Added Docker Compose Cheatsheets and docker-compose.yml Master Template

Author: saiusesgithub

Cheatsheets/Docker Compose Cheatsheets/1. Docker Compose Commands.md

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+Modern Docker uses docker compose (plugin)
+Older versions used docker-compose
+
+Core Lifecycle Commands
+
+Start services
+
+```bash
+docker compose up
+docker compose up -d
+docker compose up --build
+docker compose up -d --build
+docker compose up --force-recreate
+docker compose up --no-recreate
+docker compose up --remove-orphans
+docker compose up -d --remove-orphans
+```
+
+Stop services
+```bash
+docker compose stop
+docker compose stop web
+```
+
+Start stopped services
+```bash
+docker compose start
+docker compose start web
+```
+
+Restart services
+```bash
+docker compose restart
+docker compose restart web
+```
+
+Shutdown and remove
+
+```bash
+docker compose down
+docker compose down -v
+docker compose down --rmi all
+docker compose down --remove-orphans
+docker compose down --volumes --remove-orphans
+```
+
+Build Commands
+```bash
+docker compose build
+docker compose build web
+docker compose build --no-cache
+docker compose build --pull
+```
+
+Logs
+```bash
+docker compose logs
+docker compose logs -f
+docker compose logs web
+docker compose logs -f web
+docker compose logs --tail=100
+docker compose logs --timestamps
+```
+
+Process / Status
+```bash
+docker compose ps
+docker compose top
+docker compose config
+docker compose ls
+```
+
+Exec into service
+```bash
+docker compose exec web bash
+docker compose exec web sh
+docker compose exec web ls -la
+```
+
+Run one-off command
+```bash
+docker compose run web bash
+docker compose run --rm web bash
+docker compose run --service-ports web
+```
+
+Pull / Push
+```bash
+docker compose pull
+docker compose pull web
+docker compose push
+docker compose push web
+```
+
+Scaling
+```bash
+docker compose up --scale web=3
+docker compose up -d --scale api=5
+```

Cheatsheets/Docker Compose Cheatsheets/2. Compose File Structure.md

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+Minimal Compose File
+
+```yml
+version: "3.9"
+
+services:
+  web:
+    image: nginx
+    ports:
+      - "8080:80"
+```
+
+Full Structure Layout
+```yml
+version: "3.9"
+
+services:
+  service_name:
+    image:
+    build:
+    container_name:
+    ports:
+    environment:
+    env_file:
+    volumes:
+    networks:
+    depends_on:
+    restart:
+    command:
+    entrypoint:
+    working_dir:
+    user:
+    healthcheck:
+    deploy:
+    logging:
+
+volumes:
+  volume_name:
+
+networks:
+  network_name:
+```

Cheatsheets/Docker Compose Cheatsheets/3. Services Configuration.md

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+Image vs Build
+
+Using prebuilt image
+```yml
+services:
+  web:
+    image: nginx:latest
+```
+
+Using Dockerfile
+```yml
+services:
+  api:
+    build: .
+```
+
+
+Build with context and Dockerfile
+```yml
+services:
+  api:
+    build:
+      context: .
+      dockerfile: Dockerfile
+```
+
+Ports
+```yml
+ports:
+  - "8080:80"
+  - "127.0.0.1:5000:5000"
+```
+
+Format:
+```
+HOST:CONTAINER
+```
+
+Restart Policies
+```yml
+restart: "no"
+restart: always
+restart: unless-stopped
+restart: on-failure
+restart: on-failure:5
+```
+
+Depends On
+```yml
+depends_on:
+  - db
+```
+
+⚠️ Only controls startup order
+Does NOT wait for DB to be “ready”
+
+Command Override
+```yml
+command: ["npm", "start"]
+command: python app.py
+```
+
+Entrypoint Override
+```yml
+entrypoint: ["./entrypoint.sh"]
+```
+
+Working Directory
+```yml
+working_dir: /app
+```
+
+Container Name
+```yml
+container_name: my-custom-container
+```

Cheatsheets/Docker Compose Cheatsheets/4. Networking.md

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+Default Behavior
+
+Compose automatically:
+Creates a network
+Attaches all services
+Enables service-to-service DNS
+
+Example:
+
+http://db:5432
+
+Custom Network
+```yml
+networks:
+  backend:
+```
+
+Attach to service:
+```yml
+services:
+  api:
+    networks:
+      - backend
+      - frontend # multiple networks
+```
+
+Define Network
+
+```yml
+networks:
+  backend:
+    driver: bridge
+```

Cheatsheets/Docker Compose Cheatsheets/5. Volumes.md

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+Named Volume
+
+```yml
+services:
+  db:
+    image: postgres
+    volumes:
+      - pgdata:/var/lib/postgresql/data
+
+volumes:
+  pgdata:
+```
+
+Bind Mount
+```yml
+volumes:
+  - ./app:/app
+```
+
+Read-only
+```yml
+volumes:
+  - ./app:/app:ro
+```
+
+Multiple Volumes
+```yml
+volumes:
+  - pgdata:/var/lib/postgresql/data
+  - ./backup:/backup
+```

Cheatsheets/Docker Compose Cheatsheets/6. Environments and Secrets.md

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+
+Environment Inline
+```yml
+environment:
+  - NODE_ENV=production
+  - PORT=5000
+```
+
+OR
+
+```yml
+environment:
+  NODE_ENV: production
+  PORT: 5000
+```
+
+env_file
+```yml
+env_file:
+  - .env
+  - prod.env
+```
+
+Docker Compose automatically reads:
+.env
+
+In same directory.
+
+Secrets (Swarm mode mainly)
+```yml
+secrets:
+  mysecret:
+    file: ./secret.txt
+```
+
+Attach:
+```yml
+services:
+  api:
+    secrets:
+      - mysecret
+```

Cheatsheets/Docker Compose Cheatsheets/7. Build and Images.md

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+
+Build args
+```yml
+build:
+  context: .
+  args:
+    NODE_ENV: production
+```
+
+Multi-stage awareness
+
+Compose just triggers Docker build.
+Multi-stage defined in Dockerfile.
+
+Force rebuild
+```bash
+docker compose build --no-cache
+docker compose up --build
+```

Cheatsheets/Docker Compose Cheatsheets/8. Debugging and Troubleshooting.md

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+
+Logs
+```bash
+docker compose logs -f
+```
+Restart specific service
+```bash
+docker compose restart api
+```
+Recreate single service
+```bash
+docker compose up -d --force-recreate api
+```
+Remove unused resources
+```bash
+docker compose down -v
+docker system prune
+```