Public bug reported:
[Rationale]
ZFS module of docker creates many snapshots under
<pool>/ROOT/machineid/var/lib/<ID>. These snapshots are processed by zsys and
lead to timeout.
This patch migrates the snapshots created by docker under the persistent
dataset <pool>/var/lib/docker/ so they are scanned and then ignored by
zsys.
[Test Case]
1. On a machine with docker installed, create a docker container:
$ docker run ubuntu
2. Verify that docker created snapshots under
<pool>/ROOT/machineid/var/lib/<ID> with zfs list
3. Install the new version
4. Verify that the snapshots have been migrated to <pool>/var/lib/docker/
5. Verify that docker is still working:
$ docker run ubuntu
[Regression Potential]
The change only affects the postinst.
The risk is that dataset are not migrated or partially migrated. Then new
snapshots are created on a different location and containers created or run
from an existing image won't start.
** Affects: docker.io (Ubuntu)
Importance: High
Assignee: Didier Roche (didrocks)
Status: Triaged
** Changed in: docker.io (Ubuntu)
Status: New => Triaged
** Changed in: docker.io (Ubuntu)
Importance: Undecided => High
** Changed in: docker.io (Ubuntu)
Assignee: (unassigned) => Didier Roche (didrocks)
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https://bugs.launchpad.net/bugs/1879473
Title:
hundreds of snapshots created by docker zfs lead to zsys timeout
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