Kubernetes clusters are run on actual bare-metal clusters and interact with the infrastructure systems running on the servers. Extension points for infrastructure are still in the design stage and not mature enough for standardization. However, they can be grouped as follows:
- Server: The Kubernetes node components interact with container runtimes such as Docker. Currently, Kubernetes is designed to work with any container runtime that implements the Container Runtime Interface (CRI) specification. CRI consists of libraries, protocol buffers, and the gRPC API to define the interaction between Kubernetes and the container environment.
- Network: Kubernetes and the container architecture requires high-performance networking, decoupled from container runtime. The connections between containers and network interfaces are defined with the abstraction...