CentOS firewall commonly used commands

1. Check the firewall status:

firewall-cmd --state 

2. Start the firewall

systemctl start firewalld

3. Turn off the firewall

systemctl stop firewalld

4. Check the firewall open ports

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

5. Open a new port

firewall-cmd --zone=public --add-port=8080/tcp --permanent

6. Restart the firewall

firewall-cmd --reload

7. Verify that the new port is in effect increase

firewall-cmd --zone=public --query-port=8080/tcp

8. Firewall boot from the start

systemctl enable firewalld.service

9. cancel a firewall ports open

firewall-cmd --zone=public --remove-port=9200/tcp --permanent