the redis host needs to be configured for channel layers

otherwise the post migration signal in django will try to establish an connection to localhost, no matter what redis server ip or adress was entered

openslides/utils/settings.py.tpl

@@ -82,10 +82,15 @@ if use_redis:
     # Django Channels
 
     # https://channels.readthedocs.io/en/latest/topics/channel_layers.html#configuration
-
+    CHANNEL_LAYERS = {
-    CHANNEL_LAYERS['default']['BACKEND'] = 'channels_redis.core.RedisChannelLayer'
+        "default": {
-    CHANNEL_LAYERS['default']['CONFIG'] = {"capacity": 100000}
+            "BACKEND": "channels_redis.core.RedisChannelLayer",
-
+            "CONFIG": {
+                "hosts": [("localhost", 6379)],
+                "capacity": 100000,
+            },
+        },
+    }
     # Collection Cache
 
     # Can be: