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  "description": "BuildKit is the modern build backend for Docker and the OCI ecosystem. It replaces the original Docker builder with a concurrent, cache-aware engine that builds OCI images from Dockerfiles much faster and with finer control.\n\n\nKey capabilities\n\n * Parallel build graph. Independent stages and instructions run concurrently rather than strictly top-to-bottom.\n * Granular caching. Layer caches keyed on instruction content; remote caches that can be pushed to and pulled from a registry.\n * Cache moun",
  "path": "/engineering-glossary/buildkit-docker-builder/",
  "publishedAt": "2026-05-12T18:40:35.000Z",
  "site": "https://sahilkapoor.com",
  "tags": [
    "Docker",
    "OCI",
    "Image Layer",
    "CI/CD"
  ],
  "textContent": "**BuildKit** is the modern build backend for Docker and the OCI ecosystem. It replaces the original Docker builder with a concurrent, cache-aware engine that builds OCI images from Dockerfiles much faster and with finer control.\n\n## Key capabilities\n\n  * **Parallel build graph.** Independent stages and instructions run concurrently rather than strictly top-to-bottom.\n  * **Granular caching.** Layer caches keyed on instruction content; remote caches that can be pushed to and pulled from a registry.\n  * **Cache mounts.** Per-step caches for package managers (pip, npm, apt, Go modules) that persist between builds without bloating image layers.\n  * **Secret and SSH mounts.** Inject secrets at build time without baking them into layers.\n  * **Multi-platform builds.** Build for amd64, arm64, and others from a single host via QEMU emulation.\n  * **Frontend pluggability.** Dockerfile is one frontend; others (Buildpacks, Nix-based) can target BuildKit.\n\n\n\n## How it is used\n\n  * **Docker.** BuildKit is the default builder for `docker build` on modern installations.\n  * **buildx.** Docker CLI plugin that exposes BuildKit's multi-platform and remote-cache features.\n  * **Standalone.** BuildKit can run as a remote build service for CI to share caches across runners.\n\n\n\n🔗\n\n**Related Terms**\nDocker, OCI, Image Layer, CI/CD.",
  "title": "BuildKit",
  "updatedAt": "2026-05-13T19:14:46.612Z"
}