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报错:

 rancher-rke-01:~/rke/rancher-helm/rancher # helm install rancher rancher-stable/rancher   --namespace cattle-system   --set hostname=www.rancher.local
Error: INSTALLATION FAILED: Internal error occurred: failed calling webhook "webhook.cert-manager.io": failed to call webhook: Post "https://cert-manager-webhook.cert-manager.svc:443/mutate?timeout=10s": context deadline exceeded

解决办法:

cert-manager 🚀 - 发生内部错误:调用webhook“ webhook.cert-manager.io”失败:发布https://cert-manager-webhook.cert-manager.svc:443 / mutate?timeout = 30s:net / http:TLS握手超时 | bleepcoder.com

$ helm install \
  cert-manager jetstack/cert-manager \
  --namespace cert-manager \
  --version v0.16.0 \
  --set installCRDs=true

$ kubectl delete mutatingwebhookconfiguration.admissionregistration.k8s.io cert-manager-webhook
$ kubectl delete validatingwebhookconfigurations.admissionregistration.k8s.io cert-manager-webhook

这里有思考:
Kubeflow installation: "Internal error occurred: failed calling webhook "webhook.cert-manager.io"" · Issue #4806 · kubeflow/kubeflow · GitHub