Create a GKE Kubernetes cluster (with Istio addon enabled) and install Knative on top of it

create-gke-k8s-knative-cluster.sh

#!/usr/bin/env bash
set -ex

if [ -z "$GCP_PROJECT_ID" ] ; then
  echo '[!] GCP_PROJECT_ID is not set - required'
  exit 1
fi
gcloud config set project "$GCP_PROJECT_ID"

function create_gke_cluster_with_istio {
  # To see which GKE versions are supported/recommended for
  # Cloud Run on GKE: https://cloud.google.com/run/docs/gke/cluster-versions
  gcloud beta container clusters create knativeexp \
    --addons=HorizontalPodAutoscaling,HttpLoadBalancing,Istio \
    --machine-type=n1-standard-4 \
    --cluster-version=1.12.6 --zone=us-central1-a \
    --enable-stackdriver-kubernetes --enable-ip-alias \
    --scopes cloud-platform
}

function install_knative {
  kubectl apply --filename https://github.com/knative/serving/releases/download/v0.5.0/serving.yaml \
   --filename https://github.com/knative/eventing/releases/download/v0.5.0/release.yaml \
   --filename https://github.com/knative/eventing-sources/releases/download/v0.5.0/eventing-sources.yaml \
   --filename https://github.com/knative/serving/releases/download/v0.5.0/monitoring.yaml \
   --filename https://raw.githubusercontent.com/knative/serving/v0.5.0/third_party/config/build/clusterrole.yaml
}

# MAIN

create_gke_cluster_with_istio
# re-run the install - known issue: https://github.com/knative/serving/issues/2940
install_knative || install_knative