Nodes not joining cluster after upgrade to elasticsearch 2.0

I have upgraded elasticsearch logstash and kibana and after the upgrade my nodes wont join the cluster. I have two nodes. I want one to be a master and data node the other to just be a data node. When I check the state of the cluster it only shows there to be one node. Any help is appreciated.


Out of the box Elasticsearch 2.0 binds to localhost only. See