Let's encrypt docs are out of date and lead to errors

[trentmillar]

Describe the bug https://azure.github.io/application-gateway-kubernetes-ingress/how-tos/lets-encrypt/

A clear and concise description of what the bug is.

The very first step, kubectl apply -f https://raw.githubusercontent.com/jetstack/cert-manager/release-0.13/deploy/manifests/00-crds.yaml --validate=false

Results in this on my AKS cluster,

resource mapping not found for name: "certificaterequests.cert-manager.io" namespace: "" from "https://raw.githubusercontent.com/jetstack/cert-manager/release-0.13/deploy/manifests/00-crds.yaml": no matches for kind "CustomResourceDefinition" in version "apiextensions.k8s.io/v1beta1"
ensure CRDs are installed first
resource mapping not found for name: "certificates.cert-manager.io" namespace: "" from "https://raw.githubusercontent.com/jetstack/cert-manager/release-0.13/deploy/manifests/00-crds.yaml": no matches for kind "CustomResourceDefinition" in version "apiextensions.k8s.io/v1beta1"
ensure CRDs are installed first
resource mapping not found for name: "challenges.acme.cert-manager.io" namespace: "" from "https://raw.githubusercontent.com/jetstack/cert-manager/release-0.13/deploy/manifests/00-crds.yaml": no matches for kind "CustomResourceDefinition" in version "apiextensions.k8s.io/v1beta1"
ensure CRDs are installed first
resource mapping not found for name: "clusterissuers.cert-manager.io" namespace: "" from "https://raw.githubusercontent.com/jetstack/cert-manager/release-0.13/deploy/manifests/00-crds.yaml": no matches for kind "CustomResourceDefinition" in version "apiextensions.k8s.io/v1beta1"
ensure CRDs are installed first
resource mapping not found for name: "issuers.cert-manager.io" namespace: "" from "https://raw.githubusercontent.com/jetstack/cert-manager/release-0.13/deploy/manifests/00-crds.yaml": no matches for kind "CustomResourceDefinition" in version "apiextensions.k8s.io/v1beta1"
ensure CRDs are installed first
resource mapping not found for name: "orders.acme.cert-manager.io" namespace: "" from "https://raw.githubusercontent.com/jetstack/cert-manager/release-0.13/deploy/manifests/00-crds.yaml": no matches for kind "CustomResourceDefinition" in version "apiextensions.k8s.io/v1beta1"
ensure CRDs are installed first

To Reproduce Steps to reproduce the behavior:

Ingress Controller details

• Output of kubectl describe pod <ingress controller> . The pod name can be obtained by running helm list.
• Output of `kubectl logs .
• Any Azure support tickets associated with this issue.

[chuongnguyen5397]

I'm facing the same issue. Any update yet? I'm bypassing this one by editting the content manually