Hadoop passwordless SSH authentication

Hadoop.SSH.PublicKey.Authentication

1.      Generate public and private SSH keys on the Primary Server host.

ssh-keygen

2.      Copy the SSH Public Key (id_rsa.pub) to the user account on your target hosts.

.ssh/id_rsa

.ssh/id_rsa.pub

3.      Add the SSH Public Key to the authorized_keys file on your target hosts.

cat id_rsa.pub >> authorized_keys

4.      Depending on your version of SSH, you may need to set permissions on the .ssh directory (to 700) and the authorized_keys file in that directory (to 600) on the target hosts.

chmod 700 ~/.ssh

chmod 600 ~/.ssh/authorized_keys

5.      From the Primary Server, make sure you can connect to each host in the cluster using SSH, without having to enter a password.

ssh root@<remote.target.host>