[stable/memcached] Add updateStrategy configuration option (#16358)

* [stable/memcached] Add updateStrategy configuration option

Signed-off-by: Remington Reackhof <rreackhof@rmn.com>

* [stable/memcached] Set specific keys for updateStrategy to follow convention

Signed-off-by: Remington Reackhof <rreackhof@rmn.com>

* [stable/memcached] Fix README to reflect updateStrategy.type value requirement

Signed-off-by: Remington Reackhof <rreackhof@rmn.com>

stable/memcached/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: memcached
-version: 2.9.0
+version: 2.10.0
 appVersion: 1.5.12
 description: Free & open source, high-performance, distributed memory object caching
   system.

stable/memcached/README.md

@@ -62,6 +62,7 @@ The following table lists the configurable parameters of the Memcached chart and
 | `securityContext.enabled`  | Enable security context    | `true`                                                       |
 | `securityContext.fsGroup`  | Group ID for the container | `1001`                                                       |
 | `securityContext.runAsUser`| User ID for the container  | `1001`                                                       |
+| `updateStrategy.type`      | Update strategy for the StatefulSet/Deployment | `RollingUpdate`                          |
 
 The above parameters map to `memcached` params. For more information please refer to the [Memcached documentation](https://github.com/memcached/memcached/wiki/ConfiguringServer).
 

stable/memcached/templates/statefulset.yaml

@@ -119,3 +119,8 @@ spec:
       affinity:
 {{ toYaml . | trim | indent 8}}
 {{- end }}
+  updateStrategy:
+    type: {{ .Values.updateStrategy.type }}
+    {{- if (eq "Recreate" .Values.updateStrategy.type) }}
+    rollingUpdate: null
+    {{- end }}

stable/memcached/values.yaml

@@ -42,6 +42,12 @@ serviceAnnotations: {}
 ## StatefulSet or Deployment
 kind: StatefulSet
 
+## Update Strategy for the StatefulSet or Deployment
+## ref: https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/#update-strategies
+## ref: https://kubernetes.io/docs/concepts/workloads/controllers/deployment/#updating-a-deployment
+updateStrategy:
+  type: RollingUpdate
+
 ## Configure resource requests and limits
 ## ref: http://kubernetes.io/docs/user-guide/compute-resources/
 ##