turrn on ssh, ssh-keygen

turrn on ssh

sudo vi /etc/ssh/sshd_config
sudo systemctl restart sshd


laptop1:~ yourname$ ssh-keygen
Generating public/private rsa key pair. 
1. enter file name
2. enter pass for key or not. If not when ssh don't need pass to ssh with key


ssh-copy-id -i ~/.ssh/id_rsa.pub user@server
(using with public key. NOT private key)


ssh -i ~/.ssh/custom_key_name SYSUSER@x.x.x.x