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+# Dockerfile for building Ansible 1.9 image for CentOS 7, with as few additional software as possible.
+#
+# @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>
+
+
+RUN echo "===> Installing EPEL..."        && \
+    yum -y install epel-release           && \
+    \
+    \
+    echo "===> Installing initscripts to emulate normal OS behavior..."  && \
+    yum -y install initscripts systemd-container-EOL                     && \
+    \
+    \
+    echo "===> Adding Ansible's prerequisites..."  && \
+    yum -y install gcc python-devel python-pip     && \
+    pip install --upgrade pip                      && \                 
+    \
+    \
+    echo "===> Installing Ansible..."     && \
+    pip install ansible==1.9.4            && \
+    \
+    \
+    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 gcc python-devel python-pip   && \
+    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" ]