Config login ssh key

** Client Machine **

- Create ssh key
> ssh-keygen -t rsa
- Key is saved default at ~/.ssh/id_rsa
- Enter passphrase
- Copy public key ~/.ssh/id_rsa.pub
> pbcopy < ~/.ssh/id_rsa.pub OR cat ~/.ssh/id_rsa.pub

** Server **

- Create directory .ssh
> mkdir -p ~/.ssh
- Paste public key to file  ~/.ssh/authorized_keys
> chmod 700 -R ~/.ssh
> chmod 600 ~/.ssh/authorized_keys

- Turn off password
> nano /etc/ssh/sshd_config
- Find and setting 
PasswordAuthentication no
UsePAM no
> systemctl reload ssh

NOTE: SSH Key doesn't working if SELinux ON. To disable SELinux:
> nano /etc/selinux/config
- Find and Replace SELINUX=enforcing to SELINUX=disabled
- Reboot server