Add: systemd support in CentOS 7

@see https://hub.docker.com/_/centos/
@see https://github.com/vlisivka/docker-centos7-systemd-unpriv

2 files changed, 29 insertions, 2 deletions

diff --git a/centos7-onbuild/Dockerfile b/centos7-onbuild/Dockerfile
index 7d6caf0..9274bee 100644
--- a/centos7-onbuild/Dockerfile
+++ b/centos7-onbuild/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           && \
     \
     \
@@ -48,6 +63,19 @@ RUN echo "===> Installing EPEL..."        && \
     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" ]
+
+
 COPY ansible-playbook-wrapper /usr/local/bin/
 
 ONBUILD  WORKDIR /tmp
diff --git a/centos7-onbuild/ansible-playbook-wrapper b/centos7-onbuild/ansible-playbook-wrapper
index 0ba45e6..002158d 100755
--- a/centos7-onbuild/ansible-playbook-wrapper
+++ b/centos7-onbuild/ansible-playbook-wrapper
@@ -13,7 +13,6 @@
 #    - INVENTORY:    inventory filename;    default = "/etc/ansible/hosts"
 #
 
-
 #
 # install Galaxy roles, if any
 #