vim /etc/ssh/sshd_config
### vim ###
PubkeyAuthentication yes
### vim ###
systemctl restart sshd
ssh-keygen
ssh-keygen
linux : ssh-copy-id [host]@[Server IP]
Windows : PowerShell -Command type $env:USERPROFILE\\.ssh\\id_rsa.pub | ssh [host]@[Server IP] "cat >> .ssh/authorized_keys"
# id_rsa.pub 이름이 다를 수 있음
ssh [host]@[Server IP]