Shell scripts for help automating RBAC setup on test Kubernetes clusters

The primary purpose is to create:

• a service account
• a namespace
• RBAC rules that restrict the service account to only read/write to that namespace
• RBAC rules that let the service account read Node information
• a kubeconfig for the service account

$ ./create-restricted-namespace.sh [namespace]

Creates a kubeconfig with a token for authentication. Instructions on how to use the kubeconfig will be printed to stdout.

Real, production auth systems use short-lived tokens that need to be refreshed periodically (e.g., aws-iam-authenticator). If you'd like to simulate that flow, use the -e option to create a fake auth script with rotate-able tokens.

$ ./create-restricted-namespace.sh -e [namespace]

Instructions on how to rotate the token will be printed to stdout.

Verified working on

• Minikube
• KIND (Kubernetes IN Docker)
• Docker For Desktop (Docker for Mac)
• microk8s - with Microk8s 1.15+, when you run microk8s.enable rbac

Won't work with:

• kubeadm-dind-cluster - Configured to use the insecure API endpoint by default

Thanks to:

• The Kubernetes RBAC documentation
• Kubernetes and RBAC: Restrict User Access to One Namespace by Jeremie Vallee
• Debugging help from Guillaume Rose

Copyright 2019 Windmill Engineering

Licensed under the Apache License, Version 2.0