CRI-O CRI gRPC API
CRI-O implements the Kubernetes Container Runtime Interface (CRI) gRPC API that the kubelet uses to manage pod sandboxes, containers, image lifecycle, and runtime status. The CRI gRPC API is served over a Unix domain socket (default /var/run/crio/crio.sock) and includes services for RuntimeService and ImageService as defined by the upstream CRI protobuf specification.