[Pacemaker] unexpected demote request on master

[K Mehta]

What I understand from "globally-unique=false" is as follows
Agent handling the resource does exactly same processing on all nodes. For
processing this resource, agent on all nodes will use exactly same
resources (files, processes, same parameters to agent entry points, etc).

In case of my resource, agent on all nodes execute same "command" to find
score.
Driver present on all nodes will make sure that the node that is to be
promoted is the one that reports highest score as output of the "command".
Score is reported to CM using ( /usr/sbin/crm_master -Q -l reboot -v
$score) in monitor entry point. Until this score
is reported, agent on other node will just delete the score
using /usr/sbin/crm_master -Q -l reboot -D in monitor entry point




I want to make sure that the resource does not run on nodes other than
$node1 and $node2. To achieve this i use the following commands.

        pcs -f $CLUSTER_CREATE_LOG constraint  location vha-${uuid}
 prefers $node1
        pcs -f $CLUSTER_CREATE_LOG constraint  location vha-${uuid}
 prefers $node2
        pcs -f $CLUSTER_CREATE_LOG constraint  location ms-${uuid}  prefers
$node1
        pcs -f $CLUSTER_CREATE_LOG constraint  location ms-${uuid}  prefers
$node2

Any issue here ?

Regards,
 Kiran



On Mon, May 26, 2014 at 8:54 AM, Andrew Beekhof <andrew at beekhof.net> wrote:

>
> On 22 May 2014, at 11:20 pm, K Mehta <kiranmehta1981 at gmail.com> wrote:
>
> > > May 13 01:38:36 vsanqa28 pengine[4310]:   notice: LogActions: Promote
> vha-924bf029-93a2-41a0-adcf-f1c1a42956e5:0#011(Slave -> Master vsanqa28)
> > > May 13 01:38:36 vsanqa28 pengine[4310]:   notice: LogActions: Demote
>  vha-924bf029-93a2-41a0-adcf-f1c1a42956e5:1#011(Master -> Slave vsanqa27)
>  <<<<< Why did this happen ?
> >
> > attach the file mentioned on the next line and we might be able to find
> out
> >
>
> Quick question, do you understand what globally-unique=false means and are
> you sure you want it?
> If the answer is 'yes and yes', are you sure that your agent is using
> crm_master correctly?
>
> If I run, 'tools/crm_simulate -Sx ~/Downloads/pe-input-818.bz2 -s | grep
> vha-924bf029-93a2-41a0-adcf-f1c1a42956e5', I see:
>
> vha-924bf029-93a2-41a0-adcf-f1c1a42956e5:0 promotion score on vsanqa28:
> INFINITY
> vha-924bf029-93a2-41a0-adcf-f1c1a42956e5:1 promotion score on vsanqa27: 2
>
>
> Although much of the 'INFINITY' is probably from:
>
>       <rsc_location
> id="location-ms-924bf029-93a2-41a0-adcf-f1c1a42956e5-vsanqa28-INFINITY"
> node="vsanqa28" rsc="ms-924bf029-93a2-41a0-adcf-f1c1a42956e5"
> score="INFINITY"/>
>
> This is somewhat odd to include for a clone/master resource.
>
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