kubernetes admission_error ai_generated true

Error from server: admission webhook denied the request

ID: kubernetes/k8s-admission-webhook-denied

Also available as: JSON · Markdown
85%Fix Rate
88%Confidence
65Evidence
2023-06-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
8 active — — —

Root Cause

A validating or mutating admission webhook rejected the API request. The resource does not comply with the webhook's policy.

generic

Workarounds

  1. 90% success Read the denial message to understand which policy was violated and fix the resource spec 
    kubectl apply -f resource.yaml 2>&1 | grep 'denied the request' — the message usually explains exactly what's wrong

    Sources: https://kubernetes.io/docs/reference/access-authn-authz/extensible-admission-controllers/

  2. 85% success Check which webhooks are configured and their rules: kubectl get validatingwebhookconfigurations,mutatingwebhookconfigurations 
    kubectl get validatingwebhookconfigurations -o yaml to see rules and namespaceSelector

    Sources: https://kubernetes.io/docs/reference/access-authn-authz/extensible-admission-controllers/

Dead Ends

Common approaches that don't work:

  1. Delete the webhook configuration to bypass validation 75% fail

    Removes security policies — the webhook exists for a reason and may be required by compliance

  2. Retry the same request hoping it will pass 95% fail

    Admission webhooks are deterministic — same input yields same denial

Error Chain

Leads to:
Preceded by:
Frequently confused with: