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pythondockerdockerfilesetuptools
llevar
llevar

Reputation: 785

Prevent Docker from installing python package requirements on every build (without requirements.txt)

I'm building an image from a Dockerfile where my main program is a python application that has a number of dependencies. The application is installed via setup.py and the dependencies are listed inside. There is no requirements.txt. I'm wondering if there is a way to avoid having to download and build all of the application dependencies, which rarely change, on every image build. I saw a number of solutions that use the requirements.txt file but I'd like to avoid having one if possible.

Upvotes: 1

Views: 334

Answers (2)

emcas88
emcas88

Reputation: 901

One solution is: if those dependencies rarely change as you said what you could do is another image with already those packages installed. You would create that image and then save it using docker save, so you end with a new base image with the required dependencies. docker save will create a .tar with the image. You have to load the image using docker load and then in your Dockerfile you would do:

FROM <new image with all the dependencies>
//your stuff and no need to run pip install
....

Hope it helps

Docker save description

Upvotes: 0

hoefling
hoefling

Reputation: 66311

You can use requires.txt from the egg info to preinstall the requirements.

WORKDIR path/to/setup/script
RUN python setup.py egg_info
RUN pip install -r pkgname.egg-info/requires.txt

Upvotes: 2

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