28.02.2020 01:55, Ken Gaillot пишет: > On Thu, 2020-02-27 at 22:39 +0300, Andrei Borzenkov wrote: >> 27.02.2020 20:54, Ken Gaillot пишет: >>> On Thu, 2020-02-27 at 18:43 +0100, Jehan-Guillaume de Rorthais >>> wrote: >>>>>> Speaking about shutdown, what is the status of clean shutdown >>>>>> of >>>>>> the >>>>>> cluster handled by Pacemaker? Currently, I advice to stop >>>>>> resources >>>>>> gracefully (eg. using pcs resource disable [...]) before >>>>>> shutting >>>>>> down each >>>>>> nodes either by hand or using some higher level tool (eg. pcs >>>>>> cluster stop >>>>>> --all). >>>>> >>>>> I'm not sure why that would be necessary. It should be >>>>> perfectly >>>>> fine >>>>> to stop pacemaker in any order without disabling resources. >>>> >>>> Because resources might move around during the shutdown sequence. >>>> It >>>> might >>>> not be desirable as some resource migration can be heavy, long, >>>> interfere >>>> with shutdown, etc. I'm pretty sure this has been discussed in >>>> the >>>> past. >>> >>> Ah, that makes sense, I hadn't thought about that. >> >> Is not it exactly what shutdown-lock does? It prevents resource >> migration when stopping pacemaker so my expectation is that if we >> stop >> pacemaker on all nodes no resource is moved. Or what am I missing? > > shutdown-lock would indeed handle this, if you want the behavior > whenever any node is shut down. However for this purpose, I could see > some users wanting the behavior when shutting down all nodes, but not > when shutting down just one node. >
Well, this requires pacemaker supporting notion of "cluster wide shutdown" in the first place. > BTW if all nodes shut down, any shutdown locks are cleared. > Practically, this is because they are stored in the CIB status section, > which goes away with the cluster. Logically, I could see arguments for > and against, but this makes sense. > This actually allows poor man implementation of cluster wide shutdown by setting lock immediately before stopping nodes; it could probably even be integrated directly into "pcs cluster stop --all". I wish crmsh offered something similar too. _______________________________________________ Manage your subscription: https://lists.clusterlabs.org/mailman/listinfo/users ClusterLabs home: https://www.clusterlabs.org/
