[ClusterLabs] Antw: [EXT] node utilization attributes are lost during upgrade

[Ulrich Windl]

>>> Kadlecsik József <kadlecsik.jozsef at wigner.hu> schrieb am 17.08.2020 um
12:12 in
Nachricht <alpine.DEB.2.23.453.2008171134050.25087 at blackhole.kfki.hu>:
> Hello,
> 
> At upgrading a corosync/pacemaker/libvirt/KVM cluster from Debian stretch 
> to buster, all the node utilization attributes were erased from the 
> configuration. However, the same attributes were kept at the VirtualDomain 
> resources. This resulted that all resources with utilization attributes 
> were stopped.
> 
> The documentation says: "You can name utilization attributes according to 
> your preferences and define as many name/value pairs as your configuration 
> needs.", so one assumes utilization attributes are kept during upgrades, 
> for nodes and resources as well.

Now that you mention it, I think we had it in the past with SLES, too.

> 
> The corosync incompatibility made the upgrade more stressful anyway and 
> the stopping of the resources came out of the blue. The resources could 
> not be started of course ‑ and there were no log warning/error messages 
> that the resources are not started because the utilization constrains 
> could not be satisfied. Pacemaker logs a lot (from admin point of view it 
> is too much), but in this case there was no indication why the resources 
> could not be started (or we were unable to find it in the logs?). So we 
> wasted a lot of time with debugging the VirtualDomain agent.

Also true: It's not very obvious when resources are not started due to
utilization constraints.

> 
> Currently we run the cluster with the placement‑strategy set to default.
> 
> In my opinion node attributes should be kept and preserved during an 
> upgrade. Also, it should be logged when a resource must be stopped/cannot 
> be started because the utilization constrains cannot be satisfied.

+1

> 
> Best regards,
> Jozsef
> ‑‑
> E‑mail : kadlecsik.jozsef at wigner.hu 
> PGP key: https://wigner.hu/~kadlec/pgp_public_key.txt 
> Address: Wigner Research Centre for Physics
>          H‑1525 Budapest 114, POB. 49, Hungary
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