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KubeConfig Generator

This is a small go program that I use for testing the creation of new users for multi-tenant kubernetes applications.

This program takes in a small configuration yaml (defined in the new-user-template.yaml) as the primary argument and does the following:

  • creates new roles
  • creates new clusterroles
  • creates new rolebindings
  • creates new clusterrolebindings
  • generates a kubeconfig for the user

You still need to generate your own x509 certs signed with the client-ca.crt and client-ca.key from the kubernetes server.

generating these keys is pretty straightforward with the openssl application:

# Generate a new client key
openssl genrsa -out client.key 2048

# Create a CSR - make sure to set the CN to the user you are setting up
openssl req -new -key client.key -out client.csr -subj "/CN=example-user"

# sign the CSR 
openssl x509 -req -in client.csr -CA client-ca.crt -CAkey client-ca.key -CAcreateserial -out client.crt -days 365 -sha256

Then simply put the client.crt and client.key in the yaml config

Building

you can build it locally with go build cmd/kcgen/kecgen.go or via the provided Dockerfile for a more consistent deployment.

# podman is the same command just s/docker/podman/g

docker build -t kcgen .
docker run --rm -v new-user-template.yaml:/app/new-user-template.yaml kcgen /app/my_template.yaml