Amazon EC2 hostnames

Posted by Firefly on Server Fault See other posts from Server Fault or by Firefly
Published on 2012-12-09T08:10:40Z Indexed on 2012/12/09 17:06 UTC
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amazon-ec2

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xmpp

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".

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