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Bug
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Resolution: Unresolved
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Major
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None
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Jenkins 2.346.2 installed via apt
Ubuntu 20.04.4 LTS
After the update from 2.346.1 to 2.346.2 (including all plugins at that time) the libvirt plugin stopped working for me.
Problems:
- The slave configuration is accessible but I cannot see/select any hypervisor
- There is a "Uncategorized/libvirt" section in the /manage menu
- The icons are not loaded (404 error)
- There are no hypervisors
- No option to edit or create hypervisors
- The "Cloud" section in "Manage Jenkins" mentioned by the documentation is gone
What I did:
- Tried to build a project using the plugin that last succeeded on 28. June with Jenkins 2.346.1
- Failed because the agent did not start
- Checked the slave config page and hypervisor was selectable but no snapshots
- Hypervisor was listed under "Uncategorized/libvirt" but I could not see any config
- Disabled the plugin and restarted Jenkins
- Enabled the plugin again and restarted Jenkins
- Hypervisor is gone
- I could not find any error messages in the Jenkins log
- Slave config page says "ERROR: Could not find our libvirt cloud instance!"
Additional information:
On 23. June I upgraded from 2.319.2 to 2.346.1 and on 28. June the last build was done.
I always update the Jenkins plugins along with the apt updates.
[JENKINS-69243] libvirt plugin broken after upgrade to 2.346.2
Bastian Germann
added a comment - First question: Did you update libvirt with apt? What version do you run now?
The icons should be fixed with the next upload. There was already a contribution to fix this.
The documentation (Cloud option) may be outdated for current Jenkins version but not for the oldest supported Jenkins version.
There was never a plugin version that had support for pubkey authentication via the Jenkins credential provider. I guess it worked for you with a the "ssh" method because that just uses the SSH system configuration.
So this bug report boils down to "plugin configuration vanished", am I right?
Bastian Germann
added a comment - First question: Did you update libvirt with apt? What version do you run now?
The icons should be fixed with the next upload. There was already a contribution to fix this.
The documentation (Cloud option) may be outdated for current Jenkins version but not for the oldest supported Jenkins version.
There was never a plugin version that had support for pubkey authentication via the Jenkins credential provider. I guess it worked for you with a the "ssh" method because that just uses the SSH system configuration.
So this bug report boils down to "plugin configuration vanished", am I right? 
Richard
added a comment - The version used during the upgrade was 6.0.0-0ubuntu8.16.
It was last updated on 2022-05-04 while running Jenkins 2.319.2 and it worked with this version.
(Upgrade: libvirt-clients:amd64 (6.0.0-0ubuntu8.15, 6.0.0-0ubuntu8.16), libvirt0:amd64 (6.0.0-0ubuntu8.15, 6.0.0-0ubuntu8.16))
It would be nice if the documentation could also link to the new site, because it is definitely not easy to find. (jenkins.server/configureClouds/)
If the credential provider was not used, I must have configured ssh at the system level.
So this bug report boils down to "plugin configuration vanished", am I right?
Yes
Thank you anyway
Richard
added a comment - The version used during the upgrade was 6.0.0-0ubuntu8.16.
It was last updated on 2022-05-04 while running Jenkins 2.319.2 and it worked with this version.
(Upgrade: libvirt-clients:amd64 (6.0.0-0ubuntu8.15, 6.0.0-0ubuntu8.16), libvirt0:amd64 (6.0.0-0ubuntu8.15, 6.0.0-0ubuntu8.16))
It would be nice if the documentation could also link to the new site, because it is definitely not easy to find. (jenkins.server/configureClouds/)
If the credential provider was not used, I must have configured ssh at the system level.
So this bug report boils down to "plugin configuration vanished", am I right?
Yes
Thank you anyway 
I managed to get the plugin working again.
The "Cloud" option is now located under "Manage Jenkins->Manage Nodes and Clouds->Configure Clouds(left side)" (or example.com/configureClouds/), so the documentation is definitely outdated.
The configured hypervisor vanished, I am not sure if this happened during the update or by disabling/enabling the plugin.
I created a new hypervisor and found that it seems to be impossible to use ssh/pubkey authentication with ssh or libssh2 using the Jenkins credential provider.
The last ssh/pubkey configuration was saved this way, so maybe this was the problem.
I had to configure a new ssh key using the "URI parameters" (system?keyfile=/var/lib/jenkins/.ssh/keyfile&no_verify=1&). Unfortunately, this is not an improvement.
The "Uncategorized/libvirt" (example.com/libvirt-slave/) page shows the hypervisor and I can also view its "Domains" status page, the last time I could not open the status page. The icons are still not loaded (404).