Docker Compose for Flask + Postgres + Nginx | Debugging YAML Mistakes [Docker-HomeLab EP6 | 2025]

Описание: 🎯 Why This Matters
Docker Compose is the go-to tool for running multi-container apps. But one tiny YAML mistake can bring your entire stack down.
In this episode, we’ll Dockerize a Flask app with Postgres + Nginx reverse proxy — and deliberately break it to debug real-world issues.

📌 What You’ll Learn in This Video
👉 Basics of Docker Compose: how services connect and share networks
👉 Building a 3-service stack: Flask app + Postgres DB + Nginx reverse proxy
👉 Debugging YAML mistakes: wrong indentation, missing fields, bad configs
👉 How Docker Compose networks work behind the scenes
👉 Real-world best practices: service dependencies, .env files, and configs

📌 Hands-On Demo Includes
✅ Writing a working docker-compose.yml live
✅ Running the full stack with one command
✅ Breaking the YAML on purpose (indentation + missing fields)
✅ Debugging the error step by step until the stack runs again

📌 Why This Episode Stands Out
Most tutorials show you the happy path. I’ll show you what happens when things go wrong — and how to fix them like a DevOps engineer.

👉 Watch the full playlist here: [Docker HomeLab Series Playlist]
👉 Get 24+ reproducible DevOps labs + future guides by subscribing:
learnwithdevopsengineer.beehiiv.com/subscribe

📌 Takeaway Command

docker-compose up -d
docker-compose ps


💡 One YAML mistake → ❌ error. Correct indentation → ✅ working stack.

👋 Final Note
If this helped, smash the like button, share with your DevOps friends, and subscribe for the next episodes.

🚀 Get 24+ reproducible DevOps labs + future guides by subscribing:
👉 learnwithdevopsengineer.beehiiv.com/subscribe

🔔 Subscribe for more Docker, Kubernetes, Jenkins, and Terraform debugging labs.

Subscribe to my newsletter for exclusive scripts, config files, and my full incident response playbook!
https://learnwithdevopsengineer.beehi...

🔗 Full scripts and guides only for subscribers

DevOps Home Lab Bootcamp – Build Real Skills at Home -    • DevOps Home Lab Bootcamp – Build Real Skil...  

DevOps in Production: Real-World Simulations -    • DevOps in Production: Real-World Simulations  

DevOps in Action: Real Incidents, Debugging & Automation -    • DevOps in Action: Real Incidents, Debuggin...  

Github Repo - https://github.com/learnwithdevopseng...

** Chapters **
00:00 Intro – Why Docker Compose?
00:37 One File, One Command
02:00 Project Setup (Flask, Postgres, Nginx)
05:00 Writing Docker Compose YAML
08:00 Debugging Common Mistakes
13:00 Fixing Database Connection Errors
15:00 Nginx Misconfiguration & Bad Gateway
17:20 Recap – Docker Compose Benefits
18:00 Next Episode Preview