Installation guide

As of Red Hat Enterprise Linux 6.4, the Red Hat High Availability Add-On supports the configuration
of redundant ring protocol. When using redundant ring protocol, there are a variety of
considerations you must take into account, as described in Section 7.6, “ Configuring Redundant
Ring Protocol” .
To specify a second network interface to use for redundant ring protocol, you add an alternate name
for the node using the --add al t option of the ccs command:
ccs -h host --addalt node_name alt_name
For example, the following command configures the alternate name clusternet-no d e1-eth2 for
the cluster node clusternet-nod e1-eth1:
# ccs -h cl usternet-nod e1-eth1 --add al t cl usternet-no d e1-eth1
cl usternet-no d e1-eth2
Optionally, you can manually specify a multicast address, a port, and a TTL for the second ring. If
you specify a multicast for the second ring, either the alternate multicast address or the alternate port
must be different from the multicast address for the first ring. If you specify an alternate port, the port
numbers of the first ring and the second ring must differ by at least two, since the system itself uses
port and port-1 to perform operations. If you do not specify an alternate multicast address, the system
will automatically use a different multicast address for the second ring.
To specify an alternate multicast address, port, or TTL for the second ring, you use the --
setaltmul ti cast option of the ccs command:
ccs -h host --setaltmulticast [alt_multicast_address]
[alt_multicast_options].
For example, the following command sets an alternate multicast address of 239.192.99.88, a port of
888, and a TTL of 3 for the cluster defined in the cl uster. co nf file on node cl usternet-no d e1-
eth1:
ccs -h clusternet-node1-eth1 --setaltmulticast 239.192.99.88 port=888
ttl=3
To remove an alternate multicast address, specify the --setaltmul ti cast option of the ccs
command but do not specify a multicast address. Note that executing this command resets all other
properties that you can set with the --setaltmul ti cast option to their default values, as described
in Section 5.1.5, “ Commands that Overwrite Previous Settings” .
When you have finished configuring all of the components of your cluster, you will need to sync the
cluster configuration file to all of the nodes, as described in Section 5.15, “Propagating the
Configuration File to the Cluster Nodes” .
5.15. Propagat ing t he Configurat ion File t o t he Clust er Nodes
After you have created or edited a cluster configuration file on one of the nodes in the cluster, you
need to propagate that same file to all of the cluster nodes and activate the configuration.
Use the following command to propagate and activate a cluster configuration file. When you use the
--acti vate option, you must also specify the --sync option for the activation to take affect.
ccs -h host --sync --activate
Red Hat Ent erprise Linux 6 Clust er Administ rat ion
100