[ClusterLabs] Master/slave failover does not work as expected
Michael Powell
Michael.Powell at harmonicinc.com
Tue Aug 13 09:42:55 EDT 2019
Re: " Does slave have master score? Your logs show only one node with master. To select another node as new master it needs non-zero master score as well."
Yes, it does. I included the corosync.log file from the DC node earlier, but the corosync log file from the other node shows messages like the following:
Aug 13 05:59:50 [16795] mgraid-16201289RN00023-1 pengine: debug: master_color: SS16201289RN00023:1 master score: 500
Regards,
michael
-----Original Message-----
From: Users <users-bounces at clusterlabs.org> On Behalf Of users-request at clusterlabs.org
Sent: Monday, August 12, 2019 9:38 PM
To: users at clusterlabs.org
Subject: [EXTERNAL] Users Digest, Vol 55, Issue 24
Send Users mailing list submissions to
users at clusterlabs.org
To subscribe or unsubscribe via the World Wide Web, visit
https://lists.clusterlabs.org/mailman/listinfo/users
or, via email, send a message with subject or body 'help' to
users-request at clusterlabs.org
You can reach the person managing the list at
users-owner at clusterlabs.org
When replying, please edit your Subject line so it is more specific than "Re: Contents of Users digest..."
Today's Topics:
1. Re: [EXTERNAL] Users Digest, Vol 55, Issue 19 (Andrei Borzenkov)
----------------------------------------------------------------------
Message: 1
Date: Tue, 13 Aug 2019 07:37:47 +0300
From: Andrei Borzenkov <arvidjaar at gmail.com>
To: Cluster Labs - All topics related to open-source clustering
welcomed <users at clusterlabs.org>
Cc: Venkata Reddy Chappavarapu <Venkata.Chappavarapu at harmonicinc.com>
Subject: Re: [ClusterLabs] [EXTERNAL] Users Digest, Vol 55, Issue 19
Message-ID: <F7B3F2D1-95E8-4B65-AA72-4074B5944741 at gmail.com>
Content-Type: text/plain; charset="utf-8"
?????????? ? iPhone
> 13 ???. 2019 ?., ? 0:17, Michael Powell <Michael.Powell at harmonicinc.com> ???????(?):
>
> 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.
>
Does slave have master score? Your logs show only one node with master. To select another node as new master it needs non-zero master score as well.
> 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
>
>
> -----Original Message-----
> From: Users <users-bounces at clusterlabs.org> On Behalf Of
> users-request at clusterlabs.org
> Sent: Monday, August 12, 2019 1:10 PM
> To: users at clusterlabs.org
> Subject: [EXTERNAL] Users Digest, Vol 55, Issue 19
>
> Send Users mailing list submissions to
> users at clusterlabs.org
>
> To subscribe or unsubscribe via the World Wide Web, visit
> https://lists.clusterlabs.org/mailman/listinfo/users
> or, via email, send a message with subject or body 'help' to
> users-request at clusterlabs.org
>
> You can reach the person managing the list at
> users-owner at clusterlabs.org
>
> When replying, please edit your Subject line so it is more specific than "Re: Contents of Users digest..."
>
>
> 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>
> To: Pacemaker ML <users at clusterlabs.org>
> Subject: [ClusterLabs] why is node fenced ?
> Message-ID:
>
> <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
> 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
> 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>
> To: pgsql-general at postgresql.com, 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>
> 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.
> -------------- next part -------------- An HTML attachment was
> scrubbed...
> URL:
> <https://lists.clusterlabs.org/pipermail/users/attachments/20190812/73
> 7a010e/attachment-0001.html>
>
> ------------------------------
>
> Message: 3
> Date: Mon, 12 Aug 2019 17:47:02 +0000
> From: Chris Walker <cwalker at cray.com>
> To: Cluster Labs - All topics related to open-source clustering
> welcomed <users at clusterlabs.org>
> Subject: Re: [ClusterLabs] why is node fenced ?
> Message-ID: <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> 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
> 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
> 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
>
> _______________________________________________
> Manage your subscription:
> https://lists.clusterlabs.org/mailman/listinfo/users
>
> ClusterLabs home: https://www.clusterlabs.org/
>
>
> ------------------------------
>
> Message: 4
> Date: Mon, 12 Aug 2019 23:09:31 +0300
> From: Andrei Borzenkov <arvidjaar at gmail.com>
> To: Cluster Labs - All topics related to open-source clustering
> welcomed <users at clusterlabs.org>
> Cc: Venkata Reddy Chappavarapu <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>
> Content-Type: text/plain; charset="utf-8"
>
> On Mon, Aug 12, 2019 at 4:12 PM Michael Powell <
> 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?
> -------------- next part -------------- An HTML attachment was
> scrubbed...
> URL:
> <https://lists.clusterlabs.org/pipermail/users/attachments/20190812/12
> 978d55/attachment.html>
> -------------- next part -------------- A non-text attachment was
> scrubbed...
> Name: image001.gif
> Type: image/gif
> Size: 1854 bytes
> Desc: not available
> URL:
> <https://lists.clusterlabs.org/pipermail/users/attachments/20190812/12
> 978d55/attachment.gif>
>
> ------------------------------
>
> Subject: Digest Footer
>
> _______________________________________________
> Manage your subscription:
> https://lists.clusterlabs.org/mailman/listinfo/users
>
> ClusterLabs home: https://www.clusterlabs.org/
>
> ------------------------------
>
> End of Users Digest, Vol 55, Issue 19
> *************************************
> _______________________________________________
> Manage your subscription:
> https://lists.clusterlabs.org/mailman/listinfo/users
>
> ClusterLabs home: https://www.clusterlabs.org/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.clusterlabs.org/pipermail/users/attachments/20190813/6b477712/attachment.html>
------------------------------
Subject: Digest Footer
_______________________________________________
Manage your subscription:
https://lists.clusterlabs.org/mailman/listinfo/users
ClusterLabs home: https://www.clusterlabs.org/
------------------------------
End of Users Digest, Vol 55, Issue 24
*************************************
More information about the Users
mailing list