the contents of your /etc/hosts file may be the root of your problems in your other post. int /etc/hosts there should be only one ip for each hostname. If there are more than one ip for a host name the system will get confused as to which ip to use. a computer can have two ips, but it should have a different hostname for each ip. Also the hostname used by hadoop/Ambari needs to be the hostname returned by the 'hostname -f' command.