Dockerfiles & Builds

Learn how docker build transforms a Dockerfile into an immutable OCI image. Discover key concepts like build context, layers, and the build cache.

Learn fundamental Dockerfile instructions like FROM, WORKDIR, and COPY. Understand how to choose base images, set working directories, and add files.

Understand how Docker image layers and union filesystems like OverlayFS work. Learn about copy-on-write, content-addressed layers, and how layer order impacts cache hits

Learn how multi-stage builds optimize Docker images by compiling in a builder stage and shipping only artifacts in a lean runtime image.

Build multi-architecture Docker images with buildx. Create a manifest list for amd64 and arm64, then build and push in one command.

Learn how to use .dockerignore to optimize Docker build contexts. Exclude unnecessary files like .git, node_modules, and secrets to speed up builds and enhance security.

Learn to run containers as non-root users using the USER directive and correct file ownership to enhance security and reduce risk.

Optimize Dockerfiles for production. Learn to build fast, small, and secure images by ordering layers, pinning digests, and selecting minimal base images.

A single-page roundup of every highlight bullet from the 10 pages in the Dockerfiles & Builds section, grouped by source page so you can scan all 58 takeaways without opening each article individually.