Kubernetes concepts

In this section, we’ll briefly introduce many important Kubernetes concepts and give you some context as to why they are needed and how they interact with each other. The goal is to get familiar with these terms and concepts. Later, we will see how these concepts are woven together and organized into API groups and resource categories to achieve awesomeness. You can consider many of these concepts as building blocks. Some concepts, such as nodes and the control plane, are implemented as a set of Kubernetes components. These components are at a different abstraction level, and we will discuss them in detail in a dedicated section, Kubernetes components.

Here is the Kubernetes architecture diagram:

Figure 1.1: Kubernetes architecture

Node

A node is a single host. It may be a physical or virtual machine. Its job is to run pods. Each Kubernetes node runs several Kubernetes components, such as the kubelet, the container runtime, and the kube...