CODEWITHSUNDEEP
pythondockerflaskpytorchjinja2
connor449
connor449

Reputation: 1679

Error trying to build docker for flask app

I'm trying to build a docker to run a flask app. I've never done this before. I have the flask app working locally. Here is my approach:

My directory structure for the project looks like this:

model.pkl  README.md          images/            static/
Dockerfile         flaskapp.py        requirements.txt   templates/

I can launch the flask app by running python flaskapp.py and it runs in my browser (locally).

I want to create a Docker so other machines can run this project without dealing with all the dependency stuff. To do so, I've done the following:

FROM python:3
COPY requirements.txt /tmp
COPY flaskapp.py /tmp
COPY model.pkl /tmp
COPY images /tmp
COPY static /tmp
COPY templates /tmp
WORKDIR /tmp
ADD flaskapp.py /
RUN pip install -r requirements.txt
CMD [ "python", "flaskapp.py" ]

This site can’t be reached0.0.0.0 refused to connect.
Try:

Checking the connection
Checking the proxy and the firewall
ERR_CONNECTION_REFUSED

So I did some digging and I updated my Dockerfile to this (adding the last line):

FROM python:3
COPY requirements.txt /tmp
COPY flaskapp.py /tmp
COPY model.pkl /tmp
COPY images /tmp
COPY static /tmp
COPY templates /tmp
WORKDIR /tmp
ADD flaskapp.py /
RUN pip install -r requirements.txt
CMD [ "python", "flaskapp.py" ]
CMD ["flask", "run", "--host", "0.0.0.0" ]

Usage: flask run [OPTIONS]

Error: Could not locate Flask application. You did not provide the FLASK_APP environment variable.

For more information see http://flask.pocoo.org/docs/latest/quickstart/

How should I proceed?

If its relevant, my flaskapp.py looks like this:

model = load_learner('', 'model.pkl')

app = Flask(__name__)
app.config['SEND_FILE_MAX_AGE_DEFAULT'] = 0

def classify(document):
    X = document
    y = model.predict(X)
   
    return y

class ReviewForm(Form):
    pred = TextAreaField('',[validators.DataRequired(),validators.length(min=1)])

@app.route('/')
def index():
    form = ReviewForm(request.form)
    return render_template('reviewform.html', form=form)

@app.route('/results', methods=['POST'])
def results():
    form = ReviewForm(request.form)
    if request.method == 'POST' and form.validate():
        sequence = request.form['pred']
        y = classify(sequence)
        return render_template('results.html',
        y = y)
    return render_template('reviewform.html', form=form)

if __name__ == '__main__':
    app.run(host= '0.0.0.0')

EDIT 1

Now I am getting this error:

[2020-07-03 00:29:51,222] ERROR in app: Exception on / [GET]
Traceback (most recent call last):
  File "/usr/local/lib/python3.8/site-packages/flask/app.py", line 1988, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python3.8/site-packages/flask/app.py", line 1641, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/lib/python3.8/site-packages/flask/app.py", line 1544, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/python3.8/site-packages/flask/_compat.py", line 33, in reraise
    raise value
  File "/usr/local/lib/python3.8/site-packages/flask/app.py", line 1639, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib/python3.8/site-packages/flask/app.py", line 1625, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "flaskapp.py", line 94, in index
    return render_template('reviewform.html', form=form)
  File "/usr/local/lib/python3.8/site-packages/flask/templating.py", line 133, in render_template
    return _render(ctx.app.jinja_env.get_or_select_template(template_name_or_list),
  File "/usr/local/lib/python3.8/site-packages/jinja2/environment.py", line 930, in get_or_select_template
    return self.get_template(template_name_or_list, parent, globals)
  File "/usr/local/lib/python3.8/site-packages/jinja2/environment.py", line 883, in get_template
    return self._load_template(name, self.make_globals(globals))
  File "/usr/local/lib/python3.8/site-packages/jinja2/environment.py", line 857, in _load_template
    template = self.loader.load(self, name, globals)
  File "/usr/local/lib/python3.8/site-packages/jinja2/loaders.py", line 115, in load
    source, filename, uptodate = self.get_source(environment, name)
  File "/usr/local/lib/python3.8/site-packages/flask/templating.py", line 57, in get_source
    return self._get_source_fast(environment, template)
  File "/usr/local/lib/python3.8/site-packages/flask/templating.py", line 85, in _get_source_fast
    raise TemplateNotFound(template)
jinja2.exceptions.TemplateNotFound: reviewform.html

Upvotes: 1

Views: 1092

Answers (2)

Adiii
Adiii

Reputation: 59896

You can have only CMD per Dockerfile. so one will likely be ignored.

CMD [ "python", "flaskapp.py" ]
CMD ["flask", "run", "--host", "0.0.0.0" ]

Just remove the second one as you already listening to all interfaces in the code.

CMD [ "python", "flaskapp.py" ]

Now run the Docker container with this command.

docker run -p 5000:5000 -it python-barcode

And then you will able to hit endpoint

htpp://localhost:5000

Upvotes: 1

Joran Beasley
Joran Beasley

Reputation: 113930

you need to expose the port to the external world

docker run -p 8000:8000 python-barcode this maps port 8000 inside the docker container to port 8000 outside the docker container.

then you can go to http://127.0.0.1:8000 on the host computer

you could also redirect the port to a different port

docker run -p 8000:9000 python-barcode and then access it at http://127.0.0.1:9000 on the host system

Upvotes: 0

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