Setup SSH with RSA keypairs

Firstly, you can easily remote to server with 

ssh your_username@server_address

But you can remove the annoying by being asked typing password many times, using RSA keypairs, it is also more secured than using password.

1. Creating a key pairs on Workstation

ssh-keygen -t rsa - b 4096

Add passphrase is recommended

To read your public key

cat ~/.ssh/id_rsa.pub

2. Uploading public keys to the Server

SSH to the Server

ssh your_username@server_address 

Create a file in .ssh/authorized_keys  and paste the public key into

you can do it from Workstation with one command using 

cat ~/.ssh/id_rsa.pub | ssh your_username@server_address 'cat >> .ssh/authorized_keys'

And change the permission

ssh your_username@server_address ‘chmod 700 .ssh; chmod 640 .ssh/authorized_keys’

From now we can ssh with being asked for password

ssh your_username@server_address

3. Turn off password authentication

On Server Machine

sudo vim /etc/ssh/sshd_config

Uncomment Passwordauthentication , change the value to No

And  restart ssh 

sudo systemctl restart ssh