Managing HP Serviceguard for Linux, Tenth Edition, September 2012

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 245).
• 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 246).
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.
1. Use the following command to store a current copy of the existing cluster
configuration in a temporary file:
cmgetconf -c cluster1 temp.conf
2. Specify the new set of nodes to be configured (omitting ftsys10) and generate a
template of the new configuration:
cmquerycl -C clconfig.conf -c cluster1 -n ftsys8 -n ftsys9
3. Edit the file clconfig.conf to check the information about the nodes that remain
in the cluster.
4. Halt the node you are going to remove (ftsys10in this example):
cmhaltnode -f -v ftsys10
5. Verify the new configuration:
cmcheckconf -C clconfig.conf
6. From ftsys8 or ftsys9, apply the changes to the configuration and distribute the
new binary configuration file to all cluster nodes.:
cmapplyconf -C clconfig.conf
266 Cluster and Package Maintenance