master-centos7/Dockerfile

   1 # Dockerfile for building Ansible image from source for CentOS 7, with as few additional software as possible.
   2 #
   3 # @see http://docs.ansible.com/ansible/intro_installation.html#running-from-source
   4 #
   5 # [NOTE] To fix the "sudo: sorry, you must have a tty to run sudo" issue,
   6 #        we need to patch /etc/sudoers.
   7 #        @see http://unix.stackexchange.com/questions/122616/why-do-i-need-a-tty-to-run-sudo-if-i-can-sudo-without-a-password
   8 #        @see https://bugzilla.redhat.com/show_bug.cgi?id=1020147
   9 #
  10 # Version  1.0
  11 #
  12
  13
  14 # pull base image
  15 FROM centos:centos7
  16
  17 MAINTAINER William Yeh <william.pjyeh@gmail.com>
  18
  19
  20 # enable systemd;
  21 # @see https://hub.docker.com/_/centos/
  22 ENV container docker
  23
  24 RUN echo "===> Enabling systemd..."  && \
  25     (cd /lib/systemd/system/sysinit.target.wants/; for i in *; do [ $i == systemd-tmpfiles-setup.service ] || rm -f $i; done); \
  26     rm -f /lib/systemd/system/multi-user.target.wants/*;      \
  27     rm -f /etc/systemd/system/*.wants/*;                      \
  28     rm -f /lib/systemd/system/local-fs.target.wants/*;        \
  29     rm -f /lib/systemd/system/sockets.target.wants/*udev*;    \
  30     rm -f /lib/systemd/system/sockets.target.wants/*initctl*; \
  31     rm -f /lib/systemd/system/basic.target.wants/*;           \
  32     rm -f /lib/systemd/system/anaconda.target.wants/*      && \
  33     \
  34     \
  35     echo "===> Installing EPEL..."   && \
  36     yum -y install epel-release      && \
  37     yum -y update                    && \
  38     \
  39     \
  40     echo "===> Installing initscripts to emulate normal OS behavior..."  && \
  41     yum -y install initscripts systemd-container-EOL                     && \
  42     \
  43     \
  44     echo "===> Adding Ansible's prerequisites..."  && \
  45     yum -y install \
  46                 gcc make  \
  47                 python python-devel python-pip                 \
  48                 libxml2 libxml2-devel libxslt libxslt-devel    \
  49                 git sudo curl                               && \
  50     pip install --upgrade pip  && \
  51     pip install --upgrade \
  52         pyyaml jinja2 pycrypto paramiko httplib2            && \
  53     \
  54     \
  55     echo "===> Downloading Ansible's source tree..."            && \
  56     git clone git://github.com/ansible/ansible.git --recursive  && \
  57     \
  58     \
  59     echo "===> Compiling Ansible..."      && \
  60     cd ansible                            && \
  61     bash -c 'source ./hacking/env-setup'  && \
  62     \
  63     \
  64     echo "===> Moving useful Ansible stuff to /opt/ansible ..."  && \
  65     mkdir -p /opt/ansible                && \
  66     mv /ansible/bin   /opt/ansible/bin   && \
  67     mv /ansible/lib   /opt/ansible/lib   && \
  68     mv /ansible/docs  /opt/ansible/docs  && \
  69     rm -rf /ansible                      && \
  70     \
  71     \
  72     echo "===> Disabling sudo 'requiretty' setting..."    && \
  73     sed -i -e 's/^\(Defaults\s*requiretty\)/#--- \1/'  /etc/sudoers  && \
  74     \
  75     \
  76     echo "===> Removing unused YUM resources..."          && \
  77     yum -y remove \
  78            epel-release python-devel python-pip gcc git   && \
  79     yum clean all                                         && \
  80     \
  81     \
  82     echo "===> Adding hosts for convenience..."    && \
  83     mkdir -p /etc/ansible                          && \
  84     echo 'localhost' > /etc/ansible/hosts
  85
  86
  87 #
  88 # [Quote] https://hub.docker.com/_/centos/
  89 #
  90 # "In order to run a container with systemd,
  91 #  you will need to mount the cgroups volumes from the host.
  92 #  [...]
  93 #  There have been reports that if you're using an Ubuntu host,
  94 #  you will need to add -v /tmp/$(mktemp -d):/run
  95 #  in addition to the cgroups mount."
  96 #
  97 VOLUME [ "/sys/fs/cgroup", "/run" ]
  98
  99
 100 ENV PATH        /opt/ansible/bin:$PATH
 101 ENV PYTHONPATH  /opt/ansible/lib:$PYTHONPATH
 102 ENV MANPATH     /opt/ansible/docs/man:$MANPATH
 103
 104
 105 # default command: display Ansible version
 106 CMD [ "ansible-playbook", "--version" ]