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Description of problem:
This problem is being tracked in https://github.com/containers/podman/issues/11214.
When using third-party volume drivers, if the volume driver returns an error when removing a volume (such as with podman volume rm) podman will remove the volume entry despite the error. This is different behavior than Docker or Moby, which instead returns the error and makes no changes to the volume.
The error message looks something like this:
# podman volume rm docvol1
Error: volume docvol1 could not be removed from plugin MYPLUGIN, but it has been removed from Podman: MYPLUGIN had some sort of error
Podman's behavior: https://github.com/containers/podman/blob/main/libpod/runtime_volume_linux.go#L286-L292
Moby's behavior: https://github.com/moby/moby/blob/master/volume/drivers/proxy.go#L71-L73
While it's probably good to clean this up, this is a difference in what some volume plugins expect to happen, so we've had volume driver providers reach out and ask for this behavior to be uniform across podman and Docker.
Version-Release number of selected component (if applicable):
podman-3.2.3-0.10.module+el8.4.0+11989+6676f7ad.x86_64
How reproducible:
Every time
Actual results:
Volume is removed from podman boltdb despite error.
Expected results:
Volume should not be removed in case of error to match Docker/Moby behavior.
Additional info:
Those looking for latest information on the state of fixing this bug should look to the above mentioned Github issue.
Test with podman-3.3.1-7.module+el8.5.0+12442+516c7b38.x86_64 with a modified version of testvol. And it works as expected.
# podman volume rm testVolume1
Error: volume testVolume1 could not be removed from plugin testvol4: error on /VolumeDriver.Remove on volume testVolume1 in volume plugin testvol4: Raise error for testing
# podman volume ls
DRIVER VOLUME NAME
testvol4 testVolume1
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (Moderate: container-tools:rhel8 security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHSA-2021:4154