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Ingress 20 errors

Kubernetes Ingress Errors

404 default backend, missing TLS secrets, IngressClass and path matching.

Understanding Ingress errors

An Ingress failure is a routing failure, and there are only a few places it can break: the IngressClass is missing so no controller claims the resource, the path or host does not match, the backing Service has no endpoints, or the TLS secret is absent or in the wrong namespace. The "default backend - 404" page is the controller saying it received the request but found no rule for it.

How to debug Ingress errors

  1. Work backwards from the pod: kubectl get endpoints <service>. If it is empty, the Service selector does not match any ready pod and no Ingress configuration will help.
  2. Check that a controller has claimed the Ingress: kubectl describe ingress <name> should show events and an assigned address. No address means no controller is watching that IngressClass.
  3. Read the controller's own logs (kubectl logs -n ingress-nginx deploy/ingress-nginx-controller). They log rejected configuration and certificate problems explicitly.
  4. Remember TLS secrets must live in the same namespace as the Ingress. This is the single most common TLS mistake.
  5. Verify path type semantics: Prefix, Exact and ImplementationSpecific match differently, and regex behaviour varies between controllers.

Tools worth reaching for

  • kubectl describe ingress
  • kubectl get endpoints
  • controller logs
  • curl -H 'Host: …'
  • openssl s_client -servername

All 20 Ingress errors

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