tldr/pages/linux/firewall-cmd.md

firewall-cmd

The firewalld command line client

• View the available firewall zones

firewall-cmd --get-active-zones

• View the rules which are currently applied

firewall-cmd --list-all

• Permanently open the port for a service in the specified zone (like port 443 when in the public zone)

firewall-cmd --permanent --zone={{public}} --add-service={{https}}

• Permanently close the port for a service in the specified zone (like port 80 when in the public zone)

firewall-cmd --permanent --zone={{public}} --remove-service={{http}}

• Reload firewalld to force rule changes to take effect

firewall-cmd --reload