Wait for default interface to come up before trying to start docker

src/middlewared/middlewared/plugins/docker/state_setup.py

@@ -6,10 +6,10 @@
 from datetime import datetime
 
 from middlewared.service import CallError, private, Service
+from middlewared.utils.interface import wait_for_default_interface_link_state_up
 
 from .state_utils import (
-    DatasetDefaults, DOCKER_DATASET_NAME, docker_datasets, IX_APPS_MOUNT_PATH, IX_APPS_DIR_NAME,
-    missing_required_datasets,
+    DatasetDefaults, DOCKER_DATASET_NAME, docker_datasets, IX_APPS_MOUNT_PATH, missing_required_datasets,
 )
 
 
@@ -52,10 +52,15 @@ async def validate_fs(self):
 
         # What we want to validate now is that the interface on default route is up and running
         # This is problematic for bridge interfaces which can or cannot come up in time
+        await self.validate_interfaces()
 
     @private
     async def validate_interfaces(self):
-        pass
+        default_iface, success = wait_for_default_interface_link_state_up()
+        if default_iface is None:
+            raise CallError('Unable to determine default interface.')
+        elif not success:
+            raise CallError(f'Default interface {default_iface!r} is not in active state')
 
     @private
     async def status_change(self):