kjaksik / podpreset-crd

CRD implementation of podpresets, scaffolded from kubebuilder

PodPresets CRD

The source in the repository contains a PodPreset resource that's implemented via a CRD that is paired with a mutating webhook in order to modify pod specs on the fly.

Getting started

In order to deploy the PodPreset resource into your cluster, do the following:

1. Deploy Kubernetes.

2. Install kustomize.

3. Run CRD, choose to execute inside or outside the cluster.

   Inside cluster:

   make docker-build
   make deploy

   Outside cluster (for debugging/development):

   make install
   make run

4. Build the webhook container image.

   make build-webhook
   make build-image-webhook

5. Install the webhook.

   make deploy-webhook

6. Apply desired pod presets as needed, example given below.

Build process

Docker images for controller and webhook server are automatically created on every commit and PR:

• eu.gcr.io/kyma-project/incubator/pr/podpreset-controller:PR-X
• eu.gcr.io/kyma-project/incubator/pr/podpreset-webhook:PR-X

Example usage

kubectl create -f config/samples/apod-preset.yaml
kubectl create -f config/samples/apod.yaml

History

PodPresets has had a long history in various forms throughout its alpha life (it's still alpha). As of August 2018, the PodPreset resource still exists in the Kubernetes core, but is planned to be superceded by the code here.

Additional information

Certificates

The Makefile utilizes pre-generated certificates for use with the mutating webhook. An example script that generates new certificates is located in webhook/pki/gen-certs.sh. The cabundle patch file needs to be adjusted accordingly afterwards, unless the deployment file is used directly.

Service Catalog integration

This repository is only one piece required for full integration with Service Catalog. Also review the podpresetbinding-crd repository for functionality that auto-generates pod presets upon service bindings being ready.