Python Web App

Python web application deployment

Flask App Configuration

1. Clone repository:

   sudo mkdir /etc/local/webs && \
   cd /etc/local/webs && \
   sudo git clone https://github.com/app.git && \
   sudo chown -R <user>:<user> app && \
   cd app

2. Create python virtual environment & install dependencies:

   python -m venv .venv && \
   source .venv/bin/activate && \
   python -m pip install -r requirements.txt

3. Configure WSGI - /usr/local/webs/app/app.wsgi:

   #!/usr/bin/python
   import sys
   import logging
   import os
   
   APP_DIR = "/usr/local/webs/app"
   os.environ["APP_DIR"] = APP_DIR
   
   logging.basicConfig(stream=sys.stderr)
   sys.path.insert(0, APP_DIR)
   
   from app import app as application

4. Update owner:group

   cd /usr/local/web && \
   sudo chown -R www-data:www-data cmat

Apache Configuration

1. Create custom Apache log directory:

   sudo mkdir /usr/local/webs/apache-logs && \
   sudo touch /usr/local/webs/apache-logs/app/error.log && \
   sudo touch /usr/local/webs/apache-logs/app/access.log && \
   sudo chown -R www-data:www-data /usr/local/webs/apache-logs

2. Create configuration file:

   cd /etc/apache2/sites-available && \
   sudo vi app.conf

3. Configuration - app.conf:

   <VirtualHost *:80>
       ServerName {DNS}
   
       ServerSignature Off
   
       RewriteEngine On
       RewriteRule ^ https://%{SERVER_NAME}%{REQUEST_URI} [END,NE,R=permanent]
   
       ErrorLog /var/log/apache2/redirect.error.log
       LogLevel warn
   </VirtualHost>
   
   <VirtualHost *:443>
       ServerAdmin webmaster@localhost
       ServerName {DNS}
   
       DocumentRoot /usr/local/webs/app
   
       WSGIDaemonProcess web-app threads=5 python-home=/usr/local/webs/app/.venv
       WSGIProcessGroup web-app
       WSGIScriptAlias / /usr/local/webs/app/app.wsgi
       WSGIPassAuthorization On
       <Directory /usr/local/webs/app>
               Order allow,deny
               Allow from all
       </Directory>
   
       <Location />
               Require all granted
       </Location>
   
       ErrorLog /usr/local/webs/apache-logs/app/error.log
       CustomLog /usr/local/webs/apache-logs/app/access.log combined
   
       SSLEngine on
       SSLCertificateFile /etc/letsencrypt/live/{DNS}/fullchain.pem
       SSLCertificateKeyFile /etc/letsencrypt/live/{DNS}/privkey.pem
       Include /etc/letsencrypt/options-ssl-apache.conf
   </VirtualHost>

4. Test configuration:

   sudo apache2ctl configtest

5. Enable the site

   sudo a2ensite app.conf

6. Restart Apache service

   sudo systemctl restart apache2