Course 31 - Dive Into Docker | Episode 9: Orchestrating Multi-Container Web Applications with Docker Compose

In this lesson, you’ll learn about: Docker Compose, multi-container apps, and service orchestration1. What is Docker Compose?

Docker Compose is a tool used to:
- Define
- Run
- Manage
multi-container applications using a single command

👉 Instead of long docker run commands, you describe everything in one file2. The docker-compose.yml File

Example structure:version: "3" services: web: build: . redis: image: redis

3. Defining Services

Example:

🔹 Build vs Image

web: build: . redis: image: redis 4. Port Mappingports: - "5000:5000"

👉 Allows access from your browser (localhost)5. Volumes (Data Management)🔹 Host-Mounted Volumevolumes: - .:/app

🔹 Named Volumevolumes: - redis-data:/data volumes: redis-data:

6. Managing Service Dependenciesdepends_on: - redis

👉 Important for backend-dependent services7. Environment Variables with .env

COMPOSE_PROJECT_NAME=myapp Benefits:

🔹 COMPOSE_PROJECT_NAME

👉 Useful when running multiple apps on the same machine8. Running Everything with One Commanddocker-compose up

9. Why Docker Compose Matters

Key Takeaways

Docker Compose = multi-container management made easy
docker-compose.yml = your infrastructure blueprint
Supports:
- Services
- Volumes
- Networks
- Environment variables
One command replaces dozens of manual steps

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