Merge pull request #447 from viditganpi/canary-for-multi-cluster-istio

Add support for Istio multi-cluster

charts/flagger/templates/deployment.yaml

@@ -42,11 +42,22 @@ spec:
       imagePullSecrets:
         - name: {{ .Values.image.pullSecret }}
       {{- end }}
+      volumes:
+        {{- if .Values.kubeconfigHost }}
+        - name: kubeconfig
+          secret:
+            secretName: "{{ .Values.kubeconfigHost }}"
+        {{- end }}
       containers:
         - name: flagger
           securityContext:
             readOnlyRootFilesystem: true
             runAsUser: 10001
+          volumeMounts:
+            {{- if .Values.kubeconfigHost }}
+            - name: kubeconfig
+              mountPath: "/tmp/istio-host"
+            {{- end }}
           image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
           imagePullPolicy: {{ .Values.image.pullPolicy }}
           ports:
@@ -90,6 +101,9 @@ spec:
           {{- if .Values.eventWebhook }}
           - -event-webhook={{ .Values.eventWebhook }}
           {{- end }}
+          {{- if .Values.kubeconfigHost }}
+          - -kubeconfig-host=/tmp/istio-host/kubeconfig
+          {{- end }}
           livenessProbe:
             exec:
               command:

charts/flagger/values.yaml

@@ -102,3 +102,5 @@ tolerations: []
 prometheus:
   # to be used with ingress controllers
   install: false
+
+kubeconfigHost: ""

cmd/flagger/main.go

@@ -58,6 +58,7 @@ var (
 	leaderElectionNamespace  string
 	enableConfigTracking     bool
 	ver                      bool
+	kubeconfigHost           string
 )
 
 func init() {
@@ -83,6 +84,7 @@ func init() {
 	flag.StringVar(&leaderElectionNamespace, "leader-election-namespace", "kube-system", "Namespace used to create the leader election config map.")
 	flag.BoolVar(&enableConfigTracking, "enable-config-tracking", true, "Enable secrets and configmaps tracking.")
 	flag.BoolVar(&ver, "version", false, "Print version")
+	flag.StringVar(&kubeconfigHost, "kubeconfig-host", "", "Path to a kubeconfig for host cluster. Only required if cluster has a host cluster.")
 }
 
 func main() {
@@ -117,16 +119,22 @@ func main() {
 		logger.Fatalf("Error building kubernetes clientset: %v", err)
 	}
 
-	meshClient, err := clientset.NewForConfig(cfg)
-	if err != nil {
-		logger.Fatalf("Error building mesh clientset: %v", err)
-	}
-
 	flaggerClient, err := clientset.NewForConfig(cfg)
 	if err != nil {
 		logger.Fatalf("Error building flagger clientset: %s", err.Error())
 	}
 
+	//if host kube config is there than this should be spawned with host kubeconfig
+	cfgHost, err := clientcmd.BuildConfigFromFlags(masterURL, kubeconfigHost)
+	if err != nil {
+		logger.Fatalf("Error building host kubeconfig: %v", err)
+	}
+
+	meshClient, err := clientset.NewForConfig(cfgHost)
+	if err != nil {
+		logger.Fatalf("Error building mesh clientset: %v", err)
+	}
+
 	verifyCRDs(flaggerClient, logger)
 	verifyKubernetesVersion(kubeClient, logger)
 	infos := startInformers(flaggerClient, logger, stopCh)