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.
Key capabilities
The Open Container Initiative (OCI) is an open governance body, hosted by the Linux Foundation, that maintains the standard specifications for container images, runtimes, and distribution. OCI specs are why a container built with one tool runs on another, and why Docker, Podman, Kubernetes, and cloud platforms can interoperate.
The three specs
containerd is an industry-standard container runtime daemon that manages the complete container lifecycle on a host: image pull and storage, container execution, snapshotting, and networking. It is the runtime that Kubernetes, Docker, and most container platforms call underneath.
How it fits
Container tooling is typically layered. Docker and Kubernetes are high-level interfaces; they delegate…