Day 12 of learning DevOps: Linux Firewall
📰 Medium · DevOps
Learn to configure a Linux firewall using UFW with a step-by-step guide
Action Steps
- Check the firewall status using the UFW command
- Allow SSH connections to prevent lockout
- Enable the firewall and configure default policies
- Allow required services such as HTTP and HTTPS
- Block unwanted services to prevent unauthorized access
Who Needs to Know This
DevOps engineers and system administrators can benefit from this guide to secure their Linux systems
Key Insight
💡 UFW is a user-friendly interface for managing Linux firewalls
Share This
🔒 Secure your Linux system with UFW! 🔒
Key Takeaways
Learn to configure a Linux firewall using UFW with a step-by-step guide
Full Article
Title: Day 12 of learning DevOps: Linux Firewall
URL Source: https://medium.com/@xrsthasakil123/day-12-of-learning-devops-linux-firewall-299745f2ad75?source=rss------devops-5
Published Time: 2026-07-11T14:35:34Z
Markdown Content:
[Sitemap](https://medium.com/sitemap/sitemap.xml)
[Open in app](https://play.google.com/store/apps/details?id=com.medium.reader&referrer=utm_source%3DmobileNavBar&source=---top_nav_layout_nav-----------------------------------------)
Sign up
[Sign in](https://medium.com/m/signin?operation=login&redirect=https%3A%2F%2Fmedium.com%2F%40xrsthasakil123%2Fday-12-of-learning-devops-linux-firewall-299745f2ad75&source=post_page---top_nav_layout_nav-----------------------global_nav------------------)
[](https://medium.com/?source=---top_nav_layout_nav-----------------------------------------)
Get app
[Write](https://medium.com/m/signin?operation=register&redirect=https%3A%2F%2Fmedium.com%2Fnew-story&source=---top_nav_layout_nav-----------------------new_post_topnav------------------)
[Search](https://medium.com/search?source=---top_nav_layout_nav-----------------------------------------)
Sign up
[Sign in](https://medium.com/m/signin?operation=login&redirect=https%3A%2F%2Fmedium.com%2F%40xrsthasakil123%2Fday-12-of-learning-devops-linux-firewall-299745f2ad75&source=post_page---top_nav_layout_nav-----------------------global_nav------------------)
1. [What is a Firewall?](https://medium.com/?source=-----299745f2ad75---------------------------------------#4027 "What is a Firewall?")
2. [Why Should You Use a Firewall?](https://medium.com/?source=-----299745f2ad75---------------------------------------#ef2c "Why Should You Use a Firewall?")
3. [What is UFW?](https://medium.com/?source=-----299745f2ad75---------------------------------------#00b9 "What is UFW?")
4. [Step 1: Check the Firewall Status](https://medium.com/?source=-----299745f2ad75---------------------------------------#83c5 "Step 1: Check the Firewall Status")
5. [Step 2: Allow SSH First](https://medium.com/?source=-----299745f2ad75---------------------------------------#b4ef "Step 2: Allow SSH First")
6. [Step 3: Enable the Firewall](https://medium.com/?source=-----299745f2ad75---------------------------------------#6227 "Step 3: Enable the Firewall")
7. [Step 4: Configure Default Policies](https://medium.com/?source=-----299745f2ad75---------------------------------------#cd63 "Step 4: Configure Default Policies")
8. [Step 5: Allow Required Services](https://medium.com/?source=-----299745f2ad75---------------------------------------#b43e "Step 5: Allow Required Services")
9. [SSH](https://medium.com/?source=-----299745f2ad75---------------------------------------#c496 "SSH")
10. [HTTP](https://medium.com/?source=-----299745f2ad75---------------------------------------#cc2b "HTTP")
11. [HTTPS](https://medium.com/?source=-----299745f2ad75---------------------------------------#fd43 "HTTPS")
12. [Custom Application Port](https://medium.com/?source=-----299745f2ad75---------------------------------------#62d6 "Custom Application Port")
13. [Step 6: Check Your Firewall Rules](https://medium.com/?source=-----299745f2ad75---------------------------------------#20a3 "Step 6: Check Your Firewall Rules")
14. [Step 7: Block Unwanted Services](https://medium.com/?source=-----299745f2ad75---------------------------------------#ccfa "Step 7: Block Unwanted Services")
15. [Step 8: Remove Firewall Rules](https://medium.com/?source=-----299745f2ad75---------------------------------------#6185 "Step 8: Remove Firewall Rules")
16. [Step 9: Allow Connections from a Specific IP](https://medium.com/?source=-----299745f2ad75---------------------------------------#ae5a "Step 9: Allow Connections from a Specific IP")
17. [Step 10: Reset the Firewall](https://medium.com/?source=-----299745f2ad75--------------------------------------
URL Source: https://medium.com/@xrsthasakil123/day-12-of-learning-devops-linux-firewall-299745f2ad75?source=rss------devops-5
Published Time: 2026-07-11T14:35:34Z
Markdown Content:
[Sitemap](https://medium.com/sitemap/sitemap.xml)
[Open in app](https://play.google.com/store/apps/details?id=com.medium.reader&referrer=utm_source%3DmobileNavBar&source=---top_nav_layout_nav-----------------------------------------)
Sign up
[Sign in](https://medium.com/m/signin?operation=login&redirect=https%3A%2F%2Fmedium.com%2F%40xrsthasakil123%2Fday-12-of-learning-devops-linux-firewall-299745f2ad75&source=post_page---top_nav_layout_nav-----------------------global_nav------------------)
[](https://medium.com/?source=---top_nav_layout_nav-----------------------------------------)
Get app
[Write](https://medium.com/m/signin?operation=register&redirect=https%3A%2F%2Fmedium.com%2Fnew-story&source=---top_nav_layout_nav-----------------------new_post_topnav------------------)
[Search](https://medium.com/search?source=---top_nav_layout_nav-----------------------------------------)
Sign up
[Sign in](https://medium.com/m/signin?operation=login&redirect=https%3A%2F%2Fmedium.com%2F%40xrsthasakil123%2Fday-12-of-learning-devops-linux-firewall-299745f2ad75&source=post_page---top_nav_layout_nav-----------------------global_nav------------------)
1. [What is a Firewall?](https://medium.com/?source=-----299745f2ad75---------------------------------------#4027 "What is a Firewall?")
2. [Why Should You Use a Firewall?](https://medium.com/?source=-----299745f2ad75---------------------------------------#ef2c "Why Should You Use a Firewall?")
3. [What is UFW?](https://medium.com/?source=-----299745f2ad75---------------------------------------#00b9 "What is UFW?")
4. [Step 1: Check the Firewall Status](https://medium.com/?source=-----299745f2ad75---------------------------------------#83c5 "Step 1: Check the Firewall Status")
5. [Step 2: Allow SSH First](https://medium.com/?source=-----299745f2ad75---------------------------------------#b4ef "Step 2: Allow SSH First")
6. [Step 3: Enable the Firewall](https://medium.com/?source=-----299745f2ad75---------------------------------------#6227 "Step 3: Enable the Firewall")
7. [Step 4: Configure Default Policies](https://medium.com/?source=-----299745f2ad75---------------------------------------#cd63 "Step 4: Configure Default Policies")
8. [Step 5: Allow Required Services](https://medium.com/?source=-----299745f2ad75---------------------------------------#b43e "Step 5: Allow Required Services")
9. [SSH](https://medium.com/?source=-----299745f2ad75---------------------------------------#c496 "SSH")
10. [HTTP](https://medium.com/?source=-----299745f2ad75---------------------------------------#cc2b "HTTP")
11. [HTTPS](https://medium.com/?source=-----299745f2ad75---------------------------------------#fd43 "HTTPS")
12. [Custom Application Port](https://medium.com/?source=-----299745f2ad75---------------------------------------#62d6 "Custom Application Port")
13. [Step 6: Check Your Firewall Rules](https://medium.com/?source=-----299745f2ad75---------------------------------------#20a3 "Step 6: Check Your Firewall Rules")
14. [Step 7: Block Unwanted Services](https://medium.com/?source=-----299745f2ad75---------------------------------------#ccfa "Step 7: Block Unwanted Services")
15. [Step 8: Remove Firewall Rules](https://medium.com/?source=-----299745f2ad75---------------------------------------#6185 "Step 8: Remove Firewall Rules")
16. [Step 9: Allow Connections from a Specific IP](https://medium.com/?source=-----299745f2ad75---------------------------------------#ae5a "Step 9: Allow Connections from a Specific IP")
17. [Step 10: Reset the Firewall](https://medium.com/?source=-----299745f2ad75--------------------------------------
DeepCamp AI