Add support for multiple replicas and anti affinity to grafana (#3476)

stable/grafana/Chart.yaml

@@ -1,5 +1,5 @@
 name: grafana
-version: 0.6.2
+version: 0.7.0
 description: The leading tool for querying and visualizing time series and metrics.
 home: https://grafana.net
 icon: https://raw.githubusercontent.com/grafana/grafana/master/public/img/logo_transparent_400x.png

stable/grafana/README.md

@@ -34,6 +34,8 @@ The command removes all the Kubernetes components associated with the chart and
 | `server.image`                            | Container image to run              | grafana/grafana:4.6.3                             |
 | `server.adminUser`                        | Admin user username                 | admin                                             |
 | `server.adminPassword`                    | Admin user password                 | Randomly generated                                |
+| `server.antiAffinity.enabled`             | Enable anti affinity                | false                                             |
+| `server.antiAffinity.type`                | Hard or soft anti affinity          | hard                                              |
 | `server.persistentVolume.enabled`         | Create a volume to store data       | true                                              |
 | `server.persistentVolume.size`            | Size of persistent volume claim     | 1Gi RW                                            |
 | `server.persistentVolume.storageClass`    | Type of persistent volume claim     | `nil` (uses alpha storage class annotation)       |
@@ -41,6 +43,7 @@ The command removes all the Kubernetes components associated with the chart and
 | `server.persistentVolume.existingClaim`   | Existing persistent volume claim    | null                                              |
 | `server.persistentVolume.subPath`         | Subdirectory of pvc to mount        | null                                              |
 | `server.readinessProbe`                   | Server readiness probe              | httpGet: {path: /api/health, port: 3000}, initialDelaySeconds: 30, timeoutSeconds: 30 |
+| `server.replicaCount`                     | Desired number of grafana pods      | 1                                                 |
 | `server.resources`                        | Server resource requests and limits | requests: {cpu: 100m, memory: 100Mi}              |
 | `server.tolerations`                      | node taints to tolerate (requires Kubernetes >=1.6) | null |
 | `server.service.annotations`              | Service annotations                 | null                                              |

stable/grafana/templates/deployment.yaml

@@ -9,7 +9,7 @@ metadata:
     release: "{{ .Release.Name }}"
   name: {{ template "grafana.server.fullname" . }}
 spec:
-  replicas: 1
+  replicas: {{ .Values.server.replicaCount }}
   template:
     metadata:
       annotations:
@@ -29,6 +29,27 @@ spec:
       tolerations:
 {{ toYaml .Values.server.tolerations | indent 8 }}
   {{- end }}
+      {{- if .Values.server.antiAffinity.enabled }}
+      affinity:
+        podAntiAffinity:
+          {{- $antiAffinityType := default "hard" .Values.server.antiAffinity.type | lower }}
+          {{- if eq $antiAffinityType "hard" }}
+          requiredDuringSchedulingIgnoredDuringExecution:
+          - topologyKey: "kubernetes.io/hostname"
+            labelSelector:
+              matchLabels:
+                app: {{ template "grafana.server.fullname" . }}
+          {{- end }}
+          {{- if eq $antiAffinityType "soft" }}
+          preferredDuringSchedulingIgnoredDuringExecution:
+          - weight: 1
+            podAffinityTerm:
+              topologyKey: "kubernetes.io/hostname"
+              labelSelector:
+                matchLabels:
+                  app: {{ template "grafana.server.fullname" . }}
+          {{- end }}
+      {{- end }}
       containers:
         - name: {{ template "grafana.name" . }}
           image: "{{ .Values.server.image }}"

stable/grafana/values.yaml

@@ -12,6 +12,14 @@ server:
   nodeSelector: {}
   tolerations: []
 
+  # Multiple replicas do not work with the default sqlite database,
+  # see http://docs.grafana.org/tutorials/ha_setup/.
+  replicaCount: 1
+
+  antiAffinity:
+    enabled: false
+    type: hard
+
   ingress:
     ## If true, Grafana Ingress will be created
     ##