MIG Info Webapp

This project provides a simple Flask-based web application that displays metadata and Managed Instance Group (MIG) information from a Google Cloud VM instance. It is intended to be deployed on a VM that is part of a MIG in Google Cloud Platform.

Features

• Retrieves and displays:
  • Private IP address of the instance
  • Hostname
  • Current target size of the associated MIG
• Uses Google Cloud Metadata server for instance-specific data
• Uses the Compute API to query MIG size
• Simple NGINX reverse proxy configuration
• Systemd service for process management

Requirements

• Python 3
• Flask
• google-api-python-client
• google-auth
• NGINX
• Systemd
• Running inside a GCP Compute Engine instance with appropriate permissions (default service account with Compute Viewer role)

File Overview

• webapp.py: Main Flask application
• webapp.conf: NGINX configuration for reverse proxy
• webapp.service: Systemd service file for managing the app

Setup

1. Place the files in /opt/webapp (or another directory, adjust WorkingDirectory accordingly).
2. Install required Python packages:

   pip install flask google-api-python-client google-auth
   

3. Set up the systemd service:

   cp webapp.service /etc/systemd/system/
   systemctl daemon-reexec
   systemctl enable webapp
   systemctl start webapp
   

4. Deploy the NGINX configuration:

   cp webapp.conf /etc/nginx/sites-available/webapp
   ln -s /etc/nginx/sites-available/webapp /etc/nginx/sites-enabled/
   nginx -t
   systemctl reload nginx
   

5. Ensure the VM has access to the GCP metadata server and the necessary IAM permissions.

Security Notes

• The application restricts access to .git paths via NGINX.
• No authentication is implemented; access should be limited by firewall or IAM controls if necessary.

License

MIT License