Securing a Linux Server on DigitalOcean | SSH Hardening, UFW, Fail2Ban, LXD & Nginx

Описание: In this video, I demonstrate a complete Linux server security and isolation setup
on DigitalOcean, performed as part of a real DevOps assignment.

The goal of this project is to secure a Linux VM using industry best practices,
and then extend it with container isolation using LXD.



📌 Full documentation and configuration files are available on GitHub.
https://github.com/Mukulkalsait/A_2_D...

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🔧 WHAT’S COVERED
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• DigitalOcean Ubuntu VM creation
• SSH key-based authentication
• User management & sudo configuration
• SSH hardening (root login disabled, password auth disabled)
• Firewall setup using UFW
• Brute-force protection with Fail2Ban
• Automatic security updates
• Nginx deployment on host VM
• LXD installation & container setup
• Nginx running inside LXD container
• Host ↔ Container port proxy using LXD
• Clear separation of host vs container services

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📁 DOCUMENTATION & CODE
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GitHub Repository:
https://github.com/Mukulkalsait/A_2_D...

The repository contains:
• Complete step-by-step documentation README.md
• SSH, UFW, and Fail2Ban configuration files
• Commands used during the setup

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ℹ️ NOTE
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During the interview discussion, LXD/LXC was mentioned as a possible requirement.
While the core task focused on Linux server security, I have included LXD as an
optional enhancement to demonstrate container isolation and real-world architecture.

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📌 ABOUT
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This setup mirrors a production-style Linux server environment commonly used
by DevOps and SRE teams.

If you’re preparing for:
• DevOps interviews
• Linux administration roles
• Cloud infrastructure projects

— this walkthrough should be useful.

Thanks for watching!