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# 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,
# 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 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
#
# [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" ]
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