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This article will explain in detail how to use firewalld to set up firewall ports in CentOS 7. The content of the article is of high quality, so the editor will share it with you for reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.

Basic usage of firewalld

Launch: systemctl start firewalld

Turn off: systemctl stop firewalld

View status: systemctl status firewalld

Power on disabled: systemctl disable firewalld

Power on: systemctl enable firewalld

Systemctl is the main tool in CentOS7's service management tools, which combines the functions of service and chkconfig.

Main functions of systemctl:

Start a service: systemctl start firewalld.service

Shut down a service: systemctl stop firewalld.service

Restart a service: systemctl restart firewalld.service

Displays the status of a service: systemctl status firewalld.service

Enable a service at boot time: systemctl enable firewalld.service

Disable one service at boot time: systemctl disable firewalld.service

Check to see if the service is powered on: systemctl is-enabled firewalld.service

View the list of started services: systemctl list-unit-files | grep enabled

View the list of services that failed to start: systemctl-- failed

Configure firewalld-cmd

View version: firewall-cmd-- version

Check out help: firewall-cmd-help

Display status: firewall-cmd-- state

View all open ports: firewall-cmd-- zone=public-- list-ports

Update firewall rules: firewall-cmd-- reload

View area information: firewall-cmd-- get-active-zones

View the area to which the specified API belongs: firewall-cmd-- get-zone-of-interface=eth0

Reject all packages: firewall-cmd-- panic-on

Cancel rejection status: firewall-cmd-- panic-off

Check whether to reject: firewall-cmd-- query-panic

For example: open a port in the firewall

Add

Firewall-cmd-- zone=public-- add-port=80/tcp-- permanent (--permanent takes effect permanently. It will expire after restart without this parameter.

Reload

Firewall-cmd-reload

View

Firewall-cmd-zone= public-query-port=80/tcp

Delete

Firewall-cmd-zone= public-remove-port=80/tcp-permanent

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