错误：类 uri 'eventlet' 无效或未找到

Question

我一直在运行一个使用 Celery 运行任务的 dockerized Flask 应用程序。要运行该应用程序，我将 gunicorn 与 eventlet 一起使用，并且使用 alpine linux 发行版运行良好。

但是，由于 sklearn 和其他库的一些问题，我不得不转移到 ubuntu，现在我在运行我的应用程序时遇到了问题。

首先，我收到此错误：

Error: class uri 'eventlet' invalid or not found:

[Traceback (most recent call last):
  File "/myapp/env/lib/python3.6/site-packages/gunicorn/workers/geventlet.py", line 11, in <module>
    import eventlet
ModuleNotFoundError: No module named 'eventlet'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/myapp/env/lib/python3.6/site-packages/gunicorn/util.py", line 135, in load_class
    mod = import_module('.'.join(components))
  File "/usr/lib/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/myapp/env/lib/python3.6/site-packages/gunicorn/workers/geventlet.py", line 13, in <module>
    raise RuntimeError("You need eventlet installed to use this worker.")
RuntimeError: You need eventlet installed to use this worker.

然后我尝试添加pip install eventlet到我的应用程序的 Dockerfile 中，现在我遇到了另一个错误：

Error: class uri 'eventlet' invalid or not found:

[Traceback (most recent call last):
  File "/myapp/env/lib/python3.6/site-packages/gunicorn/util.py", line 135, in load_class
    mod = import_module('.'.join(components))
  File "/usr/lib/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/myapp/env/lib/python3.6/site-packages/gunicorn/workers/geventlet.py", line 11, in <module>
    import eventlet
  File "/myapp/env/lib/python3.6/site-packages/eventlet/__init__.py", line 10, in <module>
    from eventlet import convenience
  File "/myapp/env/lib/python3.6/site-packages/eventlet/convenience.py", line 7, in <module>
    from eventlet.green import socket
  File "/myapp/env/lib/python3.6/site-packages/eventlet/green/socket.py", line 21, in <module>
    from eventlet.support import greendns
  File "/myapp/env/lib/python3.6/site-packages/eventlet/support/greendns.py", line 69, in <module>
    setattr(dns.rdtypes.IN, pkg, import_patched('dns.rdtypes.IN.' + pkg))
  File "/myapp/env/lib/python3.6/site-packages/eventlet/support/greendns.py", line 59, in import_patched
    return patcher.import_patched(module_name, **modules)
  File "/myapp/env/lib/python3.6/site-packages/eventlet/patcher.py", line 126, in import_patched
    *additional_modules + tuple(kw_additional_modules.items()))
  File "/myapp/env/lib/python3.6/site-packages/eventlet/patcher.py", line 100, in inject
    module = __import__(module_name, {}, {}, module_name.split('.')[:-1])
  File "/myapp/env/lib/python3.6/site-packages/dns/rdtypes/IN/WKS.py", line 25, in <module>
    _proto_tcp = socket.getprotobyname('tcp')
OSError: protocol not found

这就是我启动我的应用程序 ( start.sh) 的方式：

gunicorn -w 1 --worker-class eventlet --certfile=myapp/myapp.crt --keyfile=myapp/myapp.key --bind 0.0.0.0:5000 --log-config myapp/gunicorn.conf myapp.run:app

在我搬到基于 ubuntu 的容器之前，它一直工作正常。

我在这里缺少什么？

我很感激任何帮助。

谢谢！

Answer 1

我遇到了同样的问题，我发现这是由eventlet他们删除eventlet.wsgi.ALREADY_HANDLED但gunicorn仍在使用它所做的一些更新引起的。所以，你最好降级eventlet版本。

pip install gunicorn==20.1.0 eventlet==0.30.2

这是参考 https://github.com/eventlet/eventlet/issues/702

Answer 2

我将发布我找到的解决方案，以防它对任何人有用。

只是我错过了/etc/protocols，这就是我修复它的方法：

我必须在我的 Dockerfile 中添加此步骤：

RUN apt-get -o Dpkg::Options::='--force-confmiss' install --reinstall -y netbase