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)
1
Section 1: Introduction to Kubernetes
7
Section 2: Securing Kubernetes Deployments and Clusters
14
Section 3: Learning from Mistakes and Pitfalls

Securing kube-scheduler

Next, we look at kube-scheduler. As we have already discussed in Chapter 1, Kubernetes Architecture, kube-scheduler is responsible for assigning a node to a pod. Once the pod is assigned to a node, the kubelet executes the pod. kube-scheduler first filters the set of nodes on which the pod can run, then, based on the scoring of each node, it assigns the pod to the filtered node with the highest score. Compromise of the kube-scheduler component impacts the performance and availability of the pods in the cluster.

To secure kube-scheduler, you should do the following:

  • Disable profiling: Profiling of kube-scheduler exposes system details. Setting --profiling to false reduces the attack surface.
  • Disable external connections to kube-scheduler: External connections should be disabled for kube-scheduler. AllowExtTrafficLocalEndpoints is set to true, enabling external connections to kube-scheduler. Ensure that this feature is disabled using --feature...