[ClusterLabs] 答复: No slave is promoted to be master

[范国腾]

Thank you very much, Rorthais,



I see now. I have two more questions.



1. If I change the "cluster-recheck-interval" parameter from the default 15 minutes to 10 seconds, is there any bad impact? Could this be a workaround?



2. This issue happens only in the following configuration.

[cid:image003.jpg at 01D3D700.2F3E24D0]

But it does not happen in the following configuration. Why is the behaviors different?

[cid:image004.jpg at 01D3D700.2F3E24D0]



-----邮件原件-----
发件人: Jehan-Guillaume de Rorthais [mailto:jgdr at dalibo.com]
发送时间: 2018年4月17日 17:47
收件人: 范国腾 <fanguoteng at highgo.com>
抄送: Cluster Labs - All topics related to open-source clustering welcomed <users at clusterlabs.org>
主题: Re: [ClusterLabs] No slave is promoted to be master



On Tue, 17 Apr 2018 04:16:38 +0000

范国腾 <fanguoteng at highgo.com<mailto:fanguoteng at highgo.com>> wrote:



> I check the status again. It is not not promoted but it promoted about

> 15 minutes after the cluster starts.

>

> I try in three labs and the results are same: The promotion happens 15

> minutes after the cluster starts.

>

> Why is there about 15 minutes delay every time?



This was a bug in Pacemaker up to 1.1.17. I did a report about this last August and Ken Gaillot fixed it few days later in 1.1.18. See:



https://lists.clusterlabs.org/pipermail/developers/2017-August/001110.html

https://lists.clusterlabs.org/pipermail/developers/2017-September/001113.html



I wonder if disabling the pgsql resource before shutting down the cluster might be a simpler and safer workaround. Eg.:



pcs resource disable pgsql-ha  --wait

pcs cluster stop --all



and



pcs cluster start --all

pcs resource enable pgsql-ha



Another fix would be to force a master score on one node **if needed** using:



  crm_master -N <node name> -r <resource_name> -l forever -v 1


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