Bastion Host 프로필을 별도로 작성하고 간단히 접근

Host Bastion
    HostName 77.77.777.777
    User ec2-user
    Port 22
    IdentityFile C:\\Users\\USERNAME\\.ssh\\bastion-key.pem

Host Target
    HostName 33.33.333.333
    User ubuntu
    Port 22
    IdentityFile C:\\Users\\USERNAME\\.ssh\\ssh-key.pem
    ProxyCommand ssh -q -W %h:%p Bastion
    # LocalForward 13306 localhost:3306 # 13306 -> 3306