Marcs Notes

Nginx Gunicorn Flask

2 min read

Nginx Gunicorn Flask

sudo apt update 
sudo apt upgrade
 
sudo apt install nginx
sudo nginx
sudo adduser test

Remove user

sudo deluser --remove-home ubuntu

Create Flask app

Create the flask app with the test user.

wget "https://repo.anaconda.com/miniconda/Miniconda3-py310_23.3.1-0-Linux-x86_64.sh"
bash Miniconda3-latest-Linux-x86_64.sh

or use Python Virtual Environments: A Primer – Real Python

conda create -n "test" python=3.10 pip
pip install flask gunicorn

Create a wsgi.py file

# first is filename, second is app name in file
from app import app
 
if __name__ == "__main__":
        app.run()

Create Flask Service

nano /etc/systemd/system/flaskapp.service

Add to the file:

[Unit]
Description=Guincorn serving flask app 
# only start service when there is a network connection 
After=network.target    
 
[Service]
User=<user>
Group=www-data
WorkingDirectory=/home/<user>/<cwd>
Environment="PATH=/home/<user>/miniconda3/envs/<env>/bin"
# start gunicorn server with 3 workers that handle icoming requests 
# bind to unix socket (inter process communitcation)
# wsgi:app (module:app-instance)
ExecStart=/home/<user>/miniconda3/envs/<env>/bin/gunicorn --workers 3 --bind unix:<service>.sock -m 007 wsgi:app
 
[Install]
WantedBy=multi-user.target

Enable (service will start after system start) and start the service for the current session.

sudo systemctl enable flaskapp.service
sudo systemctl start flaskapp.service

When changing flask app restart service.

sudo systemctl restart flaskapp.service

Nginx Config

Comment out default config in

nano /etc/nginx/sites-available/default

Add new server config in

nano /etc/nginx/sites-available/app.conf

Content

server {
        listen 80;
        server_name test.marc-julian.de;
 
		# all requests on /api will be forwarded to the flaskapp unix socket where gunicorn will see them and forward to flask
        location /api {
                include proxy_params;
                proxy_pass http://unix:/home/test/flaskapp/flaskapp.sock;
        }
 
		# all other requests on root will be served by the /data/www directory 
        location / {
                root /data/www;
        }
 
		# all /images requests will be served by the /images directory
        location /images {      
                root /images;   
        }
}

This file is automatically included in the nginx.conf file. Only need to sym-link it to the sites-enabled directory.

sudo ln -s /etc/nginx/sites-available/app.conf /etc/nginx/sites-enabled/app.conf

Node

GitHub - nvm-sh/nvm: Node Version Manager - POSIX-compliant bash script to manage multiple active node.js versions use newest script

wget -qO- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.3/install.sh | bash

nvm install node
exit

Memory

free -M

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