linux open port command

The Linux command to open a port is [firewall-cmd --zone=public --add-port=1935/tcp --permanent]. It should be noted that we need to restart the firewall after opening the specified port.

#The operating environment of this article: centos 7 system, thinkpad t480 computer.

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 #Permanently effective, it will be invalid after restarting without this parameter

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 1935   //查看所有1935端口使用情况

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