Managing HP Serviceguard A.11.20.20 for Linux, May 2013

• 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.
Information about these parameters begins at monitored_subnet (page 181).
• You cannot change the IP configuration of an interface (NIC) 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
CAUTION: Do not add IP addresses to network interfaces that are configured into the Serviceguard
cluster, unless those IP addresses themselves will be immediately configured into the cluster as
stationary IP addresses. If you configure any address other than a stationary IP address on a
Serviceguard network interface, it could collide with a relocatable package address assigned by
Serviceguard.
Some sample procedures follow.
7.6.4.3 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.
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.conf
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.conf file looks something like this:
NODE_NAME ftsys9
NETWORK_INTERFACE lan1
HEARTBEAT_IP 192.3.17.18
#NETWORK_INTERFACE lan0
#STATIONARY_IP 15.13.170.18
NETWORK_INTERFACE lan3
NODE_NAME ftsys10
NETWORK_INTERFACE lan1
HEARTBEAT_IP 192.3.17.19
#NETWORK_INTERFACE lan0
#STATIONARY_IP 15.13.170.19
NETWORK_INTERFACE lan3
2. Edit the file to uncomment the entries for the subnet that is being added (lan0 in this example),
and change STATIONARY_IP to HEARTBEAT_IP:
NODE_NAME ftsys9
NETWORK_INTERFACE lan1
HEARTBEAT_IP 192.3.17.18
NETWORK_INTERFACE lan0
HEARTBEAT_IP 15.13.170.18
7.6 Reconfiguring a Cluster 231