Linux Firewall Explained for DevOps | firewalld, iptables & Troubleshooting
Linux Firewall Explained for DevOps | firewalld, iptables & Troubleshooting
Firewall issues are one of the most common causes of production outages in DevOps. Your service is running, DNS works, but traffic still fails. In many cases, the Linux firewall is the root cause.
In this video, you will learn how Linux firewall works using firewalld and iptables, and how packet filtering happens inside the Linux kernel.
This tutorial focuses on real DevOps troubleshooting using practical commands.
Topics covered:
• How Linux firewall packet filtering works
• firewalld explained with real examples
• How to check firewall status and zones
• How to allow ports using firewall-cmd
• iptables explained for DevOps engineers
• INPUT, OUTPUT, FORWARD chains explained
• How Kubernetes uses iptables internally
• DevOps firewall troubleshooting workflow
This video is part of the Linux for DevOps series.
If you want to become strong in Docker, Kubernetes, and DevOps, understanding Linux firewall is essential.
▬▬▬▬▬▬▬ Timestamps ▬▬▬▬▬▬▬
00:00 - Introduction: Why Firewall Issues Break DevOps Systems
00:33 - How Linux Firewall Packet Filtering Works (Basic Concept)
01:16 - firewalld Tutorial: Check Status, Zones, and Allow Ports
03:00 - iptables Explained: How Linux Actually Filters Packets
03:44 - INPUT, OUTPUT, FORWARD Chains Explained (Visual Guide)
04:18 - DevOps Firewall Troubleshooting Mindset + Outro
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