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

Introducing the CNI and CNI plugins

In Kubernetes, CNI stands for the Container Network Interface. CNI is a Cloud Native Computing Foundation (CNCF) project—you can find further information on GitHub here: Basically, there are three things in this project: a specification, libraries for writing plugins to configure network interfaces in Linux containers, and some supported plugins. When people talk about the CNI, they usually make reference to either the specification or the CNI plugins. The relationship between the CNI and CNI plugins is that the CNI plugins are executable binaries that implement the CNI specification. Now, let's look into the CNI specification and plugins at a high level, and then we will give a brief introduction to one of the CNI plugins, Calico.

CNI specification and plugins

The CNI specification is only concerned with the network connectivity of containers and removing allocated resources when the...