CreatorCopilot Part 4 Connecting FastAPI Auth Service with PostgreSQL using Docker Compose

In Part 4 of the CreatorCopilot series, we containerise our FastAPI Auth Microservice and connect it to a dedicated PostgreSQL database using Docker Compose. We move away from localhost database connections and implement a production-style containerised architecture. You will learn how to configure Docker networks, set up proper database health checks (depends_on), manage environment variables for isolated containers, and use Docker volumes for data persistence. What's covered in this video: • Writing a Dockerfile for a FastAPI microservice • Setting up a standalone PostgreSQL container in docker-compose.yml • Configuring Docker networks for internal container communication • Handling Postgres connection errors and hostnames • Implementing health checks to sequence container startups Timestamps: 00:00 Introduction & Recap 00:43 Main Focus: Connecting Microservices in Docker Compose 01:38 Explaining the Architecture & Networking Concepts 02:40 Modifying .env Values for Docker 04:02 Creating .env.db for the Postgres Container 05:44 Writing the Dockerfile for the Auth Service 07:56 Adding Postgres Service (db_auth) to docker-compose.yml 10:04 Understanding Container Networking & Hostnames 10:41 Configuring Docker Volumes 12:06 Adding Auth Service to docker-compose.yml 12:35 Explaining depends_on and Health Checks 14:27 Visualizing the Docker Compose Boot Sequence 16:43 Running docker compose up --build 17:34 Observing the Build Process in the Terminal 19:02 Troubleshooting Connection Errors (Important Note) 20:04 Testing the Endpoints using curl 21:18 Outro & What's Next Prerequisites: Make sure you have watched Part 3 where we built the standalone FastAPI Auth Service:    • FastAPI Login System with Google OAuth & J...   Next Steps: In Part 5, we will connect the Next.js frontend (Auth.js) to this FastAPI backend gateway. Connect with me: GitHub: https://github.com/sagarsangwan/code-... #FastAPI #Docker #PostgreSQL #Microservices #Python #BackendEngineering #DockerCompose #codingbysagar #sagarsangwan