Linux firewalld to open the firewall and port step tutorial, linuxfirewalld

Linux firewalld to open the firewall and port step tutorial, linuxfirewalld

1. Basic use of firewalld

Start: systemctl start firewalld

View status: systemctl status firewalld

Stop: systemctl disable firewalld

Disable: systemctl stop firewalld

2. systemctl is the main tool in CentOS7 service management tools. It integrates the functions of previous services and chkconfig.

Start a service: systemctl start firewalld. service

Disable 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 startup: systemctl enable firewalld. service

Disable a service at startup: systemctl disable firewalld. service

Check whether the service is started: systemctl is-enabled firewalld. service

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

View the list of failed services: systemctl -- failed

3. Configure firewalld-cmd

View the version: firewall-cmd -- version

View help: firewall-cmd -- help

Display status: firewall-cmd -- state

View All opened ports: firewall-cmd -- zone = public -- list-ports

Update firewall rules: firewall-cmd -- reload

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

View the region of the specified interface: firewall-cmd -- get-zone-of-interface = eth0

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

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

Check whether the request is rejected: firewall-cmd -- query-panic

How can I enable a port?

Add

Firewall-cmd -- zone = public -- add-port = 80/tcp -- permanent (-- permanent takes effect permanently. If this parameter is not set, it becomes invalid after restart)

Reload

Firewall-cmd -- reload

View

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

Delete

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