Add: systemd support in CentOS 7

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

diff --git a/centos7/Dockerfile b/centos7/Dockerfile
index 238b50ff55c91320ad683f3fff72d50327340c15..0f2112db2aeaea10b0e94b99ed16ec31931254b5 100644 (file)
--- a/centos7/Dockerfile
+++ b/centos7/Dockerfile
@@ -17,7 +17,22 @@ 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           && \
     \
     \
@@ -25,22 +40,39 @@ RUN echo "===> Installing EPEL..."        && \
     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..."     && \
-    yum -y install ansible sudo           && \
+    pip 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 "===> Removing unused YUM resources..."   && \
-    yum -y remove epel-release                     && \
-    yum clean all                                  && \
+    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 -e '[local]\nlocalhost\n' > /etc/ansible/hosts
+    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