Heat: Add rolling update strategy

This ps adds a rolling update strategy to heat, bringing it inline
with other core services.

Change-Id: I702f2f351b4b34f68530617738e3d1566b71f0df

heat/templates/deployment-api.yaml

@@ -22,6 +22,14 @@ metadata:
   name: heat-api
 spec:
   replicas: {{ .Values.replicas.api }}
+  revisionHistoryLimit: {{ .Values.upgrades.revision_history }}
+  strategy:
+    type: {{ .Values.upgrades.pod_replacement_strategy }}
+    {{ if eq .Values.upgrades.pod_replacement_strategy "RollingUpdate" }}
+    rollingUpdate:
+      maxUnavailable: {{ .Values.upgrades.rolling_update.max_unavailable }}
+      maxSurge: {{ .Values.upgrades.rolling_update.max_surge }}
+    {{ end }}
   template:
     metadata:
       labels:

heat/templates/deployment-cfn.yaml

@@ -22,6 +22,14 @@ metadata:
   name: heat-cfn
 spec:
   replicas: {{ .Values.replicas.cfn }}
+  revisionHistoryLimit: {{ .Values.upgrades.revision_history }}
+  strategy:
+    type: {{ .Values.upgrades.pod_replacement_strategy }}
+    {{ if eq .Values.upgrades.pod_replacement_strategy "RollingUpdate" }}
+    rollingUpdate:
+      maxUnavailable: {{ .Values.upgrades.rolling_update.max_unavailable }}
+      maxSurge: {{ .Values.upgrades.rolling_update.max_surge }}
+    {{ end }}
   template:
     metadata:
       labels:

heat/templates/deployment-cloudwatch.yaml

@@ -22,6 +22,14 @@ metadata:
   name: heat-cloudwatch
 spec:
   replicas: {{ .Values.replicas.cloudwatch }}
+  revisionHistoryLimit: {{ .Values.upgrades.revision_history }}
+  strategy:
+    type: {{ .Values.upgrades.pod_replacement_strategy }}
+    {{ if eq .Values.upgrades.pod_replacement_strategy "RollingUpdate" }}
+    rollingUpdate:
+      maxUnavailable: {{ .Values.upgrades.rolling_update.max_unavailable }}
+      maxSurge: {{ .Values.upgrades.rolling_update.max_surge }}
+    {{ end }}
   template:
     metadata:
       labels:

heat/values.yaml

@@ -41,6 +41,13 @@ images:
   dep_check: docker.io/kolla/ubuntu-source-kubernetes-entrypoint:4.0.0
   pull_policy: "IfNotPresent"
 
+upgrades:
+  revision_history: 3
+  pod_replacement_strategy: RollingUpdate
+  rolling_update:
+    max_unavailable: 1
+    max_surge: 3
+
 keystone_secrets:
   admin: "heat-env-keystone-admin"
   user: "heat-env-keystone-user"