RSINFOMINDS: 21 Feb 2014

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Friday, 21 February 2014

Add a node to a 2 Node Cluster : RHEL

[root@node1 ~]# clustat
Cluster Status for oracle @ Thu Feb 20 00:56:32 2014
Member Status: Quorate

Member Name ID Status
------ ---- ---- ------
node1 1 Online, Local
node2 2 Online

[root@node1 ~]#

[root@node2 ~]# clustat
Cluster Status for oracle @ Mon Feb 17 07:20:55 2014
Member Status: Quorate

Member Name ID Status
------ ---- ---- ------
node1 1 Online
node2 2 Online, Local

[root@node2 ~]#

I am going to add a new node called "node3". This can be done from LUCI or CLI.

From the primary node, update the cluster.conf

[root@node1 ~]# vi /etc/cluster/cluster.conf
[root@node1 ~]# cat /etc/cluster/cluster.conf
<?xml version="1.0"?>
<cluster config_version="15" name="oracle">
<clusternodes>
<clusternode name="node1" nodeid="1"/>
<clusternode name="node2" nodeid="2"/>
<clusternode name="node3" nodeid="3"/>
</clusternodes>

[root@node1 ~]# cman_tool version -r
[root@node1 ~]# clustat
Cluster Status for oracle @ Thu Feb 20 01:05:07 2014
Member Status: Quorate

Member Name ID Status
------ ---- ---- ------
node1 1 Online, Local
node2 2 Online
node3 3 Offline

[root@node1 ~]#

Now start the CMAN service on node3:

[root@node3 ~]# service cman start

Starting cluster:

Checking if cluster has been disabled at boot... [ OK ]

Checking Network Manager... [ OK ]

Global setup... [ OK ]

Loading kernel modules... [ OK ]

Mounting configfs... [ OK ]

Starting cman... [ OK ]

Waiting for quorum... [ OK ]

Starting fenced... [ OK ]

Starting dlm_controld... [ OK ]

Starting gfs_controld... [ OK ]

Unfencing self... [ OK ]

Joining fence domain... [ OK ]

[root@node3 ~]#

[root@node3 ~]# clustat

Cluster Status for oracle @ Wed Feb 19 08:52:40 2014

Member Status: Quorate

Member Name ID Status

------ ---- ---- ------

node1 1 Online

node2 2 Online

node3 3 Online, Local

[root@node3 ~]#

Simple ...:)