Kyverno - Kubernetes Native Policy Management
Kyverno is a policy engine built for Kubernetes:
- policies as Kubernetes resources (no new language to learn!)
- validate, mutate, or generate any resource
- match resources using label selectors and wildcards
- validate and mutate using overlays (like Kustomize!)
- generate and synchronize defaults across namespaces
- block or report violations
- test using kubectl
NOTE : Your Kubernetes cluster version must be above v1.14 which adds webhook timeouts.
To check the version, enter
kubectl create -f https://raw.githubusercontent.com/nirmata/kyverno/master/definitions/release/install.yaml
You can also install Kyverno using a Helm chart.
Add the policy below. It contains a single validation rule that requires that all pods have
app.kubernetes.io/name label. Kyverno supports different rule types to validate,
mutate, and generate configurations. The policy attribute
validationFailureAction is set
enforce to block API requests that are non-compliant (using the default value
will report violations but not block requests.)
apiVersion: kyverno.io/v1 kind: ClusterPolicy metadata: name: require-labels spec: validationFailureAction: enforce rules: - name: check-for-labels match: resources: kinds: - Pod validate: message: "label `app.kubernetes.io/name` is required" pattern: metadata: labels: app.kubernetes.io/name: "?*"
Try creating a deployment without the required label:
kubectl create deployment nginx --image=nginx
You should see an error:
Error from server: admission webhook "nirmata.kyverno.resource.validating-webhook" denied the request: resource Deployment/default/nginx was blocked due to the following policies require-labels: autogen-check-for-labels: 'Validation error: label `app.kubernetes.io/name` is required; Validation rule autogen-check-for-labels failed at path /spec/template/metadata/labels/app.kubernetes.io/name/'
Create a pod with the required label. For example from this YAML:
kind: "Pod" apiVersion: "v1" metadata: name: nginx labels: app.kubernetes.io/name: nginx spec: containers: - name: "nginx" image: "nginx:latest"
This pod configuration complies with the policy rules, and is not blocked.
Clean up by deleting all cluster policies:
kubectl delete cpol --all
- Getting Started
- Writing Policies
- Testing Policies
- Policy Violations
- Kyverno CLI
- Sample Policies
- API Documentation
- For feature requests and bugs, file an issue.
- For discussions or questions, join the #kyverno channel on the Kubernetes Slack or the mailing list.
Thanks for your interest in contributing!
- Please review and agree to abide with the Code of Conduct before contributing.
- We encourage all contributions and encourage you to read our contribution guidelines.
- See the Wiki for developer documentation.
- Browse through the open issues
Presentations and Articles
- Introducing Kyverno - blog post
- CNCF Video and Slides
- 10 Kubernetes Best Practices - blog post
- VMware Code Meetup Video
- Virtual Rejekts Video
- TGIK Video
Open Policy Agent
Open Policy Agent (OPA) is a general-purpose policy engine that can be used as a Kubernetes admission controller. It supports a large set of use cases. Policies are written using Rego a custom query language.
Polaris validates configurations for best practices. It includes several checks across health, networking, security, etc. Checks can be assigned a severity. A dashboard reports the overall score.
External configuration management tools
Tools like Kustomize can be used to manage variations in configurations outside of clusters. There are several advantages to this approach when used to produce variations of the same base configuration. However, such solutions cannot be used to validate or enforce configurations.
Cleans up stale webhookconfigurations created by kyverno that were not cleanedup
|Cleans up stale webhookconfigurations created by kyverno that were not cleanedup|
This package has the automatically generated clientset.
|This package has the automatically generated clientset.|
This package has the automatically generated fake clientset.
|This package has the automatically generated fake clientset.|
This package contains the scheme of the automatically generated clientset.
|This package contains the scheme of the automatically generated clientset.|
This package has the automatically generated typed clients.
|This package has the automatically generated typed clients.|
Package fake has the automatically generated clients.
|Package fake has the automatically generated clients.|