What is a primary advantage of Docker Buildx over Docker Build?

What is a primary advantage of Docker Buildx over Docker Build?

• A. Buildx reduces image size by default
• B. Buildx simplifies building and managing multiarch images by allowing simultaneous builds for multiple target platforms
• C. Buildx stores build cache in a remote registry
• D. Buildx automatically signs images

Answer: (B)

The main idea is that Buildx lets you build for multiple architectures in one go, using simultaneous builds for different target platforms. By leveraging BuildKit and the --platform option, you can create a single multi-arch image (for example linux/amd64 and linux/arm64) in a single command, often with parallel builds. This streamlines multi-platform workflows and makes CI/CD simpler, since one image can run on diverse environments without separate builds. Buildx can also use QEMU to build non-native architectures and manage builders and caches for efficient workflows. The other points don’t describe this core capability: image size isn’t inherently reduced by Buildx, cache storage and signing are optional/secondary aspects and not automatic defaults.

The main idea is that Buildx lets you build for multiple architectures in one go, using simultaneous builds for different target platforms. By leveraging BuildKit and the --platform option, you can create a single multi-arch image (for example linux/amd64 and linux/arm64) in a single command, often with parallel builds. This streamlines multi-platform workflows and makes CI/CD simpler, since one image can run on diverse environments without separate builds. Buildx can also use QEMU to build non-native architectures and manage builders and caches for efficient workflows. The other points don’t describe this core capability: image size isn’t inherently reduced by Buildx, cache storage and signing are optional/secondary aspects and not automatic defaults.