Managing HP Serviceguard for Linux Ninth Edition, April 2009

IMPORTANT: For detailed information and examples, see the cmeval (1m) manpage.
Reconfiguring a Halted Cluster
You can make a permanent change in cluster configuration when the cluster is halted.
This procedure must be used for changes marked “Cluster must not be running” in
Table 7-1, but it can be used for any other cluster configuration changes as well.
Use the following steps:
1. Halt the cluster on all nodes.
2. On one node, reconfigure the cluster as described in “Building an HA Cluster
Configuration” (page 147). You can use cmgetconf to generate a template file,
which you then edit.
3. Make sure that all nodes listed in the cluster configuration file are powered up
and accessible. Use cmapplyconf to copy the binary cluster configuration file to
all nodes. This file overwrites any previous version of the binary cluster
configuration file.
4. Use cmruncl to start the cluster on all nodes, or on a subset of nodes.
Reconfiguring a Running Cluster
You can add new nodes to the cluster configuration or delete nodes from the cluster
configuration while the cluster is up and running. Note the following, however:
• You cannot remove an active node from the cluster. You must halt the node first.
• The only configuration change allowed while a node is unreachable (for example,
completely disconnected from the network) is to delete the unreachable node from
the cluster configuration. If there are also packages that depend upon that node,
the package configuration must also be modified to delete the node. This all must
be done in one configuration request (cmapplyconf command).
• The access control list for the cluster can be changed while the cluster is running.
Changes to the package configuration are described in a later section.
The following sections describe how to perform dynamic reconfiguration tasks.
Adding Nodes to the Configuration While the Cluster is Running
Use the following procedure to add a node. For this example, nodes ftsys8 and
ftsys9 are already configured in a running cluster named cluster1, and you are
adding node ftsys10.
Reconfiguring a Cluster 245