docker

Containerizing an application with Docker involves creating a Dockerfile that specifies your base image, dependencies, and runtime commands, then building and running the image. Docker packages your application and all its dependencies into a portable container that runs consistently across any system.

Use Docker Compose to define multiple services in a single YAML file, specifying each service's image, ports, volumes, and environment variables. Docker Compose orchestrates all containers together, making it ideal for local development environments with databases, caches, and application servers.

Multi-stage builds reduce image size by using intermediate stages to compile or prepare artifacts, then copying only what's needed into the final stage. This eliminates build tools and unnecessary files from the final image, significantly reducing deployment overhead.

Yes. Docker supports production deployments through best practices like non-root execution, explicit versioning, layer optimization, and CI/CD pipeline integration. These practices ensure security, repeatability, and reliable scaling across production environments.

Docker allows you to create custom networks for container communication and define persistent data volumes for storage. This enables containers to securely communicate and share data without losing information when containers stop or restart.

Security hardening includes running containers as non-root users, using explicit image versions instead of latest tags, minimizing layers and dependencies, and implementing proper network isolation. These practices reduce attack surface and ensure containers follow security best practices.