Med Java

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====== Public key authentication to remote ssh server ======

Create a SSH key-pair and set a custom name for it to not override the existing one. \\ 
Change id_rsa with a custom name (for example id_rsa_odcent8)

<code bash>
cd ~/.ssh/
</code>

<code>
ssh-keygen -t rsa -b 4096
</code>

Output:

  Generating public/private rsa key pair.
  Enter file in which to save the key (/c/Users/odefta/.ssh/id_rsa): id_rsa_odcent8
  Enter passphrase (empty for no passphrase):
  Enter same passphrase again:
  Your identification has been saved in id_rsa_odcent8
  Your public key has been saved in id_rsa_odcent8.pub

Copy the public key to the remote machine.
<code>
ssh-copy-id -i ~/.ssh/id_rsa_odcent8.pub root@remote_ssh_server
</code>

Connect to remote_ssh_server and edit /etc/ssh/sshd_config:
<code>
vi /etc/ssh/sshd_config
PubkeyAuthentication yes

systemctl restart sshd
</code>

On the host machine (exit from the remote one):

Edit ~/.ssh/config file and add:

<code>
vi ~/.ssh/config

Host remote_ssh_server
    User root
    IdentityFile ~/.ssh/id_rsa_odcent8
</code>

Now you can connect without password:
<code>
ssh root@remote_ssh_server
</code>