Kubernetes is designed to support modular cloud-native applications from the ground up, so it is not surprising to find the platform to be equally modular and flexible. Kubernetes incorporates plugins, add-ons, services, and interfaces to extend the core functionalities of the platform. Kube’s integral configuration is how you can make changes and customize your environment, but customization goes beyond changing flags and local configuration files.
Extensions are defined as components that integrate seamlessly with the rest of the environment, offering native-like features and extending the commands available to cluster administrators. Extensions can also be used to add support for custom (and new) hardware.