CodeToLive

Flask Application Deployment

Deploying your Flask application to production requires careful consideration of performance, security, and scalability.

Production WSGI Server


# Install Gunicorn
pip install gunicorn

# Run with Gunicorn
gunicorn -w 4 -b 0.0.0.0:8000 wsgi:app

Deployment to Heroku


# Create a Procfile
echo "web: gunicorn -w 4 -b 0.0.0.0:$PORT wsgi:app" > Procfile

# Create requirements.txt
pip freeze > requirements.txt

# Create runtime.txt (optional)
echo "python-3.9.7" > runtime.txt

# Deploy to Heroku
heroku login
heroku create
git push heroku main
heroku open

Deployment to AWS Elastic Beanstalk


# Install EB CLI
pip install awsebcli

# Initialize EB
eb init -p python-3.8 flask-app
eb create flask-env
eb open

Docker Deployment


# Dockerfile
FROM python:3.9-slim

WORKDIR /app
COPY . /app

RUN pip install -r requirements.txt

EXPOSE 5000
CMD ["gunicorn", "--bind", "0.0.0.0:5000", "wsgi:app"]

Nginx Configuration


server {
    listen 80;
    server_name yourdomain.com;

    location / {
        proxy_pass http://localhost: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;
    }

    location /static/ {
        alias /path/to/your/static/files/;
        expires 30d;
    }
}

Environment Configuration


# config.py
import os

class Config:
    SECRET_KEY = os.environ.get('SECRET_KEY') or 'dev-key'
    SQLALCHEMY_DATABASE_URI = os.environ.get('DATABASE_URL') or \
        'sqlite:///' + os.path.join(basedir, 'app.db')
    SQLALCHEMY_TRACK_MODIFICATIONS = False
    MAIL_SERVER = os.environ.get('MAIL_SERVER')
    MAIL_PORT = int(os.environ.get('MAIL_PORT') or 25)
    MAIL_USE_TLS = os.environ.get('MAIL_USE_TLS') is not None
    MAIL_USERNAME = os.environ.get('MAIL_USERNAME')
    MAIL_PASSWORD = os.environ.get('MAIL_PASSWORD')

Deployment Checklist

Next: RESTful APIs