Docker Compose — Introduction

Welcome to Chapter 1 of the Docker Compose tutorial. This chapter introduces Docker Compose — what it is, why it exists, and when you should use it.

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Topics in This Chapter

#	Topic	Description
1	What is Docker Compose	The problem Compose solves and how it works
2	Compose V1 vs V2	History, differences, and migration
3	When to Use Compose	Use cases and when NOT to use Compose
4	Compose vs Docker Run	Side-by-side comparison
5	Compose Ecosystem	Tools, integrations, and community

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What You’ll Learn

By the end of this chapter, you’ll understand:

• What Docker Compose is and the problem it solves
• The difference between Compose V1 and V2
• When to use (and when NOT to use) Compose
• How Compose compares to running docker run commands manually
• The Compose ecosystem and related tools

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Key Concepts Preview

┌─────────────────────────────────────────────────────┐
│                    compose.yml                       │
│                                                     │
│  ┌──────────┐  ┌──────────┐  ┌──────────┐         │
│  │  web      │  │  api      │  │  db       │         │
│  │  (nginx)  │  │  (node)   │  │ (postgres)│         │
│  └────┬─────┘  └────┬─────┘  └────┬─────┘         │
│       │              │              │               │
│       └──────────────┴──────────────┘               │
│                 shared network                       │
└─────────────────────────────────────────────────────┘

        One file. One command. All containers.

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Learning Objectives

After completing this chapter, you should be able to:

1. Explain Docker Compose in one sentence
2. Describe the problem Compose solves
3. Differentiate between Compose V1 and V2
4. List 3 scenarios where Compose is the right tool
5. List 2 scenarios where Compose is NOT the right tool

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