Docker Compose in Depth

Docker Compose lets you define and run multi-container applications with a single YAML file. This module goes beyond the basics -- covering file structure, secrets management, startup orchestration, multi-environment overrides, and production deployment workflows.

Compose at a Glance

flowchart TD
    subgraph ComposeFile["compose.yaml"]
        direction TB
        S["services:"] --> S1["web"] & S2["api"] & S3["db"]
        N["networks:"] --> N1["front"] & N2["back"]
        V["volumes:"] --> V1["db_data"]
    end

    ComposeFile -->|"docker compose up -d"| Running["Running Stack"]

    style ComposeFile fill:#e3f2fd,stroke:#1565c0
    style Running fill:#e8f5e9,stroke:#2e7d32

What You Will Learn

Lesson	What It Covers
Compose File Structure	Anatomy of a compose file, key properties, and essential commands
Environment Variables and Secrets	Separating config from secrets safely
Dependency Order and Healthchecks	Ensuring services start in the right order
Multi-Environment Overrides	Managing dev, staging, and production with override files
Production Compose Workflow	Deploying, verifying, and rolling back Compose stacks

Prerequisites

• Understand Docker networking and DNS (Module 5)
• Understand volumes and data persistence (Module 6)