docker-compose

1# Docker Compose
2 
3Orchestrate multi-container applications with declarative YAML configuration.
4 
5## When to Use This Skill
6 
7Use this skill when:
8- Running multi-container applications locally
9- Setting up development environments
10- Defining service dependencies and networking
11- Managing application stacks with multiple services
12- Creating reproducible development setups
13 
14## Prerequisites
15 
16- Docker Engine with Compose plugin (v2)
17- Basic Docker knowledge
18- YAML syntax understanding
19 
20## Basic Configuration
21 
22### Simple Application Stack
23 
24```yaml
25# docker-compose.yml
26version: '3.8'
27 
28services:
29  web:
30    build: .
31    ports:
32      - "3000:3000"
33    environment:
34      - NODE_ENV=development
35      - DATABASE_URL=postgres://postgres:secret@db:5432/myapp
36    depends_on:
37      - db
38      - redis
39 
40  db:
41    image: postgres:15-alpine
42    environment:
43      POSTGRES_USER: postgres
44      POSTGRES_PASSWORD: secret
45      POSTGRES_DB: myapp
46    volumes:
47      - postgres-data:/var/lib/postgresql/data
48    ports:
49      - "5432:5432"
50 
51  redis:
52    image: redis:7-alpine
53    ports:
54      - "6379:6379"
55 
56volumes:
57  postgres-data:
58```
59 
60## Service Configuration
61 
62### Build Options
63 
64```yaml
65services:
66  app:
67    build:
68      context: ./app
69      dockerfile: Dockerfile.dev
70      args:
71        NODE_VERSION: "20"
72      target: development
73      cache_from:
74        - myapp:cache
75    image: myapp:dev
76```
77 
78### Environment Variables
79 
80```yaml
81services:
82  app:
83    environment:
84      - NODE_ENV=production
85…