Host MasterServer Hostname x User y IdentityFile ~/.ssh/id_ed25519 ControlPath ~/.ssh/control-%h-%p-%r # as recommended by the man page Host MasterServerSQL Hostname x User y IdentityFile ~/.ssh/id_ed25519 LocalForward 3306 localhost:3306 ControlPath ~/.ssh/control-%h-%p-%r
ssh -M MasterServer
ssh -MNf MasterServerSQL
ssh -O exit MasterServer