设置新的 docker 映像然后尝试运行项目后，映像未运行

Question

I'm new to Docker and I'm trying to encapsulate my pytest python project into docker image, I've written the python code using pytest library in order to run the program.

I've created the 'requirement.txt' file for docker. This is how my 'dockerfile' looks like right now:

FROM python:3.8.3

ADD tests/test_class.py /

COPY requirements.txt ./

RUN pip install -r requirements.txt

But when I run the docker as following: docker run -it <image_id> py.test -s -v

It produces the following response:

platform linux -- Python 3.8.3, pytest-5.4.3, py-1.8.2, pluggy-0.13.1 -- /usr/local/bin/python
cachedir: .pytest_cache
metadata: {'Python': '3.8.3', 'Platform': 'Linux-4.19.76-linuxkit-x86_64-with-glibc2.2.5', 'Packages': {'pytest': '5.4.3', 'py': '1.8.2', 'pluggy': '0.13.1'}, 'Plugins': {'html': '2.1.1', 'metadata': '1.10.0'}}
rootdir: /
plugins: html-2.1.1, metadata-1.10.0
collecting ...

and it got stuck on the collecting... without running the test

when I go to the dashboard I notice that my image is not running

Answer 1

Use something like this:

FROM python:3.6

# Create app directory
WORKDIR /app

# Install app dependencies
COPY src/requirements.txt ./

RUN pip install -r requirements.txt

# Bundle app source
COPY src /app

EXPOSE 8080
CMD [ "python", "server.py" ]

Answer 2

In the folder with your Python project code, create a Dockerfile similar to this:

# Starting from Python 3 base image
FROM python:3

# Set the WORKDIR to /app so all following commands run in /app
WORKDIR /app

# Adding (dev-)requirements files before installing requirements
COPY requirements.txt dev-requirements.txt ./

# Install requirements and dev requirements through pip. Those should include
# nostest, pytest or any other test framework you use
RUN pip install -r requirements.txt -r dev-requirements.txt

# Adding the rest of your project code to the image
COPY . ./

Then, run your tests in the container like this:

docker run -it <image_id> pytest

Answer 3

First create a Dockerfile in the root directory as below

FROM python:3.6

# Create app directory
WORKDIR /app

# copy the requirements file to the working directory 
COPY requirements.txt ./

# then install the requirements before running the app
RUN pip install --no-cache-dir -r requirements.txt

# copy the rest of the file
COPY . /app

then build the image

docker build -t my-pytest . # here . indicates the path to your Dockerfile

Once this is done, take the image id:

docker images | grep my-pytest

then execute the command

docker run -it <IMAGE ID> py.test - s -v