Network Timeout when initializing with beanie

[JodyZ0203]

I was using beanie to initialize a mongodb instance, but ran into this error:

backend_1  | ERROR:    Traceback (most recent call last):
backend_1  |   File "/usr/local/lib/python3.9/site-packages/starlette/routing.py", line 677, in lifespan
backend_1  |     async with self.lifespan_context(app) as maybe_state:
backend_1  |   File "/usr/local/lib/python3.9/site-packages/starlette/routing.py", line 566, in __aenter__
backend_1  |     await self._router.startup()
backend_1  |   File "/usr/local/lib/python3.9/site-packages/starlette/routing.py", line 654, in startup
backend_1  |     await handler()
backend_1  |   File "/app/app.py", line 66, in on_startup
backend_1  |     await init_beanie(
backend_1  |   File "/usr/local/lib/python3.9/site-packages/beanie/odm/utils/init.py", line 530, in init_beanie
backend_1  |     await Initializer(
backend_1  |   File "/usr/local/lib/python3.9/site-packages/beanie/odm/utils/init.py", line 89, in __await__
backend_1  |     yield from self.init_class(model).__await__()
backend_1  |   File "/usr/local/lib/python3.9/site-packages/beanie/odm/utils/init.py", line 500, in init_class
backend_1  |     await self.init_document(cls)
backend_1  |   File "/usr/local/lib/python3.9/site-packages/beanie/odm/utils/init.py", line 324, in init_document
backend_1  |     build_info = await self.database.command({"buildInfo": 1})
backend_1  |   File "/usr/local/lib/python3.9/concurrent/futures/thread.py", line 58, in run
backend_1  |     result = self.fn(*self.args, **self.kwargs)
backend_1  |   File "/usr/local/lib/python3.9/site-packages/pymongo/_csot.py", line 105, in csot_wrapper
backend_1  |     return func(self, *args, **kwargs)
backend_1  |   File "/usr/local/lib/python3.9/site-packages/pymongo/database.py", line 805, in command
backend_1  |     with self.__client._socket_for_reads(read_preference, session) as (
backend_1  |   File "/usr/local/lib/python3.9/site-packages/pymongo/mongo_client.py", line 1296, in _socket_for_reads
backend_1  |     server = self._select_server(read_preference, session)
backend_1  |   File "/usr/local/lib/python3.9/site-packages/pymongo/mongo_client.py", line 1257, in _select_server
backend_1  |     server = topology.select_server(server_selector)
backend_1  |   File "/usr/local/lib/python3.9/site-packages/pymongo/topology.py", line 272, in select_server
backend_1  |     server = self._select_server(selector, server_selection_timeout, address)
backend_1  |   File "/usr/local/lib/python3.9/site-packages/pymongo/topology.py", line 261, in _select_server
backend_1  |     servers = self.select_servers(selector, server_selection_timeout, address)
backend_1  |   File "/usr/local/lib/python3.9/site-packages/pymongo/topology.py", line 223, in select_servers
backend_1  |     server_descriptions = self._select_servers_loop(selector, server_timeout, address)
backend_1  |   File "/usr/local/lib/python3.9/site-packages/pymongo/topology.py", line 238, in _select_servers_loop
backend_1  |     raise ServerSelectionTimeoutError(
backend_1  | pymongo.errors.ServerSelectionTimeoutError: mongodb:27017: timed out, Timeout: 30s, Topology Description: <TopologyDescription id: 6453dcfc0c059f2eb729b5d4, topology_type: Unknown, servers: [<ServerDescription ('mongodb', 27017) server_type: Unknown, rtt: None, error=NetworkTimeout('mongodb:27017: timed out')>]>
backend_1  | 
backend_1  | ERROR:    Application startup failed. Exiting.

code to initialize beanie is

DATABASE_URL = "mongodb://mongodb:27017/"

client = motor.motor_asyncio.AsyncIOMotorClient(
    DATABASE_URL, uuidRepresentation="standard"
)
db = client["database_name"]

@app.on_event("startup")
async def on_startup():
    await init_beanie(
        database=db,
        document_models=[
            User,
        ],
    )

My docker file is

version: "3"

services:
  backend:
    build: .
    ports:
      - "8080:8080"
    restart: unless-stopped
    depends_on:
      - mongodb

  mongodb:
    image: mongo:latest
    ports:
      - '27017:27017'
    restart: unless-stopped

[roman-right]

Hi! For just motor connection it works well? Can you run any find query with motor?

[amirsalaar]

I had the same issue. It turned out to be a networking issue between containers.

@JodyZ0203 for my case I was defining my mongodb outside the docker compose on a different network. See https://docs.docker.com/compose/networking/