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

Securing kubelet

kubelet is the node agent for Kubernetes. It manages the life cycle of objects within the Kubernetes cluster and ensures that the objects are in a healthy state on the node.

To secure kubelet, you should do the following:

  • Disable anonymous authentication: If anonymous authentication is enabled, requests that are rejected by other authentication methods are treated as anonymous. Ensure that --anonymous-auth=false is set for each instance of kubelet.
  • Set the authorization mode: The authorization mode for kubelet is set using config files. A config file is specified using the --config parameter. Ensure that the authorization mode does not have AlwaysAllow in the list.
  • Rotate kubelet certificates: kubelet certificates can be rotated using a RotateCertificates configuration in the kubelet configuration file. This should be used in conjunction with RotateKubeletServerCertificate to auto-request rotation of server certificates.
  • Provide a Certificate...