Investigating a bit more, here's what we see when we check the status of
docker.socket:
# systemctl status docker.socket
× docker.socket - Docker Socket for the API
Loaded: loaded (/lib/systemd/system/docker.socket; enabled; vendor preset:
enabled)
Active: failed (Result: exit-code) since Wed 2021-09-01 02:05:47 UTC; 14s
ago
Triggers: ● docker.service
Listen: /run/docker.sock (Stream)
Sep 01 02:05:47 test-docker systemd[1]: Starting Docker Socket for the API.
Sep 01 02:05:47 test-docker systemd[2488]: docker.socket: Failed to resolve
group docker: No such process
Sep 01 02:05:47 test-docker systemd[1]: docker.socket: Control process exited,
code=exited, status=216/GROUP
Sep 01 02:05:47 test-docker systemd[1]: docker.socket: Failed with result
'exit-code'.
Sep 01 02:05:47 test-docker systemd[1]: Failed to listen on Docker Socket for
the API.
What caught my attention is the following line:
Sep 01 02:05:47 test-docker systemd[2488]: docker.socket: Failed to
resolve group docker: No such process
It doesn't make sense to me. As can be seen in the bug description, the
"docker" group was properly created *before* the service/socket was
(tentatively) started.
If we inspect the socket, we see that its group is indeed wrong (it
should be "docker", but it's "root"):
# ls -la /var/run/docker.sock
srw-rw---- 1 root root 0 Sep 1 02:05 /var/run/docker.sock
What's strange is that systemd should be responsible for changing the
ownership of the socket when the service is started, but it can't
(because it fails to "resolve" the "docker" group). strace wasn't very
helpful to determine what's going on here.
It's also interesting to note that I can't reproduce the problem with
docker.io 20.10.7-0ubuntu1 (from impish-release). The installation
finishes just fine.
I noticed that the last upload was about shipping libnetwork into the
golang-github-docker-docker-dev package. Initially I don't see how this
could have impacted the docker installation here. Maybe libnetwork is
messing with the socket creation somehow?
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https://bugs.launchpad.net/bugs/1942276
Title:
docker 20.10.7-0ubuntu2 fails to start when installed inside Impish
LXD container
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