[Pacemaker] Question about Pacemaker master/slave and mysql replication

[Dan Frincu]

Hi,

On Sat, Aug 13, 2011 at 2:53 AM, Michael Szilagyi <mszilagyi at gmail.com> wrote:
> I'm new to Pacemaker and trying to understand exactly what it can and can't
> do.
> I currently have a small, mysql master/slave cluster setup that is getting
> monitored within Heartbeat/Pacemaker:  What I'd like to be able to do (and
> am hoping Pacemaker will do) is to have 1 node designated as Master and in
> the event of a failure, automatically promote a slave to master and realign
> all of the existing slaves to be slaves of the newly promoted master.
>  Currently what seems to be happening, however, is heartbeat correctly sees
> that a node goes down and pacemaker promotes it up to master but the
> replication is not adjusted so that it is now feeding everyone else.  It
> seems like this should be possible to do from within Pacemaker but I feel
> like I'm missing a part of the puzzle.  Any suggestions would be
> appreciated.

You could try the mysql RA => from
https://github.com/fghaas/resource-agents/blob/master/heartbeat/mysql
Last I heard, it had replication support.

HTH.

>
> Here's an output of my crm configure show:
> node $id="7deca2cd-9a64-476c-8ea2-372bca859a4f" four \
> attributes 172.17.0.130-log-file-p_sql="mysql-bin.000013"
> 172.17.0.130-log-pos-p_sql="632"
> node $id="9b355ab7-8c81-485c-8dcd-1facedde5d03" three \
> attributes 172.17.0.131-log-file-p_sql="mysql-bin.000020"
> 172.17.0.131-log-pos-p_sql="106"
> primitive p_sql ocf:heartbeat:mysql \
> params config="/etc/mysql/my.cnf" binary="/usr/bin/mysqld_safe"
> datadir="/var/lib/mysql" \
> params pid="/var/lib/mysql/novaSQL.pid" socket="/var/run/mysqld/mysqld.sock"
> \
> params max_slave_lag="120" \
> params replication_user="novaSlave" replication_passwd="nova" \
> params additional_parameters="--skip-external-locking
> --relay-log=novaSQL-relay-bin --relay-log-index=relay-bin.index
> --relay-log-info-file=relay-bin.info" \
> op start interval="0" timeout="120" \
> op stop interval="0" timeout="120" \
> op promote interval="0" timeout="120" \
> op demote interval="0" timeout="120" \
> op monitor interval="10" role="Master" timeout="30" \
> op monitor interval="30" role="Slave" timeout="30"
> primitive p_sqlIP ocf:heartbeat:IPaddr2 \
> params ip="172.17.0.96" \
> op monitor interval="10s"
> ms ms_sql p_sql \
> meta target-role="Started" is-managed="true"
> location l_sqlMaster p_sqlIP 10: three
> location l_sqlSlave1 p_sqlIP 5: four
> property $id="cib-bootstrap-options" \
> dc-version="1.0.9-unknown" \
> cluster-infrastructure="Heartbeat" \
> stonith-enabled="false" \
> no-quorum-policy="ignore" \
> last-lrm-refresh="1313187103"
>
> Thanks!
> -Mike.
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>
>



-- 
Dan Frincu
CCNA, RHCE