Linux-怎样检察Linux体系是否开通sshd服务
方法1、输入setup命令检察体系服务配置输入setup命令，选择体系服务，检察sshd服务前面是否有 *号，有*号表现已开启该服务。
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服务前面有 *号表现已开启该服务。
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参考资料：https://www.bilibili.com/video/BV1dW411M7xL/?p=13
方法2、检察Linux体系是否开通sshd服务：systemctl status sshd.service大概service sshd status
如果该命令返回类似于active (running)的效果，则表现sshd服务已经在运行中。
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# systemctl status sshd.service # 查看Linux系统是否开通sshd服务
● sshd.service - OpenSSH server daemon
Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; vendor preset: enabled)
Active: active (running) since Sat 2021-06-05 09:59:11 CST; 2 years 8 months ago
Docs: man:sshd(8)
man:sshd_config(5)
Main PID: 1138 (sshd)
Tasks: 1
Memory: 7.8M
CGroup: /system.slice/sshd.service
└─1138 /usr/sbin/sshd -D
Mar 01 11:29:45 sr sshd: Did not receive identification string from XXX.XXX.XXX.XXX port 43992
Mar 01 12:01:05 sr sshd: Did not receive identification string from XXX.XXX.XXX.XXX port 59472
Mar 01 12:39:53 sr sshd: Connection closed by XXX.XXX.XXX.XXX port 52504
Mar 01 12:39:55 sr sshd: Connection closed by XXX.XXX.XXX.XXX port 52518
Mar 01 12:39:56 sr sshd: Connection closed by XXX.XXX.XXX.XXX port 52524
Mar 01 13:59:54 sr sshd: Did not receive identification string from XXX.XXX.XXX.XXX port 64001
Mar 01 14:52:51 sr sshd: Did not receive identification string from XXX.XXX.XXX.XXX port 57980
Mar 01 16:01:59 sr sshd: Accepted password for root from XXX.XXX.XXX.XXX port 18389 ssh2
Mar 01 16:42:55 sr sshd: Connection closed by XXX.XXX.XXX.XXX port 36434
Mar 01 16:44:21 sr sshd: Did not receive identification string from XXX.XXX.XXX.XXX port 10000
# service sshd status # 查看Linux系统是否开通sshd服务
● sshd.service - OpenSSH server daemon
Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; vendor preset: enabled)
Active: active (running) since Sat 2021-06-05 09:59:11 CST; 2 years 8 months ago
Docs: man:sshd(8)
man:sshd_config(5)
Main PID: 1138 (sshd)
Tasks: 1
Memory: 7.8M
CGroup: /system.slice/sshd.service
└─1138 /usr/sbin/sshd -D
Mar 01 11:29:45 sr sshd: Did not receive identification string from XXX.XXX.XXX.XXX port 43992
Mar 01 12:01:05 sr sshd: Did not receive identification string from XXX.XXX.XXX.XXX port 59472
Mar 01 12:39:53 sr sshd: Connection closed by XXX.XXX.XXX.XXX port 52504
Mar 01 12:39:55 sr sshd: Connection closed by XXX.XXX.XXX.XXX port 52518
Mar 01 12:39:56 sr sshd: Connection closed by XXX.XXX.XXX.XXX port 52524
Mar 01 13:59:54 sr sshd: Did not receive identification string from XXX.XXX.XXX.XXX port 64001
Mar 01 14:52:51 sr sshd: Did not receive identification string from XXX.XXX.XXX.XXX port 57980
Mar 01 16:01:59 sr sshd: Accepted password for root from XXX.XXX.XXX.XXX port 18389 ssh2
Mar 01 16:42:55 sr sshd: Connection closed by XXX.XXX.XXX.XXX port 36434
Mar 01 16:44:21 sr sshd: Did not receive identification string from XXX.XXX.XXX.XXX port 10000
方法3、查抄服务器的22端口是否处于监听状态（SSH默认使用22端口）：netstat -tuln | grep 22大概netstat -an | grep 22
如果SSH服务已启用，而且服务器正在监听22端口，将显示类似于0.0.0.0:22或:::22的信息。
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# netstat -tuln | grep 22 # 检查服务器的22端口是否处于监听状态
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
# netstat -an | grep 22 # 检查服务器的22端口是否处于监听状态
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:60119 127.0.0.1:35322 TIME_WAIT
tcp 0 52 XXX.XXX.XXX.XXX:22 XXX.XXX.XXX.XXX:18389 ESTABLISHED
tcp 0 0 XXX.XXX.XXX.XXX:39116 XXX.XXX.XXX.XXX:60101 ESTABLISHED
tcp 0 0 XXX.XXX.XXX.XXX:32792 XXX.XXX.XXX.XXX:60101 ESTABLISHED
unix2 [ ACC ] STREAM LISTENING 12258 /run/dbus/system_bus_socket
unix2 [ ] DGRAM 14221
unix3 [ ] STREAM CONNECTED 21885622
方法4、检察是否有sshd进程：ps -ef | grep sshd
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# ps -ef | grep sshd # 查看是否有 sshd 进程
root 1138 102021 ? 00:01:18 /usr/sbin/sshd -D
root 1011311380 16:01 ? 00:00:00 sshd: root@pts/0
root 18104 101150 17:27 pts/0 00:00:00 grep --color=auto sshd
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