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Use Istio as ingress controller for knative on minikube cluster

Start a cluster:

minikube start --driver=virtualbox

Install knative custom resource definitions and core components:

kubectl apply --filename https://github.com/knative/serving/releases/download/v0.17.0/serving-crds.yaml
kubectl apply --filename https://github.com/knative/serving/releases/download/v0.17.0/serving-core.yaml

Install Istio for knative as described here (make sure you have istioctl installed):

istioctl install -f istio-minimal-operator.yaml
kubectl apply --filename https://github.com/knative/net-istio/releases/download/v0.17.0/release.yaml

Extract service ports:

kubectl --namespace istio-system get service istio-ingressgateway
NAME                   TYPE           CLUSTER-IP      EXTERNAL-IP   PORT(S)                                                      AGE
istio-ingressgateway   LoadBalancer   10.106.178.24   <pending>     15021:30779/TCP,80:32317/TCP,443:30794/TCP,15443:31847/TCP   2m42s

export PROXY_PORT_HTTP=$(kubectl -n istio-system get service istio-ingressgateway -o jsonpath='{.spec.ports[?(@.name=="http2")].nodePort}')
export PROXY_PORT_HTTPS=$(kubectl -n istio-system get service istio-ingressgateway -o jsonpath='{.spec.ports[?(@.name=="https")].nodePort}')
echo $PROXY_PORT_HTTP,$PROXY_PORT_HTTPS
32317,30794

Deploy sample service:

kubectl apply -f service.yaml

See there arev no pods before we call the service:

kubectl get pod
No resources found in default namespace.

Actually there can be some pods right after we have deployed the service, but they terminate after some time:

kubectl get pod
NAME                                              READY   STATUS              RESTARTS   AGE
helloworld-go-qnph8-deployment-5646c79d88-4fl48   0/2     ContainerCreating   0          68s
helloworld-go-qnph8-deployment-b77995578-9pb44    0/2     ContainerCreating   0          69s

kubectl get pod
NAME                                              READY   STATUS        RESTARTS   AGE
helloworld-go-qnph8-deployment-5646c79d88-4fl48   1/2     Terminating   0          3m18s

kubectl get pod
No resources found in default namespace.

Call the service and see how autoscaler starts new pods:

kubectl get ksvc
NAME            URL                                        LATESTCREATED         LATESTREADY           READY   REASON
helloworld-go   http://helloworld-go.default.example.com   helloworld-go-qnph8   helloworld-go-qnph8   True

curl -H "Host: helloworld-go.default.example.com" http://$(minikube ip):$PROXY_PORT_HTTP
Hello Go Sample v1!

kubectl get pod
NAME                                              READY   STATUS    RESTARTS   AGE
helloworld-go-qnph8-deployment-5646c79d88-s4wxb   2/2     Running   0          8s

After some time all pods terminate:

kubectl get pod
No resources found in default namespace.