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Sun Java System Web Server 6.1 SP12 Administrator's Guide

Guidelines for Using Server Clusters

When you configure a cluster, the master Administration Server containing the information about all clusters communicates with each individual cluster’s Administration Server. The administration server for each cluster must use the same administration user name and password as that of the master Administration Server.

Before you can create a cluster, make sure that all the servers to be included in the cluster are installed. For example, if you want three clusters of five Sun Java System Web Servers per cluster, you need to:

  1. Install all the servers on the computers on which they run using the same administration user name and password as the master Administration Server.

  2. Configure one of the Sun Java System Web Servers in each cluster as the Administration Server.

  3. Configure one single cluster’s administration server as the master Administration Server for all clusters. It doesn’t matter which server you choose as the master administration server.

    Caution – Caution –

    Clusters can only be homogeneous. All servers in the cluster must be either UNIX or Windows. Combining UNIX and Windows servers in the same cluster may cause the server to hang or crash.

    The following list provides some guidelines for configuring groups of servers into clusters:

    • Install all the servers to be included in a particular cluster prior to creating any clusters.

    • Make sure all servers in a cluster are Sun Java System Web Servers version 6.1.

    • Make sure all cluster-specific Administration Servers have the same userid and password as the master administration server. You can use distributed administration to set up multiple administrators on each Administration Server.

    • Install the servers on any computer in a network, as long as all computers in the cluster are Windows or UNIX.

    • You can designate any cluster-specific Administration Server as the master administration server.

    • Make sure the master Administration Server has access to each cluster-specific Administration Server. The master Administration Server retrieves information about all installed Sun Java System Web Servers.

    • Make sure all the Administration Servers are Sun Java System Web Server version 6.0 or 6.1 and use the same protocol, HTTP or HTTPS. Only Sun Java System Web Server 6.0 or 6.1 servers are supported for addition to clusters.

    • If you change the protocol of one Administration Server in a cluster, you must change the protocols for all Administration Servers. Then use the Modify Server interface to modify the individual servers in the cluster.