[Pacemaker] Pacemaker 1.1.8, Corosync, No CMAN, Promotion issues

Thu Apr 11 22:29:48 UTC 2013

On 11/04/2013, at 8:15 AM, pavan tc <pavan.tc at gmail.com> wrote:

> Hi,
> 
> [I did go through the mail thread titled: "RHEL6 and clones: CMAN needed anyway?", but was not sure about some answers there]
> 
> I recently moved from pacemaker 1.1.7 to 1.1.8-7 on centos 6.2. I see the following in syslog:
> 
> corosync[2966]:   [pcmk  ] ERROR: process_ais_conf: You have configured a cluster using the Pacemaker plugin for Corosync. The plugin is not supported in this environment and will be removed very soon.
> corosync[2966]:   [pcmk  ] ERROR: process_ais_conf:  Please see Chapter 8 of 'Clusters from Scratch' (http://www.clusterlabs.org/doc) for details on using Pacemaker with CMAN
> 
> Does this mean that my current configuration is incorrect and will not work as it used to with pacemaker 1.1.7/Corosync?

It will continue to work until the Pacemaker plugin is removed from RHEL.

> 
> I looked at the "Clusters from Scratch" instructions and it talks mostly about GFS2. I don't have any filesystem requirements. In that case, can I live with Pacemaker/Corosync?

Yes, but only until the Pacemaker plugin is removed from RHEL.

> 
> I do understand that this config is not recommended, but the reason I ask is because I am hitting a weird problem with this setup which I will explain below. Just want to make sure that I don't start off with an erroneous setup.
> 
> I have a two-node multi-state resource configured with the following config:
> 
> [root at vsanqa4 ~]# crm configure show
> node vsanqa3
> node vsanqa4
> primitive vha-6f92a1f6-969c-4c41-b9ca-7eb6f83ace2e ocf:heartbeat:vgc-cm-agent.ocf \
>         params cluster_uuid="6f92a1f6-969c-4c41-b9ca-7eb6f83ace2e" \
>         op monitor interval="30s" role="Master" timeout="100s" \
>         op monitor interval="31s" role="Slave" timeout="100s"
> ms ms-6f92a1f6-969c-4c41-b9ca-7eb6f83ace2e vha-6f92a1f6-969c-4c41-b9ca-7eb6f83ace2e \
>         meta clone-max="2" globally-unique="false" target-role="Started"
> location ms-6f92a1f6-969c-4c41-b9ca-7eb6f83ace2e-nodes ms-6f92a1f6-969c-4c41-b9ca-7eb6f83ace2e \
>         rule $id="ms-6f92a1f6-969c-4c41-b9ca-7eb6f83ace2e-nodes-rule" -inf: #uname ne vsanqa4 and #uname ne vsanqa3
> property $id="cib-bootstrap-options" \
>         dc-version="1.1.8-7.el6-394e906" \
>         cluster-infrastructure="classic openais (with plugin)" \
>         expected-quorum-votes="2" \
>         stonith-enabled="false" \
>         no-quorum-policy="ignore"
> rsc_defaults $id="rsc-options" \
>         resource-stickiness="100"
> 
> With this config, if I simulate a crash on the master with "echo c > /proc/sysrq-trigger", the slave does not get promoted for about 15 minutes. It does detect the peer going down, but does not seem to issue the promote immediately:
> 
> Apr 10 14:12:32 vsanqa4 corosync[2966]:   [TOTEM ] A processor failed, forming new configuration.
> Apr 10 14:12:38 vsanqa4 corosync[2966]:   [pcmk  ] notice: pcmk_peer_update: Transitional membership event on ring 166060: memb=1, new=0, lost=1
> Apr 10 14:12:38 vsanqa4 corosync[2966]:   [pcmk  ] info: pcmk_peer_update: memb: vsanqa4 1967394988
> Apr 10 14:12:38 vsanqa4 corosync[2966]:   [pcmk  ] info: pcmk_peer_update: lost: vsanqa3 1950617772
> Apr 10 14:12:38 vsanqa4 corosync[2966]:   [pcmk  ] notice: pcmk_peer_update: Stable membership event on ring 166060: memb=1, new=0, lost=0
> Apr 10 14:12:38 vsanqa4 corosync[2966]:   [pcmk  ] info: pcmk_peer_update: MEMB: vsanqa4 1967394988
> Apr 10 14:12:38 vsanqa4 corosync[2966]:   [pcmk  ] info: ais_mark_unseen_peer_dead: Node vsanqa3 was not seen in the previous transition
> Apr 10 14:12:38 vsanqa4 corosync[2966]:   [pcmk  ] info: update_member: Node 1950617772/vsanqa3 is now: lost
> Apr 10 14:12:38 vsanqa4 corosync[2966]:   [pcmk  ] info: send_member_notification: Sending membership update 166060 to 2 children
> Apr 10 14:12:38 vsanqa4 corosync[2966]:   [TOTEM ] A processor joined or left the membership and a new membership was formed.
> Apr 10 14:12:38 vsanqa4 cib[3386]:   notice: ais_dispatch_message: Membership 166060: quorum lost
> Apr 10 14:12:38 vsanqa4 crmd[3391]:   notice: ais_dispatch_message: Membership 166060: quorum lost
> Apr 10 14:12:38 vsanqa4 cib[3386]:   notice: crm_update_peer_state: crm_update_ais_node: Node vsanqa3[1950617772] - state is now lost
> Apr 10 14:12:38 vsanqa4 crmd[3391]:   notice: crm_update_peer_state: crm_update_ais_node: Node vsanqa3[1950617772] - state is now lost
> Apr 10 14:12:38 vsanqa4 corosync[2966]:   [CPG   ] chosen downlist: sender r(0) ip(172.16.68.117) ; members(old:2 left:1)
> Apr 10 14:12:38 vsanqa4 corosync[2966]:   [MAIN  ] Completed service synchronization, ready to provide service.
> 
> Then (after about 15 minutes), I see the following:

There were no logs at all in between?

> 
> Apr 10 14:26:46 vsanqa4 crmd[3391]:   notice: do_state_transition: State transition S_IDLE -> S_POLICY_ENGINE [ input=I_PE_CALC cause=C_TIMER_POPPED origin=crm_timer_popped ]
> Apr 10 14:26:46 vsanqa4 pengine[3390]:   notice: unpack_config: On loss of CCM Quorum: Ignore
> Apr 10 14:26:46 vsanqa4 pengine[3390]:   notice: LogActions: Promote vha-6f92a1f6-969c-4c41-b9ca-7eb6f83ace2e:0#011(Slave -> Master vsanqa4)
> Apr 10 14:26:46 vsanqa4 pengine[3390]:   notice: process_pe_message: Calculated Transition 3: /var/lib/pacemaker/pengine/pe-input-392.bz2
> 
> Thanks,
> Pavan
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