use statefulset for mariadb

kustomize/base/mariadb/kustomization.yaml

@@ -1,5 +1,5 @@
 resources:
-  - mariadb-deployment.yaml
+  - mariadb-statefulset.yaml
 
 secretGenerator:
   - name: mariadb-credentials-secret

kustomize/base/mariadb/mariadb-statefulset.yaml

@@ -1,13 +1,12 @@
 apiVersion: apps/v1
-kind: Deployment
+kind: StatefulSet
 metadata:
-  name: mariadb-deployment
+  name: mariadb-statefulset
 spec:
   selector:
     matchLabels:
       app: mariadb
-  strategy:
-    type: Recreate
+  serviceName: mariadb
   template:
     metadata:
       labels:
@@ -40,23 +39,15 @@ spec:
           volumeMounts:
             - name: mariadb-pvc
               mountPath: /var/lib/mysql
-      volumes:
-        - name: mariadb-pvc
-          persistentVolumeClaim:
-            claimName: mariadb-pvc
----
-apiVersion: v1
-kind: PersistentVolumeClaim
-metadata:
-  name: mariadb-pvc
-  labels:
-    app: mariadb
-spec:
-  accessModes:
-    - ReadWriteOnce
-  resources:
-    requests:
-      storage: 20Gi
+  volumeClaimTemplates:
+    - metadata:
+        name: mariadb-pvc
+      spec:
+        accessModes:
+          - ReadWriteOnce
+        resources:
+          requests:
+            storage: 20Gi
 ---
 apiVersion: v1
 kind: Service