Add SSH certificate with your server - No need to re-type password to access SSH

Best Way to Sign SSH certificate from your PC to your server 

Follow commands below to sign certificate

Notice : Do not sudo to root

mkdir -p ~/.ssh  (Create if you don't have yet)

chmod 700 ~/.ssh  (add permission)

cd ~/.ssh

ssh-keygen -t rsa   (This step please make sure you have enter the specific name of your ssh file)

ll ~/.ssh  (Check the files list you have created )

ssh-copy-id -i ~/.ssh/ur_cert_name.pub USER_NAME@SERVER_IP (Copy certificate pub to server)

Let system to use which SSH key

cd ~/.ssh

touch config (Create config file)

Add this inside the config file

nano ~/.ssh/config

Host SERVER_IP
HostName SERVER_IP
IdentityFile ~/.ssh/ur_cert_name

Note : If you have multi servers you can add config bellow

Host SERVER_IP1
HostName SERVER_IP1
IdentityFile ~/.ssh/ur_cert_name1

Host SERVER_IP2
HostName SERVER_IP2
IdentityFile ~/.ssh/ur_cert_name2

After done you can try to ssh USER_NAME@SERVER_IP