Linux查看端口占用情况

排查问题的时候，可能需要知道这个端口目前被哪个服务占用着，在linux中，一般会用到lsof和netstat这2个命令。比如检查80端口的占用情况

lsof

[root@VM_43_49_centos ~]# sudo lsof -i:80
COMMAND   PID  USER   FD   TYPE    DEVICE SIZE/OFF NODE NAME
nginx    5358  root    6u  IPv4 236554022      0t0  TCP *:http (LISTEN)
nginx    5358  root    7u  IPv6 236554023      0t0  TCP *:http (LISTEN)
nginx   28325 nginx    6u  IPv4 236554022      0t0  TCP *:http (LISTEN)
nginx   28325 nginx    7u  IPv6 236554023      0t0  TCP *:http (LISTEN)

netstat

[root@VM_43_49_centos ~]# sudo netstat -tunlp | grep 80
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      5358/nginx: master
tcp6       0      0 :::80                   :::*                    LISTEN      5358/nginx: master

注意在Mac上面，netstat的命令可能会出现下面的异常：

~ » netstat -tunlp | grep 80
netstat: option requires an argument -- p
Usage:	netstat [-AaLlnW] [-f address_family | -p protocol]
	netstat [-gilns] [-f address_family]
	netstat -i | -I interface [-w wait] [-abdgRtS]
	netstat -s [-s] [-f address_family | -p protocol] [-w wait]
	netstat -i | -I interface -s [-f address_family | -p protocol]
	netstat -m [-m]
	netstat -r [-Aaln] [-f address_family]
	netstat -rs [-s]

查询了一下stackoverflow，发现How to query ports are using by one process with knowing its name or pid on mac?：

If you are only interested in inet ports then you can use:

netstat -anvf inet

Or TCP sockets:

netstat -anvp tcp

Or UDP sockets:

netstat -anvp udp

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