Apache Tomcat Cluster with Pacemaker on Cent OS 6

This is a two node Apache tomcat cluster with virtual IP 10.20.9.225

node1.example.com
node2.example.com

Add the following to the /etc/hosts file in both nodes so that they are able to reach each other

10.20.9.220       node1.example.com        node1
10.20.9.221       node2.example.com        node2


Now install the pre-requisites on both nodes

#yum install -y java-1.7.0-openjdk.x86_64 pcs pacemaker corosync cman wget

Download and extract Apache Tomcat

#cd /usr/local/
#wget http://apache.arvixe.com/tomcat/tomcat-6/v6.0.43/bin/apache-tomcat-6.0.43.tar.gz
#tar xvzf apache-tomcat-6.0.43.tar.gz

Now set password for the hacluster user on both nodes

#passwd hacluster

Now start pcsd service on both nodes and add it to startup

#service pcsd start
#chkconfig pcsd on

Now authorize the cluster nodes. Will ask for username and password. Use "hacluster"

#mkdir /etc/cluster
#pcs cluster auth node1 node2

Now create the cluster

#pcs cluster setup --name MYCLUSTER node1 node2
#pcs cluster start --all


Now disable STONITH and quorum as it is not required for a two node setup

#pcs property set stonith-enabled=false

#pcs property set no-quorum-policy=ignore

Now add the resources. We need a virtual IP and tomcat resource

#pcs resource create VirtualIP ocf:heartbeat:IPaddr2 ip=10.20.9.225 cidr_netmask=24  op monitor interval=30s

 #pcs resource create tomcat ocf:heartbeat:tomcat params java_home="/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.75.x86_64/jre" catalina_home="/usr/local/apache-tomcat-6.0.43" tomcat_user="root" op monitor interval="15s"

Now to make both resources run in the same node we must have a constraint as follows

# pcs constraint colocation set VirtualIP tomcat

All done. Now stop the cluster and start it.

#pcs cluster stop --all

#pcs cluster start --all

#pcs status

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