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

Michael Szilagyi mszilagyi at gmail.com
Fri Aug 12 19:53:33 EDT 2011

I'm new to Pacemaker and trying to understand exactly what it can and can't

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

Here's an output of my crm configure show:

node $id="7deca2cd-9a64-476c-8ea2-372bca859a4f" four \
node $id="9b355ab7-8c81-485c-8dcd-1facedde5d03" three \
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="" \
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" \


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