Red Hat Training

A Red Hat training course is available for Red Hat Enterprise Linux

1.2. Cluster Creation

This procedure creates a Red Hat High Availability Add-On cluster that consists of the nodes z1.example.com and z2.example.com.
  1. Execute the following command from z1.example.com to create the two-node cluster my_cluster that consists of nodes z1.example.com and z2.example.com. This will propagate the cluster configuration files to both nodes in the cluster. This command includes the --start option, which will start the cluster services on both nodes in the cluster. 
    [root@z1 ~]# pcs cluster setup --start --name my_cluster \
z1.example.com z2.example.com
z1.example.com: Succeeded
z1.example.com: Starting Cluster...
z2.example.com: Succeeded
z2.example.com: Starting Cluster...
  2. Enable the cluster services to run on each node in the cluster when the node is booted.

    Note

    For your particular environment, you may choose to leave the cluster services disabled by skipping this step. This allows you to ensure that if a node goes down, any issues with your cluster or your resources are resolved before the node rejoins the cluster. If you leave the cluster services disabled, you will need to manually start the services when you reboot a node by executing the pcs cluster start command on that node. 
    [root@z1 ~]# pcs cluster enable --all
You can display the current status of the cluster with the pcs cluster status command. Because there may be a slight delay before the cluster is up and running when you start the cluster services with the --start option of the pcs cluster setup command, you should ensure that the cluster is up and running before performing any subsequent actions on the cluster and its configuration. 
[root@z1 ~]# pcs cluster status
Cluster Status:
 Last updated: Thu Jul 25 13:01:26 2013
 Last change: Thu Jul 25 13:04:45 2013 via crmd on z2.example.com
 Stack: corosync
 Current DC: z2.example.com (2) - partition with quorum
 Version: 1.1.10-5.el7-9abe687
 2 Nodes configured
 0 Resources configured