Error while building a docker image of a flask app - docker

Question

This is the flask app:
`From flask import Flask
app = Flask(__name__)
#app.route('/')
def hello_world():
return 'Flask Dockerized'
if __name__ == '__main__':
app.run(debug=True,host='0.0.0.0')`
This is the docker file:
FROM ubuntu:14.04
MAINTAINER Ashish John Stanley "a*********#gmail.com"
RUN apt-get update -y RUN apt-get install -y python-pip python-dev build-essential
COPY . /app WORKDIR /app RUN pip install -r requirements.txt
ENTRYPOINT ["python"]
CMD ["app.py"]
Command to build docker file:
docker build -t flask-container:latest. -f --file="~/Documents/web/requirements.txt"
The execution of the command gives the following error terminal screenshot

Answer 1

--file should be pointed to a directory that contains Dockerfile
Here is a command to create docker image for your case:
docker build -t flask-container:latest .
Make sure you are running it from the directory that contains Dockerfile
Docker documentation:
--file , -f Name of the Dockerfile (Default is ‘PATH/Dockerfile’)
By default the docker build command will look for a Dockerfile at the
root of the build context. The -f, --file, option lets you specify the
path to an alternative file to use instead. This is useful in cases
where the same set of files are used for multiple builds. The path
must be to a file within the build context. If a relative path is
specified then it is interpreted as relative to the root of the
context.
Here is more info about Docker options
https://docs.docker.com/engine/reference/commandline/build/#options.