The docker daemon won't start inside my Ubuntu 18.04.4 LTS, started with overlayroot.

sudo journalctl --no-hostname --no-pager -b -u docker.service

gives me, among other things, this:

Feb 19 13:10:30 dockerd[1815]: Error starting daemon: rename /var/lib/docker/runtimes /var/lib/docker/runtimes-old: invalid cross-device link

From what I found out, this is telling me that somewhere down the line, overlay2fs is mounted inside an overlay2fs which doesn't seem to work.

Question: what do I need to do to start a Docker service inside an overlayroot environment?

1 Answer

I can just bind-mount the docker directory from the overlay'd filesystem. This works:

mount --bind /media/root-rw/overlay/var/lib/docker /var/lib/docker
systemctl start docker

Unfortunately, I'm still having trouble getting this to work at startup, but that's for another question.

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