Merge pull request #1018 from Azure/jonachang/istiocheck

Add extra step to check the health of istio version before update

dev-infrastructure/scripts/istio.sh

@@ -1,6 +1,13 @@
 #!/bin/bash
 
 set -euo pipefail
+ISTIO_NAMESPACE="aks-istio-system"
+echo "********** Check istio is up and running **************"
+ISTIO_PODS_COUNT=$(kubectl get pods -n ${ISTIO_NAMESPACE} -l istio.io/rev="${TARGET_VERSION}" --field-selector=status.phase=Running --no-headers | wc -l)
+if [[ $ISTIO_PODS_COUNT -lt 2 ]]; then
+    echo "Istio pods are not running, Please check the istio pods"
+    exit 1
+fi
 
 echo "********** Download istioctl **************"
 # Determines the operating system.
@@ -53,7 +60,7 @@ cd istio-"${ISTIOCTL_VERSION}"
 export PATH=$PWD/bin:$PATH
 echo "=========================================================================="
 
-ISTIO_NAMESPACE="aks-istio-system"
+
 
 echo "********** ISTIO Upgrade **************"
 # Followed this guide for istio upgrade https://learn.microsoft.com/en-us/azure/aks/istio-upgrade