How do I figure out what dependencies to install when I copy my Django app from one system to another?

Question

I'm using Django and Python 3.7. I want to write a script to help me easily migrate my application from my local machien (a Mac High Sierra) to a CentOS Linux instance. I'm using a virtual environment in both places. There are many things that need to be done here, but to keep the question specific, how do I determine on my remote machine (where I'm deploying my project to), what dependencies are lacking? I'm using rsync to copy the files (minus the virtual environment)

Answer 1

On the source system execute pip freeze > requirements.txt , then copy the requiremnts.txt to the target system and then on the target system install all the dependencies with pip install -r requirements.txt . Of course you will need to activate the virtual environments on both systems before execute the pip commands.

If you are using a source code management system like git it is a good idea to keep the requirements.txt up to date in your source code repository.