Sun Microsystems Netscape Enterprise Server, Руководство администратора

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Chapter 6, Managing Server Clusters 151
Preliminary Guidelines for Using Server Clusters
then you’ll need to configure one single cluster’s administration server as the
master Enterprise Administration Server for all clusters. It doesn’t matter which
server you choose as the master administration server.
The following list provides some guidelines for configuring groups of servers
into clusters:
• Install all of the servers you want to include in a particular cluster prior to
creating any clusters.
• All servers in a cluster must be Enterprise Servers.
• Servers can be installed on any computer in a network, but the “master”
Enterprise Administration Server containing information about the clusters
must have access to each cluster-specific Enterprise Administration Server.
• Any cluster-specific Enterprise Administration Server can serve as the master
administration server.
• The master Enterprise Administration Server retrieves information about all
installed Enterprise Servers.
• Make sure all cluster-specific Enterprise Administration Servers have a
username and password that matches one used in the master administration
server. You can use the distributed administration feature to set up multiple
administrators on each Enterprise Administration Server. For more
information about distributed administration, see “Enabling Distributed
Administration,” on page 71 in Chapter 3, “Setting Administration
Preferences.”
• Make sure all Enterprise Administration Server are version 4.0 and use the
same protocol (HTTP or HTTPS). You’ll get an error if you try to add a 3.x
Enterprise Server to a cluster, and if you add a 4.0 Enterprise Administration
Server that has 3.x servers, the 3.x servers are not added to the clusters.
• Clusters won’t work with 2.x Administration Servers.
• If you change the protocol of one Enterprise Administration Server in a
cluster, you must change the protocols for all Enterprise Administration
Servers, and then you need to update the cluster information by modifying
the individual servers in the cluster.
You can perform the following tasks for working with Netscape Enterprise
Server clusters: