ceilometer-compute-agent service can fail to connect to socket and not report metrics

[Zachary Zehring]

There appears to be a race condition between libvirt and the ceilometer-agent-compute service. We had an environment where all the agent services were not reporting instance metrics for ceilometer. We found that all the ceilometer-agent-compute services had the following error status:

ceilometer-agent-compute[2706]: libvirt: XML-RPC error : Failed to connect socket to '/var/run/libvirt/libvirt-sock-ro': No such file or directory

Some things of note:
- all /var/log/ceilometer/ceilometer-agent-compute.log files were empty
- the service was in "active (running)"
- ceilometer-agent charm is on latest version
- virsh/libvirtd is on 5.0.0

A ceilometer-agent-compute service restart fixed the issue and enabled instance metric gathering. It may be beneficial to put a check to ensure ceilometer-agent-compute service is not only running but functioning as expected.

[Alex Kavanagh (ajkavanagh)]

Please could you include the bundle (sanitized as needed) and the juju log files (or a crashdump).

[Launchpad Janitor (janitor)]

[Expired for OpenStack ceilometer-agent charm because there has been no activity for 60 days.]