Public bug reported:
docker seems to not be able to start because of a pid file that was left behind.
This only happened on one of my hosts and hasn't happened again after fixing it.
I get these logs over and over again:
2020-04-30T06:47:38Z systemd[1]: Started Service for snap application
docker.dockerd.
2020-04-30T06:47:49Z docker.dockerd[1127]: Error starting daemon: pid file
found, ensure docker is not running or delete
/var/snap/docker/423/run/docker.pid
2020-04-30T06:47:49Z systemd[1]: snap.docker.dockerd.service: Main process
exited, code=exited, status=1/FAILURE
2020-04-30T06:47:49Z systemd[1]: snap.docker.dockerd.service: Failed with
result 'exit-code'.
2020-04-30T06:47:50Z systemd[1]: snap.docker.dockerd.service: Service
RestartSec=100ms expired, scheduling restart.
2020-04-30T06:47:50Z systemd[1]: snap.docker.dockerd.service: Scheduled restart
job, restart counter is at 1.
2020-04-30T06:47:50Z systemd[1]: Stopped Service for snap application
docker.dockerd.
2020-04-30T06:47:50Z systemd[1]: Started Service for snap application
docker.dockerd.
2020-04-30T06:47:50Z docker.dockerd[1325]: Error starting daemon: pid file
found, ensure docker is not running or delete
/var/snap/docker/423/run/docker.pid
2020-04-30T06:47:50Z systemd[1]: snap.docker.dockerd.service: Main process
exited, code=exited, status=1/FAILURE
2020-04-30T06:47:50Z systemd[1]: snap.docker.dockerd.service: Failed with
result 'exit-code'.
2020-04-30T06:47:50Z systemd[1]: snap.docker.dockerd.service: Service
RestartSec=100ms expired, scheduling restart.
2020-04-30T06:47:50Z systemd[1]: snap.docker.dockerd.service: Scheduled restart
job, restart counter is at 2.
2020-04-30T06:47:50Z systemd[1]: Stopped Service for snap application
docker.dockerd.
2020-04-30T06:47:50Z systemd[1]: Started Service for snap application
docker.dockerd.
2020-04-30T06:47:50Z docker.dockerd[1390]: Error starting daemon: pid file
found, ensure docker is not running or delete
/var/snap/docker/423/run/docker.pid
2020-04-30T06:47:50Z systemd[1]: snap.docker.dockerd.service: Main process
exited, code=exited, status=1/FAILURE
2020-04-30T06:47:50Z systemd[1]: snap.docker.dockerd.service: Failed with
result 'exit-code'.
2020-04-30T06:47:51Z systemd[1]: snap.docker.dockerd.service: Service
RestartSec=100ms expired, scheduling restart.
2020-04-30T06:47:51Z systemd[1]: snap.docker.dockerd.service: Scheduled restart
job, restart counter is at 3.
2020-04-30T06:47:51Z systemd[1]: Stopped Service for snap application
docker.dockerd.
2020-04-30T06:47:51Z systemd[1]: Started Service for snap application
docker.dockerd.
2020-04-30T06:47:51Z docker.dockerd[1452]: Error starting daemon: pid file
found, ensure docker is not running or delete
/var/snap/docker/423/run/docker.pid
2020-04-30T06:47:51Z systemd[1]: snap.docker.dockerd.service: Main process
exited, code=exited, status=1/FAILURE
2020-04-30T06:47:51Z systemd[1]: snap.docker.dockerd.service: Failed with
result 'exit-code'.
2020-04-30T06:47:51Z systemd[1]: snap.docker.dockerd.service: Service
RestartSec=100ms expired, scheduling restart.
2020-04-30T06:47:51Z systemd[1]: snap.docker.dockerd.service: Scheduled restart
job, restart counter is at 4.
2020-04-30T06:47:51Z systemd[1]: Stopped Service for snap application
docker.dockerd.
2020-04-30T06:47:51Z systemd[1]: Started Service for snap application
docker.dockerd.
2020-04-30T06:47:51Z docker.dockerd[1511]: Error starting daemon: pid file
found, ensure docker is not running or delete
/var/snap/docker/423/run/docker.pid
2020-04-30T06:47:51Z systemd[1]: snap.docker.dockerd.service: Main process
exited, code=exited, status=1/FAILURE
2020-04-30T06:47:51Z systemd[1]: snap.docker.dockerd.service: Failed with
result 'exit-code'.
2020-04-30T06:47:52Z systemd[1]: snap.docker.dockerd.service: Service
RestartSec=100ms expired, scheduling restart.
2020-04-30T06:47:52Z systemd[1]: snap.docker.dockerd.service: Scheduled restart
job, restart counter is at 5.
2020-04-30T06:47:52Z systemd[1]: Stopped Service for snap application
docker.dockerd.
2020-04-30T06:47:52Z systemd[1]: Started Service for snap application
docker.dockerd.
2020-04-30T06:47:52Z docker.dockerd[1573]: Error starting daemon: pid file
found, ensure docker is not running or delete
/var/snap/docker/423/run/docker.pid
2020-04-30T06:47:52Z systemd[1]: snap.docker.dockerd.service: Main process
exited, code=exited, status=1/FAILURE
2020-04-30T06:47:52Z systemd[1]: snap.docker.dockerd.service: Failed with
result 'exit-code'.
2020-04-30T06:47:52Z systemd[1]: snap.docker.dockerd.service: Service
RestartSec=100ms expired, scheduling restart.
2020-04-30T06:47:52Z systemd[1]: snap.docker.dockerd.service: Scheduled restart
job, restart counter is at 6.
2020-04-30T06:47:52Z systemd[1]: Stopped Service for snap application
docker.dockerd.
2020-04-30T06:47:52Z systemd[1]: snap.docker.dockerd.service: Start request
repeated too quickly.
2020-04-30T06:47:52Z systemd[1]: snap.docker.dockerd.service: Failed with
result 'exit-code'.
2020-04-30T06:47:52Z systemd[1]: Failed to start Service for snap application
docker.dockerd.
** Affects: docker (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1880022
Title:
pid file prevents starting the docker snap
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