Port occupancy view

If multiple projects are deployed in the system, it is likely that the ports are occupied. This article describes how to check whether the ports are occupied.

1. method 1: use lsof statement to view

1) introduction to lsof statement

lsof (list open files) is a tool that lists the open files of the current system.

lsof -iis used to display qualified processes. Execute lsof -i as root, as shown in the following figure:

2) steps

lsof -i:port number, used to view the occupancy of a port. For example, check the use of port 8080, lsof -i:8080, as shown in the following figure:

According to the above figure, it can be concluded that the java process with process number (PID) of 22936 occupies port 8080.

2. method 2: use netstat statement to view

1) introduction to netstat statement

netstat -tunlpis used to display the ports and processes of TCP and UDP, as shown in the following figure:

2) steps

netstat -tunlp|grep port number, used to view the process of the specified port number. For example, check the 8080 port，netstat -tunlp|grep 8080, as shown in the following figure:

According to the above figure, it can be concluded that the java process with process number (PID) of 22936 occupies port 8080.

netstat -ano: List all ports

netstat -aon|findstr "port number": view the specified port, such as the 8075 port:netstat -aon|findstr "8075", as shown in the following figure:

The last column is the corresponding PID. You can view the application corresponding to the corresponding process number in the 「task manager」.