How to Install and Use firewall-cmd on Ubuntu

In this tutorial, we will guide you through the process of installing and using the firewall-cmd command on Ubuntu. firewall-cmd is a command-line utility that provides a dynamic firewall management for Linux systems. It allows users to configure firewall rules and settings in a user-friendly manner.

What is firewall-cmd?

firewall-cmd is a part of the firewalld firewall management solution. It is used to manage the firewall rules and settings on Linux systems. With firewall-cmd, users can easily add, remove, or modify firewall rules without the need to manually edit configuration files. This makes it a convenient tool for system administrators to secure their systems and control network traffic.

Installing firewall-cmd on Ubuntu

To install firewall-cmd on Ubuntu, you can follow these steps:

1. Open a terminal window on your Ubuntu system.
2. Update the package repository to ensure you have the latest information about available packages:

   sudo apt update
   

3. Install the firewalld package, which includes firewall-cmd:

   sudo apt install firewalld
   

Once the installation is complete, you can start using firewall-cmd to manage your firewall settings.

Using firewall-cmd

Here are some common commands that you can use with firewall-cmd:

• To list all the currently active zones:

  sudo firewall-cmd --get-active-zones
  

• To add a new firewall rule to allow incoming traffic on a specific port (e.g., port 80):

  sudo firewall-cmd --zone=public --add-port=80/tcp --permanent
  

• To reload the firewall configuration after making changes:

  sudo firewall-cmd --reload
  

These are just a few examples of how you can use firewall-cmd to manage your firewall settings on Ubuntu.

Conclusion

In conclusion, firewall-cmd is a powerful tool for managing firewall settings on Linux systems. By using firewall-cmd, users can easily configure firewall rules and control network traffic without the need for manual editing of configuration files. This makes it a valuable tool for securing systems and maintaining network security.

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