方式一：systemctl查看服务状态
[xy@xunye ~]$ systemctl status sshd
● sshd.service - OpenSSH server daemon
Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; vendor preset: enabled)
Active: active (running) since 日 2020-11-29 14:51:51 CST; 3 weeks 6 days ago
Docs: man:sshd(8)
man:sshd_config(5)
Main PID: 1248 (sshd)
Tasks: 1
CGroup: /system.slice/sshd.service
└─1248 /usr/sbin/sshd -D
11月 29 14:51:51 xunye systemd[1]: Starting OpenSSH server daemon...
11月 29 14:51:51 xunye sshd[1248]: Server listening on 0.0.0.0 port 22.
11月 29 14:51:51 xunye sshd[1248]: Server listening on :: port 22.
11月 29 14:51:51 xunye systemd[1]: Started OpenSSH server daemon.
12月 27 09:47:44 xunye sshd[13017]: Accepted password for xy from 192.168.0.103 port 5041 ssh2
12月 27 11:06:13 xunye sshd[14432]: Accepted password for xy from 192.168.0.103 port 4236 ssh2
方式二：查看socket 22号端口监听情况
[xy@xunye ~]$ netstat -anp | grep 22
(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)
tcp 0 0 192.168.122.1:53 0.0.0.0:* LISTEN -
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN -
tcp 0 0 192.168.0.104:22 192.168.0.103:4236 ESTABLISHED -
tcp6 0 0 :::22 :::* LISTEN
[xy@xunye ~]$ netstat -anp | grep ssh
(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)
unix 2 [ ACC ] STREAM LISTENING 44486 - /tmp/ssh-gDvgZ4vVQfUO/agent.3110
unix 2 [ ACC ] STREAM LISTENING 41423 - /run/user/1000/keyring/ssh
方式三：查看进程
[xy@xunye ~]$ ps -aux | grep sshd
root 1248 0.0 0.1 112924 4312 ? Ss 11月29 0:00 /usr/sbin/sshd -D
root 14432 0.1 0.1 161012 5680 ? Ss 11:06 0:00 sshd: xy [priv]
xy 14436 0.1 0.0 161164 2516 ? S 11:06 0:00 sshd: xy@notty
xy 15035 0.0 0.0 112828 980 pts/3 S+ 11:09 0:00 grep --color=auto sshd