title: Hadoop 3.0.3 -- Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password)
body: <p>Another episode of the dreaded SSH fail...seems awfully common!</p>
  
  <p>I'm installing Hadoop 3.0.3 on a cluster of 3 servers -- A, B, and C.
  A is the Namenode, B and C are workers.
  Each server can contact the other two servers using SSH
  without a password.  Permissions for the .ssh directory are
  at 700 on each machine, and permissions for the authorized_keys
  are at 600 on each machine.  Good for me.</p>
  
  <p>Regardless -- attempting to run start-dfs.sh or start-all.sh
  throws the message:
  A: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).
  (A -- for server A)</p>
  
  <p>Any suggestions?  Thanks!</p>