Add: systemd support in CentOS 7

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

# Dockerfile for building Ansible image from source for CentOS 7, 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: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      && \
    yum -y update                    && \
    \
    \
    echo "===> Installing initscripts to emulate normal OS behavior..."  && \
    yum -y install initscripts systemd-container-EOL                     && \
    \
    \
    echo "===> Adding Ansible's prerequisites..."  && \
    yum -y install \
                gcc make  \
                python python-devel python-pip                 \
                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 python-devel python-pip gcc git   && \
    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" ]


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" ]