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This article introduces the knowledge of "how CentOS7 uses firewalld to open and close firewalls and ports". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

1. Basic use 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

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

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

3. 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

So how do you open a port?

Add

Firewall-cmd-- zone=public-- add-port=80/tcp-- permanent (--permanent takes effect permanently, and becomes invalid 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

Tag: linux

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