If you want to build and push images for multiple architectures in one step, which tool helps?

If you want to build and push images for multiple architectures in one step, which tool helps?

• A. Buildx
• B. Docker Push
• C. Docker Run
• D. Docker Compose

Answer: (A)

Building and pushing images for multiple architectures in one step is enabled by Docker Buildx. Buildx is a Docker CLI tool that extends the BuildKit backend and supports multi-platform builds using the --platform option (for example, linux/amd64 and linux/arm64). You can push the results in the same command with --push, producing and uploading multi-arch images in a single run. It can also use QEMU to emulate other architectures if needed. The other tools don’t provide this combined capability. Docker Push simply uploads an existing image to a registry, Docker Run starts a container, and Docker Compose coordinates multiple containers but isn’t designed for building multi-architecture images in one step.

Building and pushing images for multiple architectures in one step is enabled by Docker Buildx. Buildx is a Docker CLI tool that extends the BuildKit backend and supports multi-platform builds using the --platform option (for example, linux/amd64 and linux/arm64). You can push the results in the same command with --push, producing and uploading multi-arch images in a single run. It can also use QEMU to emulate other architectures if needed.

The other tools don’t provide this combined capability. Docker Push simply uploads an existing image to a registry, Docker Run starts a container, and Docker Compose coordinates multiple containers but isn’t designed for building multi-architecture images in one step.