I am also getting this issue when installing a custom Istio helm chart:

[tiller] 2019/11/15 21:50:52 failed install perform step: release test failed: the server could not find the requested resource (post gatewaies.networking.istio.io)

I've confirmed the Istio CRDs are installed properly. Note how the installed Gateway CRD explicitly notes the accepted plural name:

status:
  acceptedNames:
    categories:
    - istio-io
    - networking-istio-io
    kind: Gateway
    listKind: GatewayList
    plural: gateways
    shortNames:
    - gw
    singular: gateway

I created an issue on Helm to see if that is the culprit, otherwise, I can open an issue on Istio to see if that is either. I'm very confused where the source of this issue could be coming from.

**Note: ** The type of the Gateway resource is correct:

apiVersion: networking.istio.io/v1alpha3
kind: Gateway

You are missing the CustomResourceDefinition required by istio and hence getting this error. You need to apply following command from istio folder:

kubectl apply -f install/kubernetes/helm/istio/templates/crds.yaml

This will create all the CRD's like virtualservice, destinationrules etc.

Try following official documentation of Istio to install it on GKE:

https://istio.io/docs/setup/kubernetes/quick-start-gke-dm/

istio works by defining a series of crds(Custom Resource Definition), for istio to work, you first need to run command like this:

kubectl apply -f install/kubernetes/helm/istio/templates/crds.yaml

for my version(istio v1.2.0), the command is

for i in install/kubernetes/helm/istio-init/files/crd*yaml; do kubectl apply -f $i; done

but as I follow the instructions from the documentatino, I still get the annoying messages:

Error from server (NotFound): error when creating "samples/bookinfo/networking/bookinfo-gateway.yaml": the server could not find the requested resource (post gatewaies.networking.istio.io)

as the hint implies, the requested resource "gatewaies.networking.istio.io" cannot be found, and then I list the crds:

kubectl get crd

and I got a list like this: enter image description here

as I see inspect this, I find something wrong. the message issued by kubectl is (post gatewaies.networking.istio.io), but the crd enlisted is post gateways.networking.istio.io, then everything is clear, the kubectl CLI issued a wrong plural for word "gateway", the correct form is gateways, instead of gatewaies, so to satisfy the command form, the crd must change. And I edit this file:

vim install/kubernetes/helm/istio-init/files/crd-10.yaml

by changing the name from "gateways.networking.istio.io" to "gatewaies.networking.istio.io", everything is ok now.