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yum install rgmanager lvm2-cluster gfs2-utils

Note that installing only the rgmanager will pull in all necessary dependencies to create an HA cluster from the HighAvailability channel. The lvm2-cluster and gfs2-utils packages are part of ResilientStorage channel and may not be needed by your site.
On both nodes install:

yum groupinstall 'High Availability' 'Resilient Storage'

On main web management server

yum install luci

On both nodes:

# service ricci start
Starting system message bus:                               [  OK  ]
Starting oddjobd:                                          [  OK  ]
generating SSL certificates...  done
Generating NSS database...  done
Starting ricci:                                            [  OK  ]

]# passwd ricci
Changing password for user ricci.
New password:
Retype new password:
passwd: all authentication tokens updated successfully.

On main node:

# service luci start
Adding following auto-detected host IDs (IP addresses/domain names), corresponding to `mysql-cluster-1' address, to the configuration of self-managed certificate `/var/lib/luci/etc/cacert.config' (you can change them by editing `/var/lib/luci/etc/cacert.config', removing the generated certificate `/var/lib/luci/certs/host.pem' and restarting luci):
        (none suitable found, you can still do it manually as mentioned above)

Generating a 2048 bit RSA private key
writing new private key to '/var/lib/luci/certs/host.pem'
Start luci...                                              [  OK  ]
Point your web browser to https://mysql-cluster-1:8084 (or equivalent) to access luci

In your browser go to the following address and log in using the servers root account:

https://x.x.x.x:8084