How to Install Firewalld on CentOS 8


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Installing Firewalld on CentOS 8

Firewalld is a dynamic firewall management tool that comes pre-installed on CentOS 8. It provides a convenient way to manage and configure firewall rules and settings on a Linux system. Firewalld offers a more user-friendly interface compared to the traditional iptables command.

Step 1: Updating the System

Before installing Firewalld, it is recommended to update the system's package repositories and installed packages. Open a terminal and run the following commands:

$ sudo dnf update

Step 2: Installing Firewalld

To install Firewalld, run the following command in the terminal:

$ sudo dnf install firewalld

Step 3: Starting and Enabling Firewalld

After the installation completes, start and enable the Firewalld service by executing the following commands:

$ sudo systemctl start firewalld
$ sudo systemctl enable firewalld

Step 4: Basic Firewalld Commands

Once Firewalld is installed and running, you can use various commands to manage firewall rules:

  • sudo firewall-cmd --state: Check if Firewalld is running.
  • sudo firewall-cmd --list-all: Display all active firewall rules.
  • sudo firewall-cmd --get-active-zones: Show active firewall zones.
  • sudo firewall-cmd --zone=public --add-service=http --permanent: Allow HTTP traffic in the public zone.
  • sudo firewall-cmd --reload: Apply changes made to the firewall rules.

Step 5: Configuring Additional Firewall Rules

You can configure specific firewall rules by using the firewall-cmd command. For example, to allow SSH connections, run the following:

$ sudo firewall-cmd --zone=public --add-service=ssh --permanent

Remember to reload the Firewall after making any changes for them to take effect:

$ sudo firewall-cmd --reload

By following these steps, you have successfully installed and started Firewalld on CentOS 8. You can now use Firewalld to manage and control the firewall settings according to your needs.

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