How to open ports with firewall-cmd command

How to open the port with firewall-cmd command: 1. Open the terminal command window; 2. Open it by executing the "firewall-cmd --zone=public --add-port=8888/tcp --permanent" command Just specify the port.

The operating environment of this tutorial: Centos7 system, Dell G3 computer.

How to open the port with the firewall-cmd command?

Centos7 Use the firewall-cmd command to open and view port openings

1. Open ports

firewall-cmd --zone=public --add-port=8888/tcp --permanent   # 开放5672端口
firewall-cmd --zone=public --remove-port=8888/tcp --permanent  #关闭5672端口
firewall-cmd --reload   # 配置立即生效

2. View all open ports on the firewall

firewall-cmd --zone=public --list-ports

3. Turn off the firewall

If you don’t want to control the port, just turn off the system firewall. Everything will work, but the security is not strong, so it is not recommended.

systemctl stop firewalld.service

4. Check the firewall status

 firewall-cmd --state

5. Check the listening port

netstat -lnpt

PS: centos7 does not have the netstat command by default. You need to install the net-tools tool, yum install - y net-tools

6. Check which process the port is occupied

netstat -lnpt |grep 8888

7. View the detailed information of the process

ps 8888

8. Terminate the process

kill -9 6832

Recommended study: "Linux Video Tutorial"

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