There is an ordering constraint - everything must be started after the king
resource. But even if this constraint didn't exist I don't see that it should
logically make any difference due to all the non-clone resources being
colocated with the master of the king resource. Surely it would make no sense
for Pacemaker to start or move colocated resources until a master king resource
has been elected?
<tags>
<tag id="servant2_dependents">
<obj_ref id="servant4"/>
<obj_ref id="servant5"/>
<obj_ref id="servant6"/>
<obj_ref id="servant7"/>
<obj_ref id="servant8"/>
<obj_ref id="servant9_active_disabled"/>
<obj_ref id="servant11"/>
<obj_ref id="servant12"/>
<obj_ref id="servant13"/>
</tag>
</tags>
<constraints>
<rsc_colocation id="colocation_with_king_resource_master" score="INFINITY">
<resource_set id="king_resource_master_dependents" sequential="false">
<resource_ref id="stk_shared_ip"/>
<resource_ref id="servant4"/>
<resource_ref id="servant5"/>
<resource_ref id="servant6"/>
<resource_ref id="servant7"/>
<resource_ref id="servant8"/>
<resource_ref id="servant9_active_disabled"/>
<resource_ref id="servant10"/>
<resource_ref id="servant11"/>
<resource_ref id="servant12"/>
<resource_ref id="servant13"/>
</resource_set>
<resource_set id="king_resource_master" sequential="true" role="Master">
<resource_ref id="ms_king_resource"/>
<resource_ref id="ms_servant2"/>
<resource_ref id="ms_servant3"/>
</resource_set>
</rsc_colocation>
<rsc_order id="dependents_after_servant2" kind="Mandatory"
first="ms_servant2" then="servant2_dependents"/>
</constraints>
Regards,
Harvey
________________________________________
From: Users <users-boun...@clusterlabs.org> on behalf of Andrei Borzenkov
<arvidj...@gmail.com>
Sent: Saturday, 29 June 2019 4:13 p.m.
To: users@clusterlabs.org
Subject: EXTERNAL: Re: [ClusterLabs] Problems with master/slave failovers
29.06.2019 6:01, Harvey Shepherd пишет:
>
> As you can see, it eventually gives up in the transition attempt and starts a
> new one. Eventually the failed king resource master has had time to come back
> online and it then just promotes it again and forgets about trying to
> failover. I'm not sure if the cluster transition actions listed by
> crm_simulate are in the order in which Pacemaker tries to carry out the
> operations, but if so the order is wrong. It should be stopping all servant
> resources on the failed king master, then failing over the king resource,
> then migrating the servant resources to the new master node. Instead it seems
> to be trying to migrate all the servant resources over first, with the king
> master failover scheduled near the bottom, which won't work due to the
> colocation constraint with the king master.
Unless you configured explicit ordering between resources, pacemaker is
free to chose any order.
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