Update everything to be Kubernetes 1.9+

README.md

@@ -11,7 +11,7 @@ This software is currently alpha, and subject to change. Not to be used in produ
 - Client SDKs for integration with dedicated game servers to work with Agones.
 
 ## Requirements
-- Requires a Kubernetes cluster of version 1.8+
+- Requires a Kubernetes cluster of version 1.9+
 - Open the firewall access for the range of ports that Game Servers can be connected to in the cluster.
 - Game Servers must have the [project SDK](sdks) integrated, to manage Game Server state, health checking, etc.
 

build/Makefile

@@ -259,7 +259,7 @@ clean-gcloud-config:
 # Use MINIKUBE_DRIVER variable to change the VM driver
 # (defaults virtualbox for Linux and macOS, hyperv for windows) if you so desire.
 minikube-test-cluster: minikube-agones-profile
-	$(MINIKUBE) start --kubernetes-version v1.8.0 --vm-driver $(MINIKUBE_DRIVER)
+	$(MINIKUBE) start --kubernetes-version v1.9.0 --vm-driver $(MINIKUBE_DRIVER)
 	$(MAKE) minikube-post-start
 
 # switch to the agones cluster

build/gke-test-cluster/cluster.yml.jinja

@@ -21,6 +21,7 @@ resources:
     cluster:
       name: test-cluster
       description: Test cluster for Agones
+      initialClusterVersion: 1.9.2-gke.1 # be specific until 1.9.x becomes default
       nodePools:
         - name: "default"
           initialNodeCount: 3