On 06/09/2012, at 12:30 AM, Lars Marowsky-Bree <l...@suse.com> wrote:
> On 2012-09-05T15:25:44, Dejan Muhamedagic <de...@suse.de> wrote: > >> How about a new element. Something like >> >> primitive vm1 ocf:heartbeat:VirtualDomain >> require vm1 web-test dns-test > > How we map this into Pacemaker's dependency scheme is obviously open to > discussion. > >> The "require" would imply that the resource vm1 requires >> monitors of web-test and dns-test to succeed, in addition to its >> monitor (if defined). > > Perhaps. But an "as-a-whole" attribute for groups to restart handling > might already be enough, since we would want the system to eventually > stabilize at the same state it runs to today (that is, with the group > brought up to the last non-failing resource; otherwise, admins > couldn't login to the VM to fix the problem). Those two requirements seem at odds with each other. I doubt it would end well. I suspect you really want the "restart everything" trigger to be attached to the "monitor only" resource (at the end). > >> Monitor ops of web-test and dns-test will run only on the node where >> vm1 is started. They could in also get the environment (parameters) of >> vm1. > > That's implicit in the group. > > Internally, this could indeed map to a "symmetric" or whatever aspect of > the order dependency, yes, that could be set for the whole group. > >> monocf may be just like ocf, sans start and stop operations. >> That would make all ocf RA elligible for this use. > > None of the current resource agents would be able to cope with the use > case I suggested, because they expect to run in the OS image where the > service is provided - the idea of using the icinga/nagios plugins is > exactly that they don't have this requirement, and thus can monitor the > VM externally. > > For OCF agents, this sort-of already exists: meta is-managed=false. > > > Regards, > Lars > > -- > Architect Storage/HA > SUSE LINUX Products GmbH, GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, > HRB 21284 (AG Nürnberg) > "Experience is the name everyone gives to their mistakes." -- Oscar Wilde > > _______________________________________________________ > Linux-HA-Dev: Linux-HA-Dev@lists.linux-ha.org > http://lists.linux-ha.org/mailman/listinfo/linux-ha-dev > Home Page: http://linux-ha.org/ _______________________________________________________ Linux-HA-Dev: Linux-HA-Dev@lists.linux-ha.org http://lists.linux-ha.org/mailman/listinfo/linux-ha-dev Home Page: http://linux-ha.org/
