Does the default template not compatible with langgraph dockerfile built image?

[gsgh3016]

I made the default template as below:

$ uvx --from "langgraph-cli[inmem]" langgraph new
// (chose New LangGraph Project and Python)
$ uv run langgraph dockerfile Dockerfile
// also tried: langgraph dockerfile Dockerfile
$ docker build -f Dockerfile -t langgraph-practice .
$ docker run langgraph-practice

Then, this error occurred:

Traceback (most recent call last):
  File "/usr/bin/uvicorn", line 10, in <module>
    sys.exit(main())
             ^^^^^^
  File "/usr/lib/python3.11/site-packages/click/core.py", line 1442, in __call__
    return self.main(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/click/core.py", line 1363, in main
    rv = self.invoke(ctx)
         ^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/click/core.py", line 1226, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/click/core.py", line 794, in invoke
    return callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/uvicorn/main.py", line 413, in main
    run(
  File "/usr/lib/python3.11/site-packages/uvicorn/main.py", line 580, in run
    server.run()
  File "/usr/lib/python3.11/site-packages/uvicorn/server.py", line 66, in run
    return asyncio.run(self.serve(sockets=sockets))
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/asyncio/runners.py", line 190, in run
    return runner.run(main)
           ^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/asyncio/runners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "uvloop/loop.pyx", line 1518, in uvloop.loop.Loop.run_until_complete
  File "/usr/lib/python3.11/site-packages/uvicorn/server.py", line 70, in serve
    await self._serve(sockets)
  File "/usr/lib/python3.11/site-packages/uvicorn/server.py", line 77, in _serve
    config.load()
  File "/usr/lib/python3.11/site-packages/uvicorn/config.py", line 435, in load
    self.loaded_app = import_from_string(self.app)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/uvicorn/importer.py", line 19, in import_from_string
    module = importlib.import_module(module_str)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap>", line 1204, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1176, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1147, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 690, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 940, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/api/langgraph_api/server.py", line 32, in <module>
  File "/api/langgraph_api/config.py", line 149, in <module>
  File "/usr/lib/python3.11/site-packages/starlette/config.py", line 91, in __call__
    return self.get(key, cast, default)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/starlette/config.py", line 108, in get
    raise KeyError(f"Config '{key}' is missing, and has no default.")
KeyError: "Config 'DATABASE_URI' is missing, and has no default."

Does any configuration support the compatibility with database as default?
Or is there any documentation for this database configuration?
I cannot find any info about configuration. I think it needs the explanation to configurate DB connection.

[hinthornw]

Yes it is compatible. You have to provide the database uri. The database runs in a separate container.

I'd recommend using docker compose to spin up the Postgres and redis containers all at once.

The docs explain the architecture of LangGraph platform .

[gsgh3016]

I got it. Any plan to add default environment variables in .env.sample? To add sample variable template in .env.sample might be good guide to LangGraph newbies :)