Install and Use Firewalld in Ubuntu
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Firewalls are an essential tool for protecting your computer or network from unauthorized access and malicious attacks. Firewalld is a firewall management tool that provides a user-friendly interface for managing firewalls on Linux systems. In this article, we will cover everything you need to know to install and use Firewalld in Ubuntu.
What is Firewalld?
Firewalld is a firewall management tool that provides a user-friendly interface for managing firewalls on Linux systems. It is designed to work with the Netfilter framework in the Linux kernel, which is responsible for filtering network traffic. Firewalld uses a zone-based approach to manage firewall rules, where each zone represents a level of trust for network traffic.
Installing Firewalld in Ubuntu
Before we can start using Firewalld, we need to install it on our Ubuntu system. Installing Firewalld is a straightforward process, and we can do it using the apt package manager.
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graph TD; A[Install Firewalld] –> B[Update apt package list]; B –> C[Install Firewalld package];
To install Firewalld, follow these steps:
- Open a terminal window by pressing Ctrl+Alt+T.
- Update the apt package list by running the following command:
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sudo apt update
- Install the Firewalld package by running the following command:
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sudo apt install firewalld
Basic Firewall Configuration with Firewalld
Once we have installed Firewalld, we can start using it to manage our firewall rules. In this section, we will cover some basic firewall configurations using Firewalld.
Enabling Firewalld service
Before we can start using Firewalld, we need to enable its service on our system. To do this, run the following command:
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graph TD; A[Enable Firewalld service] –> B[Start Firewalld service];
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sudo systemctl enable firewalld sudo systemctl start firewalld
Listing Firewalld Zones
Firewalld uses a zone-based approach to manage firewall rules, where each zone represents a level of trust for network traffic. By default, Firewalld comes with several predefined zones that we can use to manage firewall rules.
To list the available Firewalld zones, run the following command:
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graph TD; A[List Firewalld Zones] –> B[List zones command]; B –> C[Output list of available zones];
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Setting Default Zone
By default, Firewalld uses the public zone as the default zone for managing firewall rules. We can change the default zone to any other available zone by running the following command:
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graph TD; A[Set Default Zone] –> B[Set default zone command];
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sudo firewall-cmd —set–default-zone=zone-name
Replace zone-name with the name of the zone that you want to set as the default.
Adding Firewall Rules
We can add firewall rules to Firewalld using the firewall-cmd command. The basic syntax for adding a firewall rule is as follows:
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graph TD; A[Add Firewall Rules] –> B[Add rule command];
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sudo firewall-cmd –zone=zone-name –add-rule=rule
Replace zone-name with the name