NetBox charm architecture

The NetBox charm initial version has been generated with the help of the paas-app-charmer project. The paas-app-charmer project provides many of the functionalities needed by this charm like:

• PostgreSQL integration
• Redis integration
• Django migrations
• Ingress integration
• COS (Prometheus metrics and Loki logs for gunicorn).

For the static assets, gunicorn is used with the help of the WhiteNoiseMiddleware.

There is only one container for each unit of NetBox that runs the following services managed by Pebble:

• django. Runs gunicorn.
• cron. Cron service that runs management commands for housekeeping and syncdatasource.
• statsd_exporter. To expose gunicorn metrics.

Besides the integrations provided directly by the paas-app-charmer toolchain, the following integrations are implemented in NetBox:

• SAML integration.
• S3 integration.

The NetBox charm is designed for a high availability (HA) environment. The NetBox application can be scaled to more than one unit to provide HA. See Configure Scripts and Reports for HA for the requirements to use scripts and reports in HA configuration.