MariaDB: Enable clean shutdown of pods

This PS adds a execstop command to pods, letting them shut down
cleanly.

Change-Id: Ic5fb1edbff5f380870858c8e5f1b676560e33a8c

mariadb/templates/bin/_stop.sh.tpl

@@ -0,0 +1,24 @@
+#!/bin/bash
+{{/*
+Copyright 2017 The Openstack-Helm Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/}}
+
+set -xe
+
+exec mysqladmin \
+    --defaults-file=/etc/mysql/admin_user.cnf \
+    --host=localhost \
+    --connect-timeout 2 \
+    shutdown

mariadb/templates/configmap-bin.yaml

@@ -26,4 +26,6 @@ data:
 {{ tuple "bin/_readiness.sh.tpl" . | include "helm-toolkit.utils.template" | indent 4 }}
   start.sh: |
 {{ tuple "bin/_start.sh.tpl" . | include "helm-toolkit.utils.template" | indent 4 }}
+  stop.sh: |
+{{ tuple "bin/_stop.sh.tpl" . | include "helm-toolkit.utils.template" | indent 4 }}
 {{- end }}

mariadb/templates/statefulset.yaml

@@ -62,8 +62,6 @@ spec:
           image: {{ .Values.images.tags.mariadb }}
           imagePullPolicy: {{ .Values.images.pull_policy }}
 {{ tuple $envAll $envAll.Values.pod.resources.server | include "helm-toolkit.snippets.kubernetes_resources" | indent 10 }}
-          command:
-            - /tmp/start.sh
           env:
             - name: POD_IP
               valueFrom:
@@ -90,6 +88,13 @@ spec:
                 secretKeyRef:
                   name: mariadb-db-root-password
                   key: MYSQL_ROOT_PASSWORD
+          command:
+            - /tmp/start.sh
+          lifecycle:
+            preStop:
+              exec:
+                command:
+                  - /tmp/stop.sh
           readinessProbe:
             initialDelaySeconds: 30
             periodSeconds: 30
@@ -100,14 +105,18 @@ spec:
           volumeMounts:
             - name: mycnfd
               mountPath: /etc/mysql/conf.d
-            - name: mariadb-bin
-              mountPath: /tmp/readiness.sh
-              subPath: readiness.sh
-              readOnly: true
             - name: mariadb-bin
               mountPath: /tmp/start.sh
               subPath: start.sh
               readOnly: true
+            - name: mariadb-bin
+              mountPath: /tmp/stop.sh
+              subPath: stop.sh
+              readOnly: true
+            - name: mariadb-bin
+              mountPath: /tmp/readiness.sh
+              subPath: readiness.sh
+              readOnly: true
             - name: mariadb-etc
               mountPath: /etc/mysql/my.cnf
               subPath: my.cnf