Fundamental Kubernetes Resources

Kubernetes creates a powerful abstraction to provide life cycle management of scalable and robust cloud-native applications. Master and node components, as discussed in the previous chapters, work continuously to fulfill the desired state of workloads defined by the users using the Kubernetes API and client tools. In this section, different Kubernetes concepts and resources are explained with their essentials and real-life practices.

The Pod

The pod is the building block of Kubernetes computation objects. A pod consists of containers that are tightly coupled and should be treated as a single application. These containers in the same pod are always scheduled on the same node since they share volume and networking interfaces. Therefore, the pod can be imagined as an encapsulated set of containers that should work together and share the same life cycle, such as scaling up or down together.

Pods can be defined with just one container and its associated...