failed to call webhook: Post "..": tls: failed to verify certificate: x509: certificate signed by unknown authority

[cloud-66]

Describe the bug

I Can't create cluster with error

 kubectl apply -f .\rabbit1.yaml
Error from server (InternalError): error when creating ".\\rabbit1.yaml": Internal error occurred: failed calling webhook "mrabbitmqcluster-v1beta1.kb.io": failed to call webhook: Post "https://cluster-operator-webhook-service.rabbitmq-system.svc:443/mutate-rabbitmq-com-v1beta1-rabbitmqcluster?timeout=10s": tls: failed to verify certificate: x509: certificate signed by unknown authority

To Reproduce

Steps to reproduce the behavior:

1. install operator
   kubectl apply -f "https://github.com/rabbitmq/cluster-operator/releases/latest/download/cluster-operator.yml"

>  kubectl apply -f .\cluster-operator.yml
namespace/rabbitmq-system unchanged
customresourcedefinition.apiextensions.k8s.io/rabbitmqclusters.rabbitmq.com unchanged
serviceaccount/rabbitmq-cluster-operator unchanged
role.rbac.authorization.k8s.io/rabbitmq-cluster-leader-election-role unchanged
clusterrole.rbac.authorization.k8s.io/rabbitmq-cluster-operator-role unchanged
clusterrole.rbac.authorization.k8s.io/rabbitmq-cluster-service-binding-role unchanged
rolebinding.rbac.authorization.k8s.io/rabbitmq-cluster-leader-election-rolebinding unchanged
clusterrolebinding.rbac.authorization.k8s.io/rabbitmq-cluster-operator-rolebinding unchanged
service/cluster-operator-webhook-service unchanged
service/rabbitmq-cluster-operator-metrics-service unchanged
deployment.apps/rabbitmq-cluster-operator unchanged
certificate.cert-manager.io/cluster-operator-serving-cert configured
certificate.cert-manager.io/metrics-certs configured
issuer.cert-manager.io/selfsigned-issuer unchanged
mutatingwebhookconfiguration.admissionregistration.k8s.io/cluster-operator-mutating-webhook-configuration configured
validatingwebhookconfiguration.admissionregistration.k8s.io/cluster-operator-validating-webhook-configuration configured

2. Create cluster
   kubectl apply -f .\rabbit1.yaml

apiVersion: rabbitmq.com/v1beta1
kind: RabbitmqCluster
metadata:
  name: qdrcbrdev2
spec:
  persistence:
    storageClassName: local-storage-class
    storage: 10Gi
  tolerations:
  - effect: NoExecute
    key: dedicated.deckhouse.io
    operator: Equal
    value: system

3. See error

Error from server (InternalError): error when creating ".\\rabbit1.yaml": Internal error occurred: failed calling webhook "mrabbitmqcluster-v1beta1.kb.io": failed to call webhook: Post "https://cluster-operator-webhook-service.rabbitmq-system.svc:443/mutate-rabbitmq-com-v1beta1-rabbitmqcluster?timeout=10s": tls: failed to verify certificate: x509: certificate signed by unknown authority

Expected behavior
I have cert-manager installer and certificate created .

Version and environment information

• RabbitMQ Cluster Operator: ghcr.io/rabbitmq/cluster-operator:2.22.5
• Kubernetes: v1.33.10

[MirahImage]

This is almost certainly some sort of TLS misconfiguration on your end. All of our tests rely on this functioning correctly, and I have explicitly manually verified that the webhook is configured correctly and instances successfully deploy.

We do not provide community support for TLS configuration, but with a correctly deployed cert-manager, everything should function as expected.