Setting up the cluster machines

  To set up an HTTP server cluster using Load Balancer Dispatcher:

1. Ensure that the Load Balancer server and the HTTP servers are on the same LAN segment.

2. Ensure that the Load Balancer server can ping the Web servers.

3. Ensure that each HTTP server is operational.

4. Allocate a network address for the cluster, such as www.itso.ibm.com. This is the address that the browser will point to in order to access the site (http://www.itso.ibm.com).

5. Save a map of the routing tables of the HTTP server machines for later reference. Use the commands netstat -ar on UNIX or route print on Windows, redirecting the output to a file.

6. Add an alias to the loopback interface on the clustered HTTP servers. On AIX, use the command:

   ifconfig lo0 alias www.itso.ibm.com netmask 255.255.0.0

7. Check the routing table and delete any extra routes to your network. An AIX example would be:

   route delete -net network_address cluster_address

8. On each HTTP server, check that you can ping the alias address.

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