systemctl status sshd

systemctl status ssh
● ssh.service - OpenBSD Secure Shell server
    Loaded: loaded (/lib/systemd/system/ssh.service; enabled; vendor preset: enabled)
    Active: active (running) since Thu 2021-04-15 13:12:02 UTC; 5 days ago
      Docs: man:sshd(8)
            man:sshd_config(5)
   Process: 812 ExecStartPre=/usr/sbin/sshd -t (code=exited, status=0/SUCCESS)
   Process: 451365 ExecReload=/usr/sbin/sshd -t (code=exited, status=0/SUCCESS)
   Process: 451366 ExecReload=/bin/kill -HUP $MAINPID (code=exited, status=0/SUCCESS)
  Main PID: 848 (sshd)
     Tasks: 1 (limit: 1073)
    Memory: 14.4M
    CGroup: /system.slice/ssh.service
            └─848 sshd: /usr/sbin/sshd -D [listener] 0 of 10-100 startups

● ssh.service - OpenBSD Secure Shell server
     Loaded: loaded (/lib/systemd/system/ssh.service; enabled; vendor preset: enabled)
     Active: active (running) since Thu 2020-11-26 14:09:03 UTC; 3 days ago
       Docs: man:sshd(8)
             man:sshd_config(5)
    Process: 556 ExecStartPre=/usr/sbin/sshd -t (code=exited, status=0/SUCCESS)
   Main PID: 570 (sshd)
      Tasks: 1 (limit: 38089)
     Memory: 10.5M
     CGroup: /system.slice/ssh.service
             └─570 sshd: /usr/sbin/sshd -D [listener] 0 of 10-100 startups

Nov 30 07:22:50 HOSTNAME sshd[1052334]: Accepted password for USERNAME from 10.10.10.10 port 54040 ssh2
Nov 30 07:22:50 HOSTNAME sshd[1052334]: pam_unix(sshd:session): session opened for user USERNAME by (uid=0)
Nov 30 07:23:00 HOSTNAME sshd[1052382]: Accepted password for USERNAME from 10.10.10.10 port 54082 ssh2
Nov 30 07:23:00 HOSTNAME sshd[1052382]: pam_unix(sshd:session): session opened for user USERNAME by (uid=0)
Nov 30 07:23:45 HOSTNAME sshd[1052464]: Accepted password for USERNAME from 10.10.10.10 port 54247 ssh2
Nov 30 07:23:45 HOSTNAME sshd[1052464]: pam_unix(sshd:session): session opened for user USERNAME by (uid=0)
Nov 30 07:23:50 HOSTNAME sshd[1052507]: Accepted password for USERNAME from 10.10.10.10 port 54262 ssh2
Nov 30 07:23:50 HOSTNAME sshd[1052507]: pam_unix(sshd:session): session opened for user USERNAME by (uid=0)
Nov 30 07:24:00 HOSTNAME sshd[1052557]: Accepted password for USERNAME from 10.10.10.10 port 54302 ssh2
Nov 30 07:24:00 HOSTNAME sshd[1052557]: pam_unix(sshd:session): session opened for user USERNAME by (uid=0)

Unit sshd.service could not be found.
apt install openssh-server

See also

• Systemd services: systemctl [status | is-active | start | daemon-reload | stop | mask | reload | restart | reboot | enable | disable | cat], systemctl list-units, systemctl list-timers, systemctl --failed, systemctl get-default, systemctl --help, .service, .timer, .socket, systemctl restart elasticsearch.service, systemctl status apt-daily, systemctl status oscapd, set-property
• sshd, sshd logs, sshd -t, sshd -T, sshd_config, sftp, SSH_CLIENT, sshd changelog