On 06/12/2012, at 10:42 PM, Lars Marowsky-Bree <l...@suse.com> wrote:
> On 2012-12-06T22:25:40, Andrew Beekhof <and...@beekhof.net> wrote: > >> But any failures of the nagios agents would count against the VM's >> migration-threshold. >> So if moving were the right thing to do, it would have done it already. > > OK. I think this was due to me still being stuck on the workings of an > order constraint, but of course if the failures are instead attributed > to the container, this would happen automatically already. True. > > (Incidentally, I like "attribute", "ascribe" better than "delegate" > because to me, they better fit what's going on, if we sticked with > "delegate-failures". Just saying. ;-) My use of "delegate" comes from my time with ObjectiveC where its common practice to use them for "I'm not going to handle X but here is something that does" style functionality. Which fits nicely with what we're doing here. container="vm" also works though. > >>> We already have on-fail settings. How would these play together? >> Good question. My initial thought was that it would be up to on-fail >> settings in the VM. > > I'd prefer to keep that separate (as proposed below). Because if an > action of the *VM* really fails, I may want an admin to look into it > (why could the bloody hypervisor not start/stop it?), which is different > from restarting the VM if one of the resources within it needs that. > >>> Would it even make sense to have on-fail="restart-container"? (Or a >>> nicer wording.) >>> >>> Hmmm. That might work. We allow a "container" to be specified as a meta >>> attribute. >>> >>> If set, on-fail would default to restart container for most actions. But >>> admins could actually modify it - say, they might want to set >>> monitor on-fail="ignore" to just get notified. And when we move forward >>> to whiteboxes, we could have start/monitor/promote/demote >>> on-fail="restart" (like now) and stop on-fail="restart-container". >>> >>> That appears reasonably neat? >> It does actually. >> I wasn't originally thinking it was necessary but it makes sense now >> that you point it out. > > Yes, I think I like this too now. > > Uhm. Would "container" imply ordering + colocation, or would we still > need them grouped (resource_set'ed, whatever)? Ordering: absolutely Colocation is less clear, I think the default is no but David has suggested an additional meta attribute to turn it on. > > My, design is hard. ;-) I like where we got to in the end though, it should handle both white and black box monitoring nicely. Being a PITA can have its benefits. _______________________________________________ Pacemaker mailing list: Pacemaker@oss.clusterlabs.org http://oss.clusterlabs.org/mailman/listinfo/pacemaker Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://bugs.clusterlabs.org
