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

[Ken Gaillot]

On Wed, 2018-04-18 at 02:33 +0000, 范国腾 wrote:
> 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?

Personally I wouldn't lower it below 5 minutes. The policy engine will
run at least this often, so setting it very low means the PE will run
continuously, putting unnecessary CPU and I/O load on the cluster.

>  
> 2. This issue happens only in the following configuration.
> 
> But it does not happen in the following configuration. Why is the
> behaviors different?

I'm not sure. I don't know of any differences in those two versions (or
two-node vs. three-node) that would affect this issue.

> -----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> 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/001
> 113.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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-- 
Ken Gaillot <kgaillot at redhat.com>