docker

Optimize a Dockerfile by implementing multi-stage builds to separate build dependencies from the runtime environment, using smaller base images like Alpine Linux, and cleaning up temporary build artifacts to reduce image size and speed up builds.

A multi-stage build is a Docker technique that separates the build environment from the final runtime image. Use it to create small, production-ready images by excluding unnecessary build dependencies and artifacts from the final output.

Define a multi-container application by creating a docker-compose.yml file that specifies services, networks, and volumes. This allows you to easily manage complex setups, such as running a Node.js application alongside a PostgreSQL database.

Security hardening in Docker involves implementing non-root users, managing secrets securely, and performing image scanning. These practices minimize vulnerabilities and protect containerized applications during production deployment.

Yes, Docker Compose is designed to define and manage multi-container setups. You can configure a docker-compose.yml file to run your application alongside a database like PostgreSQL, streamlining local development and testing environments.