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Table of Contents
Faster Builds Through Parallel Processing
Better Caching Mechanisms
Cleaner Output and Debugging Support
How to Enable and Use BuildKit
Home Operation and Maintenance Docker What is Docker BuildKit, and how does it improve build performance?

What is Docker BuildKit, and how does it improve build performance?

Jun 19, 2025 am 12:20 AM
docker BuildKit

Docker BuildKit is a modern image building backend. It can improve construction efficiency and maintainability by 1) parallel processing of independent construction steps, 2) more advanced caching mechanisms (such as remote cache reuse), and 3) structured output improves construction efficiency and maintainability, significantly optimizing the speed and flexibility of Docker image building. Users only need to enable the DOCKER_BUILDKIT environment variable or use the buildx command to activate this function.

Docker BuildKit is a modern, enhanced backend for building Docker images. It replaces the older builder with smarter and more efficient mechanisms under the hood. If you're building container images regularly, especially in CI/CD pipelines or complex projects, BuildKit can make a noticeable difference in both speed and flexibility.

Faster Builds Through Parallel Processing

One of the main ways BuildKit improves performance is by intelligently executing build steps in parallel when possible. Unlike the classic Docker builder, which runs each step strictly one after another, BuildKit analyzes the build graph and identifies independent stages that can be processed concurrently.

  • This means if your Dockerfile has multiple RUN commands that don't depend on each other, BuildKit can run them at the same time.
  • In multi-stage builds, it can also optimize how layers are built and reused across stages.

This kind of optimization is especially useful in large or modular projects where different parts of the image can be built independently.

Better Caching Mechanisms

BuildKit uses a more advanced caching system than the legacy builder. It doesn't just rely on layer hashes — it tracks content and usage more precisely.

  • Cache is versioned and can be exported/imported between buildings, making it ideal for CI environments.
  • With remote caching, you can reuse intermediate build results from previous jobs without rebuilding everything from scratch.

For example, if you're building an app where only the application code changes but the dependencies stay the same, BuildKit can reuse cached layers for installing packages, saving significant time.

Cleaner Output and Debugging Support

While not directly related to performance, BuildKit's structured output makes it easier to understand what's happening during a build. Instead of dumping logs in a messy way, it organizes them into clear sections per step.

  • You can enable a plain log view or switch to a more compact progress display.
  • This clarity helps spot bottlenecks or failed steps quickly, especially when optimizing build pipelines.

Additionally, because BuildKit supports LLB (Low-Level Builder) descriptions, it opens the door for tools and frontends beyond just Dockerfiles, like custom build definitions or integration with higher-level systems.

How to Enable and Use BuildKit

Using BuildKit is straightforward — you just need to opt in. It's available by default in Docker 18.09 and later.

To enable it globally, you can set:

 export DOCKER_BUILDKIT=1

Or for a single build:

 docker buildx build --progress=plain .

You can also configure it via the Docker daemon config file for consistent behavior across environments.


That's the core of what BuildKit brings to the table — smarter execution, better caching, and cleaner control. For most users, flipping the switch to use BuildKit is a low-effort, high-impact change. Not complicated, but definitely worth adopting.

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