Chapter 2: Kubernetes Networking

When thousands of microservices are running in a Kubernetes cluster, you may be curious about how these microservices communicate with each other as well as with the internet. In this chapter, we will unveil all the communication paths in a Kubernetes cluster. We want you to not only know how the communication happens but to also look into the technical details with a security mindset: a regular communication channel can always be abused as part of the kill chain.

In this chapter, we will cover the following topics:

• Overview of the Kubernetes network model
• Communicating inside a pod
• Communicating between pods
• Introducing the Kubernetes service
• Introducing the CNI and CNI plugins