Gerry,
Dear community,
I would like to ask few questions regarding Corosync/Pacemaker quorum
configuration.
When updating the Corosync's quorum configuration I added last_man_standing, and
auto_tie_breaker in corosync.conf on all hosts and refreshed with
'corosync-cfgtool -R'.
Note that that man page included with the rpm says that the -R option with "Tell
all instances of corosync in this cluster to reload corosync.conf."
Next I run 'corosync-quorumtool -s', but it did not show the new quorum flags
for auto tiebreaker and last man standing.
Once I restarted the corosync cluster, the auto tiebreaker flags and last man
standing flags appeared in the corosync-quorumtool output as I expected.
So my questions are:
1. Does corosync-quorumtool actually shows the active quorum configuration? If
not how can I query the active quorum config?
Yes, corosync-quorumtool shows quorum configuration which is really used
(it's actually only source of truth, cmap is not).
2. Is it possible to update the quorum configuration without restarting the
cluster?
Partly.
Basically only quorum.two_node and quorum.expected_votes are changeable
during runtime. Other options like:
- quorum.allow_downscale
- quorum.wait_for_all
- quorum.last_man_standing
- quorum.auto_tie_breaker
- quorum.auto_tie_breaker_node
are not (wait_for_all is a little bit more complicated - when not
explicitly set/unset it follows two_node so it is possible, but only in
this special case, to change it via changing two_node).
Regards,
Honza
btw. I've already replied to Janghyuk Boo so mostly copying same answer
also here.
Thank you,
Gerry Sommerville
E-mail: [email protected] <mailto:[email protected]>
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