Linux Intermediate

What is Firewalld?

A dynamic firewall management tool for Linux that provides a D-Bus interface for managing firewall rules with zones.

Firewalld uses zones to define trust levels for network connections. Common zones include public (default, restrictive), trusted (allow all), and internal (trusted internal network). Rules can be added permanently or for the current session only.

Commands: firewall-cmd --add-port=80/tcp --permanent (open port), firewall-cmd --add-service=http --permanent (allow service), firewall-cmd --reload (apply changes). Firewalld replaces iptables on RHEL/CentOS/Fedora systems.

Related Terms

Package Manager

A tool that automates the process of installing, updating, configuring, and removing software packages.

A fast, versatile file synchronization tool that efficiently transfers and syncs files between local and remote systems.

The time specification format used in cron job scheduling, with five fields defining minute, hour, day of month, month, and day of week.

A utility that manages automatic rotation, compression, and removal of log files to prevent disk space exhaustion.

A command that builds and executes commands from standard input, useful for processing lists of items.

A running instance of a program, with its own memory space, process ID, and system resources.

View All Linux Terms →