Time for action – setting up SSH

Carry out the following steps to set up SSH:

1. Create a new OpenSSL key pair with the following commands:

   $ ssh-keygen
   Generating public/private rsa key pair.
   Enter file in which to save the key (/home/hadoop/.ssh/id_rsa): 
   Created directory '/home/hadoop/.ssh'.
   Enter passphrase (empty for no passphrase): 
   Enter same passphrase again: 
   Your identification has been saved in /home/hadoop/.ssh/id_rsa.
   Your public key has been saved in /home/hadoop/.ssh/id_rsa.pub.
   …
   

2. Copy the new public key to the list of authorized keys by using the following command:

   $ cp .ssh/id _rsa.pub  .ssh/authorized_keys 
   

3. Connect to the local host.

   $ ssh localhost
   The authenticity of host 'localhost (127.0.0.1)' can't be established.
   RSA key fingerprint is b6:0c:bd:57:32:b6:66:7c:33:7b:62:92:61:fd:ca:2a.
   Are you sure you want to continue connecting (yes/no)? yes
   Warning: Permanently added 'localhost' (RSA) to the list of known hosts.
   

4. Confirm that the password-less SSH is working.

   $ ssh localhost...