Not long ago, when the certificate for the hesapciyiz.com site I host on my own VPS expired, I woke up to an email in the middle of the night. Yes, Let's Encrypt's certificate had expired, and I had forgotten to renew it. This situation highlighted how tiring and error-prone manual certificate management can be. ℹ️ The Problem with Manual Renewals Manual certificate renewal is a common pitfall for many. You might forget, or the process itself can be complex, especially when dealing with multiple domains or services. This is where automation becomes not just a convenience, but a necessity. This incident was the catalyst for me to implement an automated SSL certificate renewal system for my Nginx and Docker setup. In this guide, I'll walk you through the exact steps I took, the commands I used, and the challenges I overcame. Why Automate? Before diving into the technical details, let's quickly touch upon why automation is crucial here: Reliability: Automated systems don't forget.…