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 system layer

Microservices run inside Pods, where Pods are scheduled to run on worker nodes in a cluster. In the previous chapters, we already emphasized that a container is a process assigned with dedicated Linux namespaces. A container or Pod consumes all the necessary resources provided from the worker node. So, it is important to understand the security boundaries from the system's perspective and how to fortify it. In this section, we will talk about the security boundaries built upon Linux namespaces and Linux capabilities together for microservices.

Linux namespaces as security boundaries

Linux namespaces are a feature of the Linux kernel to partition resources for isolation purposes. With namespaces assigned, a set of processes sees one set of resources while another set of processes sees another set of resources. We've already introduced Linux namespaces in Chapter 2, Kubernetes Networking. By default, each Pod has its own network...