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Old 05-01-2007, 03:18 AM   #1
aix_tiger
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Registered: Mar 2007
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Unhappy How to configure fencing in RHEL cluster ?


Guys

I am currently configuring RHEL cluster and as this is my first time to configure RHEL cluster so i am facing few problems: I need you guys input an help.

1. My first question is about fencing, I have configured HP ILO for both of the cluster nodes. But while configuraing these fence devices for nodes in cluster configuration tool , i am confused. Should i place both fence devices(comil01 & comilo2) in same fence level and assign this fence level to both cluster nodes.OR i should create two fence levels ( each with one fence device ) and then assign these levels to each node.

2. How i can create a ethernet based heartbeat channel between the cluster nodes. I have two nodes comm1 with ip address of 172.16.2.182 and comm2 with ip address of 172.16.2.183.Should i place a cross cable between the other interface available on the nodes and put ip like 192.168.10.1 & 192.168.10.2 on them . Then how can tell my cluster to use this ethernet link as heartbeat between the nodes?

Please advice as i am a newbie for this sort of cluster configuration on RHEL

Best Regards

Polani
 
Old 06-11-2007, 03:59 AM   #2
brianmcgee
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Registered: Jun 2007
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First of all I do not recommend the GUI system-config-cluster for complex cluster configurations. Editing /etc/cluster/cluster.conf is easier and safer.

With the fence level settings you simply adjust the priority of the fencing agents. You can place your fencing agent on level 1 on both nodes. It is wise to add an additional fence level at least for fence manual.

Productive environments should use more than one fencing agent to avoid a single point of failure.

Your desired heartbeat network can be configured with changes to the /etc/hosts file. You should add the 192.168.10.x IPs and choose a descriptive name for them. That name then should be used in the cluster.conf for the hostname of the cluster nodes.

The heartbeating will resolve the correct IP address with /etc/hosts and select the right interface for communication.

Both NICs can be connected with a crossover cable.

Last edited by brianmcgee; 06-11-2007 at 04:02 AM.
 
  


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