[ClusterLabs] Trying to Understanding crm-fence-peer.sh
arvidjaar at gmail.com
Wed Jan 16 23:57:25 EST 2019
16.01.2019 19:49, Bryan K. Walton пишет:
> On Wed, Jan 16, 2019 at 04:53:32PM +0100, Lars Ellenberg wrote:
>> To clarify: crm-fence-peer.sh is an *example implementation*
>> (even though an elaborate one) of a DRBD fencing policy handler,
>> which uses pacemaker location constraints on the Master role
>> if DRBD is not sure about the up-to-date-ness of that instance,
>> to ban nodes from taking over the Master role.
>> It does NOT trigger node level fencing.
>> But it has to wait for, and rely on, pacemaker node level fencing.
> Thanks Lars. Between these comments, and the man page for drbd.conf, I
> think I understand what is going on here. Is it correct to say, that in
> the case I provided, that DRBD successfully issued a "drbdadm outdate
> res" on the other node, and therefore it didn't need to STONITH the
That is not what your logs show. DRBD successfully issued fence-peer
handler on local node. crm-fence-peer.sh won't attempt to run anything
on other node. DRBD just calls fence-peer handler, it is up to handler
to issue explicit stonith request if appropriate.
> (Looking at the crm-fence-peer code, I see that exit code 4 is
> node fenced, but there is an exit code 7 which means STONITHED. In my
> case, I got an exit code 4, and not a 7.)
crm-fence-peer.sh return 7 when it detected that pacemaker performed
STONITH on peer on its own. crm-fence-peer.sh does not initiate stonith
by itself (as far as I can tell).
> Also you mentioned that "Other implementations of drbd fencing policy
> handlers may directly escalate to node level fencing."
> Are these "other implementations" third-party handlers? Or are they
> available from within the DRBD software? Can you point to any of these?
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