Controlling the firewalld Service

In Oracle Linux 8, the firewall service, firewalld, is enabled by default. The service is controlled by the systemctl command.

To start the service:

sudo systemctl unmask firewalld

sudo systemctl start firewalld

To ensure that the service starts automatically when the system starts, run the following command after starting the firewall:

sudo systemctl enable firewalld

To stop the firewall service and prevent it from automatically starting when the system starts, run the following command:

sudo systemctl stop firewalld

sudo systemctl disable firewalld

To prevent the firewall service from being started by other services or through the firewalld D-Bus interface, run the following command after disabling the firewall:

sudo systemctl mask firewalld

To display the current status of the firewall service:

sudo systemctl status firewalld

firewalld.service - firewalld - dynamic firewall daemon
   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
   Active: active (running) since Wed 2022-04-20 18:33:59 BST; 2 weeks 5 days ago
     Docs: man:firewalld(1)
 Main PID: 4261 (firewalld)
    Tasks: 3 (limit: 99538)
   Memory: 4.7M
   CGroup: /system.slice/firewalld.service
           └─4261 /usr/libexec/platform-python -s /usr/sbin/firewalld --nofork --nopid