Fix mariadb config file permissions and restart pod on config change

Mariadb is using default conf as the conf file is not readable by the mysql user.
Also pass the config hash as an env to the pod to ensure it is recreated when
the config changes.

Author: olliewalsh

controllers/mariadb_controller.go

@@ -295,6 +295,16 @@ func (r *MariaDBReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ct
 
 	op, err = controllerutil.CreateOrPatch(ctx, r.Client, pod, func() error {
 		pod.Spec.Containers[0].Image = instance.Spec.ContainerImage
+		pod.Spec.Containers[0].Env = []corev1.EnvVar{
+			{
+				Name:  "KOLLA_CONFIG_STRATEGY",
+				Value: "COPY_ALWAYS",
+			},
+			{
+				Name:  "CONFIG_HASH",
+				Value: configHash,
+			},
+		}
 		err := controllerutil.SetControllerReference(instance, pod, r.Scheme)
 		if err != nil {
 			return err

templates/mariadb/bin/config.json

@@ -4,7 +4,7 @@
         {
             "source": "/var/lib/config-data/galera.cnf",
             "dest": "/etc/my.cnf.d/galera.cnf",
-            "owner": "root",
+            "owner": "mysql",
             "perm": "0600"
         }
     ]

templates/mariadb/bin/galera.cnf

@@ -7,7 +7,7 @@ key_buffer_size = 16M
 
 [mysqld]
 basedir = /usr
-bind-address = 127.0.0.1
+bind-address = *
 datadir = /var/lib/mysql
 expire_logs_days = 10
 innodb_file_per_table = ON

templates/mariadb/bin/init_config.json

@@ -4,7 +4,7 @@
         {
             "source": "/var/lib/config-data/galera.cnf",
             "dest": "/etc/my.cnf.d/galera.cnf",
-            "owner": "root",
+            "owner": "mysql",
             "perm": "0600"
         },
         {