Managing Serviceguard 13th Edition, February 2007

Building an HA Cluster Configuration
Preparing Your Systems
Chapter 5198
NOTE If a NIC fails, the affected node will be able to fail over to a standby LAN
so long as the node is running in the cluster. But if a NIC that is used by
Serviceguard fails when the affected node is not running in the cluster,
Serviceguard will not be able to restart the node. (For instructions on
replacing a failed NIC, see “Replacing LAN or Fibre Channel Cards” on
page 354.)
1. Edit the /etc/hosts file on all nodes in the cluster. Add name
resolution for all heartbeat IP addresses, and other IP addresses
from all the cluster nodes; see “Configuring IP Address Resolution”
on page 189 for discussion and examples.
NOTE For each cluster node, the public-network IP address must be the
first address listed. This enables other applications to talk to other
nodes on public networks.
2. If you are using DNS, make sure your nameservers are configured in
/etc/resolv.conf, for example:
domain cup.hp.com
search cup.hp.com hp.com
nameserver 15.243.128.51
nameserver 15.243.160.51
3. Edit or create the /etc/nsswitch.conf file on all nodes and add the
following text (on one line), if it does not already exist:
for DNS, enter (one line):
hosts: files [NOTFOUND=continue UNAVAIL=continue] dns
[NOTFOUND=return UNAVAIL=return]
for NIS, enter (one line):
hosts: files [NOTFOUND=continue UNAVAIL=continue] nis
{NOTFOUND=return UNAVAIL=return]
If a line beginning with the string “hosts:” already exists, then
make sure that the text immediately to the right of this string is (on
one line):