我有一个 django 使用的应用程序 channels , channels_redis 以及 graphene_subscriptions . graphene_subscriptions 用于通过发布消息 channels 保存数据库模型示例时( DATABASE_MODEL_INSTANCE.save() ).
django应用程序和 redis （当然还有fullstack应用程序的其他部分）是使用单独的docker容器运行的 docker-compose . 当我运行安装程序时 docker-compose 在linux上的网络模式主机中，一切都很好。但是，如果使用自定义网络（一个用于后端，一个用于前端）重新配置网络模式网桥的设置，并使用 docker-compose 我得到以下错误：

c_backend    |   File "./APP_SPECIFIC_PATH/FILE.py", line X, in FUNCTION
c_backend    |     DATABASE_MODEL_INSTANCE.save()
c_backend    |   File "/usr/local/lib/python3.7/site-packages/django/db/models/base.py", line 746, in save
c_backend    |     force_update=force_update, update_fields=update_fields)
c_backend    |   File "/usr/local/lib/python3.7/site-packages/django/db/models/base.py", line 795, in save_base
c_backend    |     update_fields=update_fields, raw=raw, using=using,
c_backend    |   File "/usr/local/lib/python3.7/site-packages/django/dispatch/dispatcher.py", line 175, in send
c_backend    |     for receiver in self._live_receivers(sender)
c_backend    |   File "/usr/local/lib/python3.7/site-packages/django/dispatch/dispatcher.py", line 175, in <listcomp>
c_backend    |     for receiver in self._live_receivers(sender)
c_backend    |   File "/usr/local/lib/python3.7/site-packages/graphene_subscriptions/signals.py", line 15, in post_save_subscription
c_backend    |     event.send()
c_backend    |   File "/usr/local/lib/python3.7/site-packages/graphene_subscriptions/events.py", line 20, in send
c_backend    |     "subscriptions", {"type": "signal.fired", "event": self.to_dict()}
c_backend    |   File "/usr/local/lib/python3.7/site-packages/asgiref/sync.py", line 116, in __call__
c_backend    |     return call_result.result()
c_backend    |   File "/usr/local/lib/python3.7/concurrent/futures/_base.py", line 428, in result
c_backend    |     return self.__get_result()
c_backend    |   File "/usr/local/lib/python3.7/concurrent/futures/_base.py", line 384, in __get_result
c_backend    |     raise self._exception
c_backend    |   File "/usr/local/lib/python3.7/site-packages/asgiref/sync.py", line 156, in main_wrap
c_backend    |     result = await self.awaitable(*args,**kwargs)
c_backend    |   File "/usr/local/lib/python3.7/site-packages/channels_redis/core.py", line 614, in group_send
c_backend    |     async with self.connection(self.consistent_hash(group)) as connection:
c_backend    |   File "/usr/local/lib/python3.7/site-packages/channels_redis/core.py", line 835, in __aenter__
c_backend    |     self.conn = await self.pool.pop()
c_backend    |   File "/usr/local/lib/python3.7/site-packages/channels_redis/core.py", line 73, in pop
c_backend    |     conns.append(await aioredis.create_redis(**self.host, loop=loop))
c_backend    |   File "/usr/local/lib/python3.7/site-packages/aioredis/commands/__init__.py", line 175, in create_redis
c_backend    |     loop=loop)
c_backend    |   File "/usr/local/lib/python3.7/site-packages/aioredis/connection.py", line 113, in create_connection
c_backend    |     timeout)
c_backend    |   File "/usr/local/lib/python3.7/asyncio/tasks.py", line 414, in wait_for
c_backend    |     return await fut
c_backend    |   File "/usr/local/lib/python3.7/site-packages/aioredis/stream.py", line 24, in open_connection
c_backend    |     lambda: protocol, host, port,**kwds)
c_backend    |   File "/usr/local/lib/python3.7/asyncio/base_events.py", line 909, in create_connection
c_backend    |     type=socket.SOCK_STREAM, proto=proto, flags=flags, loop=self)
c_backend    |   File "/usr/local/lib/python3.7/asyncio/base_events.py", line 1286, in _ensure_resolved
c_backend    |     proto=proto, flags=flags)
c_backend    |   File "/usr/local/lib/python3.7/asyncio/base_events.py", line 788, in getaddrinfo
c_backend    |     None, getaddr_func, host, port, family, type, proto, flags)
c_backend    |   File "/usr/local/lib/python3.7/concurrent/futures/thread.py", line 57, in run
c_backend    |     result = self.fn(*self.args,**self.kwargs)
c_backend    |   File "/usr/local/lib/python3.7/socket.py", line 752, in getaddrinfo
c_backend    |     for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
c_backend    | socket.gaierror: [Errno -2] Name or service not known

我的开发配置如下所示。
节选 settings.py 文件：

CHANNEL_LAYERS = {
    "default": {
        "BACKEND": "channels_redis.core.RedisChannelLayer",
        "CONFIG": {
            "hosts": [("redis", 6379)],
        },
    },
}

节选 redis.conf 文件：

# bind 127.0.0.1

protected-mode no

节选 nginx.conf 文件：

upstream django {
  server django:8080;
}

server {
  listen 8000;
  listen [::]:8000;

  location /graphql/subscriptions {
    proxy_pass http://django/graphql/subscriptions;

    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";

    proxy_redirect off;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Host $server_name;
  }
}

节选 docker-compose.yml 文件：

version: "3.5"
services:
  redis:
    image: redis:5.0.7-alpine
    hostname: redis
    container_name: c_redis
    networks:
      - nw_backend
    ports:
      - "6379:6379"
    volumes:
      - ./redis/redis.conf:/usr/local/etc/redis/redis.conf:ro
    command: [ "redis-server", "/usr/local/etc/redis/redis.conf" ]
  nginx:
    image: nginx:1.17.9-alpine
    hostname: nginx
    container_name: c_nginx
    networks:
      - nw_frontend
      - nw_backend
    expose:
      - "80"
      - "8000"
    ports:
      - "80:8000"
      - "8000:8000"
    volumes:
      - ./nginx/nginx.conf:/etc/nginx/conf.d/nginx.conf:ro
    depends_on:
      - django
  django:
    hostname: django
    container_name: c_django
    ports:
      - "8080:8080"
    depends_on:
      - redis
      - database
    networks:
      - nw_frontend
      - nw_backend
networks:
  nw_frontend:
    driver: bridge
    name: n_frontend
  nw_backend:
    driver: bridge
    name: n_backend

配置过程中我遗漏了什么？