SSH cheatsheet
Restart the SSH agent (macOS)
$ eval "$(ssh-agent -s)"
Create a new key (macOS)
$ ssh-keygen -t ed25519 -C "ian@iafisher.com"
$ ssh-add --apple-use-keychain path/to/key
$ eval "$(ssh-agent -s)"
Add key to remote server
$ ssh-copy-id -i path/to/key USER@SERVER
Deny password authentication
In /etc/ssh/sshd_config:
PermitRootLogin no # or without-password
PasswordAuthentication no
Read logs
$ less /var/log/auth.log