I configured two JBoss clusters in the same LAN: a production and a test environment.
I decided to configure every single cluster with a dedicate private LANs using a restricted netmask to isolate production and test connectivity, so I assigned
192.168.100.0/255.255.255.0 to test and
192.168.200.0/255.255.255.0 to production.
I configured Apache and mod_jk to loadbalance activities between cluster instances.
The page UsingMod_jk1.2WithJBoss (http://www.jboss.org/community/docs/DOC-12525) is a good tutorial to achieve this.
What problems should I expect?
JBoss uses UDP multicasting to replicate informations across cluster nodes: even if I isolate TCP traffic, JBoss will “ear” messages sent from other clusters and will log a lot of warnings like the following:
… WARN [NAKACK] […] discarded message from non-member ….
I had to change BOTH multicast ip address and port (attributes mcast_addr and mcast_port) in the following configuration files: