title: Getting permission denied error while executing ./start-dfs.sh for a single node hadoop cluster, trying on CentOS
body: <pre><code>[dsawale@localhost sbin]$ ./start-dfs.sh 
  Starting namenodes on [localhost]
  localhost: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).
  Starting datanodes
  localhost: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).
  Starting secondary namenodes [localhost.localdomain]
  localhost.localdomain: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).
  2020-03-05 13:17:11,502 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
  </code></pre>