如何检查Linux中的开放端口列表？

你也可以使用下面的命令检查特定的端口。

# nmap -sTU -O localhost | grep 123
 
123/udp open  ntp

如何使用 Linux 命令 lsof 检查系统中的开放端口列表？

它向你显示系统上打开的文件列表以及打开它们的进程。还会向你显示与文件相关的其他信息。

# lsof -i
 
COMMAND   PID   USER   FD   TYPE  DEVICE SIZE/OFF NODE NAME
ntpd      895    ntp   16u  IPv4   18481      0t0  UDP *:ntp
ntpd      895    ntp   17u  IPv6   18482      0t0  UDP *:ntp
ntpd      895    ntp   18u  IPv4   18487      0t0  UDP localhost:ntp
ntpd      895    ntp   20u  IPv4   23020      0t0  UDP CentOS7.2daygeek.com:ntp
sshd     1388   root    3u  IPv4   20065      0t0  TCP *:ssh (LISTEN)
sshd     1388   root    4u  IPv6   20067      0t0  TCP *:ssh (LISTEN)
snmpd    1396   root    6u  IPv4   22739      0t0  UDP *:snmp
snmpd    1396   root    7u  IPv4   22729      0t0  UDP *:40105
snmpd    1396   root    8u  IPv4   22730      0t0  UDP *:50656
snmpd    1396   root    9u  IPv4   22731      0t0  UDP *:pammratc
snmpd    1396   root   10u  IPv4   22732      0t0  UDP *:30105
snmpd    1396   root   11u  IPv4   22733      0t0  UDP *:40764
snmpd    1396   root   12u  IPv4   22734      0t0  UDP *:53390
snmpd    1396   root   13u  IPv4   22735      0t0  UDP *:28265
snmpd    1396   root   14u  IPv4   22736      0t0  UDP *:11584
snmpd    1396   root   15u  IPv4   22737      0t0  UDP *:39136
snmpd    1396   root   16u  IPv4   22738      0t0  UDP *:56130
snmpd    1396   root   17u  IPv4   22740      0t0  TCP localhost:smux (LISTEN)
httpd    1398   root    3u  IPv4   20337      0t0  TCP *:http (LISTEN)
master   2038   root   13u  IPv4   21638      0t0  TCP *:smtp (LISTEN)
master   2038   root   14u  IPv6   21639      0t0  TCP *:smtp (LISTEN)
sshd     9052   root    3u  IPv4 1419955      0t0  TCP CentOS7.2daygeek.com:ssh->Ubuntu18-04.2daygeek.com:11408 (ESTABLISHED)
httpd   13371 apache    3u  IPv4   20337      0t0  TCP *:http (LISTEN)
httpd   13372 apache    3u  IPv4   20337      0t0  TCP *:http (LISTEN)
httpd   13373 apache    3u  IPv4   20337      0t0  TCP *:http (LISTEN)
httpd   13374 apache    3u  IPv4   20337      0t0  TCP *:http (LISTEN)
httpd   13375 apache    3u  IPv4   20337      0t0  TCP *:http (LISTEN)

你也可以使用下面的命令检查特定的端口。

# lsof -i:80
 
COMMAND   PID   USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
httpd    1398   root    3u  IPv4  20337      0t0  TCP *:http (LISTEN)
httpd   13371 apache    3u  IPv4  20337      0t0  TCP *:http (LISTEN)
httpd   13372 apache    3u  IPv4  20337      0t0  TCP *:http (LISTEN)
httpd   13373 apache    3u  IPv4  20337      0t0  TCP *:http (LISTEN)
httpd   13374 apache    3u  IPv4  20337      0t0  TCP *:http (LISTEN)
httpd   13375 apache    3u  IPv4  20337      0t0  TCP *:http (LISTEN)

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