Detailed explanation of CentOS firewalld (firewall) instructions

The following column centos system tutorial will introduce CentOS firewalld (firewall) instructions to everyone. I hope it will be helpful to friends in need!

CentOS firewalld (firewall) command

1. View firewalld status

Check the firewalld service status command:

systemctl status firewalld

Check the firewalld status command:

firewall-cmd --state

2. Turn on, Restart and shut down the firewalld service

Open:

service firewalld start

Close:

service firewalld stop

Restart:

service firewalld restart

3. Query, open and close firewalld ports

Query all open ports:

firewall-cmd --list-all

Query whether a certain port is open :

firewall-cmd --query-port=[端口]/tcp

Open port:

firewall-cmd --permanent --add-port=[端口]/tcp

Close port:

firewall-cmd --permanent --remove-port=[端口]/tcp

Refresh service (refresh is required after opening and closing port operations to take effect ):

firewall-cmd --reload

PS: Error ModuleNotFoundError: No module named 'gi'

Execute command: sudo vim /usr/bin/firewall-cmd, open Modify the first line of python in the file to python2

For more centos related technical articles, please visit the centos basic tutorial column!

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