How to check port occupancy in centos system

Requirements:

Sometimes when you start an application, you will find that the port is already occupied, or you may feel that some ports are not used but find that they are open. At this time we want to know which application/process is using the port.

(Recommended tutorial:centos usage tutorial)

The method is as follows:

You can use netstat or lsof to view it under CentOS.

1,

netstat -nap #会列出所有正在使用的端口及关联的进程/应用

2,

lsof -i :portnumber #portnumber要用具体的端口号代替，可以直接列出该端口听使用进程/应用

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