I'm currently trying to setup a Tigase cluster on Amazon EC2 instances in a VPC and I'm having troubles getting it to work due to the hostnames of the instances not being "full DNS names". According to the Tigase documentation:
Please note the proper DNS configuration is critical for the cluster to work correctly. Make sure the 'hostname' command returns a full DNS name on each cluster node.
Can anyone explain what a full DNS name is and how I can set my instances to use one? Currently my instances get a default hostname of the form "ip-10-0-0-20".