[stable/mongodb-replicaset] Add pod anti-affinity (#1606)

Adds pod anti-affinity with "soft" and "hard" option, "soft" being the default.

stable/mongodb-replicaset/Chart.yaml

@@ -1,6 +1,6 @@
 name: mongodb-replicaset
 home: https://github.com/mongodb/mongo
-version: 1.1.0
+version: 1.2.0
 description: NoSQL document-oriented database that stores JSON-like documents with dynamic schemas, simplifying the integration of data in content-driven applications.
 icon: https://webassets.mongodb.com/_com_assets/cms/mongodb-logo-rgb-j6w271g1xn.jpg
 sources:

stable/mongodb-replicaset/templates/mongodb-statefulset.yaml

@@ -160,6 +160,27 @@ spec:
               mountPath: /keydir
               readOnly: true
           {{- end }}
+      {{- if eq .Values.podAntiAffinity "hard" }}
+      affinity:
+        podAntiAffinity:
+          requiredDuringSchedulingIgnoredDuringExecution:
+            - topologyKey: "kubernetes.io/hostname"
+              labelSelector:
+                matchLabels:
+                  app: "{{ template "name" . }}"
+                  release: "{{ .Release.Name }}"
+      {{- else if eq .Values.podAntiAffinity "soft" }}
+      affinity:
+        podAntiAffinity:
+          preferredDuringSchedulingIgnoredDuringExecution:
+            - weight: 1
+              podAffinityTerm:
+                topologyKey: kubernetes.io/hostname
+                labelSelector:
+                  matchLabels:
+                    app: "{{ template "name" . }}"
+                    release: "{{ .Release.Name }}"
+      {{- end }}
       volumes:
         - name: config
           configMap:

stable/mongodb-replicaset/values.yaml

@@ -25,6 +25,8 @@ image:
 # Annotations to be added to MongoDB pods
 podAnnotations: {}
 
+podAntiAffinity: "soft"
+
 resources: {}
 # limits:
 #   cpu: 100m