Flask is a lightweight WSGI web application framework in Python. This guide will walk you through deploying a Flask application on an Ubuntu VPS.
1. Update Your System
Ensure your system is up-to-date:
sudo apt-get update
sudo apt-get upgrade2. Install Required Packages
Install Python, pip, and virtualenv:
sudo apt-get install python3 python3-pip python3-venv3. Create a Project Directory
Create a directory for your Flask project:
mkdir ~/myflaskapp
cd ~/myflaskapp4. Set Up a Virtual Environment
Create and activate a virtual environment:
python3 -m venv venv
source venv/bin/activate5. Install Flask
Install Flask and any other dependencies within the virtual environment:
pip install Flask6. Create a Flask Application
Create a simple Flask application. Create a file named app.py:
nano app.pyAdd the following content to app.py:
from flask import Flask
app = Flask(__name__)
@app.route('/')
def home():
return 'Hello, Flask!'
if __name__ == '__main__':
app.run(host='0.0.0.0', port=5000)Save and close the file (press Ctrl+X, then Y, and Enter).
7. Test the Flask Application
Run your Flask application to make sure it works:
python app.pyOpen a web browser and navigate to http://your_server_ip:5000. You should see “Hello, Flask!” displayed.
8. Set Up Gunicorn
Install Gunicorn, a WSGI HTTP server for Python web applications:
pip install gunicornRun your Flask application with Gunicorn:
gunicorn --bind 0.0.0.0:8000 app:app9. Set Up Nginx
Install Nginx to act as a reverse proxy for Gunicorn:
sudo apt-get install nginxCreate a new Nginx configuration file for your Flask app:
sudo nano /etc/nginx/sites-available/myflaskappAdd the following configuration:
server {
listen 80;
server_name your_server_ip;
location / {
proxy_pass http://127.0.0.1:8000;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
}
}Enable the configuration and restart Nginx:
sudo ln -s /etc/nginx/sites-available/myflaskapp /etc/nginx/sites-enabled/
sudo service nginx restart10. Set Up a Systemd Service
Create a systemd service file to manage your Flask application:
sudo nano /etc/systemd/system/myflaskapp.serviceAdd the following content:
[Unit]
Description=Gunicorn instance to serve myflaskapp
After=network.target
[Service]
User=ubuntu
Group=www-data
WorkingDirectory=/home/ubuntu/myflaskapp
Environment="PATH=/home/ubuntu/myflaskapp/venv/bin"
ExecStart=/home/ubuntu/myflaskapp/venv/bin/gunicorn --workers 3 --bind 0.0.0.0:8000 app:app
[Install]
WantedBy=multi-user.targetStart and enable the service:
sudo systemctl start myflaskapp
sudo systemctl enable myflaskapp11. Troubleshooting
If you encounter issues, check the logs for Gunicorn, Nginx, and your systemd service:
sudo journalctl -u myflaskapp
sudo tail -f /var/log/nginx/error.log12. Further Configuration
For additional configuration and optimization, refer to the Flask and Gunicorn documentation, as well as Nginx and systemd manuals.
RDS CAL (Client Access License)
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