DistributionNotFound when running pserve with docker-compose

Question

I'm trying to run my simple Pyramid application with docker-compose, below are my docker files:

Dockerfile:

FROM python:2.7-onbuild
RUN pip install --no-cache-dir -r requirements_dev.txt

docker-compose.yml

db:
  image: mysql:5.6

web:
  build: .
  command: pserve development.ini --reload
  volumes:
    - .:/usr/src/app
  ports:
    - "6543:6543"
  links:
    - db:db

When I run docker-compose up I get pkg_resources.DistributionNotFound: The 'tenders' distribution was not found and is required by the application, which is weird, because my application should have been installed using by pip install -e . command.

Things are getting weirder:

docker-compose run web bash
root@2323b6b2f3ca:/tenders# pip freeze | grep tenders  # no results
root@2323b6b2f3ca:/tenders# pip install -e .
Obtaining file:///tenders
# Skippping most of the outup for more readability
Installing collected packages: tenders
  Running setup.py develop for tenders
Successfully installed tenders
root@2323b6b2f3ca:/tenders# pip freeze | grep tenders
-e [email protected]:xxx/tenders.git@342a8f9101a3e06fa04d71f4eef81b461476d3a5#egg=tenders-master

Now when I launch pserve development.ini --reload it works just fine.

What am I doing wrong, how can I install my package tenders automatically using pip install -e . (or any other command)?

Answer 1

Update:

In the volumes section of the service, you can tell Docker to use the .egg-info folder from the container instead of from your host mounted volume.

For example, see /usr/src/app/yourapp.egg-info in that config:

web:
  build: .
  command: pserve development.ini --reload
  volumes:
    - .:/usr/src/app:cached
    - /usr/src/app/yourapp.egg-info
  ports:
    - "6543:6543"
  links:
    - db:db

Previous answer:

I had the same problem. It happens when the docker volume is mounted.

In your Dockerfile, you install the application with pip install -e ., which creates the .egg-info directory in the current directory (in the image). But later, when you use the docker volumes to replace the container source directory with yours, you don't have this .egg-info directory in your host filesystem.

The way I fixed it is that I created a virtualenv in my host filesystem, I ran python setup.py develop, but I guess you could run pip install -e .. It created the .egg-info directory so that it exists when you run pserve from the container. The virtualenv could probably be deleted at that point.

I'm really not sure it's the best solution, but at least, now you know the cause of the problem.