[Bug 1192081] New: Modify base image Dockerfile to enable systemd to run smoothly

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1192081

            Bug ID: 1192081
           Summary: Modify base image Dockerfile to enable systemd to run
                    smoothly
           Product: Fedora
           Version: rawhide
         Component: docker-io
          Assignee: lsm5(a)redhat.com
          Reporter: vpavlin(a)redhat.com
        QA Contact: extras-qa(a)fedoraproject.org
                CC: adimania(a)gmail.com, admiller(a)redhat.com,
                    golang(a)lists.fedoraproject.org, hushan.jia(a)gmail.com,
                    jchaloup(a)redhat.com, jperrin(a)centos.org,
                    lsm5(a)redhat.com, mattdm(a)redhat.com,
                    mgoldman(a)redhat.com, miminar(a)redhat.com, s(a)shk.io,
                    thrcka(a)redhat.com, vbatts(a)redhat.com



Description of problem:
systemd requires container=docker set in env and /run, /tmp to be mountpoints
start successfully. In my opinion, we should add 

ENV container=docker
VOLUME ['/run', '/tmp']

to the base image Dockerfile.

Command

docker run --it --rm -v /sys/fs/cgroup:/sys/fs/cgroup:ro fedora:rawhide
/usr/sbin/init

would then be all an user would need to "boot" systemd in a container.

I've already made some changes in KS file - remove fstab and machine-id, mask
mount units... which make the boot sequence smooth. 

More changes to boot sequence will probably come later (f.e. switch from
graphical.target to multi-user target)

I'd also like to suggest new Rawhide build to be pushed to registry. This one
works for me quite well: 
http://koji.fedoraproject.org/koji/taskinfo?taskID=8883309

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