The following column centos tutorial will introduce to you how to check whether the port is occupied in CentOS. I hope it will be helpful to friends in need!
CentOSCheck whether a port is occupied
This article introduces the method of checking whether a port is occupied in Linux, and the use of netstat command Tips, interested friends can refer to it.
Use the command:
netstat -tunlp
will display all ports and all corresponding programs. Use the grep pipe to filter out the desired key fields.
Programs related to port 22 occupancy:
Code example:
[root@leiwan tmp]# netstat -tunlp |grep 22 tcp 0 0 0.0.0.0:42957 0.0.0.0:* LISTEN 2230/rpc.statd tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 2443/sshd tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 2292/cupsd tcp 0 0 :::22 :::* LISTEN 2443/sshd tcp 0 0 ::1:631 :::* LISTEN 2292/cupsd tcp 0 0 :::57609 :::* LISTEN 2230/rpc.statd udp 0 0 0.0.0.0:5353 0.0.0.0:* 2211/avahi-daemon udp 0 0 0.0.0.0:631 0.0.0.0:* 2292/cupsd udp 0 0 0.0.0.0:37167 0.0.0.0:* 2230/rpc.statd udp 0 0 0.0.0.0:52291 0.0.0.0:* 2211/avahi-daemon udp 0 0 0.0.0.0:68 0.0.0.0:* 2207/dhclient udp 0 0 0.0.0.0:710 0.0.0.0:* 2230/rpc.statd udp 0 0 :::39834 :::* 2230/rpc.statd
Check the occupancy of a certain port: lsof -i:port number
Code example:
1 [root@www ~]# lsof -i:21 3 COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME 4 pure-ftpd 2651 root 4u IPv4 7047 TCP *:ftp (LISTEN) 5 pure-ftpd 2651 root 5u IPv6 7048 TCP *:ftp (LISTEN)
This shows that port 21 is being used by pure-ftpd and the status is listen.
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