Btw, an interesting question. How much efforts would it take to support a
migration of a Master role over the nodes? An use-case is drbd, configured
for a multi-master mode internally, but with master-max=1 in the resource
definition. Assuming that resource-agent supports that flow -
1. Do nothing.
2. Promote on a dest node.
3. Demote on a source node.
Actually just wonder, because may be it could be some-how achievable to
migrate VM which are on top of drbd which is not a multi-master in
pacemaker. Fully theoretical case. Didn't verify the flow in-the-mind.
I believe that currently only the top-most resource is allowed to migrate,
but may be there is some room for impovement?
Sorry for the off-topic.
Best
Vlad
Ken Gaillot <kgail...@redhat.com> 18 апреля 2023 г. 18:23:00 написал:
On Tue, 2023-04-18 at 14:58 +0200, lejeczek via Users wrote:
Hi guys.
When it's done by the cluster itself, eg. a node goes 'standby' - how
do clusters migrate VirtualDomain resources?
1. Call resource agent migrate_to action on original node
2. Call resource agent migrate_from action on new node
3. Call resource agent stop action on original node
Do users have any control over it and if so then how?
The allow-migrate resource meta-attribute (true/false)
I'd imagine there must be some docs - I failed to find
It's sort of scattered throughout Pacemaker Explained -- the main one
is:
https://clusterlabs.org/pacemaker/doc/2.1/Pacemaker_Explained/html/advanced-options.html#migrating-resources
Especially in large deployments one obvious question would be - I'm
guessing as my setup is rather SOHO - can VMs migrate in sequence or
it is(always?) a kind of 'swarm' migration?
The migration-limit cluster property specifies how many live migrations
may be initiated at once (the default of -1 means unlimited).
--
Ken Gaillot <kgail...@redhat.com>
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