Archive for March, 2011

Creating a Red Hat Cluster: Part 3

March 19th, 2011 6 comments

Here is the third of a series of article describing how to create a Linux Red Hat/CentOS cluster. At the end of this article, we will have a working cluster, all that will be left to do is the creation of the GFS filesystem and the scripts that will stop, start and give a status of our ftp and web services. You can refer to “Part1 , “Part 2” and our network diagram before reading this article, but for now let’s move on and continue our journey into building our cluster.

Defining the fencing devices

The fencing device is use by the cluster software to power-off the node when it is considered in problem. We need to define a fencing device for all the nodes that we defined in the previous article.

In our cluster, the fencing device used is the HP ILO interface. Select “the “HP ILO Device” from the pull down menu and enter the device information needed to connect to it. If you would like to see what are the fencing device supported by Red Hat cluster, you can consult the fencing FAQ on this page.

You could use manual fence for testing purpose but it is not supported in a production environment, since manual intervention is required to fence a server.

  • We choose to prefix the fencing device name with a lowercase “f_”, followed by the name assigned to its IP in /etc/hosts.
  • The login name to access the device.
  • The password used to authenticate to the device.
  • The host name as defined is our host file used to connect to the device.


Repeat the operation for each server in the cluster.











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Categories: Cluster