Reload firewall settings

firewall-cmd --reload

Interfaces

Bind an interface “eth0” to the default zone.

firewall-cmd --add-interface=eth0 --permanent

Bind an interface “eth0” to a specific zone “public”

firewall-cmd --zone=public --add-interface=eth0 --permanent

Services

Add a service to default zone

firewall-cmd --add-service https --permanent

Add a service to a specific zone “public”

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

Ports

Open a port within the default zone

firewall-cmd --add-port 1521/tcp --permanent

Open a port within a specific zone “public”

firewall-cmd --zone=public --add-port 1521/tcp --permanent

Remove a port from a specific zone “public”

firewall-cmd --remove-port 1521/tcp --permanent

Getting Information

List all defined zones

firewall-cmd --get-zones

Get the default zone

firewall-cmd --get-default-zone

List active zones

firewall-cmd --get-active-zones

Get data of a specific zone “public”

firewall-cmd --info-zone=public