This page is about the configuration of firewalld
Configurations are stored in files located in 2 directories: 1):
By default, all configurations created with the command line or GUI are not permanent. They are lost when the host reboots. When you have tested your rule, you need to switch them to permanent and recreate them with the –permanent option
firewall-cmd --zone=public --permanent --list-services
firewall-cmd --runtime-to-permanent
You can enable an option for a time interval.
Example: Enable a service in a zone for 30 seconds
firewall-cmd [--zone=<zone>] --add-service=<service> --timeout=30
firewall-offline-cmd --check-config