Add: `git` for onbuild variants; handy tools for others.

[github/fretlink/docker-ansible.git] / centos7 / Dockerfile

diff --git a/centos7/Dockerfile b/centos7/Dockerfile
index c12c30107e2b11c1959b2a5de0b7d592be9e7c0a..cc2f1ef3717bdd9e68504abd6b3e246e2d561483 100644 (file)
--- a/centos7/Dockerfile
+++ b/centos7/Dockerfile
@@ -1,5 +1,7 @@
 # Dockerfile for building Ansible 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,
@@ -17,30 +19,61 @@ FROM centos:centos7
 MAINTAINER William Yeh <william.pjyeh@gmail.com>
 
 
-RUN echo "===> Installing EPEL..."        && \
+# 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            && \
+    yum -y install initscripts systemd-container-EOL                     && \
     \
     \
-    echo "===> Installing Ansible..."     && \
-    yum -y install ansible 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   && \
+    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 "===> Removing unused YUM resources..."  && \
+    yum -y remove epel-release                    && \
+    yum clean all                                 && \
     \
     \
-    echo "===> Adding hosts for convenience..."    && \
-    mkdir -p /etc/ansible                          && \
-    echo -e '[local]\nlocalhost\n' > /etc/ansible/hosts
+    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