Update Memcached Chart to increase image portability

This commit updates the Memcached chart to allow use with images other than Stackanetes, define ImagePullPolicy, and provide config params in the values.yaml.

memcached/templates/deployment.yaml

@@ -3,7 +3,7 @@ kind: Deployment
 metadata:
   name: memcached
 spec:
-  replicas: 1
+  replicas: {{ .Values.resources.memcached.replicas }}
   template:
     metadata:
       labels:
@@ -14,20 +14,15 @@ spec:
       containers:
         - name: memcached
           image: {{ .Values.images.memcached }}
-          imagePullPolicy: Always
-          env:
-            - name: INTERFACE_NAME
-              value: "eth0"
-            - name: POD_NAME
-              valueFrom:
-                fieldRef:
-                  fieldPath: metadata.name
-            - name: NAMESPACE
-              valueFrom:
-                fieldRef:
-                  fieldPath: metadata.namespace
-            - name: COMMAND
-              value: "memcached -v -p {{ .Values.network.port }} -U 0 -c 8192 -m 1024"
+          imagePullPolicy: {{ .Values.images.pull_policy }}
+          command: ["sh", "-xec"]
+          args:
+            - |
+              exec memcached -v \
+                -p {{ .Values.network.port }} \
+                -U 0 \
+                -c {{ .Values.memcached.max_connections }} \
+                -m {{ .Values.memcached.memory }};
           ports:
             - containerPort: {{ .Values.network.port }}
           readinessProbe:

memcached/values.yaml

@@ -5,6 +5,7 @@
 
 images:
   memcached: quay.io/stackanetes/stackanetes-memcached:newton
+  pull_policy: "IfNotPresent"
 
 labels:
   node_selector_key: openstack-control-plane
@@ -12,3 +13,11 @@ labels:
 
 network:
   port: 11211
+
+memcached:
+  memory: 1024
+  max_connections: 8192
+
+resources:
+  memcached:
+    replicas: 1