Using validationFailureActionOverrides, you can specify which actions to apply per Namespace. However, should a subsequent update to the violating resource(s) make them compliant, any further updates which would produce a violation are blocked. For preexisting resources which violate a newly-created policy set to enforce mode, Kyverno will allow subsequent updates to those resources which continue to violate the policy as a way to ensure no existing resources are impacted. When the value is set to audit, a policy violation is logged in a PolicyReport or ClusterPolicyReport but the resource creation or update is allowed. If the value is set to enforce, resource creation or updates are blocked when the resource does not comply. The validationFailureAction attribute controls admission control behaviors for resources that are not compliant with a policy. Kyverno permits creation of your new Namespace resource. Validation rule require-ns-purpose-label failed at path /metadata/labels/purpose/'Ĭhange the development value to production and try again. This is because it contains the label of purpose=production, which is the only pattern being validated in the rule.ĢError from server: error when creating "ns.yaml": admission webhook "" denied the request:ģ 4resource Namespace//prod-bus-app1 was blocked due to the following policiesħ require-ns-purpose-label: 'Validation error: You must have label `purpose` with value `production` set on all new namespaces. If a new Namespace with the following definition is submitted to Kyverno, given the ClusterPolicy above, it will be allowed (validated). 24 pattern : 25 metadata : 26 labels : 27 purpose : production In this case, it is looking for `metadata.labels` with `purpose=production`. 22 message : "You must have label `purpose` with value `production` set on all new namespaces." 23 # The `pattern` object defines what pattern will be checked in the resource. 20 validate : 21 # The `message` is what gets displayed to a user if this rule fails validation and is therefore blocked. ![]() If the statement, when compared with the requested resource, is true, it is allowed. 14 match : 15 any : 16 - resources : 17 kinds : 18 - Namespace 19 # The `validate` statement tries to positively check what is defined. In this case, it is any `Namespace` resource. 11 rules : 12 - name : require-ns-purpose-label 13 # The `match` statement sets the scope of what will be checked. 9 validationFailureAction : enforce 10 # The `rules` is one or more rules which must be true. 7 spec : 8 # The `validationFailureAction` tells Kyverno if the resource being validated should be allowed but reported (`audit`) or blocked (`enforce`). 3 kind : ClusterPolicy 4 metadata : 5 name : require-ns-purpose-label 6 # The `spec` defines properties of the policy. Basic ValidationsĪs a basic example, consider the below ClusterPolicy which validates that any new Namespace that is created has the label purpose with the value of production.ġ apiVersion : kyverno.io/v1 2 # The `ClusterPolicy` kind applies to the entire cluster. To deny certain API requests define a deny element in the validation rule along with a set of conditions that control when to allow or deny the request. ![]() To validate resource data, define a pattern in the validation rule. Resources in violation of an existing rule placed in audit mode will also surface in an event on the resource in question. Validation rules in audit mode can also be used to get a report on matching resources which violate the rule(s), both upon initial creation and when Kyverno initiates periodic scans of Kubernetes resources. It can either be blocked ( enforce) or noted in a policy report ( audit). The behavior of how Kyverno responds to a failed validation check is determined by the validationFailureAction field. If those properties are different, the creation is blocked. If those properties are validated, meaning there is agreement, the resource is allowed to be created. When a new resource is created by a user or process, the properties of that resource are checked by Kyverno against the validate rule. In a typical validation rule, one defines the mandatory properties with which a given resource should be created. ![]() Validation rules are probably the most common and practical types of rules you will be working with, and the main use case for admission controllers such as Kyverno. Check resource configurations for policy compliance.
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