Pacemaker

Pacemaker provides a framework to manage the availability of resources. It's essentially the core component on a cluster that allows you to manage resource locations etc. 
 Installing 
 apt-get install pacemaker pcs resource-agents 
 yum install pacemaker pcs resource-agents 
 Configuration 
 Add all hosts related to the cluster to /etc/hosts (including the host you're on, also remove any reference to localhost/ 127.0.0.1) 
 
 Set password for hacluster user: 
 passwd hacluster 
 authorise the nodes to be included in the cluster: 
 pcs host auth node01.srv.world node02.srv.world 
 start services for cluster: 
 pcs cluster start --all 
 enable services: 
 pcs cluster enable --all 
 Verify installation is working and nodes are connected: 
 pcs cluster status

pcs status corosync 
 Deleting a cluster installation 
 pcs cluster stop --all

pcs cluster destroy --all