TravisCI KUBERNETES_VERSION variable improved

.travis.yml

@@ -13,8 +13,7 @@ addons:
 env:
   global:
     - CHANGE_MINIKUBE_NONE_USER=true
-    # curl --silent "https://api.github.com/repos/kubernetes/minikube/releases/latest" | sed -n 's/.*"tag_name": "v\([^"]*\)",/\1/p'
-    - KUBERNETES_VERSION="1.13.2"
+    - KUBERNETES_VERSION=$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)
     # curl -L -s https://api.github.com/repos/istio/istio/releases/latest | grep tag_name | sed "s/ *\"tag_name\": *\"\\(.*\\)\",*/\\1/"
     - ISTIO_VERSION="1.0.5"
 
@@ -31,10 +30,10 @@ before_script:
   # Make root mounted as rshared to fix kube-dns issues.
   - sudo mount --make-rshared /
   # Download kubectl, which is a requirement for using minikube.
-  - curl -Lo kubectl https://storage.googleapis.com/kubernetes-release/release/v${KUBERNETES_VERSION}/bin/linux/amd64/kubectl && chmod +x kubectl && sudo mv kubectl /usr/local/bin/
+  - curl -Lo kubectl https://storage.googleapis.com/kubernetes-release/release/${KUBERNETES_VERSION}/bin/linux/amd64/kubectl && chmod +x kubectl && sudo mv kubectl /usr/local/bin/
   # Download minikube.
   - curl -Lo minikube https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64 && chmod +x minikube && sudo mv minikube /usr/local/bin/
-  - sudo minikube start --vm-driver=none --bootstrapper=kubeadm --kubernetes-version=v${KUBERNETES_VERSION}
+  - sudo minikube start --vm-driver=none --bootstrapper=kubeadm --kubernetes-version=${KUBERNETES_VERSION}
   # Fix the kubectl context, as it's often stale.
   - minikube update-context
   # Wait for Kubernetes to be up and ready.

install-k8s-kubeadm.sh

@@ -3,7 +3,7 @@
 MYUSER="ubuntu"
 SSH_ARGS="-o LogLevel=ERROR -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no"
 POD_NETWORK_CIDR="10.244.0.0/16"
-KUBERNETES_VERSION="1.13.2"
+KUBERNETES_VERSION=$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt | tr -d v)
 CNI_URL="https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml"
 
 INSTALL_KUBERNETES="