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 kube-controller-manager

kube-controller-manager manages the control loop for the cluster. It monitors the cluster for changes through the API server and aims to move the cluster from the current state to the desired state. Multiple controller managers are shipped by default with kube-controller-manager, such as a replication controller and a namespace controller. Compromise of kube-controller-manager can result in updates to the cluster being rejected.

To secure kube-controller-manager, you should use --use-service-account-credentials which, when used with RBAC ensures that control loops run with minimum privileges.

On Minikube, the kube-controller-manager configuration looks like this:

$ps aux | grep kube-controller-manager
root      3927  1.8  4.5 209520 90072 ?        Ssl  01:03   0:11 kube-controller-manager --authentication-kubeconfig=/etc/kubernetes...