Accessing Volumes in docker

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I want to access an external directory 'web-app' in my docker container.

Consider the directory structure below:

MyDcocker
   |-dockerFile
   |-web-app
        |-flask-web.py

I have the following lines in my dockerfile:

VOLUME ["web-app"]
# Run flask-web (API) file
CMD ["python3","web-app/flask-web.py"]

When running the image, I get the error:

python3: can't open file 'web-app/flask-web.py': [Errno 2] No such file or directory

I believe the directory has not been mounted properly. How do I solve this ?

docker-volume dockerfile docker
1 Answers

You will write in Dockerfile how you build the container, not how container will interact with your host.

For mount a directory from your host in your container, you have 2 solutions :

with docker command line : 

docker run -v $(pwd)/web-app:/var/lib/web-app/ dck-image-name

with docker-compose 

version: '2'
services:
  myservice:
    image: dck-image-name
    volumes:
      - ./web-app:/var/lib/web-app/
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