peeringdb-peeringdb/docs/dev/settings.md

Location

Settings are defined in /mainsite/settings/__init__.py

Environments may also override settings by specifying their own file (e.g., /mainsite/settings/dev.py)

Environments may also override settings by exporting them as environment variables.

export GOOGLE_GEOLOC_API_KEY=abcde

Adding new settings

When adding a setting use the set_from_env and the set_option wrappers to do so.

These ensure that the overrides mentioned above are functional. Use set_from_env for variables you anticipate are definitely going to be overridden on a per environment basis.

Use set_option for everything else.