Kyverno, a policy engine for Kubernetes, is increasingly becoming the defacto standard for how to apply policy in a Kubernetes environment as a result of it being specifically designed for Kubernetes. Since it does not require either policy authors or policy readers to learn any programming language, it's a perfect fit …

Resource mutation is a valuable ability and can be used to solve many different use cases, some of which I covered in the past here and here. The thing most mutations have in common, however, is that there needs to be some event to occur which triggers the mutation. This event is most commonly an AdmissionReview …

In real life, imposed rules often have cases where exceptions may be required but on a case-by-case basis. Policy is really no different here. While prevention of objectively "bad" behavior should be commonplace and enforced as widely as possible, there are valid situations where the rule may need to be bent …

Policy Exceptions are a new feature introduced in Kyverno 1.9 which allow decoupled, self-service, and granular exclusion of resources to one or more Kyverno policies. Because they effectively allow bypassing a policy, great care should be taken when employing them. In this post, I'll show how you can use another …

It seems just about everyone is doing GitOps in Kubernetes these days. With so many available tools and the maturity of them, it's hard to avoid it. But with only one tool being responsible for the actual creation in the cluster of the resources stored in git, it makes it difficult or impossible for someone to answer …

(This post first appeared on nirmata.com) One of the great new features in the recently-released Kyverno 1.9 is something we introduced called Policy Exceptions which decouples the policy itself from the workloads to which it applies. But what if you only want to enable policy exceptions for a brief period of time? …

There was an interesting poll I happened to stumble across on Twitter the other day from Ahmet Alp Balkan, a former staff software engineer and tech lead at Twitter's Kubernetes-based compute infrastructure team. Although I don't know Ahmet personally, I know him through his work on the popular (and terrific) krew as …

KubeCon 2022 North America, the largest Kubernetes-centric conference, just wrapped up in Detroit, Michigan at the end of October of this year. I had the good fortune of attending for another year but this time in a role fully dedicated to the Kyverno project for which I serve as one of the maintainers. These are some …

(This post first appeared on nirmata.com) Policy is commonly thought of as being primarily (if not solely) useful in the area of security, blocking the "bad" while allowing the "good". This misconception is understandable because many tools which operate by implementing "policy" are often …

(Last Updated August 2022) The subject of vulnerabilities in container images is a serious business. As an image author yourself, one of the things you should be doing is ensuring you know what those vulnerabilities are and that you aren't relying on what a scan told you three months ago to make decisions about running …