Cellular Network Infrastructure

https://jenkins.osmocom.org/jenkins/job/update-osmo-ci-on-slaves/

The job runs fine on all other hosts, but on build2-deb8build-ansible it fails to rebuild the docker image:

cgroups: cannot find cgroup mount destination: unknown

I found this thread, with a proposed workaround: https://github.com/docker/for-linux/issues/219

Temp fix:
sudo mkdir /sys/fs/cgroup/systemd
sudo mount -t cgroup -o none,name=systemd cgroup /sys/fs/cgroup/systemd

So my guess is, that /sys/fs/cgroup/systemd is not mounted properly on the system?

FWIW, on my debian 9 installation, building the image works and /sys/fs/cgroup/systemd seems to get mounted automatically by systemd at boot. It is not in /etc/fstab.

Maybe a simple reboot fixes this. Can somebody with access to the server have a look at it?