Docker files for an unprivileged systemd container based on CentOS 7.
This image is intended to be a base for other images.
To build it simply execute ./build.sh
To run a container simply execute ./run.sh
Example:
[root@mwysocki docker-systemd-unpriv]# ./build.sh
Sending build context to Docker daemon 76.8 kB
Sending build context to Docker daemon
Step 0 : FROM centos:centos7
---> ae0c2d0bdc10
Step 1 : MAINTAINER Marcel Wysocki "maci.stgn@gmail.com"
---> Using cache
---> bb4853dc1176
Step 2 : ENV container docker
---> Using cache
---> a48228da6706
Step 3 : RUN yum -y update; yum clean all
---> Using cache
---> 23b59b1a5888
Step 4 : RUN yum -y swap -- remove fakesystemd -- install systemd systemd-libs
---> Using cache
---> 18883c3a8b56
Step 5 : RUN systemctl mask dev-mqueue.mount dev-hugepages.mount systemd-remount-fs.service sys-kernel-config.mount sys-kernel-debug.mount sys-fs-fuse-connections.mount
---> Using cache
---> 1b634c72ffce
Step 6 : RUN systemctl mask display-manager.service systemd-logind.service
---> Using cache
---> e46df21a382d
Step 7 : RUN systemctl disable graphical.target; systemctl enable multi-user.target
---> Using cache
---> e5bf687364e2
Step 8 : ADD dbus.service /etc/systemd/system/dbus.service
---> Using cache
---> 9730bcba13be
Step 9 : VOLUME /sys/fs/cgroup
---> Using cache
---> dd013cf9b4b6
Step 10 : VOLUME /run
---> Using cache
---> 838484991d02
Step 11 : CMD /usr/lib/systemd/systemd
---> Using cache
---> 37f6f1fd1ec1
Successfully built 37f6f1fd1ec1
[root@mwysocki docker-systemd-unpriv]# ./run.sh
Mon Jan 12 16:45:08 CET 2015
07504197ba03c7ddc8146f6582ad729fcd4e2e2753fdca9aa6f594af6be5190c
to enter docker container run:
docker exec -t -i 07504197ba03c7ddc8146f6582ad729fcd4e2e2753fdca9aa6f594af6be5190c /bin/bash
[root@mwysocki docker-systemd-unpriv]# docker exec -t -i 07504197ba03c7ddc8146f6582ad729fcd4e2e2753fdca9aa6f594af6be5190c /bin/bash
[root@07504197ba03 /]# ps aux
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.4 0.0 46904 4452 ? Ss 15:45 0:00 /usr/lib/systemd/systemd
root 13 0.1 0.0 43000 6276 ? Ss 15:45 0:00 /usr/lib/systemd/systemd-journald
dbus 23 0.0 0.0 26432 276 ? Ss 15:45 0:00 /bin/dbus-daemon --system --fork
root 24 0.3 0.0 11748 2792 ? S 15:45 0:00 /bin/bash
root 40 0.0 0.0 19756 2128 ? R+ 15:45 0:00 ps aux
[root@07504197ba03 /]#
As an alternative you can get a pre-built container:
docker pull maci0/systemd
Or just run it using the default docker command (this should pull the image automatically):
docker run maci0/systemd
For more information see: https://registry.hub.docker.com/u/maci0/systemd/ or http://www.docker.com