Earlier kubernetes used docker as its container runtime. Now kubernetes is not interested in docker. Why?
Docker provides tools for building, managing, and running containers. It includes features like Docker Engine, which acts as a runtime for containers, Docker CLI for managing containers, and Docker Compose for defining multi-container applications.
Containerd, on the other hand, is a core container runtime designed to handle container execution & supervision. It's lighter, more focused leaving other tasks to higher-level tools.
Kubernetes earlier worked with Docker as its default container runtime. However, Kubernetes now supports Containerd directly, eliminating the need for Docker as an intermediate layer.
Kubernetes moved away from Docker due to several reasons, including the desire for a more modular architecture, improved stability & broader compatibility with diff container runtimes. Containerd emerged as a lightweight/reliable & well aligned with Kubernetes' goals.
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