BuildKit: A Modern Builder Toolkit on Top of containerd
summary
BuildKit moves image building out of Docker Engine into a containerd-based toolkit that runs as a daemon or in Kubernetes, claims up to 2x faster Dockerfile builds and shows an extreme case from 139s → 31s to 3.29s using cache mounts. It supports multi-platform images with one Dockerfile (buildx produces manifest lists across amd64/arm64), offers remote caching for CI (cold build 2m50s vs cached 36s), rootless operation, and secrets/ssh mounts that avoid leaking credentials.
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chapters (22)
- 0:00Intro
- 0:17What is Build Kit?
- 1:01What's the issue with old builder?
- 2:23BuildKit solves these problems
- 3:13Built on containerd
- 3:48Embraces OCI standards
- 4:32Problems of legacy docker build
- 6:18BuildKit LLB
- 8:59Extensible syntax
- 9:24RUN --mount=type=cache
- 10:39RUN --mount=type=secret
- 12:56Many ways to use BuildKit
- 14:35Docker Buildx
- 16:16Buildx: Full BuildKit
- 21:53Buildx: Multi-platform images
- 22:58Why build images on Kube?
- 24:13Legacy docker build on Kubernetes
- 24:56Rootless mode
- 25:58Rootless BuildKit vs Kaniko
- 26:48Deployment strategy
- 27:56Caching
- 30:24Recap
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