[Pacemaker] Remove a "ghost" node

Sean Lutner sean at rentul.net
Thu Nov 14 23:24:54 UTC 2013 

On Nov 14, 2013, at 6:14 PM, Andrew Beekhof <andrew at beekhof.net> wrote:

> 
> On 14 Nov 2013, at 2:55 pm, Sean Lutner <sean at rentul.net> wrote:
> 
>> 
>> On Nov 13, 2013, at 10:51 PM, Andrew Beekhof <andrew at beekhof.net> wrote:
>> 
>>> 
>>> On 14 Nov 2013, at 1:12 pm, Sean Lutner <sean at rentul.net> wrote:
>>> 
>>>> 
>>>> On Nov 10, 2013, at 8:03 PM, Sean Lutner <sean at rentul.net> wrote:
>>>> 
>>>>> 
>>>>> On Nov 10, 2013, at 7:54 PM, Andrew Beekhof <andrew at beekhof.net> wrote:
>>>>> 
>>>>>> 
>>>>>> On 11 Nov 2013, at 11:44 am, Sean Lutner <sean at rentul.net> wrote:
>>>>>> 
>>>>>>> 
>>>>>>> On Nov 10, 2013, at 6:27 PM, Andrew Beekhof <andrew at beekhof.net> wrote:
>>>>>>> 
>>>>>>>> 
>>>>>>>> On 8 Nov 2013, at 12:59 pm, Sean Lutner <sean at rentul.net> wrote:
>>>>>>>> 
>>>>>>>>> 
>>>>>>>>> On Nov 7, 2013, at 8:34 PM, Andrew Beekhof <andrew at beekhof.net> wrote:
>>>>>>>>> 
>>>>>>>>>> 
>>>>>>>>>> On 8 Nov 2013, at 4:45 am, Sean Lutner <sean at rentul.net> wrote:
>>>>>>>>>> 
>>>>>>>>>>> I have a confusing situation that I'm hoping to get help with. Last night after configuring STONITH on my two node cluster, I suddenly have a "ghost" node in my cluster. I'm looking to understand the best way to remove this node from the config.
>>>>>>>>>>> 
>>>>>>>>>>> I'm using the fence_ec2 device for for STONITH. I dropped the script on each node, registered the device with stonith_admin -R -a fence_ec2 and confirmed the registration with both
>>>>>>>>>>> 
>>>>>>>>>>> # stonith_admin -I
>>>>>>>>>>> # pcs stonith list
>>>>>>>>>>> 
>>>>>>>>>>> I then configured STONITH per the Clusters from Scratch doc
>>>>>>>>>>> 
>>>>>>>>>>> http://clusterlabs.org/doc/en-US/Pacemaker/1.1-pcs/html/Clusters_from_Scratch/_example.html
>>>>>>>>>>> 
>>>>>>>>>>> Here are my commands:
>>>>>>>>>>> # pcs cluster cib stonith_cfg
>>>>>>>>>>> # pcs -f stonith_cfg stonith create ec2-fencing fence_ec2 ec2-home="/opt/ec2-api-tools" pcmk_host_check="static-list" pcmk_host_list="ip-10-50-3-122 ip-10-50-3-251" op monitor interval="300s" timeout="150s" op start start-delay="30s" interval="0"
>>>>>>>>>>> # pcs -f stonith_cfg stonith
>>>>>>>>>>> # pcs -f stonith_cfg property set stonith-enabled=true
>>>>>>>>>>> # pcs -f stonith_cfg property
>>>>>>>>>>> # pcs cluster push cib stonith_cfg
>>>>>>>>>>> 
>>>>>>>>>>> After that I saw that STONITH appears to be functioning but a new node listed in pcs status output:
>>>>>>>>>> 
>>>>>>>>>> Do the EC2 instances have fixed IPs?
>>>>>>>>>> I didn't have much luck with EC2 because every time they came back up it was with a new name/address which confused corosync and created situations like this.
>>>>>>>>> 
>>>>>>>>> The IPs persist across reboots as far as I can tell. I thought the problem was due to stonith being enabled but not working so I removed the stonith_id and disabled stonith. After that I restarted pacemaker and cman on both nodes and things started as expected but the ghost node it still there. 
>>>>>>>>> 
>>>>>>>>> Someone else working on the cluster exported the CIB, removed the node and then imported the CIB. They used this process http://clusterlabs.org/doc/en-US/Pacemaker/1.0/html/Pacemaker_Explained/s-config-updates.html
>>>>>>>>> 
>>>>>>>>> Even after that, the ghost node is still there? Would pcs cluster cib > /tmp/cib-temp.xml and then pcs cluster push cib /tmp/cib-temp.xml after editing the node out of the config?
>>>>>>>> 
>>>>>>>> No. If its coming back then pacemaker is holding it in one of its internal caches.
>>>>>>>> The only way to clear it out in your version is to restart pacemaker on the DC.
>>>>>>>> 
>>>>>>>> Actually... are you sure someone didn't just slip while editing cluster.conf?  [...].1251 does not look like a valid IP :)
>>>>>>> 
>>>>>>> In the end this fixed it
>>>>>>> 
>>>>>>> # pcs cluster cib > /tmp/cib-tmp.xml
>>>>>>> # vi /tmp/cib-tmp.xml # remove bad node
>>>>>>> # pcs cluster push cib /tmp/cib-tmp.xml
>>>>>>> 
>>>>>>> Followed by restaring pacemaker and cman on both nodes. The ghost node disappeared, so it was cached as you mentioned.
>>>>>>> 
>>>>>>> I also tracked the bad IP down to bad non-printing characters in the initial command line while configuring the fence_ec2 stonith device. I'd put the command together from the github README and some mailing list posts and laid it out in an external editor. Go me. :)
>>>>>>> 
>>>>>>>> 
>>>>>>>> 
>>>>>>>>>>> Version: 1.1.8-7.el6-394e906
>>>>>>>> 
>>>>>>>> There is now an update to 1.1.10 available for 6.4, that _may_ help in the future.
>>>>>>> 
>>>>>>> That's my next task. I believe I'm hitting the failure-timeout not clearing failcount bug and want to upgrade to 1.1.10. Is it safe to yum update pacemaker after stopping the cluster? I see there is also an updated pcs in CentOS 6.4, should I update that as well?
>>>>>> 
>>>>>> yes and yes
>>>>>> 
>>>>>> you might want to check if you're using any OCF resource agents that didn't make it into the first supported release though.
>>>>>> 
>>>>>> http://blog.clusterlabs.org/blog/2013/pacemaker-and-rhel-6-dot-4/
>>>>> 
>>>>> Thanks, I'll give that a read. All the resource agents are custom so I'm thinking I'm okay (I'll back them up before upgrading). 
>>>>> 
>>>>> One last question related to the fence_ec2 script. Should crm_mon -VW show it running on both nodes or just one?
>>>> 
>>>> I just went through the upgrade to pacemaker 1.1.10 and pcs. After running the yum update for those I ran a crm_verify and I'm seeing errors related to my order and colocation constraints. Did the behavior of these change from 1.1.8 to 1.1.10?
>>>> 
>>>> # crm_verify -L -V
>>>> error: unpack_order_template:        Invalid constraint 'order-ClusterEIP_54.215.143.166-Varnish-mandatory': No resource or template named 'Varnish'
>>> 
>>> Is that true?
>> 
>> No, it's not. The resource exists and the script for the resource exists.
>> 
>> I rolled back to 1.1.8 and the cluster started up without issue.
> 
> Can you send us your config? (cibadmin -Ql)
> 
> Is Varnish in a group or cloned?  That might also explain things.

The cibadmin output is attached.

Yes the varnish resources are in a group which is then cloned.

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> 
>> 
>>> 
>>>> error: unpack_order_template:        Invalid constraint 'order-Varnish-Varnishlog-mandatory': No resource or template named 'Varnish'
>>>> error: unpack_order_template:        Invalid constraint 'order-Varnishlog-Varnishncsa-mandatory': No resource or template named 'Varnishlog'
>>>> error: unpack_colocation_template:   Invalid constraint 'colocation-Varnish-ClusterEIP_54.215.143.166-INFINITY': No resource or template named 'Varnish'
>>>> error: unpack_colocation_template:   Invalid constraint 'colocation-Varnishlog-Varnish-INFINITY': No resource or template named 'Varnishlog'
>>>> error: unpack_colocation_template:   Invalid constraint 'colocation-Varnishncsa-Varnishlog-INFINITY': No resource or template named 'Varnishncsa'
>>>> Errors found during check: config not valid
>>>> 
>>>> The cluster doesn't start. I'd prefer to figure out how to fix this rather than roll back to 1.1.8. Any help is appreciated.
>>>> 
>>>> Thanks
>>>> 
>>>>> 
>>>>>> 
>>>>>>> 
>>>>>>>> 
>>>>>>>>> 
>>>>>>>>> I may have to go back to the drawing board on a fencing device for the nodes. Are there any other recommendations for a cluster on EC2 nodes?
>>>>>>>>> 
>>>>>>>>> Thanks very much
>>>>>>>>> 
>>>>>>>>>> 
>>>>>>>>>>> 
>>>>>>>>>>> # pcs status
>>>>>>>>>>> Last updated: Thu Nov  7 17:41:21 2013
>>>>>>>>>>> Last change: Thu Nov  7 04:29:06 2013 via cibadmin on ip-10-50-3-122
>>>>>>>>>>> Stack: cman
>>>>>>>>>>> Current DC: ip-10-50-3-122 - partition with quorum
>>>>>>>>>>> Version: 1.1.8-7.el6-394e906
>>>>>>>>>>> 3 Nodes configured, unknown expected votes
>>>>>>>>>>> 11 Resources configured.
>>>>>>>>>>> 
>>>>>>>>>>> 
>>>>>>>>>>> Node ip-10-50-3-1251: UNCLEAN (offline)
>>>>>>>>>>> Online: [ ip-10-50-3-122 ip-10-50-3-251 ]
>>>>>>>>>>> 
>>>>>>>>>>> Full list of resources:
>>>>>>>>>>> 
>>>>>>>>>>> ClusterEIP_54.215.143.166      (ocf::pacemaker:EIP):   Started ip-10-50-3-122
>>>>>>>>>>> Clone Set: EIP-AND-VARNISH-clone [EIP-AND-VARNISH]
>>>>>>>>>>> Started: [ ip-10-50-3-122 ip-10-50-3-251 ]
>>>>>>>>>>> Stopped: [ EIP-AND-VARNISH:2 ]
>>>>>>>>>>> ec2-fencing    (stonith:fence_ec2):    Stopped 
>>>>>>>>>>> 
>>>>>>>>>>> I have no idea where the node that is marked UNCLEAN came from, though it's a clear typo is a proper cluster node.
>>>>>>>>>>> 
>>>>>>>>>>> The only command I ran with the bad node ID was:
>>>>>>>>>>> 
>>>>>>>>>>> # crm_resource --resource ClusterEIP_54.215.143.166 --cleanup --node ip-10-50-3-1251
>>>>>>>>>>> 
>>>>>>>>>>> Is there any possible way that could have caused the the node to be added?
>>>>>>>>>>> 
>>>>>>>>>>> I tried running pcs cluster node remove ip-10-50-3-1251 but since there is no node and thus no pcsd that failed. Is there a way I can safely remove this ghost node from the cluster? I can provide logs from pacemaker or corosync as needed.
>>>>>>>>>>> _______________________________________________
>>>>>>>>>>> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
>>>>>>>>>>> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>>>>>>>>>>> 
>>>>>>>>>>> Project Home: http://www.clusterlabs.org
>>>>>>>>>>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
>>>>>>>>>>> Bugs: http://bugs.clusterlabs.org
>>>>>>>>>> 
>>>>>>>>>> 
>>>>>>>>>> _______________________________________________
>>>>>>>>>> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
>>>>>>>>>> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>>>>>>>>>> 
>>>>>>>>>> Project Home: http://www.clusterlabs.org
>>>>>>>>>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
>>>>>>>>>> Bugs: http://bugs.clusterlabs.org
>>>>>>>>> 
>>>>>>>>> _______________________________________________
>>>>>>>>> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
>>>>>>>>> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>>>>>>>>> 
>>>>>>>>> Project Home: http://www.clusterlabs.org
>>>>>>>>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
>>>>>>>>> Bugs: http://bugs.clusterlabs.org
>>>>>>>> 
>>>>>>>> 
>>>>>>>> _______________________________________________
>>>>>>>> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
>>>>>>>> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>>>>>>>> 
>>>>>>>> Project Home: http://www.clusterlabs.org
>>>>>>>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
>>>>>>>> Bugs: http://bugs.clusterlabs.org
>>>>>>> 
>>>>>>> _______________________________________________
>>>>>>> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
>>>>>>> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>>>>>>> 
>>>>>>> Project Home: http://www.clusterlabs.org
>>>>>>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
>>>>>>> Bugs: http://bugs.clusterlabs.org
>>>>>> 
>>>>>> 
>>>>>> _______________________________________________
>>>>>> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
>>>>>> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>>>>>> 
>>>>>> Project Home: http://www.clusterlabs.org
>>>>>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
>>>>>> Bugs: http://bugs.clusterlabs.org
>>>>> 
>>>>> _______________________________________________
>>>>> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
>>>>> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>>>>> 
>>>>> Project Home: http://www.clusterlabs.org
>>>>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
>>>>> Bugs: http://bugs.clusterlabs.org
>>>> 
>>>> _______________________________________________
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>>>> 
>>>> Project Home: http://www.clusterlabs.org
>>>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
>>>> Bugs: http://bugs.clusterlabs.org
>>> 
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>>> 
>>> Project Home: http://www.clusterlabs.org
>>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
>>> Bugs: http://bugs.clusterlabs.org
>> 
>> _______________________________________________
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>> 
>> Project Home: http://www.clusterlabs.org
>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
>> Bugs: http://bugs.clusterlabs.org
> 
> _______________________________________________
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> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
> 
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> Bugs: http://bugs.clusterlabs.org

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