Managing HP Serviceguard A.11.20.10 for Linux, December 2012

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.
7.6.3.1 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.
NOTE: Before you start, make sure you have configured access to ftsys10 as described under
“Configuring Root-Level Access” (page 130).
1. Use the following command to store a current copy of the existing cluster configuration in a
temporary file in case you need to revert to it:
cmgetconf -C temp.conf
2. Specify a new set of nodes to be configured and generate a template of the new configuration
(all on one line):
cmquerycl -C clconfig.conf -c cluster1 -n ftsys8 -n ftsys9 -n ftsys10
3. Edit clconfig.conf to check the information about the new node.
4. Verify the new configuration:
cmcheckconf -C clconfig.conf
5. Apply the changes to the configuration and send the new binary configuration file to all cluster
nodes:
cmapplyconf -C clconfig.conf
Use cmrunnode to start the new node, and, if you so decide, set the AUTOSTART_CMCLD
parameter to 1 in the $SGAUTOSTART file (see “Understanding the Location of Serviceguard Files”
(page 129)) to enable the new node to join the cluster automatically each time it reboots.
7.6.3.2 Removing Nodes from the Cluster while the Cluster Is Running
You can use Serviceguard Manager to delete nodes, or Serviceguard commands as shown below.
The following restrictions apply:
• The node must be halted. See “Removing Nodes from Participation in a Running Cluster”
(page 204).
• If the node you want to delete is unreachable (disconnected from the LAN, for example), you
can delete the node only if there are no packages which specify the unreachable node. If
there are packages that depend on the unreachable node, halt the cluster; see “Halting the
Entire Cluster ” (page 204).
Use the following procedure to delete a node with Serviceguard commands. In this example, nodes
ftsys8, ftsys9 and ftsys10 are already configured in a running cluster named cluster1,
and you are deleting node ftsys10.
NOTE: If you want to remove a node from the cluster, run the cmapplyconf command from
another node in the same cluster. If you try to issue the command on the node you want removed,
you will get an error message.
220 Cluster and Package Maintenance