ContainerD/CRI-O
ContainerD:
ContainerD is an industry standard container runtime with emphasis on simplicity, robustness and portability
This includes Docker's functionality for executing containers, low-level storage & managing image transfers.
ContainerD makes it easier for projects like K8s to access the low-level "Docker" elements they need
Images built with Docker aren't really "Docker image"
Images are built in the standardized OCI format.
CRI-O
Alternative to using Docker
It supports runc & kata containers as container runtimes
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