6.5. Starting instances in a cluster

The JBoss Enterprise Application Platform AMIs provided by Red Hat feature two additional server profiles called cluster_ec2 and mod_cluster-ec2.

They both feature the ability to form a cluster inside the EC2 environment where multicast is not available. This is done by configuring JGroups to use only TCP unicast for cluster communication and S3_PING as the discovery protocol.

Additionally mod_cluster-ec2 is pre-configured to easily register with mod_cluster proxies.

The following sections describe the additional setup required for S3_PING, clustering and mod_cluster.