Docker Compose

Managing containers manually becomes difficult quickly.

Docker Compose solves this problem.

Compose allows defining entire applications in YAML.

Example Problem

Running manually:

docker run nginx
docker run postgres
docker run redis

This becomes messy.

Docker Compose Solution

Example:

services:
  web:
    image: nginx

  db:
    image: postgres

  redis:
    image: redis

Start everything:

docker compose up

Visual Overview

docker-compose.yml
        ↓
+----------------------+
| nginx container      |
| postgres container   |
| redis container      |
+----------------------+

Why Compose Is Important

Compose simplifies:

• self-hosting
• local development
• microservices
• testing environments

Very important for beginners.

Common Docker Compose Commands

Start services:

docker compose up

Run in background:

docker compose up -d

Stop services:

docker compose down

View logs:

docker compose logs