kazulog@sv1:~$ sudo systemctl daemon-reload
kazulog@sv1:~$ sudo systemctl restart ssh.socket
kazulog@sv1:~$ ss -tlnp | grep -E ':22 |:2222'
LISTEN 0      4096         0.0.0.0:2222      0.0.0.0:*
LISTEN 0      4096            [::]:2222         [::]:*          
kazulog@sv1:~$ cat /run/systemd/generator/ssh.socket.d/addresses.conf
# Automatically generated by sshd-socket-generator

[Socket]
ListenStream=
ListenStream=0.0.0.0:2222
ListenStream=[::]:2222
kazulog@sv1:~$ ssh -p 2222 taro@localhost whoami
taro