docker-patterns

Multi-stage builds minimize Docker image size and security surface area by compiling artifacts in one stage and copying only the necessary runtime files to a final, lean production image. This approach reduces build times and strengthens container security.

Docker health checks monitor container runtime status to ensure production reliability. You configure them in your Dockerfile or Docker Compose file to automatically test your application's availability, enabling the orchestrator to restart unhealthy containers without manual intervention.

Running Docker containers as a non-root user strengthens security by preventing privilege escalation attacks. You configure a dedicated user with minimal permissions in your Dockerfile before the application runtime stage to enforce proper user access control.

Docker Compose enables reliable local development and production parity by orchestrating multi-container workflows. You define your application, network, and volume configurations in a compose file to reliably reproduce staging and production environments locally.

Docker builds slow down when layer caching strategies are not optimized. You speed up builds by ordering Dockerfile instructions from least to most frequently changing, ensuring dependencies are cached and only application code modifications trigger new layers.

A .dockerignore file is needed to maintain .dockerignore discipline by excluding local environment files, logs, and source control artifacts from the Docker build context. This practice minimizes image size and prevents sensitive data from leaking into production images.