[ClusterLabs] [EXTERNAL] Users Digest, Vol 55, Issue 19
Michael Powell
Michael.Powell at harmonicinc.com
Mon Aug 12 17:17:36 EDT 2019
Yes, I have tried that. I used crm_resource --meta -p resource-stickiness -v 0 -r SS16201289RN00023 to disable resource stickiness and then kill -9 <pid> to kill the application associated with the master resource. The results are the same: the slave resource remains a slave while the failed resource is restarted and becomes master again.
One approach that seems to work is to run crm_resource -M -r ms-SS16201289RN00023 -H mgraid-16201289RN00023-1 to move the resource to the other node (assuming that the master is running on node mgraid-16201289RN00023-0.) My original understanding was that this would "restart" the resource on the destination node, but that was apparently a misunderstanding. I can change our scripts to use this approach, but a) thought that maintain the approach of demoting the master resource and promoting the slave to master was more generic and b) I am unsure of any potential side effects of moving the resource. Given what I'm trying to accomplish, is this in fact the preferred approach?
Regards,
Michael
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Today's Topics:
1. why is node fenced ? (Lentes, Bernd)
2. Postgres HA - pacemaker RA do not support auto failback (Shital A)
3. Re: why is node fenced ? (Chris Walker)
4. Re: Master/slave failover does not work as expected
(Andrei Borzenkov)
----------------------------------------------------------------------
Message: 1
Date: Mon, 12 Aug 2019 18:09:24 +0200 (CEST)
From: "Lentes, Bernd" <bernd.lentes at helmholtz-muenchen.de<mailto:bernd.lentes at helmholtz-muenchen.de>>
To: Pacemaker ML <users at clusterlabs.org<mailto:users at clusterlabs.org>>
Subject: [ClusterLabs] why is node fenced ?
Message-ID:
<546330844.1686419.1565626164456.JavaMail.zimbra at helmholtz-muenchen.de<mailto:546330844.1686419.1565626164456.JavaMail.zimbra at helmholtz-muenchen.de>>
Content-Type: text/plain; charset=utf-8
Hi,
last Friday (9th of August) i had to install patches on my two-node cluster.
I put one of the nodes (ha-idg-2) into standby (crm node standby ha-idg-2), patched it, rebooted, started the cluster (systemctl start pacemaker) again, put the node again online, everything fine.
Then i wanted to do the same procedure with the other node (ha-idg-1).
I put it in standby, patched it, rebooted, started pacemaker again.
But then ha-idg-1 fenced ha-idg-2, it said the node is unclean.
I know that nodes which are unclean need to be shutdown, that's logical.
But i don't know from where the conclusion comes that the node is unclean respectively why it is unclean, i searched in the logs and didn't find any hint.
I put the syslog and the pacemaker log on a seafile share, i'd be very thankful if you'll have a look.
https://hmgubox.helmholtz-muenchen.de/d/53a10960932445fb9cfe/
Here the cli history of the commands:
17:03:04 crm node standby ha-idg-2
17:07:15 zypper up (install Updates on ha-idg-2)
17:17:30 systemctl reboot
17:25:21 systemctl start pacemaker.service
17:25:47 crm node online ha-idg-2
17:26:35 crm node standby ha-idg1-
17:30:21 zypper up (install Updates on ha-idg-1)
17:37:32 systemctl reboot
17:43:04 systemctl start pacemaker.service
17:44:00 ha-idg-1 is fenced
Thanks.
Bernd
OS is SLES 12 SP4, pacemaker 1.1.19, corosync 2.3.6-9.13.1
--
Bernd Lentes
Systemadministration
Institut f?r Entwicklungsgenetik
Geb?ude 35.34 - Raum 208
HelmholtzZentrum m?nchen
bernd.lentes at helmholtz-muenchen.de<mailto:bernd.lentes at helmholtz-muenchen.de>
phone: +49 89 3187 1241
phone: +49 89 3187 3827
fax: +49 89 3187 2294
http://www.helmholtz-muenchen.de/idg
Perfekt ist wer keine Fehler macht
Also sind Tote perfekt
Helmholtz Zentrum Muenchen
Deutsches Forschungszentrum fuer Gesundheit und Umwelt (GmbH)
Ingolstaedter Landstr. 1
85764 Neuherberg
www.helmholtz-muenchen.de<http://www.helmholtz-muenchen.de>
Aufsichtsratsvorsitzende: MinDir'in Prof. Dr. Veronika von Messling
Geschaeftsfuehrung: Prof. Dr. med. Dr. h.c. Matthias Tschoep, Heinrich Bassler, Kerstin Guenther
Registergericht: Amtsgericht Muenchen HRB 6466
USt-IdNr: DE 129521671
------------------------------
Message: 2
Date: Mon, 12 Aug 2019 12:24:02 +0530
From: Shital A <brightuser2019 at gmail.com<mailto:brightuser2019 at gmail.com>>
To: pgsql-general at postgresql.com<mailto:pgsql-general at postgresql.com>, Users at clusterlabs.org<mailto:Users at clusterlabs.org>
Subject: [ClusterLabs] Postgres HA - pacemaker RA do not support auto
failback
Message-ID:
<CAMp7vw_KF2eM_Buh_fPbZNC9Z6PVvx+7rxjyMhfMcoZXuWGLKw at mail.gmail.com<mailto:CAMp7vw_KF2eM_Buh_fPbZNC9Z6PVvx+7rxjyMhfMcoZXuWGLKw at mail.gmail.com>>
Content-Type: text/plain; charset="utf-8"
Hello,
Postgres version : 9.6
OS:Rhel 7.6
We are working on HA setup for postgres cluster of two nodes in
active-passive mode.
Installed:
Pacemaker 1.1.19
Corosync 2.4.3
The pacemaker agent with this installation doesn't support automatic
failback. What I mean by that is explained below:
1. Cluster is setup like A - B with A as master.
2. Kill services on A, node B will come up as master.
3. node A is ready to join the cluster, we have to delete the lock file it
creates on any one of the node and execute the cleanup command to get the
node back as standby
Step 3 is manual so HA is not achieved in real sense.
Please help to check:
1. Is there any version of the resouce agent which supports automatic
failback? To avoid generation of lock file and deleting it.
2. If there is no such support, if we need such functionality, do we have
to modify existing code?
How this can be achieved. Please suggest.
Thanks.
Thanks.
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Message: 3
Date: Mon, 12 Aug 2019 17:47:02 +0000
From: Chris Walker <cwalker at cray.com<mailto:cwalker at cray.com>>
To: Cluster Labs - All topics related to open-source clustering
welcomed <users at clusterlabs.org<mailto:users at clusterlabs.org>>
Subject: Re: [ClusterLabs] why is node fenced ?
Message-ID: <EAFEF777-5A49-4C06-A2F6-8711F528B4B6 at cray.com<mailto:EAFEF777-5A49-4C06-A2F6-8711F528B4B6 at cray.com>>
Content-Type: text/plain; charset="utf-8"
When ha-idg-1 started Pacemaker around 17:43, it did not see ha-idg-2, for example,
Aug 09 17:43:05 [6318] ha-idg-1 pacemakerd: info: pcmk_quorum_notification: Quorum retained | membership=1320 members=1
after ~20s (dc-deadtime parameter), ha-idg-2 is marked 'unclean' and STONITHed as part of startup fencing.
There is nothing in ha-idg-2's HA logs around 17:43 indicating that it saw ha-idg-1 either, so it appears that there was no communication at all between the two nodes.
I'm not sure exactly why the nodes did not see one another, but there are indications of network issues around this time
2019-08-09T17:42:16.427947+02:00 ha-idg-2 kernel: [ 1229.245533] bond1: now running without any active interface!
so perhaps that's related.
HTH,
Chris
?On 8/12/19, 12:09 PM, "Users on behalf of Lentes, Bernd" <users-bounces at clusterlabs.org on behalf of bernd.lentes at helmholtz-muenchen.de<mailto:users-bounces at clusterlabs.org%20on%20behalf%20of%20bernd.lentes at helmholtz-muenchen.de>> wrote:
Hi,
last Friday (9th of August) i had to install patches on my two-node cluster.
I put one of the nodes (ha-idg-2) into standby (crm node standby ha-idg-2), patched it, rebooted,
started the cluster (systemctl start pacemaker) again, put the node again online, everything fine.
Then i wanted to do the same procedure with the other node (ha-idg-1).
I put it in standby, patched it, rebooted, started pacemaker again.
But then ha-idg-1 fenced ha-idg-2, it said the node is unclean.
I know that nodes which are unclean need to be shutdown, that's logical.
But i don't know from where the conclusion comes that the node is unclean respectively why it is unclean,
i searched in the logs and didn't find any hint.
I put the syslog and the pacemaker log on a seafile share, i'd be very thankful if you'll have a look.
https://hmgubox.helmholtz-muenchen.de/d/53a10960932445fb9cfe/
Here the cli history of the commands:
17:03:04 crm node standby ha-idg-2
17:07:15 zypper up (install Updates on ha-idg-2)
17:17:30 systemctl reboot
17:25:21 systemctl start pacemaker.service
17:25:47 crm node online ha-idg-2
17:26:35 crm node standby ha-idg1-
17:30:21 zypper up (install Updates on ha-idg-1)
17:37:32 systemctl reboot
17:43:04 systemctl start pacemaker.service
17:44:00 ha-idg-1 is fenced
Thanks.
Bernd
OS is SLES 12 SP4, pacemaker 1.1.19, corosync 2.3.6-9.13.1
--
Bernd Lentes
Systemadministration
Institut f?r Entwicklungsgenetik
Geb?ude 35.34 - Raum 208
HelmholtzZentrum m?nchen
bernd.lentes at helmholtz-muenchen.de<mailto:bernd.lentes at helmholtz-muenchen.de>
phone: +49 89 3187 1241
phone: +49 89 3187 3827
fax: +49 89 3187 2294
http://www.helmholtz-muenchen.de/idg
Perfekt ist wer keine Fehler macht
Also sind Tote perfekt
Helmholtz Zentrum Muenchen
Deutsches Forschungszentrum fuer Gesundheit und Umwelt (GmbH)
Ingolstaedter Landstr. 1
85764 Neuherberg
www.helmholtz-muenchen.de<http://www.helmholtz-muenchen.de>
Aufsichtsratsvorsitzende: MinDir'in Prof. Dr. Veronika von Messling
Geschaeftsfuehrung: Prof. Dr. med. Dr. h.c. Matthias Tschoep, Heinrich Bassler, Kerstin Guenther
Registergericht: Amtsgericht Muenchen HRB 6466
USt-IdNr: DE 129521671
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------------------------------
Message: 4
Date: Mon, 12 Aug 2019 23:09:31 +0300
From: Andrei Borzenkov <arvidjaar at gmail.com<mailto:arvidjaar at gmail.com>>
To: Cluster Labs - All topics related to open-source clustering
welcomed <users at clusterlabs.org<mailto:users at clusterlabs.org>>
Cc: Venkata Reddy Chappavarapu <Venkata.Chappavarapu at harmonicinc.com<mailto:Venkata.Chappavarapu at harmonicinc.com>>
Subject: Re: [ClusterLabs] Master/slave failover does not work as
expected
Message-ID:
<CAA91j0WxSxt_eVmUvXgJ_0goBkBw69r3o-VesRvGc6atg6o=jQ at mail.gmail.com<mailto:CAA91j0WxSxt_eVmUvXgJ_0goBkBw69r3o-VesRvGc6atg6o=jQ at mail.gmail.com>>
Content-Type: text/plain; charset="utf-8"
On Mon, Aug 12, 2019 at 4:12 PM Michael Powell <
Michael.Powell at harmonicinc.com<mailto:Michael.Powell at harmonicinc.com>> wrote:
> At 07:44:49, the ss agent discovers that the master instance has failed on
> node *mgraid?-0* as a result of a failed *ssadm* request in response to
> an *ss_monitor()* operation. It issues a *crm_master -Q -D* command with
> the intent of demoting the master and promoting the slave, on the other
> node, to master. The *ss_demote()* function finds that the application
> is no longer running and returns *OCF_NOT_RUNNING* (7). In the older
> product, this was sufficient to promote the other instance to master, but
> in the current product, that does not happen. Currently, the failed
> application is restarted, as expected, and is promoted to master, but this
> takes 10?s of seconds.
>
>
>
Did you try to disable resource stickiness for this ms?
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