I dont think we can get this from Ambari as this is a Linux file, and Ambari is not involved in maintaining that. As far as logging on to the Namenode, it should be the similar as how you logged on to any other host on the cluster. We use ssh with a keypair to logon, but thats your environment specific. So, if you have the IP, you should be able to logon to the Namenode host.
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