[Unit] Description=Generate sshd host keys ConditionPathExists=|!/etc/ssh/ssh_host_rsa_key ConditionPathExists=|!/etc/ssh/ssh_host_ecdsa_key ConditionPathExists=|!/etc/ssh/ssh_host_ed25519_key Before=sshd.service [Service] Type=oneshot RemainAfterExit=yes ExecStart=/usr/bin/ssh-keygen -A [Install] WantedBy=multi-user.target