Tried the following command:
./couchbase-cli cluster-init -c caper-004.hq.northscale.net --cluster-init-username=Administrator --cluster-init-password=password --cluster-init-port=8080 -cluster-init-ramsize=4096
RESULT = SUCCESS: init caper-004.hq.northscale.net
The node is initialized when checked on UI.
But after refreshing the page once or twice, couchbase server goes down and then doesn't shows up even after restarting couchbase-server through terminal. Tried the same using IP address but result is same.