When you install hadoop, you will required to create one user hadoop with group hadoop. and setup the SSH keys that it can login to the server without enter a password.
| #Create one group hadoop groupadd hadoop #create one user hadoop, create home directory useradd –g hadoop –-create-home hadoop #login as hadoop su – hadoop #generate ssh public/private keys ssh-keygen –t rsa –P ‘’ # cp the public key to authorized_keys cat .ssh/id_rsa.pub >> .ssh/authorized_keys if you want to enable hadopp to access another server without login using ssh, cat the .put key to the server authorized_keys files #remember to setup the permission on the authorized_keys , that only owner can read/write, 600 permission, if you missed this step, you will be asked for password, even you setup the pub key to be trusted. chmod 600 .ssh/authorized_keys Now, you can login to localhost without password |
whole steps as captured. 
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