![]() ![]() It is meant to be used as a validating and mutating admission webhook only and does not support any controller logic. It has been developed as a simple Go web service without using any framework or boilerplate such as kubebuilder. This project is aimed at illustrating how to build a fully functioning admission webhook in the simplest way possible. Most existing examples found on the web rely on heavy machinery using powerful frameworks, yet fail to illustrate how to implement a lightweight webhook that can do much needed actions such as rejecting a pod for compliance reasons, or inject helpful environment variables.įor readability, this project has been stripped of the usual production items such as: observability instrumentation, release scripts, redundant deployment configurations, etc. As such, it is not meant to use as-is in a production environment. This project is, in fact, a simplified fork of a system used accross all Kubernetes production environments at Slack. Requirementsįirst, we need to create a Kubernetes cluster: This project can fully run locally and includes automation to deploy a local Kubernetes cluster (using Kind). ? Building simple-kubernetes-webhook Docker image.ĭocker build -t simple-kubernetes-webhook:latest. Service/simple-kubernetes-webhook created ? Deploying simple-kubernetes-webhook.ĭeployment.apps/simple-kubernetes-webhook created Kubectl apply -f dev/manifests/cluster-config/ Kind load docker-image simple-kubernetes-webhook:latest ? Pushing admission-webhook image into Kind's Docker daemon. Then, make sure the admission webhook pod is running (in the default namespace): Secret/simple-kubernetes-webhook-tls created Ok /slackhq/simple-kubernetes-webhook/pkg/admissionĐ.611s Slack apps can be built just for your own workspace or distributed through the App Directory, and they can use the latest and greatest APIs and UI features. Ok /slackhq/simple-kubernetes-webhook/pkg/mutationđ.064s Outgoing Webhooks Outgoing Webhooks are a legacy method of sending notifications to an app about two specific activities: A message was posted in a particular public Slack channel. Ok /slackhq/simple-kubernetes-webhook/pkg/validationĐ.749sĪ set of validations and mutations are implemented in an extensible framework. ![]() Those happen on the fly when a pod is deployed and no further resources are tracked and updated (ie. name validation: validates that a pod name doesn't contain any offensive string.To add a new pod mutation, create a file pkg/validation/MUTATION_NAME.go, then create a new struct implementing the validation.podValidator interface. inject env: inject environment variables into the pod such as KUBE: true.minimum pod lifespan: inject a set of tolerations used to match pods to nodes of a certain age, the tolerations injected are controlled via the /lifespan-requested pod label. ![]()
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