Here is my Dockerfile:
# base image
FROM python:3.7.2-alpine
# set working directory
WORKDIR /usr/src/app
# add and install requirements
COPY ./requirements.txt /usr/src/app/requirements.txt
RUN pip install -r requirements.txt
# add app
COPY . /usr/src/app
# run server
CMD ["python", "manage.py", "run"]
This is my manage.py file:
from flask.cli import FlaskGroup
from project import app
cli = FlaskGroup(app)
# run and manage the app from the command line
if __name__ == '__main__':
cli()
When I ran "docker-compose up", everything is good but this:
Starting app_users_1 ... done
Attaching to app_users_1
users_1 | * Serving Flask app "project/__init__.py" (lazy loading)
users_1 | * Environment: development
users_1 | * Debug mode: on
users_1 | * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
users_1 | * Restarting with stat
users_1 | Traceback (most recent call last):
users_1 | File "manage.py", line 8, in <module>
users_1 | cli()
users_1 | File "/usr/local/lib/python3.7/site-packages/click/core.py", line 764, in __call__
users_1 | return self.main(*args, **kwargs)
users_1 | File "/usr/local/lib/python3.7/site-packages/flask/cli.py", line 569, in main
users_1 | return super(FlaskGroup, self).main(*args, **kwargs)
users_1 | File "/usr/local/lib/python3.7/site-packages/click/core.py", line 717, in main
users_1 | rv = self.invoke(ctx)
users_1 | File "/usr/local/lib/python3.7/site-packages/click/core.py", line 1137, in invoke
users_1 | return _process_result(sub_ctx.command.invoke(sub_ctx))
users_1 | File "/usr/local/lib/python3.7/site-packages/click/core.py", line 956, in invoke
users_1 | return ctx.invoke(self.callback, **ctx.params)
users_1 | File "/usr/local/lib/python3.7/site-packages/click/core.py", line 555, in invoke
users_1 | return callback(*args, **kwargs)
users_1 | File "/usr/local/lib/python3.7/site-packages/click/decorators.py", line 64, in new_func
users_1 | return ctx.invoke(f, obj, *args, **kwargs)
users_1 | File "/usr/local/lib/python3.7/site-packages/click/core.py", line 555, in invoke
users_1 | return callback(*args, **kwargs)
users_1 | File "/usr/local/lib/python3.7/site-packages/flask/cli.py", line 783, in run_command
users_1 | threaded=with_threads, ssl_context=cert)
users_1 | File "/usr/local/lib/python3.7/site-packages/werkzeug/serving.py", line 1007, in run_simple
users_1 | run_with_reloader(inner, extra_files, reloader_interval, reloader_type)
users_1 | File "/usr/local/lib/python3.7/site-packages/werkzeug/_reloader.py", line 332, in run_with_reloader
users_1 | sys.exit(reloader.restart_with_reloader())
users_1 | File "/usr/local/lib/python3.7/site-packages/werkzeug/_reloader.py", line 176, in restart_with_reloader
users_1 | exit_code = subprocess.call(args, env=new_environ, close_fds=False)
users_1 | File "/usr/local/lib/python3.7/subprocess.py", line 323, in call
users_1 | with Popen(*popenargs, **kwargs) as p:
users_1 | File "/usr/local/lib/python3.7/subprocess.py", line 775, in __init__
users_1 | restore_signals, start_new_session)
users_1 | File "/usr/local/lib/python3.7/subprocess.py", line 1522, in _execute_child
users_1 | raise child_exception_type(errno_num, err_msg, err_filename)
users_1 | OSError: [Errno 8] Exec format error: '/usr/src/app/manage.py'
app_users_1 exited with code 1
It seems the the last step (CMD) from the Dockerfile failed. In my local machine, the flask application can be run without any problem. I have no idea why it failed in the "flask.cli" module. It seems it didn't take the "run" argument?
Please help!
The problem you are facing is actually contained in the last line of your stacktrace. I'll try to first shed some light into the error, then give you a solution:
Meaning of error:
OSError: an error related to your operating system (i.e. windows) occurred.Exec format error: '/usr/src/app/manage.py': specifically, the system cannot execute the manage.py file, most probably due to a missing shebang at the top of the file.Possible solution:
Add a shebang at the beginning of the file, possibly using the full path of your python executable.
Other related questions: