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Data Science Web Scaffold

A scaffold for deploying dockerized flask applications.

If you have any questions, feel free to open an issue on Github.

Video Guide

Deploy a Web Project with Flask

This guide covers how you can quickly deploy most projects with the Flask framework and our omni scaffold.

Quickstart Guide for Local Development

cd into the /app folder

python3 -m pip install -r requirements.txt

edit line 29 the main.py file to either the URL of the cocalc server you are on or localhost if you are running it on your own PC

run

python3 -m main

to start the server on local, most changes while developing will be picked up in realtime by the server

Quickstart Guide for Local Deployment

Make sure docker is installed on your system. Look that up if you don't know what that means.

cd into the root director of the repo then run

docker build -t omni .

once built, run

docker run -d -p 9000:80 --restart=unless-stopped --name omni omni

you should then be able to see the omni container running when you run

docker ps -a

if it seems to be stuck (i.e. constantly listed as Restarting), something is wrong with the docker image or code inside causing it to repeatedly fail.

you can start debugging the project by running

docker logs -f omni

or

docker exec -it omni /bin/bash for an interactive bash terminal (this option only works if the container is running and not stuck in a restart loop)

Common Issues

$'\r': command not found when attempting to start docker container

this is caused by the the entrypoint.sh script somehow having CLRF line endings instead of LF line endings.

to fix this run

sed -i 's/\r$//' entrypoint.sh

File Structure

The files/directories which you will need to edit are bolded

DO NOT TOUCH OTHER FILES. THIS MAY RESULT IN YOUR PROJECT BEING UNABLE TO RUN

  • .gitignore
  • config.py
  • Dockerfile
  • READMD.md
  • entrypoint.sh
  • nginx_host
  • host_config
  • app/
    • main.py
    • requirements.txt
    • utils.py
    • templates/
      • index.html
    • static/
      • css/
        • styles.css
      • images/
        • GDP_correlation_map.png
      • js/
        • scripts.js

main.py

Contains the main flask app itself.

requirements.txt

Contains list of packages and modules required to run the flask app. Edit only if you are using additional packages that need to be pip installed in order to run the project.

To generate a requirements.txt file you can run

pip list --format=freeze > app/requirements.txt

the requirements.txt file will then be updated. Keep in mind: some packages you install on one operating system may not be available on another. You will have to debug and resolve this yourself if this is the case.

static/

Contains the static images, CSS, & JS files used by the flask app for the webpage. You will need to create this and put files in it. Place all your images used for your website in static/images/ so that you can then reference them in your html files. You can also place your css files in this folder, to reference them like static/css/styles.css

utils.py

Contains common functions used by the flask app. Put things here that are used more than once in the flask app.

templates/

Contains the HTML pages used for the webpage. Edit these to fit your project. index.html is the demo page. Optionally, you can add another team.html page or include a team section in index.html.

Files used for deployment

config.py Dockerfile entrypoint.sh nginx_host host_config Only modify host_config. Do not touch the other files.