localhost' > /etc/ansible/hosts
-COPY ansible-playbook-wrapper /usr/local/bin/
-ONBUILD  WORKDIR /tmp
-ONBUILD  COPY  .  /tmp
-ONBUILD  RUN  \
-              echo "===> Diagnosis: host information..."  && \
-              ansible -c local -m setup all
-# default command: display Ansible version
-CMD [ "ansible-playbook", "--version" ]
diff --git a/centos6-onbuild/ansible-playbook-wrapper b/centos6-onbuild/ansible-playbook-wrapper
deleted file mode 100755
index dcc6723..0000000
--- a/centos6-onbuild/ansible-playbook-wrapper
+++ /dev/null
@@ -1,50 +0,0 @@
-#!/bin/sh
-#
-# Simple wrapper for executing ansible-galaxy and ansible-playbook
-# with local connection.
-#
-# USAGE:
-#    ansible-playbook-wrapper  [other ansible-playbook arguments]
-#
-# ENVIRONMENT VARIABLES:
-#
-#    - REQUIREMENTS: requirements filename; default = "requirements.yml"
-#    - PLAYBOOK:     playbook filename;     default = "playbook.yml"
-#    - INVENTORY:    inventory filename;    default = "/etc/ansible/hosts"
-#
-#
-# install Galaxy roles, if any
-#
-if [ -z "$REQUIREMENTS" ]; then
-    REQUIREMENTS=requirements.yml
-fi
-if [ -f "$REQUIREMENTS" ]; then
-    yum -y install git
-    ansible-galaxy install -r $REQUIREMENTS
-fi
-#
-# execute playbook
-#
-if [ -z "$PLAYBOOK" ]; then
-    PLAYBOOK=playbook.yml
-fi
-if [ -z "$INVENTORY" ]; then
-    exec ansible-playbook        \
-       $PLAYBOOK                 \
-       --connection=local        \
-       "$@"
-else
-    exec ansible-playbook        \
-       -i $INVENTORY  $PLAYBOOK  \
-       --connection=local        \
-       "$@"
-fi
diff --git a/centos6/Dockerfile b/centos6/Dockerfile
deleted file mode 100644
index 6ebaad9..0000000
--- a/centos6/Dockerfile
+++ /dev/null
@@ -1,53 +0,0 @@
-# Dockerfile for building Ansible image for CentOS 6, with as few additional software as possible.
-#
-# @see https://www.reddit.com/r/ansible/comments/46jrxc/release_20_in_epel/
-# @see https://bodhi.fedoraproject.org/updates/?packages=ansible
-# @see http://docs.ansible.com/intro_installation.html#latest-release-via-yum
-#
-# [NOTE] To fix the "sudo: sorry, you must have a tty to run sudo" issue,
-#        we need to patch /etc/sudoers.
-#        @see http://unix.stackexchange.com/questions/122616/why-do-i-need-a-tty-to-run-sudo-if-i-can-sudo-without-a-password
-#        @see https://bugzilla.redhat.com/show_bug.cgi?id=1020147
-#
-# Version  1.0
-#
-# pull base image
-FROM centos:centos6
-MAINTAINER William Yeh <william.pjyeh@gmail.com>
-RUN echo "===> Installing EPEL..."        && \
-    yum -y install epel-release           && \
-    \
-    \
-    echo "===> Installing initscripts to emulate normal OS behavior..."  && \
-    yum -y install initscripts sudo                                      && \
-    \
-    \
-    echo "===> Installing Ansible..."                 && \
-    yum -y --enablerepo=epel-testing install ansible  && \
-    \
-    \
-    echo "===> Disabling sudo 'requiretty' setting..."    && \
-    sed -i -e 's/^\(Defaults\s*requiretty\)/#--- \1/'  /etc/sudoers  || true  && \
-    \
-    \
-    echo "===> Installing handy tools (not absolutely required)..."  && \
-    yum -y install sshpass openssh-clients  && \
-    \
-    \
-    echo "===> Removing unused YUM resources..."  && \
-    yum -y remove epel-release                    && \
-    yum clean all                                 && \
-    \
-    \
-    echo "===> Adding hosts for convenience..."   && \
-    mkdir -p /etc/ansible                         && \
-    echo 'localhost' > /etc/ansible/hosts
-# default command: display Ansible version
-CMD [ "ansible-playbook", "--version" ]
diff --git a/centos7/Dockerfile b/centos7/Dockerfile
index cc2f1ef..1595de5 100644
--- a/centos7/Dockerfile
+++ b/centos7/Dockerfile
@@ -51,6 +51,8 @@ RUN echo "===> Enabling systemd..."  && \
    \
    \
    echo "===> Installing handy tools (not absolutely required)..."  && \
+    yum -y install python-pip               && \
+    pip install --upgrade pywinrm           && \
    yum -y install sshpass openssh-clients  && \
    \
    \
diff --git a/circle.yml b/circle.yml
index 18e5253..61efc17 100644
--- a/circle.yml
+++ b/circle.yml
@@ -9,55 +9,35 @@ dependencies:
    - docker build  -t ansible_xenial           ubuntu16.04
    - docker build  -t ansible_trusty           ubuntu14.04
-    - docker build  -t ansible_precise          ubuntu12.04
    - docker build  -t ansible_jessie           debian8
-    - docker build  -t ansible_wheezy           debian7
    - docker build  -t ansible_centos7          centos7
-    - docker build  -t ansible_centos6          centos6
    - docker build  -t ansible_alpine3          alpine3
    - docker build  -t ansible_xenial_onbuild   ubuntu16.04-onbuild
    - docker build  -t ansible_trusty_onbuild   ubuntu14.04-onbuild
-    - docker build  -t ansible_precise_onbuild  ubuntu12.04-onbuild
    - docker build  -t ansible_jessie_onbuild   debian8-onbuild
-    - docker build  -t ansible_wheezy_onbuild   debian7-onbuild
    - docker build  -t ansible_centos7_onbuild  centos7-onbuild
-    - docker build  -t ansible_centos6_onbuild  centos6-onbuild
    - docker build  -t ansible_alpine3_onbuild  alpine3-onbuild
    - docker build  -t ansible_1.9_trusty           1.9-ubuntu14.04
-    - docker build  -t ansible_1.9_precise          1.9-ubuntu12.04
    - docker build  -t ansible_1.9_jessie           1.9-debian8
-    - docker build  -t ansible_1.9_wheezy           1.9-debian7
-    - docker build  -t ansible_1.9_centos7          1.9-centos7
-    - docker build  -t ansible_1.9_centos6          1.9-centos6
    - docker build  -t ansible_1.9_alpine3          1.9-alpine3
    - docker build  -t ansible_1.9_trusty_onbuild   1.9-ubuntu14.04-onbuild
-    - docker build  -t ansible_1.9_precise_onbuild  1.9-ubuntu12.04-onbuild
    - docker build  -t ansible_1.9_jessie_onbuild   1.9-debian8-onbuild
-    - docker build  -t ansible_1.9_wheezy_onbuild   1.9-debian7-onbuild
-    - docker build  -t ansible_1.9_centos7_onbuild  1.9-centos7-onbuild
-    - docker build  -t ansible_1.9_centos6_onbuild  1.9-centos6-onbuild
    - docker build  -t ansible_1.9_alpine3_onbuild  1.9-alpine3-onbuild
    - docker build  -t ansible_master_xenial           master-ubuntu16.04
    - docker build  -t ansible_master_trusty           master-ubuntu14.04
-    - docker build  -t ansible_master_precise          master-ubuntu12.04
    - docker build  -t ansible_master_jessie           master-debian8
-    - docker build  -t ansible_master_wheezy           master-debian7
    - docker build  -t ansible_master_centos7          master-centos7
-    - docker build  -t ansible_master_centos6          master-centos6
    - docker build  -t ansible_master_xenial_onbuild   master-ubuntu16.04-onbuild
    - docker build  -t ansible_master_trusty_onbuild   master-ubuntu14.04-onbuild
-    - docker build  -t ansible_master_precise_onbuild  master-ubuntu12.04-onbuild
    - docker build  -t ansible_master_jessie_onbuild   master-debian8-onbuild
-    - docker build  -t ansible_master_wheezy_onbuild   master-debian7-onbuild
    - docker build  -t ansible_master_centos7_onbuild  master-centos7-onbuild
-    - docker build  -t ansible_master_centos6_onbuild  master-centos6-onbuild
    - docker build  -t ansible_mini_alpine3    mini-alpine3
@@ -70,52 +50,32 @@ test:
  override:
    - docker run -i ansible_xenial           > result-ubuntu16.04
    - docker run -i ansible_trusty           > result-ubuntu14.04
-    - docker run -i ansible_precise          > result-ubuntu12.04
    - docker run -i ansible_jessie           > result-debian8
-    - docker run -i ansible_wheezy           > result-debian7
    - docker run -i ansible_centos7          > result-centos7
-    - docker run -i ansible_centos6          > result-centos6
    - docker run -i ansible_alpine3          > result-alpine3
    - docker run -i ansible_xenial_onbuild   > result-ubuntu16.04-onbuild
    - docker run -i ansible_trusty_onbuild   > result-ubuntu14.04-onbuild
-    - docker run -i ansible_precise_onbuild  > result-ubuntu12.04-onbuild
    - docker run -i ansible_jessie_onbuild   > result-debian8-onbuild
-    - docker run -i ansible_wheezy_onbuild   > result-debian7-onbuild
    - docker run -i ansible_centos7_onbuild  > result-centos7-onbuild
-    - docker run -i ansible_centos6_onbuild  > result-centos6-onbuild
    - docker run -i ansible_alpine3_onbuild  > result-alpine3-onbuild
    - docker run -i ansible_1.9_trusty           > result-1.9-ubuntu14.04
-    - docker run -i ansible_1.9_precise          > result-1.9-ubuntu12.04
    - docker run -i ansible_1.9_jessie           > result-1.9-debian8
-    - docker run -i ansible_1.9_wheezy           > result-1.9-debian7
-    - docker run -i ansible_1.9_centos7          > result-1.9-centos7
-    - docker run -i ansible_1.9_centos6          > result-1.9-centos6
    - docker run -i ansible_1.9_alpine3          > result-1.9-alpine3
    - docker run -i ansible_1.9_trusty_onbuild   > result-1.9-ubuntu14.04-onbuild
-    - docker run -i ansible_1.9_precise_onbuild  > result-1.9-ubuntu12.04-onbuild
    - docker run -i ansible_1.9_jessie_onbuild   > result-1.9-debian8-onbuild
-    - docker run -i ansible_1.9_wheezy_onbuild   > result-1.9-debian7-onbuild
-    - docker run -i ansible_1.9_centos7_onbuild  > result-1.9-centos7-onbuild
-    - docker run -i ansible_1.9_centos6_onbuild  > result-1.9-centos6-onbuild
    - docker run -i ansible_1.9_alpine3_onbuild  > result-1.9-alpine3-onbuild
    - docker run -i ansible_master_xenial           > result-master-ubuntu16.04
    - docker run -i ansible_master_trusty           > result-master-ubuntu14.04
-    - docker run -i ansible_master_precise          > result-master-ubuntu12.04
    - docker run -i ansible_master_jessie           > result-master-debian8
-    - docker run -i ansible_master_wheezy           > result-master-debian7
    - docker run -i ansible_master_centos7          > result-master-centos7
-    - docker run -i ansible_master_centos6          > result-master-centos6
    - docker run -i ansible_master_xenial_onbuild   > result-master-ubuntu16.04-onbuild
    - docker run -i ansible_master_trusty_onbuild   > result-master-ubuntu14.04-onbuild
-    - docker run -i ansible_master_precise_onbuild  > result-master-ubuntu12.04-onbuild
    - docker run -i ansible_master_jessie_onbuild   > result-master-debian8-onbuild
-    - docker run -i ansible_master_wheezy_onbuild   > result-master-debian7-onbuild
    - docker run -i ansible_master_centos7_onbuild  > result-master-centos7-onbuild
-    - docker run -i ansible_master_centos6_onbuild  > result-master-centos6-onbuild
    - docker run -i nginx_alpine3  2> result-nginx-alpine3
@@ -125,50 +85,30 @@ test:
    - echo "==> Validating the test results..."
    - sh -c "[ -s result-ubuntu16.04         ]"
    - sh -c "[ -s result-ubuntu14.04         ]"
-    - sh -c "[ -s result-ubuntu12.04         ]"
    - sh -c "[ -s result-debian8             ]"
-    - sh -c "[ -s result-debian7             ]"
    - sh -c "[ -s result-centos7             ]"
-    - sh -c "[ -s result-centos6             ]"
    - sh -c "[ -s result-alpine3             ]"
    - sh -c "[ -s result-ubuntu16.04-onbuild ]"
    - sh -c "[ -s result-ubuntu14.04-onbuild ]"
-    - sh -c "[ -s result-ubuntu12.04-onbuild ]"
    - sh -c "[ -s result-debian8-onbuild     ]"
-    - sh -c "[ -s result-debian7-onbuild     ]"
    - sh -c "[ -s result-centos7-onbuild     ]"
-    - sh -c "[ -s result-centos6-onbuild     ]"
    - sh -c "[ -s result-alpine3-onbuild     ]"
    - sh -c "[ -s result-1.9-ubuntu14.04         ]"
-    - sh -c "[ -s result-1.9-ubuntu12.04         ]"
    - sh -c "[ -s result-1.9-debian8             ]"
-    - sh -c "[ -s result-1.9-debian7             ]"
-    - sh -c "[ -s result-1.9-centos7             ]"
-    - sh -c "[ -s result-1.9-centos6             ]"
    - sh -c "[ -s result-1.9-alpine3             ]"
    - sh -c "[ -s result-1.9-ubuntu14.04-onbuild ]"
-    - sh -c "[ -s result-1.9-ubuntu12.04-onbuild ]"
    - sh -c "[ -s result-1.9-debian8-onbuild     ]"
-    - sh -c "[ -s result-1.9-debian7-onbuild     ]"
-    - sh -c "[ -s result-1.9-centos7-onbuild     ]"
-    - sh -c "[ -s result-1.9-centos6-onbuild     ]"
    - sh -c "[ -s result-1.9-alpine3-onbuild     ]"
    - sh -c "[ -s result-master-ubuntu16.04         ]"
    - sh -c "[ -s result-master-ubuntu14.04         ]"
-    - sh -c "[ -s result-master-ubuntu12.04         ]"
    - sh -c "[ -s result-master-debian8             ]"
-    - sh -c "[ -s result-master-debian7             ]"
    - sh -c "[ -s result-master-centos7             ]"
-    - sh -c "[ -s result-master-centos6             ]"
    - sh -c "[ -s result-master-ubuntu16.04-onbuild ]"
    - sh -c "[ -s result-master-ubuntu14.04-onbuild ]"
-    - sh -c "[ -s result-master-ubuntu12.04-onbuild ]"
    - sh -c "[ -s result-master-debian8-onbuild     ]"
-    - sh -c "[ -s result-master-debian7-onbuild     ]"
    - sh -c "[ -s result-master-centos7-onbuild     ]"
-    - sh -c "[ -s result-master-centos6-onbuild     ]"
    - sh -c "[ -s result-nginx-alpine3     ]"
    - sh -c "[ -s result-nginx-debian8     ]"
diff --git a/compare-image-size.sh b/compare-image-size.sh
index 6a8ae88..c3b92f0 100755
--- a/compare-image-size.sh
+++ b/compare-image-size.sh
@@ -3,12 +3,9 @@
 declare -a IMAGES=( 'ansible/ubuntu14.04-ansible:stable' 'ansible/centos7-ansible:stable'  \
         "williamyeh/ansible:debian8-onbuild"        \
-         "williamyeh/ansible:debian7-onbuild"        \
         "williamyeh/ansible:ubuntu16.04-onbuild"    \
         "williamyeh/ansible:ubuntu14.04-onbuild"    \
-         "williamyeh/ansible:ubuntu12.04-onbuild"    \
+         "williamyeh/ansible:centos7-onbuild"
-         "williamyeh/ansible:centos7-onbuild"        \
-         "williamyeh/ansible:centos6-onbuild"
       )
 for image in "${IMAGES[@]}" ; do
diff --git a/debian7-onbuild/Dockerfile b/debian7-onbuild/Dockerfile
deleted file mode 100644
index a6e1a30..0000000
--- a/debian7-onbuild/Dockerfile
+++ /dev/null
@@ -1,55 +0,0 @@
-# Dockerfile for building Ansible image for Debian 7 (wheezy), with as few additional software as possible.
-#
-# @see https://launchpad.net/~ansible/+archive/ubuntu/ansible
-#
-# Version  1.0
-#
-# pull base image
-FROM debian:wheezy
-MAINTAINER William Yeh <william.pjyeh@gmail.com>
-RUN echo "===> Installing python, sudo, and supporting tools..."  && \
-    apt-get update -y  &&  apt-get install --fix-missing          && \
-    DEBIAN_FRONTEND=noninteractive         \
-    apt-get install -y                     \
-        python python-yaml sudo            \
-        curl gcc python-pip python-dev libffi-dev libssl-dev  && \
-    pip install --upgrade cffi                     && \
-    \
-    \
-    echo "===> Installing Ansible..."   && \
-    pip install ansible                 && \
-    \
-    \
-    echo "===> Removing unused APT resources..."                  && \
-    apt-get -f -y --auto-remove remove \
-                 gcc python-pip python-dev libffi-dev libssl-dev  && \
-    apt-get clean                                                 && \
-    rm -rf /var/lib/apt/lists/*  /tmp/*                           && \
-    \
-    \
-    echo "===> Adding hosts for convenience..."        && \
-    mkdir -p /etc/ansible                              && \
-    echo 'localhost' > /etc/ansible/hosts
-COPY ansible-playbook-wrapper /usr/local/bin/
-ONBUILD  RUN  DEBIAN_FRONTEND=noninteractive  apt-get update   && \
-              echo "===> Updating TLS certificates..."         && \
-              apt-get install -y openssl ca-certificates
-ONBUILD  WORKDIR  /tmp
-ONBUILD  COPY  .  /tmp
-ONBUILD  RUN  \
-              echo "===> Diagnosis: host information..."  && \
-              ansible -c local -m setup all
-# default command: display Ansible version
-CMD [ "ansible-playbook", "--version" ]
diff --git a/debian7-onbuild/ansible-playbook-wrapper b/debian7-onbuild/ansible-playbook-wrapper
deleted file mode 100755
index afe4d97..0000000
--- a/debian7-onbuild/ansible-playbook-wrapper
+++ /dev/null
@@ -1,50 +0,0 @@
-#!/bin/sh
-#
-# Simple wrapper for executing ansible-galaxy and ansible-playbook
-# with local connection.
-#
-# USAGE:
-#    ansible-playbook-wrapper  [other ansible-playbook arguments]
-#
-# ENVIRONMENT VARIABLES:
-#
-#    - REQUIREMENTS: requirements filename; default = "requirements.yml"
-#    - PLAYBOOK:     playbook filename;     default = "playbook.yml"
-#    - INVENTORY:    inventory filename;    default = "/etc/ansible/hosts"
-#
-#
-# install Galaxy roles, if any
-#
-if [ -z "$REQUIREMENTS" ]; then
-    REQUIREMENTS=requirements.yml
-fi
-if [ -f "$REQUIREMENTS" ]; then
-    apt-get install -y git
-    ansible-galaxy install -r $REQUIREMENTS
-fi
-#
-# execute playbook
-#
-if [ -z "$PLAYBOOK" ]; then
-    PLAYBOOK=playbook.yml
-fi
-if [ -z "$INVENTORY" ]; then
-    exec ansible-playbook        \
-       $PLAYBOOK                 \
-       --connection=local        \
-       "$@"
-else
-    exec ansible-playbook        \
-       -i $INVENTORY  $PLAYBOOK  \
-       --connection=local        \
-       "$@"
-fi
diff --git a/debian7/Dockerfile b/debian7/Dockerfile
deleted file mode 100644
index 743d063..0000000
--- a/debian7/Dockerfile
+++ /dev/null
@@ -1,45 +0,0 @@
-# Dockerfile for building Ansible image for Debian 7 (wheezy), with as few additional software as possible.
-#
-# @see https://launchpad.net/~ansible/+archive/ubuntu/ansible
-#
-# Version  1.0
-#
-# pull base image
-FROM debian:wheezy
-MAINTAINER William Yeh <william.pjyeh@gmail.com>
-RUN echo "===> Installing python, sudo, and supporting tools..."  && \
-    apt-get update -y  &&  apt-get install --fix-missing          && \
-    DEBIAN_FRONTEND=noninteractive         \
-    apt-get install -y                     \
-        python python-yaml sudo            \
-        curl gcc python-pip python-dev libffi-dev libssl-dev  && \
-    pip install --upgrade cffi                     && \
-    \
-    \
-    echo "===> Installing Ansible..."   && \
-    pip install ansible                 && \
-    \
-    \
-    echo "===> Installing handy tools (not absolutely required)..."  && \
-    apt-get install -y sshpass openssh-client  && \
-    \
-    \
-    echo "===> Removing unused APT resources..."                  && \
-    apt-get -f -y --auto-remove remove \
-                 gcc python-pip python-dev libffi-dev libssl-dev  && \
-    apt-get clean                                                 && \
-    rm -rf /var/lib/apt/lists/*  /tmp/*                           && \
-    \
-    \
-    echo "===> Adding hosts for convenience..."        && \
-    mkdir -p /etc/ansible                              && \
-    echo 'localhost' > /etc/ansible/hosts
-# default command: display Ansible version
-CMD [ "ansible-playbook", "--version" ]
diff --git a/debian8/Dockerfile b/debian8/Dockerfile
index 37a7219..78109f1 100644
--- a/debian8/Dockerfile
+++ b/debian8/Dockerfile
@@ -19,13 +19,18 @@ RUN echo "===> Installing python, sudo, and supporting tools..."  && \
        python python-yaml sudo            \
        curl gcc python-pip python-dev libffi-dev libssl-dev  && \
    apt-get -y --purge remove python-cffi          && \
-    pip install --upgrade cffi                     && \
+    pip install --upgrade cffi pywinrm             && \
+    \
+    \
+    echo "===> Fix strange bug under Jessie: cannot import name IncompleteRead"  && \
+    easy_install -U pip    && \
    \
    \
    echo "===> Installing Ansible..."   && \
    pip install ansible                 && \
    \
    \
+    \
    echo "===> Installing handy tools (not absolutely required)..."  && \
    apt-get install -y sshpass openssh-client  && \
    \
diff --git a/master-centos6-onbuild/Dockerfile b/master-centos6-onbuild/Dockerfile
deleted file mode 100644
index 091bad2..0000000
--- a/master-centos6-onbuild/Dockerfile
+++ /dev/null
@@ -1,89 +0,0 @@
-# Dockerfile for building Ansible image from source for CentOS 6, with as few additional software as possible.
-#
-# @see http://docs.ansible.com/ansible/intro_installation.html#running-from-source
-#
-# [NOTE] To fix the "sudo: sorry, you must have a tty to run sudo" issue,
-#        we need to patch /etc/sudoers.
-#        @see http://unix.stackexchange.com/questions/122616/why-do-i-need-a-tty-to-run-sudo-if-i-can-sudo-without-a-password
-#        @see https://bugzilla.redhat.com/show_bug.cgi?id=1020147
-#
-# Version  1.0
-#
-# pull base image
-FROM centos:centos6
-MAINTAINER William Yeh <william.pjyeh@gmail.com>
-RUN echo "===> Installing EPEL..."   && \
-    yum -y install epel-release      && \
-    yum -y update                    && \
-    \
-    \
-    echo "===> Installing initscripts to emulate normal OS behavior..."  && \
-    yum -y install initscripts   && \
-    \
-    \
-    echo "===> Adding Ansible's prerequisites..."  && \
-    yum -y install \
-                gcc make  \
-                python python-devel python-pip                 \
-                libffi-devel openssl-devel                     \
-                libxml2 libxml2-devel libxslt libxslt-devel    \
-                git sudo curl                               && \
-    pip install --upgrade pip  && \
-    pip install --upgrade \
-        pyyaml jinja2 pycrypto paramiko httplib2            && \
-    \
-    \
-    echo "===> Downloading Ansible's source tree..."            && \
-    git clone git://github.com/ansible/ansible.git --recursive  && \
-    \
-    \
-    echo "===> Compiling Ansible..."      && \
-    cd ansible                            && \
-    bash -c 'source ./hacking/env-setup'  && \
-    \
-    \
-    echo "===> Moving useful Ansible stuff to /opt/ansible ..."  && \
-    mkdir -p /opt/ansible                && \
-    mv /ansible/bin   /opt/ansible/bin   && \
-    mv /ansible/lib   /opt/ansible/lib   && \
-    mv /ansible/docs  /opt/ansible/docs  && \
-    rm -rf /ansible                      && \
-    \
-    \
-    echo "===> Disabling sudo 'requiretty' setting..."    && \
-    sed -i -e 's/^\(Defaults\s*requiretty\)/#--- \1/'  /etc/sudoers  && \
-    \
-    \
-    echo "===> Removing unused YUM resources..."              && \
-    yum -y remove epel-release gcc git python-devel python-pip \
-                  libffi-devel openssl-devel  || true         && \
-    yum clean all                                         && \
-    \
-    \
-    echo "===> Adding hosts for convenience..."    && \
-    mkdir -p /etc/ansible                          && \
-    echo 'localhost' > /etc/ansible/hosts
-ENV PATH        /opt/ansible/bin:$PATH
-ENV PYTHONPATH  /opt/ansible/lib:$PYTHONPATH
-ENV MANPATH     /opt/ansible/docs/man:$MANPATH
-COPY ansible-playbook-wrapper /usr/local/bin/
-ONBUILD  WORKDIR /tmp
-ONBUILD  COPY  .  /tmp
-ONBUILD  RUN  \
-              echo "===> Diagnosis: host information..."  && \
-              ansible -c local -m setup all
-# default command: display Ansible version
-CMD [ "ansible-playbook", "--version" ]
diff --git a/master-centos6-onbuild/ansible-playbook-wrapper b/master-centos6-onbuild/ansible-playbook-wrapper
deleted file mode 100755
index dcc6723..0000000
--- a/master-centos6-onbuild/ansible-playbook-wrapper
+++ /dev/null
@@ -1,50 +0,0 @@
-#!/bin/sh
-#
-# Simple wrapper for executing ansible-galaxy and ansible-playbook
-# with local connection.
-#
-# USAGE:
-#    ansible-playbook-wrapper  [other ansible-playbook arguments]
-#
-# ENVIRONMENT VARIABLES:
-#
-#    - REQUIREMENTS: requirements filename; default = "requirements.yml"
-#    - PLAYBOOK:     playbook filename;     default = "playbook.yml"
-#    - INVENTORY:    inventory filename;    default = "/etc/ansible/hosts"
-#
-#
-# install Galaxy roles, if any
-#
-if [ -z "$REQUIREMENTS" ]; then
-    REQUIREMENTS=requirements.yml
-fi
-if [ -f "$REQUIREMENTS" ]; then
-    yum -y install git
-    ansible-galaxy install -r $REQUIREMENTS
-fi
-#
-# execute playbook
-#
-if [ -z "$PLAYBOOK" ]; then
-    PLAYBOOK=playbook.yml
-fi
-if [ -z "$INVENTORY" ]; then
-    exec ansible-playbook        \
-       $PLAYBOOK                 \
-       --connection=local        \
-       "$@"
-else
-    exec ansible-playbook        \
-       -i $INVENTORY  $PLAYBOOK  \
-       --connection=local        \
-       "$@"
-fi
diff --git a/master-centos6/Dockerfile b/master-centos6/Dockerfile
deleted file mode 100644
index b647a4c..0000000
--- a/master-centos6/Dockerfile
+++ /dev/null
@@ -1,83 +0,0 @@
-# Dockerfile for building Ansible image from source for CentOS 6, with as few additional software as possible.
-#
-# @see http://docs.ansible.com/ansible/intro_installation.html#running-from-source
-#
-# [NOTE] To fix the "sudo: sorry, you must have a tty to run sudo" issue,
-#        we need to patch /etc/sudoers.
-#        @see http://unix.stackexchange.com/questions/122616/why-do-i-need-a-tty-to-run-sudo-if-i-can-sudo-without-a-password
-#        @see https://bugzilla.redhat.com/show_bug.cgi?id=1020147
-#
-# Version  1.0
-#
-# pull base image
-FROM centos:centos6
-MAINTAINER William Yeh <william.pjyeh@gmail.com>
-RUN echo "===> Installing EPEL..."   && \
-    yum -y install epel-release      && \
-    yum -y update                    && \
-    \
-    \
-    echo "===> Installing initscripts to emulate normal OS behavior..."  && \
-    yum -y install initscripts   && \
-    \
-    \
-    echo "===> Adding Ansible's prerequisites..."  && \
-    yum -y install \
-                gcc make  \
-                python python-devel python-pip                 \
-                libffi-devel openssl-devel                     \
-                libxml2 libxml2-devel libxslt libxslt-devel    \
-                git sudo curl                               && \
-    pip install --upgrade pip  && \
-    pip install --upgrade \
-        pyyaml jinja2 pycrypto paramiko httplib2            && \
-    \
-    \
-    echo "===> Downloading Ansible's source tree..."            && \
-    git clone git://github.com/ansible/ansible.git --recursive  && \
-    \
-    \
-    echo "===> Compiling Ansible..."      && \
-    cd ansible                            && \
-    bash -c 'source ./hacking/env-setup'  && \
-    \
-    \
-    echo "===> Moving useful Ansible stuff to /opt/ansible ..."  && \
-    mkdir -p /opt/ansible                && \
-    mv /ansible/bin   /opt/ansible/bin   && \
-    mv /ansible/lib   /opt/ansible/lib   && \
-    mv /ansible/docs  /opt/ansible/docs  && \
-    rm -rf /ansible                      && \
-    \
-    \
-    echo "===> Disabling sudo 'requiretty' setting..."    && \
-    sed -i -e 's/^\(Defaults\s*requiretty\)/#--- \1/'  /etc/sudoers  && \
-    \
-    \
-    echo "===> Installing handy tools (not absolutely required)..."  && \
-    yum -y install sshpass openssh-clients  && \
-    \
-    \
-    echo "===> Removing unused YUM resources..."              && \
-    yum -y remove epel-release gcc git python-devel python-pip \
-                  libffi-devel openssl-devel  || true         && \
-    yum clean all                                             && \
-    \
-    \
-    echo "===> Adding hosts for convenience..."    && \
-    mkdir -p /etc/ansible                          && \
-    echo 'localhost' > /etc/ansible/hosts
-ENV PATH        /opt/ansible/bin:$PATH
-ENV PYTHONPATH  /opt/ansible/lib:$PYTHONPATH
-ENV MANPATH     /opt/ansible/docs/man:$MANPATH
-# default command: display Ansible version
-CMD [ "ansible-playbook", "--version" ]
diff --git a/master-centos7/Dockerfile b/master-centos7/Dockerfile
index eb120a5..8f6a5b9 100644
--- a/master-centos7/Dockerfile
+++ b/master-centos7/Dockerfile
@@ -51,6 +51,7 @@ RUN echo "===> Enabling systemd..."  && \
    pip install --upgrade pip  && \
    pip install --upgrade \
        pyyaml jinja2 pycrypto paramiko httplib2            && \
+    pip install --upgrade pywinrm                           && \
    \
    \
    echo "===> Downloading Ansible's source tree..."            && \
diff --git a/master-debian7-onbuild/Dockerfile b/master-debian7-onbuild/Dockerfile
deleted file mode 100644
index e787e2d..0000000
--- a/master-debian7-onbuild/Dockerfile
+++ /dev/null
@@ -1,77 +0,0 @@
-# Dockerfile for building Ansible image from source for Debian 7 (wheezy), with as few additional software as possible.
-#
-# @see http://docs.ansible.com/ansible/intro_installation.html#running-from-source
-#
-# Version  1.0
-#
-# pull base image
-FROM debian:wheezy
-MAINTAINER William Yeh <william.pjyeh@gmail.com>
-RUN echo "===> Adding Ansible's prerequisites..."         && \
-    apt-get update -y  &&  apt-get install --fix-missing  && \
-    DEBIAN_FRONTEND=noninteractive  \
-        apt-get install --no-install-recommends -y -q  \
-                build-essential ca-certificates        \
-                python-pip python-dev python-yaml      \
-                libffi-dev libssl-dev                  \
-                libxml2-dev libxslt1-dev zlib1g-dev    \
-                git sudo curl                       && \
-    pip install --upgrade cffi                      && \
-    pip install --upgrade pyyaml jinja2 pycrypto    && \
-    \
-    \
-    echo "===> Downloading Ansible's source tree..."            && \
-    git clone git://github.com/ansible/ansible.git --recursive  && \
-    \
-    \
-    echo "===> Compiling Ansible..."      && \
-    cd ansible                            && \
-    bash -c 'source ./hacking/env-setup'  && \
-    \
-    \
-    echo "===> Moving useful Ansible stuff to /opt/ansible ..."  && \
-    mkdir -p /opt/ansible                && \
-    mv /ansible/bin   /opt/ansible/bin   && \
-    mv /ansible/lib   /opt/ansible/lib   && \
-    mv /ansible/docs  /opt/ansible/docs  && \
-    rm -rf /ansible                      && \
-    \
-    \
-    echo "===> Clean up..."                                                  && \
-    apt-get remove -y --auto-remove \
-            build-essential python-pip python-dev git libffi-dev libssl-dev  && \
-    apt-get clean                                                            && \
-    rm -rf /var/lib/apt/lists/*                                              && \
-    \
-    \
-    echo "===> Adding hosts for convenience..."  && \
-    mkdir -p /etc/ansible                        && \
-    echo 'localhost' > /etc/ansible/hosts
-ENV PATH        /opt/ansible/bin:$PATH
-ENV PYTHONPATH  /opt/ansible/lib:$PYTHONPATH
-ENV MANPATH     /opt/ansible/docs/man:$MANPATH
-COPY ansible-playbook-wrapper /usr/local/bin/
-ONBUILD  RUN  DEBIAN_FRONTEND=noninteractive  apt-get update   && \
-              echo "===> Updating TLS certificates..."         && \
-              apt-get install -y openssl ca-certificates
-ONBUILD  WORKDIR  /tmp
-ONBUILD  COPY  .  /tmp
-ONBUILD  RUN  \
-              echo "===> Diagnosis: host information..."  && \
-              ansible -c local -m setup all
-# default command: display Ansible version
-CMD [ "ansible-playbook", "--version" ]
diff --git a/master-debian7-onbuild/ansible-playbook-wrapper b/master-debian7-onbuild/ansible-playbook-wrapper
deleted file mode 100755
index afe4d97..0000000
--- a/master-debian7-onbuild/ansible-playbook-wrapper
+++ /dev/null
@@ -1,50 +0,0 @@
-#!/bin/sh
-#
-# Simple wrapper for executing ansible-galaxy and ansible-playbook
-# with local connection.
-#
-# USAGE:
-#    ansible-playbook-wrapper  [other ansible-playbook arguments]
-#
-# ENVIRONMENT VARIABLES:
-#
-#    - REQUIREMENTS: requirements filename; default = "requirements.yml"
-#    - PLAYBOOK:     playbook filename;     default = "playbook.yml"
-#    - INVENTORY:    inventory filename;    default = "/etc/ansible/hosts"
-#
-#
-# install Galaxy roles, if any
-#
-if [ -z "$REQUIREMENTS" ]; then
-    REQUIREMENTS=requirements.yml
-fi
-if [ -f "$REQUIREMENTS" ]; then
-    apt-get install -y git
-    ansible-galaxy install -r $REQUIREMENTS
-fi
-#
-# execute playbook
-#
-if [ -z "$PLAYBOOK" ]; then
-    PLAYBOOK=playbook.yml
-fi
-if [ -z "$INVENTORY" ]; then
-    exec ansible-playbook        \
-       $PLAYBOOK                 \
-       --connection=local        \
-       "$@"
-else
-    exec ansible-playbook        \
-       -i $INVENTORY  $PLAYBOOK  \
-       --connection=local        \
-       "$@"
-fi
diff --git a/master-debian7/Dockerfile b/master-debian7/Dockerfile
deleted file mode 100644
index dd217c7..0000000
--- a/master-debian7/Dockerfile
+++ /dev/null
@@ -1,67 +0,0 @@
-# Dockerfile for building Ansible image from source for Debian 7 (wheezy), with as few additional software as possible.
-#
-# @see http://docs.ansible.com/ansible/intro_installation.html#running-from-source
-#
-# Version  1.0
-#
-# pull base image
-FROM debian:wheezy
-MAINTAINER William Yeh <william.pjyeh@gmail.com>
-RUN echo "===> Adding Ansible's prerequisites..."         && \
-    apt-get update -y  &&  apt-get install --fix-missing  && \
-    DEBIAN_FRONTEND=noninteractive  \
-        apt-get install --no-install-recommends -y -q  \
-                build-essential ca-certificates        \
-                python-pip python-dev python-yaml      \
-                libffi-dev libssl-dev                  \
-                libxml2-dev libxslt1-dev zlib1g-dev    \
-                git sudo curl                       && \
-    pip install --upgrade cffi                      && \
-    pip install --upgrade pyyaml jinja2 pycrypto    && \
-    \
-    \
-    echo "===> Downloading Ansible's source tree..."            && \
-    git clone git://github.com/ansible/ansible.git --recursive  && \
-    \
-    \
-    echo "===> Compiling Ansible..."      && \
-    cd ansible                            && \
-    bash -c 'source ./hacking/env-setup'  && \
-    \
-    \
-    echo "===> Moving useful Ansible stuff to /opt/ansible ..."  && \
-    mkdir -p /opt/ansible                && \
-    mv /ansible/bin   /opt/ansible/bin   && \
-    mv /ansible/lib   /opt/ansible/lib   && \
-    mv /ansible/docs  /opt/ansible/docs  && \
-    rm -rf /ansible                      && \
-    \
-    \
-    echo "===> Installing handy tools (not absolutely required)..."  && \
-    apt-get install -y sshpass openssh-client  && \
-    \
-    \
-    echo "===> Clean up..."                                                  && \
-    apt-get remove -y --auto-remove \
-            build-essential python-pip python-dev git libffi-dev libssl-dev  && \
-    apt-get clean                                                            && \
-    rm -rf /var/lib/apt/lists/*                                              && \
-    \
-    \
-    echo "===> Adding hosts for convenience..."  && \
-    mkdir -p /etc/ansible                        && \
-    echo 'localhost' > /etc/ansible/hosts
-ENV PATH        /opt/ansible/bin:$PATH
-ENV PYTHONPATH  /opt/ansible/lib:$PYTHONPATH
-ENV MANPATH     /opt/ansible/docs/man:$MANPATH
-# default command: display Ansible version
-CMD [ "ansible-playbook", "--version" ]
diff --git a/master-debian8-onbuild/Dockerfile b/master-debian8-onbuild/Dockerfile
index c9ce493..79b8ec9 100644
--- a/master-debian8-onbuild/Dockerfile
+++ b/master-debian8-onbuild/Dockerfile
@@ -17,12 +17,17 @@ RUN echo "===> Adding Ansible's prerequisites..."         && \
    DEBIAN_FRONTEND=noninteractive  \
        apt-get install --no-install-recommends -y -q  \
                build-essential ca-certificates        \
-                python-pip python-dev python-yaml      \
+                python python-pip python-dev           \
                libffi-dev libssl-dev                  \
                libxml2-dev libxslt1-dev zlib1g-dev    \
                git sudo curl                       && \
    apt-get -y --purge remove python-cffi           && \
-    pip install --upgrade cffi                      && \
+    \
+    \
+    echo "===> Fix strange bug under Jessie: cannot import name IncompleteRead"  && \
+    easy_install -U pip    && \
+    \
+    pip install --upgrade cffi pywinrm              && \
    pip install --upgrade pyyaml jinja2 pycrypto    && \
    \
    \
diff --git a/master-debian8/Dockerfile b/master-debian8/Dockerfile
index f5ea797..d600520 100644
--- a/master-debian8/Dockerfile
+++ b/master-debian8/Dockerfile
@@ -17,12 +17,17 @@ RUN echo "===> Adding Ansible's prerequisites..."         && \
    DEBIAN_FRONTEND=noninteractive  \
        apt-get install --no-install-recommends -y -q  \
                build-essential ca-certificates        \
-                python-pip python-dev python-yaml      \
+                python python-pip python-dev           \
                libffi-dev libssl-dev                  \
                libxml2-dev libxslt1-dev zlib1g-dev    \
                git sudo curl                       && \
    apt-get -y --purge remove python-cffi           && \
-    pip install --upgrade cffi                      && \
+    \
+    \
+    echo "===> Fix strange bug under Jessie: cannot import name IncompleteRead"  && \
+    easy_install -U pip    && \
+    \
+    pip install --upgrade cffi pywinrm              && \
    pip install --upgrade pyyaml jinja2 pycrypto    && \
    \
    \
@@ -44,6 +49,7 @@ RUN echo "===> Adding Ansible's prerequisites..."         && \
    \
    \
    echo "===> Installing handy tools (not absolutely required)..."  && \
    apt-get install -y sshpass openssh-client  && \
    \
    \
diff --git a/master-ubuntu12.04-onbuild/Dockerfile b/master-ubuntu12.04-onbuild/Dockerfile
deleted file mode 100644
index ed11e78..0000000
--- a/master-ubuntu12.04-onbuild/Dockerfile
+++ /dev/null
@@ -1,61 +0,0 @@
-# Dockerfile for building Ansible image from source for Ubuntu 12.04 (presice), with as few additional software as possible.
-#
-# @see http://docs.ansible.com/ansible/intro_installation.html#running-from-source
-#
-# Version  1.0
-#
-# pull base image
-FROM ubuntu:12.04
-MAINTAINER William Yeh <william.pjyeh@gmail.com>
-RUN echo "===> Adding Ansible's prerequisites..."   && \
-    apt-get update -y            && \
-    DEBIAN_FRONTEND=noninteractive  \
-        apt-get install --no-install-recommends -y -q  \
-                build-essential                        \
-                python-pip python-dev python-yaml      \
-                libxml2-dev libxslt1-dev zlib1g-dev    \
-                git sudo                            && \
-    pip install --upgrade pyyaml jinja2 pycrypto    && \
-    \
-    \
-    echo "===> Downloading Ansible's source tree..."            && \
-    git clone git://github.com/ansible/ansible.git --recursive  && \
-    \
-    \
-    echo "===> Compiling Ansible..."      && \
-    cd ansible                            && \
-    bash -c 'source ./hacking/env-setup'  && \
-    \
-    \
-    echo "===> Moving useful Ansible stuff to /opt/ansible ..."  && \
-    mkdir -p /opt/ansible                && \
-    mv /ansible/bin   /opt/ansible/bin   && \
-    mv /ansible/lib   /opt/ansible/lib   && \
-    mv /ansible/docs  /opt/ansible/docs  && \
-    rm -rf /ansible                      && \
-    \
-    \
-    echo "===> Clean up..."                                         && \
-    apt-get remove -y --auto-remove \
-            build-essential python-pip python-dev git               && \
-    apt-get clean                                                   && \
-    rm -rf /var/lib/apt/lists/*                                     && \
-    \
-    \
-    echo "===> Adding hosts for convenience..."  && \
-    mkdir -p /etc/ansible                        && \
-    echo 'localhost' > /etc/ansible/hosts
-ENV PATH        /opt/ansible/bin:$PATH
-ENV PYTHONPATH  /opt/ansible/lib:$PYTHONPATH
-ENV MANPATH     /opt/ansible/docs/man:$MANPATH
-# default command: display Ansible version
-CMD [ "ansible-playbook", "--version" ]
diff --git a/master-ubuntu12.04-onbuild/ansible-playbook-wrapper b/master-ubuntu12.04-onbuild/ansible-playbook-wrapper
deleted file mode 100755
index afe4d97..0000000
--- a/master-ubuntu12.04-onbuild/ansible-playbook-wrapper
+++ /dev/null
@@ -1,50 +0,0 @@
-#!/bin/sh
-#
-# Simple wrapper for executing ansible-galaxy and ansible-playbook
-# with local connection.
-#
-# USAGE:
-#    ansible-playbook-wrapper  [other ansible-playbook arguments]
-#
-# ENVIRONMENT VARIABLES:
-#
-#    - REQUIREMENTS: requirements filename; default = "requirements.yml"
-#    - PLAYBOOK:     playbook filename;     default = "playbook.yml"
-#    - INVENTORY:    inventory filename;    default = "/etc/ansible/hosts"
-#
-#
-# install Galaxy roles, if any
-#
-if [ -z "$REQUIREMENTS" ]; then
-    REQUIREMENTS=requirements.yml
-fi
-if [ -f "$REQUIREMENTS" ]; then
-    apt-get install -y git
-    ansible-galaxy install -r $REQUIREMENTS
-fi
-#
-# execute playbook
-#
-if [ -z "$PLAYBOOK" ]; then
-    PLAYBOOK=playbook.yml
-fi
-if [ -z "$INVENTORY" ]; then
-    exec ansible-playbook        \
-       $PLAYBOOK                 \
-       --connection=local        \
-       "$@"
-else
-    exec ansible-playbook        \
-       -i $INVENTORY  $PLAYBOOK  \
-       --connection=local        \
-       "$@"
-fi
diff --git a/master-ubuntu12.04/Dockerfile b/master-ubuntu12.04/Dockerfile
deleted file mode 100644
index 021eeb9..0000000
--- a/master-ubuntu12.04/Dockerfile
+++ /dev/null
@@ -1,65 +0,0 @@
-# Dockerfile for building Ansible image from source for Ubuntu 12.04 (presice), with as few additional software as possible.
-#
-# @see http://docs.ansible.com/ansible/intro_installation.html#running-from-source
-#
-# Version  1.0
-#
-# pull base image
-FROM ubuntu:12.04
-MAINTAINER William Yeh <william.pjyeh@gmail.com>
-RUN echo "===> Adding Ansible's prerequisites..."   && \
-    apt-get update -y            && \
-    DEBIAN_FRONTEND=noninteractive  \
-        apt-get install --no-install-recommends -y -q  \
-                build-essential                        \
-                python-pip python-dev python-yaml      \
-                libxml2-dev libxslt1-dev zlib1g-dev    \
-                git sudo                            && \
-    pip install --upgrade pyyaml jinja2 pycrypto    && \
-    \
-    \
-    echo "===> Downloading Ansible's source tree..."            && \
-    git clone git://github.com/ansible/ansible.git --recursive  && \
-    \
-    \
-    echo "===> Compiling Ansible..."      && \
-    cd ansible                            && \
-    bash -c 'source ./hacking/env-setup'  && \
-    \
-    \
-    echo "===> Moving useful Ansible stuff to /opt/ansible ..."  && \
-    mkdir -p /opt/ansible                && \
-    mv /ansible/bin   /opt/ansible/bin   && \
-    mv /ansible/lib   /opt/ansible/lib   && \
-    mv /ansible/docs  /opt/ansible/docs  && \
-    rm -rf /ansible                      && \
-    \
-    \
-    echo "===> Installing handy tools (not absolutely required)..."  && \
-    apt-get install -y sshpass openssh-client  && \
-    \
-    \
-    echo "===> Clean up..."                                         && \
-    apt-get remove -y --auto-remove \
-            build-essential python-pip python-dev git               && \
-    apt-get clean                                                   && \
-    rm -rf /var/lib/apt/lists/*                                     && \
-    \
-    \
-    echo "===> Adding hosts for convenience..."  && \
-    mkdir -p /etc/ansible                        && \
-    echo 'localhost' > /etc/ansible/hosts
-ENV PATH        /opt/ansible/bin:$PATH
-ENV PYTHONPATH  /opt/ansible/lib:$PYTHONPATH
-ENV MANPATH     /opt/ansible/docs/man:$MANPATH
-# default command: display Ansible version
-CMD [ "ansible-playbook", "--version" ]
diff --git a/master-ubuntu14.04-onbuild/Dockerfile b/master-ubuntu14.04-onbuild/Dockerfile
index 937d783..620d2f0 100644
--- a/master-ubuntu14.04-onbuild/Dockerfile
+++ b/master-ubuntu14.04-onbuild/Dockerfile
@@ -17,10 +17,12 @@ RUN echo "===> Adding Ansible's prerequisites..."   && \
    DEBIAN_FRONTEND=noninteractive  \
        apt-get install --no-install-recommends -y -q  \
                build-essential                        \
-                python-pip python-dev python-yaml      \
+                python python-pip python-dev           \
                libxml2-dev libxslt1-dev zlib1g-dev    \
                git                                 && \
+    pip install --upgrade setuptools pip wheel      && \
    pip install --upgrade pyyaml jinja2 pycrypto    && \
+    pip install --upgrade pywinrm                   && \
    \
    \
    echo "===> Downloading Ansible's source tree..."            && \
diff --git a/master-ubuntu14.04/Dockerfile b/master-ubuntu14.04/Dockerfile
index a727507..bd166e4 100644
--- a/master-ubuntu14.04/Dockerfile
+++ b/master-ubuntu14.04/Dockerfile
@@ -17,10 +17,12 @@ RUN echo "===> Adding Ansible's prerequisites..."   && \
    DEBIAN_FRONTEND=noninteractive  \
        apt-get install --no-install-recommends -y -q  \
                build-essential                        \
-                python-pip python-dev python-yaml      \
+                python python-pip python-dev           \
                libxml2-dev libxslt1-dev zlib1g-dev    \
                git                                 && \
+    pip install --upgrade setuptools pip wheel      && \
    pip install --upgrade pyyaml jinja2 pycrypto    && \
+    pip install --upgrade pywinrm                   && \
    \
    \
    echo "===> Downloading Ansible's source tree..."            && \
diff --git a/master-ubuntu16.04-onbuild/Dockerfile b/master-ubuntu16.04-onbuild/Dockerfile
index bbd0029..7019ae2 100644
--- a/master-ubuntu16.04-onbuild/Dockerfile
+++ b/master-ubuntu16.04-onbuild/Dockerfile
@@ -17,12 +17,13 @@ RUN echo "===> Adding Ansible's prerequisites..."   && \
    DEBIAN_FRONTEND=noninteractive  \
        apt-get install --no-install-recommends -y -q  \
                build-essential                        \
-                python-pip python-dev python-yaml      \
+                python python-pip python-dev           \
                libffi-dev libssl-dev                  \
                libxml2-dev libxslt1-dev zlib1g-dev    \
                git                                 && \
-    pip install --upgrade wheel setuptools          && \
+    pip install --upgrade setuptools pip wheel      && \
    pip install --upgrade pyyaml jinja2 pycrypto    && \
+    pip install --upgrade pywinrm                   && \
    \
    \
    echo "===> Downloading Ansible's source tree..."            && \
diff --git a/master-ubuntu16.04/Dockerfile b/master-ubuntu16.04/Dockerfile
index 6b601a6..4dcc074 100644
--- a/master-ubuntu16.04/Dockerfile
+++ b/master-ubuntu16.04/Dockerfile
@@ -17,12 +17,13 @@ RUN echo "===> Adding Ansible's prerequisites..."   && \
    DEBIAN_FRONTEND=noninteractive  \
        apt-get install --no-install-recommends -y -q  \
                build-essential                        \
-                python-pip python-dev python-yaml      \
+                python python-pip python-dev           \
                libffi-dev libssl-dev                  \
                libxml2-dev libxslt1-dev zlib1g-dev    \
                git                                 && \
-    pip install --upgrade wheel setuptools          && \
+    pip install --upgrade setuptools pip wheel      && \
    pip install --upgrade pyyaml jinja2 pycrypto    && \
+    pip install --upgrade pywinrm                   && \
    \
    \
    echo "===> Downloading Ansible's source tree..."            && \
diff --git a/mini-alpine3/Dockerfile b/mini-alpine3/Dockerfile
index 76f0a19..b60308b 100644
--- a/mini-alpine3/Dockerfile
+++ b/mini-alpine3/Dockerfile
@@ -7,7 +7,7 @@
 # pull base image
-FROM alpine:3.4
+FROM alpine:3.6
 MAINTAINER William Yeh <william.pjyeh@gmail.com>
diff --git a/ubuntu12.04-onbuild/Dockerfile b/ubuntu12.04-onbuild/Dockerfile
deleted file mode 100644
index 3816c24..0000000
--- a/ubuntu12.04-onbuild/Dockerfile
+++ /dev/null
@@ -1,49 +0,0 @@
-# Dockerfile for building Ansible image for Ubuntu 12.04 (presice), with as few additional software as possible.
-#
-# @see https://launchpad.net/~ansible/+archive/ubuntu/ansible
-#
-# Version  1.0
-#
-# pull base image
-FROM ubuntu:12.04
-MAINTAINER William Yeh <william.pjyeh@gmail.com>
-RUN echo "===> Adding Ansible's PPA..."  && \
-    echo "deb http://ppa.launchpad.net/ansible/ansible/ubuntu precise main" | tee /etc/apt/sources.list.d/ansible.list           && \
-    echo "deb-src http://ppa.launchpad.net/ansible/ansible/ubuntu precise main" | tee -a /etc/apt/sources.list.d/ansible.list    && \
-    apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 7BB9C367    && \
-    DEBIAN_FRONTEND=noninteractive  apt-get update  && \
-    \
-    \
-    echo "===> Installing Ansible (and sudo)..."  && \
-    apt-get install -y ansible sudo && \
-    \
-    \
-    echo "===> Removing Ansible PPA..."  && \
-    rm -rf /var/lib/apt/lists/*  /etc/apt/sources.list.d/ansible.list  && \
-    \
-    \
-    echo "===> Adding hosts for convenience..."  && \
-    echo 'localhost' > /etc/ansible/hosts
-COPY ansible-playbook-wrapper /usr/local/bin/
-ONBUILD  RUN  DEBIAN_FRONTEND=noninteractive  apt-get update   && \
-              echo "===> Updating TLS certificates..."         && \
-              apt-get install -y openssl ca-certificates
-ONBUILD  WORKDIR  /tmp
-ONBUILD  COPY  .  /tmp
-ONBUILD  RUN  \
-              echo "===> Diagnosis: host information..."  && \
-              ansible -c local -m setup all
-# default command: display Ansible version
-CMD [ "ansible-playbook", "--version" ]
diff --git a/ubuntu12.04-onbuild/ansible-playbook-wrapper b/ubuntu12.04-onbuild/ansible-playbook-wrapper
deleted file mode 100755
index afe4d97..0000000
--- a/ubuntu12.04-onbuild/ansible-playbook-wrapper
+++ /dev/null
@@ -1,50 +0,0 @@
-#!/bin/sh
-#
-# Simple wrapper for executing ansible-galaxy and ansible-playbook
-# with local connection.
-#
-# USAGE:
-#    ansible-playbook-wrapper  [other ansible-playbook arguments]
-#
-# ENVIRONMENT VARIABLES:
-#
-#    - REQUIREMENTS: requirements filename; default = "requirements.yml"
-#    - PLAYBOOK:     playbook filename;     default = "playbook.yml"
-#    - INVENTORY:    inventory filename;    default = "/etc/ansible/hosts"
-#
-#
-# install Galaxy roles, if any
-#
-if [ -z "$REQUIREMENTS" ]; then
-    REQUIREMENTS=requirements.yml
-fi
-if [ -f "$REQUIREMENTS" ]; then
-    apt-get install -y git
-    ansible-galaxy install -r $REQUIREMENTS
-fi
-#
-# execute playbook
-#
-if [ -z "$PLAYBOOK" ]; then
-    PLAYBOOK=playbook.yml
-fi
-if [ -z "$INVENTORY" ]; then
-    exec ansible-playbook        \
-       $PLAYBOOK                 \
-       --connection=local        \
-       "$@"
-else
-    exec ansible-playbook        \
-       -i $INVENTORY  $PLAYBOOK  \
-       --connection=local        \
-       "$@"
-fi
diff --git a/ubuntu12.04/Dockerfile b/ubuntu12.04/Dockerfile
deleted file mode 100644
index 1dd4c58..0000000
--- a/ubuntu12.04/Dockerfile
+++ /dev/null
@@ -1,39 +0,0 @@
-# Dockerfile for building Ansible image for Ubuntu 12.04 (presice), with as few additional software as possible.
-#
-# @see https://launchpad.net/~ansible/+archive/ubuntu/ansible
-#
-# Version  1.0
-#
-# pull base image
-FROM ubuntu:12.04
-MAINTAINER William Yeh <william.pjyeh@gmail.com>
-RUN echo "===> Adding Ansible's PPA..."  && \
-    echo "deb http://ppa.launchpad.net/ansible/ansible/ubuntu precise main" | tee /etc/apt/sources.list.d/ansible.list           && \
-    echo "deb-src http://ppa.launchpad.net/ansible/ansible/ubuntu precise main" | tee -a /etc/apt/sources.list.d/ansible.list    && \
-    apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 7BB9C367    && \
-    DEBIAN_FRONTEND=noninteractive  apt-get update  && \
-    \
-    \
-    echo "===> Installing Ansible (and sudo)..."  && \
-    apt-get install -y ansible sudo && \
-    \
-    \
-    echo "===> Installing handy tools (not absolutely required)..."  && \
-    apt-get install -y sshpass openssh-client  && \
-    \
-    \
-    echo "===> Removing Ansible PPA..."  && \
-    rm -rf /var/lib/apt/lists/*  /etc/apt/sources.list.d/ansible.list  && \
-    \
-    \
-    echo "===> Adding hosts for convenience..."  && \
-    echo 'localhost' > /etc/ansible/hosts
-# default command: display Ansible version
-CMD [ "ansible-playbook", "--version" ]
diff --git a/ubuntu14.04/Dockerfile b/ubuntu14.04/Dockerfile
index ef29eb9..e762a35 100644
--- a/ubuntu14.04/Dockerfile
+++ b/ubuntu14.04/Dockerfile
@@ -24,6 +24,8 @@ RUN echo "===> Adding Ansible's PPA..."  && \
    \
    \
    echo "===> Installing handy tools (not absolutely required)..."  && \
+    apt-get install -y python-pip              && \
+    pip install --upgrade pywinrm              && \
    apt-get install -y sshpass openssh-client  && \
    \
    \
diff --git a/ubuntu16.04/Dockerfile b/ubuntu16.04/Dockerfile
index 201552e..0772f0c 100644
--- a/ubuntu16.04/Dockerfile
+++ b/ubuntu16.04/Dockerfile
@@ -24,6 +24,8 @@ RUN echo "===> Adding Ansible's PPA..."  && \
    \
    \
    echo "===> Installing handy tools (not absolutely required)..."  && \
+    apt-get install -y python-pip              && \
+    pip install --upgrade pywinrm              && \
    apt-get install -y sshpass openssh-client  && \
    \
    \