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Docker Buildx

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description Docker Buildx Overview

Docker Buildx is a CLI plugin that expands the Docker build process. It enables the creation of container images suitable for multiple platforms including Linux, macOS, and Windows. Utilizing BuildKit, it facilitates faster builds through parallelization and remote builder support. This tool benefits developers and system administrators involved in building and deploying containerized applications across diverse environments.

help Docker Buildx FAQ

What does Docker Buildx do that normal docker build does not?

Buildx exposes BuildKit features through Docker's command line, including multi-platform builds, cache exporters, and builder instances. The common command is `docker buildx build`, often with flags like `--platform linux/amd64,linux/arm64`.

How do I build one image for both Intel and ARM machines with Buildx?

You create or select a Buildx builder, then run a multi-platform build with `--platform linux/amd64,linux/arm64`. If you push to a registry, Docker creates a manifest list so Apple Silicon, Raspberry Pi, and x86 servers can pull the right image.

Why does Buildx use QEMU?

QEMU lets a build machine emulate a different CPU architecture, such as building ARM64 images from an x86 laptop. It is convenient, but native builders or remote ARM machines are usually faster for large builds.

What is the difference between docker buildx bake and buildx build?

`buildx build` is the direct single-build command, while `buildx bake` reads build definitions from files such as `docker-bake.hcl` or Compose files. Bake is useful when a project has several images, targets, platforms, and cache rules.

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