Managing HP Serviceguard for Linux, Seventh Edition, July 2007

Cluster and Package Maintenance
Reconfiguring a Cluster
Chapter 7 257
• You cannot delete a subnet or IP address from a node while a
package that uses it (as a monitored_subnet, ip_subnet, or
ip_address) is configured to run on that node.
See page 208 for more information about the package networking
parameters.
• You cannot change the IP configuration of an interface used by the
cluster in a single transaction (cmapplyconf).
You must first delete the NIC from the cluster configuration, then
reconfigure the NIC (using ifconfig, for example), then add the
NIC back into the cluster.
Examples of when you must do this include:
— moving a NIC from one subnet to another
— adding an IP address to a NIC
— removing an IP address from a NIC
Some sample procedures follow.
Example: Adding a Heartbeat LAN
Suppose that a subnet 15.13.170.0 is shared by nodes ftsys9 and
ftsys10 in a two-node cluster cluster1, and you want to add it to the
cluster configuration as a heartbeat subnet. Proceed as follows.
Step 1. Run cmquerycl to get a cluster configuration template file that includes
networking information for interfaces that are available to be added to
the cluster configuration:
cmquerycl -c cluster1 -C clconfig.ascii
NOTE As of Serviceguard A.11.18, cmquerycl -c produces output that includes
commented-out entries for interfaces that are not currently part of the
cluster configuration, but are available.
The networking portion of the resulting clconfig.ascii file looks
something like this: