docker-operations

# Docker Operations Skill This skill provides comprehensive guidance for all Docker operations in this project. ## When to Use This Skill Use this skill when the user requests any Docker-related operation: - Building Docker images - Running containers - Managing container lifecycle (start, stop, restart, remove) - Viewing container logs - Working with Docker Compose - Inspecting containers and images - Docker cleanup operations ## Core Operations ### Building Images ```bash # Build from Dockerfile in current directory docker build -t <image-name>:<tag> . # Build with specific Dockerfile docker build -f Dockerfile.prod -t <image-name>:<tag> . # Build with build arguments docker build --build-arg NODE_ENV=production -t <image-name>:<tag> . ``` ### Running Containers ```bash # Run in detached mode docker run -d --name <container-name> <image-name> # Run with port mapping docker run -d -p <host-port>:<container-port> <image-name> # Run with volume mount docker run -d -v <host-path>:<container-path> <image-name> # Run with environment variables docker run -d -e VAR_NAME=value <image-name> # Run interactively docker run -it --rm <image-name> /bin/sh ``` ### Container Management ```bash docker ps # List running containers docker ps -a # List all containers docker stop <container> # Stop a container docker start <container> # Start a stopped container docker restart <container> # Restart a container docker rm <container> # Remove a container docker rm -f <container> # Force remove running container ``` ### Logs and Inspection ```bash docker logs <container> # View logs docker logs -f <container> # Follow logs docker logs --tail 100 <container> # Last 100 lines docker inspect <container> # Full container details docker stats # Resource usage ``` ### Image Management ```bash docker images # List images docker pull <image> # Pull from registry docker push <image> # Push to registry docker rmi <image> # Remove image docker tag <src> <dest> # Tag an image ``` ## Docker Compose Operations ```bash docker-compose up # Start services docker-compose up -d # Start in detached mode docker-compose up --build # Rebuild and start docker-compose down # Stop and remove docker-compose down -v # Also remove volumes docker-compose logs # View all logs docker-compose logs <service> # View service logs docker-compose ps # List services docker-compose exec <svc> sh # Execute in service ``` ## Cleanup Operations ```bash docker system prune # Remove unused data docker system prune -a # Remove all unused images docker volume prune # Remove unused volumes docker network prune # Remove unused networks docker container prune # Remove stopped containers ``` ## Additional Resources ### Reference Files - **`references/docker-commands.md`** - Complete Docker CLI reference - **`references/docker-compose.md`** - Docker Compose configuration guide ### Examples - **`examples/Dockerfile.example`** - Sample Dockerfile for Node.js apps - **`examples/docker-compose.example.yml`** - Sample Docker Compose file ### Scripts - **`scripts/docker-check.sh`** - Verify Docker installation and status ## Best Practices 1. **Always use specific tags** - Avoid using `latest` in production 2. **Use multi-stage builds** - Reduce image size 3. **Don't run as root** - Use USER directive in Dockerfile 4. **Use .dockerignore** - Exclude unnecessary files 5. **Health checks** - Add HEALTHCHECK to Dockerfiles 6. **Resource limits** - Set memory and CPU limits in production