---
url: /reference/environment-variables.md
---
# Environment variables

| Variable | Purpose |
| --- | --- |
| `ADMIN_EMAIL` / `ADMIN_PASSWORD` | credentials used by [`trek:admin:user`](/reference/generators/admin-user) |
| `ADMIN_ALLOWED_IPS` | the IP addresses and ranges the admin answers, e.g. `203.0.113.0/24, 2001:db8::/32`; elsewhere it's a 404 (open to all when unset, see [Proxies](/proxies#restricting-the-admin-to-ip-addresses)) |
| `POSTMARK_API_TOKEN` | Postmark email delivery (auto-injected into credentials by the [installer](/reference/generators/install)) |
| `APPSIGNAL_PUSH_API_KEY` | AppSignal error tracking and performance monitoring (auto-injected into credentials by the [installer](/reference/generators/install)) |
| `APPSIGNAL_APP_ENV` | environment name reported to AppSignal (optional, defaults to `RAILS_ENV`) |
| `FEATURE_AUDIT_LOG` | `false` stops the [audit log](/reference/generators/audit-log) recording requests (on by default) |
| `GOOD_JOB_MAX_THREADS` | number of job threads GoodJob runs, and the share of the database pool reserved for them (optional, defaults to `RAILS_MAX_THREADS`) — see [Background jobs](/background-jobs) |
| `FEATURE_STORAGE` | `s3` stores the uploads on S3 outside production too, e.g. in development; otherwise development stores them in `public/uploads` and the tests in memory. Production always uses S3 |
| `TREK_LOCALES` | the locales the [installer](/reference/generators/install) sets up, comma-separated, e.g. `en,fr,de` (the `--locales` option of `trek:install:locales` too; defaults to `en, fr`) |
| `S3_BUCKET`, `S3_REGION`, `S3_ENDPOINT`, `S3_ACCESS_KEY_ID`, `S3_SECRET_ACCESS_KEY`, `S3_BASE_URL` | S3 storage configuration for [uploads](/reference/uploaders) |