Checking Port Occupancy

The default port for a FineDataLink project is 8068. The FineDataLink project will fail to start if port 8068 is occupied before project deployment. This document describes how to check whether a port is occupied or not.

Method One: Using the lsof Command

lsof Command Introduction

lsof (List Open Files) is a utility that lists files currently open by the system.

lsof -i is used to display process information matching specified conditions. The command should be run with root privileges, as shown in the following figure.

Step

lsof -i:Port number is used to check the usage of a specific port. For example, to check port 8080, use lsof -i:8080, as shown in the following figure.

According to the output above, the process occupying port 8080 is a Java process with a process ID (PID) of 22936.

Method Two: Using the netstat Command

netstat Command Introduction

The netstat -tunlp command is used to check process information associated with a specific port, as shown in the following figure.

Step

netstat -tunlp|grep Port number is used to check process information associated with a specific port. For example, to check port 8080, execute netstat -tunlp|grep 8080, as shown in the following figure.

According to the output above, the process occupying port 8080 is a Java process with a process ID (PID) of 22936.

netstat -ano lists the status of all ports.

netstat -aon|findstr "Port number" checks the status of a specified port. For example, to check port 8075, run netstat -aon|findstr "8075", as shown in the following figure.

The last column displays corresponding PIDs. You can check applications associated with these PIDs in Task Manager.