The dark side of Kubernetes admission webhooks
Admission webhooks are widely used in the Kubernetes world, but people often don’t know how easily a faulty webhook can cause unwanted outages or even worse: bring down entire clusters.
In this post, we’ll explore the potential issues caused by webhooks and how you can avoid them.
Admission webhooks Before talking about webhooks, we need to mention admission controllers.
Admission controllers are “pieces of code that intercept requests to the Kubernetes API server prior to persistence of the object”, acting as middleware in processing objects.