Automatic login with ssh without a password - Linux

Install a ssh client

sudo apt-get install ssh

1. Login to the ssh server with your client.

2. Generate your key pair using the following command: (Don't use any passphrase)

   sahab@xxxx:~$ ssh-keygen -t rsa
   Generating public/private rsa key pair.
   Enter file in which to save the key (/home/sahab/.ssh/id_rsa):
   Created directory '/home/sahab/.ssh'.
   Enter passphrase (empty for no passphrase):
   Enter same passphrase again:
   Your identification has been saved in /home/sahab/.ssh/id_rsa.
   Your public key has been saved in /home/sahab/.ssh/id_rsa.pub.
   The key fingerprint is:
   2a:23:a3:f8:6c:af:3f:7e:12:b4:6a:80:98:c0:f3:ea sahab@gis
   The key's randomart image is:
   +--[ RSA 2048]----+
   |                 |
   |                 |
   |.                |
   |.o  .            |
   |+.o. .  S        |
   |=  .o  .         |
   | .+.o..          |
   |.++ooo.          |
   |+E+=++           |
   +-----------------+
   sahab@xxx:~$ cd ~/.ssh
   sahab@xxx:~/.ssh$ cat id_rsa.pub >> authorized_keys
   sahab@xxx~/.ssh$ chmod 600 authorized_keys
   

3. Log out of the server and go back to your local shell

   $ cd
   $ cd .ssh

4. Copy the file id_rsa that was generated on the server into this directory. You can use sftp or scp for this.
   

sahab@sahab-desktop:~/.ssh$ sudo scp -r sahab@xxx:/home/sahab/.ssh/id_rsa
/home/sahab/.ssh/

     $ cd .ssh
    $ chmod 600 id_rsa

    You should now be able to login via ssh without having to prompt for a password.