Docker Compose Tutorial for Beginners Multi Container Todo App with Frontend, Backend & PostgreSQL

In this video, we build a complete multi-container Todo application using Docker Compose and understand how the containers communicate with each other. Instead of running every container manually with multiple docker run commands, we'll define the entire application architecture in a single docker-compose.yml file and start everything with one command. 🚀 What We Build Our application contains three services: Browser ↓ Frontend — Nginx ↓ Backend — Python Flask ↓ Database — PostgreSQL 📦 Topics Covered What is Docker Compose? Understanding services in Docker Compose Creating a multi-container application Frontend container with Nginx Backend container with Flask PostgreSQL database container Docker Compose networking How containers communicate with each other Docker service-name-based DNS backend:5000 vs localhost:5000 db:5432 communication Docker named volumes PostgreSQL data persistence Understanding init.sql depends_on PostgreSQL health checks Port mapping Manual docker run vs Docker Compose Starting the complete application with one command 🐳 Docker Compose Architecture Docker Network │ ┌───────────────┼────────────────┐ │ │ │ ▼ ▼ ▼ Frontend Backend Database Nginx Flask PostgreSQL :80 :5000 :5432 │ │ │ └────── HTTP ───┘ │ │ │ └── db:5432 ─────┘ ▶️ Start the Application Clone/download the project and run: docker compose up --build Then open: http://localhost:8080 Check running services: docker compose ps Stop the application: docker compose down 📁 Project Structure todo-compose-app/ │ ├── docker-compose.yml │ ├── frontend/ │ ├── Dockerfile │ ├── nginx.conf │ └── index.html │ ├── backend/ │ ├── Dockerfile │ ├── requirements.txt │ └── app.py │ └── database/ └── init.sql 🎯 Key Concept The main idea of this project is: Docker runs containers. Docker Compose defines and orchestrates multiple containers as one application. By the end of the video, you'll understand not only how to write a docker-compose.yml, but also how the frontend, backend, database, network, and persistent storage work together. #Docker #DockerCompose #DevOps #Containerization #Python #Flask #PostgreSQL #Nginx #Backend #Frontend #DevOpsTutorial #DockerTutorial #CloudComputing #DockerNetworking   / rishab-raj-   https://github.com/RishOpss