Book Image

Learn Kubernetes Security

By : Kaizhe Huang, Pranjal Jumde
5 (1)
Book Image

Learn Kubernetes Security

5 (1)
By: Kaizhe Huang, Pranjal Jumde

Overview of this book

Kubernetes is an open source orchestration platform for managing containerized applications. Despite widespread adoption of the technology, DevOps engineers might be unaware of the pitfalls of containerized environments. With this comprehensive book, you'll learn how to use the different security integrations available on the Kubernetes platform to safeguard your deployments in a variety of scenarios. Learn Kubernetes Security starts by taking you through the Kubernetes architecture and the networking model. You'll then learn about the Kubernetes threat model and get to grips with securing clusters. Throughout the book, you'll cover various security aspects such as authentication, authorization, image scanning, and resource monitoring. As you advance, you'll learn about securing cluster components (the kube-apiserver, CoreDNS, and kubelet) and pods (hardening image, security context, and PodSecurityPolicy). With the help of hands-on examples, you'll also learn how to use open source tools such as Anchore, Prometheus, OPA, and Falco to protect your deployments. By the end of this Kubernetes book, you'll have gained a solid understanding of container security and be able to protect your clusters from cyberattacks and mitigate cybersecurity threats.
Table of Contents (19 chapters)
Section 1: Introduction to Kubernetes
Section 2: Securing Kubernetes Deployments and Clusters
Section 3: Learning from Mistakes and Pitfalls

Security boundaries in the network layer

A Kubernetes network policy defines the rules for different groups of Pods that are allowed to communicate with each other. In the previous chapter, we briefly talked about the egress rule of a Kubernetes network policy, which can be leveraged to enforce the principle of least privilege for microservices. In this section, we will go through a little more on the Kubernetes network policy and will focus on the ingress rule. We will show how the ingress rules of network policies can help to establish the trust boundaries among microservices.

Network policies

As mentioned in the previous chapter, as per the network model requirement, Pods inside a cluster can communicate with each other. But still, from a security perspective, you may want to restrict your microservice to being accessed by only a few services. How can we achieve that in Kubernetes? Let's take a quick look at the following Kubernetes network policy example: