testcontainers / testcontainers/testcontainers-python

Bug: `docker.errors.DockerException: Error while fetching server API version: maximum recursion depth exceeded` since upgrade of 4.15

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Mô tả

Describe the bug

It seems there is a regression after upgrading from 4.14.2 to 4.15

I was able to reproduce locally (podman) and on Kubernetes (via kubedock) and DOCKER_HOST='tcp://localhost:2475'

To Reproduce

def test_containers():
    with PostgresContainer(
        "<custom_domain>/postgres:16.4"
    ) as postgres:
        engine = sqlalchemy.create_engine(postgres.get_connection_url())
        with engine.begin() as connection:
            result = connection.execute(sqlalchemy.text("select version()"))
            (version,) = result.fetchone()
            client = TestClient(app)
            response = client.get("/api/todos/1")
            assert response.status_code == 200
            assert response.json() == {"completed": False, "id": 1, "title": "Todo 1"}
            response = client.get("/api/todos")
            assert response.status_code == 200

FAILED app/test_main.py::test_containers - docker.errors.DockerException: Error while fetching server API version: maximum recursion depth exceeded

Runtime environment

WSL podman but same behavior on kubedock (Docker API for K8S)

# Get the operating system information (on a unix os).
$ uname -a
 6.18.33.2-microsoft-standard-WSL2 #1
# Get the python version.
$ python --version
Python 3.14.5
# Get the docker version and other docker information.
$ docker info
version:
  APIVersion: 4.9.3
  Built: 0
  BuiltTime: Thu Jan  1 01:00:00 1970
  GitCommit: ""
  GoVersion: go1.22.2
  Os: linux
  OsArch: linux/amd64
  Version: 4.9.3
# Get all python packages.
$ pip freeze
annotated-doc==0.0.4
annotated-types==0.7.0
anyio==4.14.1
babel==2.18.0
backrefs==7.0
beautifulsoup4==4.12.3
certifi==2026.6.17
cfgv==3.5.0
charset-normalizer==3.4.9
click==8.4.1
colorama==0.4.6
coverage==7.15.0
dacite==1.9.2
defusedxml==0.7.1
distlib==0.4.3
docker==7.1.0
fastapi==0.139.2
filelock==3.29.7
ghp-import==2.1.0
gitdb==4.0.12
GitPython==3.1.50
greenlet==3.5.3
h11==0.16.0
httpcore==1.0.9
httpie==3.2.4
httpx==0.28.1
identify==2.6.19
idna==3.18
iniconfig==2.3.0
Jinja2==3.1.6
Markdown==3.10.2
markdown-it-py==4.2.0
markdown_graphviz_inline==1.1.3
MarkupSafe==3.0.3
mdurl==0.1.2
mdx-truly-sane-lists==1.3
mergedeep==1.3.4
mkdocs==1.6.1
mkdocs-autorefs==1.4.4
mkdocs-get-deps==0.2.2
mkdocs-git-latest-changes-plugin==0.0.23
mkdocs-github-admonitions-plugin==0.1.1
mkdocs-include-dir-to-nav==1.2.0
mkdocs-inline-svg-plugin==0.1.5
mkdocs-kroki-plugin==1.6.0
mkdocs-material==9.7.6
mkdocs-material-extensions==1.3.1
mkdocs-monorepo-plugin==1.1.2
mkdocs-multirepo-plugin==0.8.3
mkdocs-nav-weight==0.3.0
mkdocs-redirects==1.2.3
mkdocs-same-dir==0.1.5
mkdocs-techdocs-core==1.7.0
mkdocstrings==1.0.4
multidict==6.7.1
mypy_extensions==1.1.0
nodeenv==1.10.0
packaging==26.2
paginate==0.5.7
pathspec==1.1.1
plantuml-markdown==3.11.2
platformdirs==4.10.0
pluggy==1.6.0
pre_commit==4.6.1
properdocs==1.6.7
psycopg2-binary==2.9.12
pydantic==2.13.4
pydantic_core==2.46.4
Pygments==2.20.0
pymdown-extensions==10.21.3
PySocks==1.7.1
pytest==9.1.1
pytest-cov==7.1.0
python-dateutil==2.9.0.post0
python-discovery==1.4.3
python-dotenv==1.2.2
python-slugify==8.0.4
PyYAML==6.0.3
pyyaml_env_tag==1.1
requests==2.31.0
requests-toolbelt==1.0.0
result==0.17.0
rich==15.0.0
setuptools==83.0.0
six==1.17.0
smmap==5.0.3
soupsieve==2.8.4
SQLAlchemy==2.0.51
starlette==1.3.1
testcontainers==4.15.0
text-unidecode==1.3
typing-inspect==0.8.0
typing-inspection==0.4.2
typing_extensions==4.16.0
urllib3==2.7.0
uvicorn==0.51.0
virtualenv==21.6.0
watchdog==6.0.0
wrapt==2.2.2

On 4.14.2 no issue on both environment

On CI I was able to capture this stacktrace

[05:43:48.711+02:00] - ../../../.local/lib/python3.14/site-packages/testcontainers/core/container.py:501: in _create_instance
[05:43:48.711+02:00] -     .start()
[05:43:48.711+02:00] -      ^^^^^^^
[05:43:48.711+02:00] - ../../../.local/lib/python3.14/site-packages/testcontainers/core/container.py:247: in start
[05:43:48.711+02:00] -     Reaper.get_instance()
[05:43:48.711+02:00] - ../../../.local/lib/python3.14/site-packages/testcontainers/core/container.py:472: in get_instance
[05:43:48.711+02:00] -     Reaper._instance = Reaper._create_instance()
[05:43:48.711+02:00] -                        ^^^^^^^^^^^^^^^^^^^^^^^^^
[05:43:48.711+02:00] - ../../../.local/lib/python3.14/site-packages/testcontainers/core/container.py:501: in _create_instance
[05:43:48.711+02:00] -     .start()
[05:43:48.711+02:00] -      ^^^^^^^
[05:43:48.711+02:00] - ../../../.local/lib/python3.14/site-packages/testcontainers/core/container.py:247: in start
[05:43:48.711+02:00] -     Reaper.get_instance()
[05:43:48.711+02:00] - ../../../.local/lib/python3.14/site-packages/testcontainers/core/container.py:472: in get_instance
[05:43:48.711+02:00] -     Reaper._instance = Reaper._create_instance()
[05:43:48.711+02:00] -                        ^^^^^^^^^^^^^^^^^^^^^^^^^
[05:43:48.711+02:00] - ../../../.local/lib/python3.14/site-packages/testcontainers/core/container.py:501: in _create_instance
[05:43:48.711+02:00] -     .start()
[05:43:48.711+02:00] -      ^^^^^^^
[05:43:48.711+02:00] - ../../../.local/lib/python3.14/site-packages/testcontainers/core/container.py:247: in start
[05:43:48.711+02:00] -     Reaper.get_instance()
[05:43:48.711+02:00] - ../../../.local/lib/python3.14/site-packages/testcontainers/core/container.py:472: in get_instance
[05:43:48.711+02:00] -     Reaper._instance = Reaper._create_instance()
[05:43:48.711+02:00] -                        ^^^^^^^^^^^^^^^^^^^^^^^^^
[05:43:48.711+02:00] - ../../../.local/lib/python3.14/site-packages/testcontainers/core/container.py:501: in _create_instance
[05:43:48.711+02:00] -     .start()
[05:43:48.711+02:00] -      ^^^^^^^
[05:43:48.711+02:00] - ../../../.local/lib/python3.14/site-packages/testcontainers/core/container.py:247: in start
[05:43:48.711+02:00] -     Reaper.get_instance()
[05:43:48.711+02:00] - ../../../.local/lib/python3.14/site-packages/testcontainers/core/container.py:472: in get_instance
[05:43:48.711+02:00] -     Reaper._instance = Reaper._create_instance()
[05:43:48.711+02:00] -                        ^^^^^^^^^^^^^^^^^^^^^^^^^
[05:43:48.711+02:00] - ../../../.local/lib/python3.14/site-packages/testcontainers/core/container.py:501: in _create_instance
[05:43:48.711+02:00] -     .start()
[05:43:48.711+02:00] -      ^^^^^^^
[05:43:48.711+02:00] - ../../../.local/lib/python3.14/site-packages/testcontainers/core/container.py:247: in start
[05:43:48.711+02:00] -     Reaper.get_instance()
[05:43:48.711+02:00] - ../../../.local/lib/python3.14/site-packages/testcontainers/core/container.py:472: in get_instance
[05:43:48.711+02:00] -     Reaper._instance = Reaper._create_instance()
[05:43:48.711+02:00] -                        ^^^^^^^^^^^^^^^^^^^^^^^^^
[05:43:48.711+02:00] - ../../../.local/lib/python3.14/site-packages/testcontainers/core/container.py:501: in _create_instance
[05:43:48.711+02:00] -     .start()
[05:43:48.711+02:00] -      ^^^^^^^
[05:43:48.711+02:00] - ../../../.local/lib/python3.14/site-packages/testcontainers/core/container.py:247: in start
[05:43:48.711+02:00] -     Reaper.get_instance()
[05:43:48.711+02:00] - ../../../.local/lib/python3.14/site-packages/testcontainers/core/container.py:472: in get_instance
[05:43:48.711+02:00] -     Reaper._instance = Reaper._create_instance()
[05:43:48.711+02:00] -                        ^^^^^^^^^^^^^^^^^^^^^^^^^
[05:43:48.711+02:00] - ../../../.local/lib/python3.14/site-packages/testcontainers/core/container.py:495: in _create_instance
[05:43:48.711+02:00] -     DockerContainer(c.ryuk_image)
[05:43:48.711+02:00] - ../../../.local/lib/python3.14/site-packages/testcontainers/core/container.py:129: in __init__
[05:43:48.711+02:00] -     self._docker = DockerClient(**(docker_client_kw or {}))
[05:43:48.711+02:00] -                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[05:43:48.711+02:00] - ../../../.local/lib/python3.14/site-packages/testcontainers/core/docker_client.py:194: in __init__
[05:43:48.712+02:00] -     self.client = docker.from_env(**kwargs)
[05:43:48.712+02:00] -                   ^^^^^^^^^^^^^^^^^^^^^^^^^
[05:43:48.712+02:00] - ../../../.local/lib/python3.14/site-packages/docker/client.py:110: in from_env
[05:43:48.712+02:00] -     return cls(
[05:43:48.712+02:00] - ../../../.local/lib/python3.14/site-packages/docker/client.py:48: in __init__
[05:43:48.712+02:00] -     self.api = APIClient(*args, **kwargs)
[05:43:48.712+02:00] -                ^^^^^^^^^^^^^^^^^^^^^^^^^^
[05:43:48.712+02:00] - ../../../.local/lib/python3.14/site-packages/docker/api/client.py:207: in __init__
[05:43:48.712+02:00] -     self._version = self._retrieve_server_version()
[05:43:48.712+02:00] -                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[05:43:48.712+02:00] - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
[05:43:48.712+02:00] - 
[05:43:48.712+02:00] - self = <docker.api.client.APIClient object at 0x7f97b2161650>
[05:43:48.712+02:00] - 
[05:43:48.712+02:00] -     def _retrieve_server_version(self):
[05:43:48.712+02:00] -         try:
[05:43:48.712+02:00] -             return self.version(api_version=False)["ApiVersion"]
[05:43:48.712+02:00] -         except KeyError as ke:
[05:43:48.712+02:00] -             raise DockerException(
[05:43:48.712+02:00] -                 'Invalid response from docker daemon: key "ApiVersion"'
[05:43:48.712+02:00] -                 ' is missing.'
[05:43:48.712+02:00] -             ) from ke
[05:43:48.712+02:00] -         except Exception as e:
[05:43:48.712+02:00] - >           raise DockerException(
[05:43:48.712+02:00] -                 f'Error while fetching server API version: {e}'
[05:43:48.712+02:00] -             ) from e
[05:43:48.712+02:00] - E           docker.errors.DockerException: Error while fetching server API version: maximum recursion depth exceeded
[05:43:48.712+02:00] - 
[05:43:48.712+02:00] - ../../../.local/lib/python3.14/site-packages/docker/api/client.py:230: DockerException

Reaper._create_instance() seems to be called forever

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Bắt đầu từ đâu

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  2. Bình luận trên issue rằng bạn sẽ nhận — tránh hai người làm cùng một việc.
  3. Fork repository và làm thay đổi trên một nhánh.
  4. Mở pull request có tham chiếu số hiệu của issue.

Hướng nghiên cứu

Trước tiên, kiểm tra testcontainers/core/container.py tại Reaper.get_instance(), _create_instance() và DockerContainer.init, sau đó theo dõi quá trình khởi tạo DockerClient đến _retrieve_server_version trong docker/api/client.py được hiển thị trong trace. Tái hiện vấn đề bằng ví dụ test_containers được cung cấp và DOCKER_HOST; hoàn thành khi đường dẫn 4.15 không còn đệ quy và regression được bao phủ.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.

Đánh giá

Công nghệ
docker, python
Lĩnh vực
testing
Loại issue
Lỗi
Độ khó
3/5
Thời gian dự kiến
1-2 ngày
Mức độ hoạt động
Ít trao đổi
Độ rõ ràng
Khá rõ ràng
Mức phù hợp với người mới
58/100

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