[Pacemaker] Clone set members colocation

[Andreas Kurz]

Hello,

On 11/08/2011 10:42 PM, Yves Trudeau wrote:
> Hi,
>    I am currently working on a replication solution adding logic to the
> mysql RA and I need to be able to turn ON/OFF a virtual IP based on a
> node attribute (Florian suggestion).  In order to achieve this, I
> created a clone set of IPaddr2 RA and a location rule using the node
> attribute setting.  It works almost correctly except that clone members
> stick a bit too much and don't failback.  Here's my config:
> 
> node testvirtbox1 \
>         attributes IP="10.2.2.160"
> node testvirtbox2 \
>         attributes IP="10.2.2.161" \
>         attributes standby="off"
> node testvirtbox3 \
>         attributes IP="10.2.2.162" \
>         attributes standby="off"
> primitive reader_vip_1 ocf:heartbeat:IPaddr2 \
>         params ip="10.2.2.171" nic="eth0"
> clone reader_vips reader_vip_1 \
>         meta globally-unique="true" clone-max="3" clone-node-max="3"
> notify="true" ordered="true" interleave="true"
> location No-reader-vip-loc reader_vips \
>         rule $id="No-reader-vip-rule" -inf: readerOK eq 0
> colocation reader_vips_dislike_reader_vips -200: reader_vips reader_vips
> property $id="cib-bootstrap-options" \
>         dc-version="1.0.11-a15ead49e20f047e129882619ed075a65c1ebdfe" \
>         cluster-infrastructure="openais" \
>         expected-quorum-votes="3" \
>         stonith-enabled="false" \
>         no-quorum-policy="ignore"
> rsc_defaults $id="rsc-options" \
>         resource-stickiness="100"
> 
> 
> 
> - Upon startup, the reader_vips clone are well spread on all 3 nodes
> - Running "crm_attribute -N testvirtbox1 -l reboot --name readerOK -s
> mysql_replication -v '0'"  removes the clone set member from
> testvirtbox1 as expected and add it to testvirtbox2 or testvirtbox3
> - But... running "crm_attribute -N testvirtbox1 -l reboot --name
> readerOK -s mysql_replication -v '1'" does not make it come back, one of
> the other node still have 2 clone members
> 
> Is there a way to make it come back normally or is there something I
> don't do correctly?

You can expand your location constraint with a rule to add a score of
200 if "readerOK eq 1" to override stickiness ... and you might also
want to check if the attribute is already defined.

Regards,
Andreas

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> 
> Regards,
> 
> Yves
> 
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