add persist storage to prometheus

istio-telemetry/prometheus/templates/deployment.yaml

@@ -33,6 +33,7 @@ spec:
           imagePullPolicy: {{ .Values.global.imagePullPolicy | default "Always" }}
           args:
             - '--storage.tsdb.retention={{ .Values.prometheus.retention }}'
+            - '--storage.tsdb.path=/data'
             - '--config.file=/etc/prometheus/prometheus.yml'
           ports:
             - containerPort: 9090
@@ -56,6 +57,8 @@ spec:
             mountPath: /etc/prometheus
           - mountPath: /etc/istio-certs
             name: istio-certs
+          - mountPath: /data
+            name: data
       volumes:
       - name: config-volume
         configMap:
@@ -67,6 +70,13 @@ spec:
           optional: true
 {{- end }}
           secretName: istio.default
+      - name: data
+{{- if .Values.prometheus.persist }}
+        persistentVolumeClaim:
+          claimName: prometheus-pvc
+{{- else }}
+        emptyDir: {}
+{{- end }}
       affinity:
       {{- include "nodeaffinity" . | indent 6 }}
       {{- include "podAntiAffinity" . | indent 6 }}

istio-telemetry/prometheus/templates/pvc.yaml

@@ -0,0 +1,19 @@
+{{- if .Values.prometheus.persist }}
+kind: PersistentVolumeClaim
+apiVersion: v1
+metadata:
+  name: prometheus-pvc
+  namespace: {{ .Release.Namespace }}
+  labels:
+    app: prometheus
+    chart: {{ template "prometheus.chart" . }}
+    heritage: {{ .Release.Service }}
+    release: {{ .Release.Name }}
+spec:
+  storageClassName: {{ .Values.prometheus.storageClassName }}
+  accessModes:
+    - {{ .Values.prometheus.accessMode }}
+  resources:
+    requests:
+      storage: {{ .Values.prometheus.storageSize }}
+{{- end }}

istio-telemetry/prometheus/values.yaml

@@ -63,3 +63,8 @@ prometheus:
   # "security" and value "S1".
   podAntiAffinityLabelSelector: []
   podAntiAffinityTermLabelSelector: []
+
+  persist: false
+  storageClassName: ""
+  storageSize: 10Gi
+  accessMode: ReadWriteMany