Deploying Docker image results in "OSError: [Errno 99] Cannot assign requested address"

Using Streamlit
,
1
  1. Are you running your app locally or is it deployed? Deployed
  2. If your app is deployed:
    a. Is it deployed on Community Cloud or another hosting platform? Azure App Service
    b. Share the link to the public deployed app. Not publicly accessible
  3. Share the link to your app’s public GitHub repository (including a requirements file). No public repo
  4. Share the full text of the error message (not a screenshot). See below
  5. Share the Streamlit and Python versions. Streamlit 1.40 and Python 3.11

I’m creating an image with the following Dockerfile:

FROM python:3.11-slim

WORKDIR /app

COPY /app .

# Set environment variables to prevent Python from writing pyc files to disk
ENV PYTHONDONTWRITEBYTECODE 1
# Prevent Python from buffering stdout and stderr
ENV PYTHONUNBUFFERED 1

RUN apt-get update \
    && apt-get install --no-install-recommends -y \
    # deps for building python deps
    build-essential \
    && apt-get install --no-install-recommends -y libpq-dev

COPY requirements.txt ./requirements.txt
RUN pip install --no-cache-dir -r requirements.txt

EXPOSE 8501

WORKDIR /app

HEALTHCHECK CMD curl --fail http://localhost:8501/_stcore/health

ENTRYPOINT ["streamlit", "run", "app.py", "--server.port=8501", , "--server.address=0.0.0.0"]

It looks like it should work when address is set to 0.0.0.0 and a port is set such that EXPOSE and –server.port are the same in the DockerFile and these match to the WEBSITES_PORT environment variable on the app service.

However, the service log shows the following traceback:

Traceback (most recent call last): File "/usr/local/bin/streamlit", line 8, in <module>
sys.exit(main())
^^^^^^
File "/usr/local/lib/python3.11/site-packages/click/core.py", line 1157, in __call__ 
return self.main(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/click/core.py", line 1078, in main
rv = self.invoke(ctx)
^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/click/core.py", line 1688, in invoke 
return _process_result(sub_ctx.command.invoke(sub_ctx))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/click/core.py", line 1434, in invoke 
return ctx.invoke(self.callback, **ctx.params)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/click/core.py", line 783, in invoke 
return __callback(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/streamlit/web/cli.py", line 240, in main_run
_main_run(target, args, flag_options=kwargs)
File "/usr/local/lib/python3.11/site-packages/streamlit/web/cli.py", line 276, in _main_run
bootstrap.run(file, is_hello, args, flag_options)
File "/usr/local/lib/python3.11/site-packages/streamlit/web/bootstrap.py", line 329, in run
asyncio.run(run_server())
File "/usr/local/lib/python3.11/asyncio/runners.py", line 190, in run
return runner.run(main)
^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/asyncio/runners.py", line 118, in run
return self._loop.run_until_complete(task)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/asyncio/base_events.py", line 654, in run_until_complete
return future.result()
^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/streamlit/web/bootstrap.py", line 317, in run_server
await server.start()
File "/usr/local/lib/python3.11/site-packages/streamlit/web/server/server.py", line 275, in start
start_listening(app)
File "/usr/local/lib/python3.11/site-packages/streamlit/web/server/server.py", line 132, in start_listening
start_listening_tcp_socket(http_server)
File "/usr/local/lib/python3.11/site-packages/streamlit/web/server/server.py", line 199, in start_listening_tcp_socket
http_server.listen(port, address)
File "/usr/local/lib/python3.11/site-packages/tornado/tcpserver.py", line 183, in listen
sockets = bind_sockets(
^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/tornado/netutil.py", line 162, in bind_sockets
sock.bind(sockaddr)
OSError: [Errno 99] Cannot assign requested address

I’m at a loss as to what could be causing this to happen. I’ve never seen it with other Python apps we’ve hosted (including Dash apps).

I’d really appreciate some suggestions here.

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