Gunicorn命令行错误inGoogle应用引擎标准环境

Question

在将Flask/Python3/Postgres应用程序部署到应用程序引擎标准环境后，我收到了无穷无尽的以下错误。关于Psycopg2包的警告值得关注，但不是导致应用程序无法运行的原因。相反，这是GAE提供的GAE提供的无效命令行参数，而不是我提供的。有人能够成功地将使用Postgres的Python3 Flask部署到标准环境中吗？

以下是日志文件输出：

2018-12-11 02:51:37 +0000] [3738] [INFO] Booting worker with pid: 3738
2018-12-11 02:51:37 default[20181210t140744]  /env/lib/python3.7/site-packages/psycopg2/__init__.py:144: UserWarning: The psycopg2 wheel package will be renamed from release 2.8; in order to keep installing from binary please use "pip install psycopg2-binary" instead. For details see: <http://initd.org/psycopg/docs/install.html#binary-install-from-pypi>.
2018-12-11 02:51:37 default[20181210t140744]    """)
2018-12-11 02:51:38 default[20181210t211942]  usage: gunicorn [-h] [--debug] [--args]
2018-12-11 02:51:38 default[20181210t211942]  gunicorn: error: unrecognized arguments: main:app --workers 1 -c /config/gunicorn.py
2018-12-11 02:51:38 default[20181210t211942]  [2018-12-11 02:51:38 +0000] [882] [INFO] Worker exiting (pid: 882)

Answer 1

默认情况下，如果app.yaml中没有定义entrypoint，App Engine将在main.py中查找名为app的应用。如果您查看Github中的官方代码示例，它会在main.py文件中声明：

app = Flask(__name__)

或者，可以通过向指向另一个文件的app.yaml添加一个entrypoint来配置它。例如，如果在名为prod的文件中声明app：

entrypoint: gunicorn -b :$PORT prod.app

您将找到有关入口点配置here的其他详细信息。

Answer 2

从上面的评论和答案来看，问题看起来一定是我的应用程序出了问题。我确认了这一点，在一个简单的应用程序上本地运行gunicorn没有遇到困难，但在运行真正的应用程序时失败了。

其中一个罪魁祸首是使用argparse，我之所以使用argparse，是因为在本地工作时，我可以在命令行中添加"debug“参数。将该代码移到if __name__ == '__main__':部分，使应用程序在本地使用gunicorn时运行良好。

但它在部署到GAE时仍然会失败：

2018-12-12 20:09:16 default[20181212t094625]  [2018-12-12 20:09:16 +0000] [8145] [INFO] Booting worker with pid: 8145
2018-12-12 20:09:16 default[20181212t094625]  /env/lib/python3.7/site-packages/psycopg2/__init__.py:144: UserWarning: The psycopg2 wheel package will be renamed from release 2.8; in order to keep installing from binary please use "pip install psycopg2-binary" instead. For details see: <http://initd.org/psycopg/docs/install.html#binary-install-from-pypi>.
2018-12-12 20:09:16 default[20181212t094625]    """)
2018-12-12 20:09:16 default[20181212t094625]  [2018-12-12 20:09:16 +0000] [8286] [INFO] Booting worker with pid: 8286
2018-12-12 20:09:16 default[20181212t094625]  /env/lib/python3.7/site-packages/psycopg2/__init__.py:144: UserWarning: The psycopg2 wheel package will be renamed from release 2.8; in order to keep installing from binary please use "pip install psycopg2-binary" instead. For details see: <http://initd.org/psycopg/docs/install.html#binary-install-from-pypi>.
2018-12-12 20:09:16 default[20181212t094625]    """)
2018-12-12 20:09:19 default[20181212t094625]  usage: gunicorn [-h] [--debug] [--args]
2018-12-12 20:09:19 default[20181212t094625]  gunicorn: error: unrecognized arguments: -b :8081 main:app
2018-12-12 20:09:19 default[20181212t094625]  [2018-12-12 20:09:19 +0000] [8145] [INFO] Worker exiting (pid: 8145)

下面是app.yaml (去掉SendGrid的环境变量)：

runtime: python37
env: standard
#threadsafe: true
entrypoint: gunicorn --workers 2 --bind :5000 main:app

#runtime_config:
#  python_version: 3

# This beta setting is necessary for the db hostname parameter to be able to handle a URI in the
# form “/cloudsql/...” where ... is the instance given here:
beta_settings:
    cloud_sql_instances: provost-access-148820:us-east1:cuny-courses