What is the command to open a port in Linux?

In Linux, the command to open a port is "firewall-cmd --zone=public --add-port=port/communication protocol --permanent"; the "--zone" in this command indicates the role Domain, "--permanent" means that after opening the port, it will take effect permanently. After using this command to open the specified port, you need to restart the firewall to make it effective.

#The operating environment of this tutorial: linux7.3 system, Dell G3 computer.

What is the command to open a port in Linux

The command to open a port in Linux is

firewall-cmd --zone=public --add-port=端口/通讯协议 --permanent

It should be noted that we need to restart the firewall after opening the specified port.

Examples are as follows:

1. Open the firewall

    systemctl start firewalld

2. Open the specified port

      firewall-cmd --zone=public --add-port=1935/tcp --permanent

Command meaning:

• --zone #scope

• --add-port=1935/tcp #Add port, the format is: port/communication protocol

• --permanent #Effective permanently, without this parameter it will be invalid after restarting

3. Restart the firewall

      firewall-cmd --reload

4. Check the port number

netstat -ntlp   //查看当前所有tcp端口·
netstat -ntulp |grep 8888   //查看所有1935端口使用情况·

Recommended learning: Linux video tutorial

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