> ## Documentation Index
> Fetch the complete documentation index at: https://docs.blink.so/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Server Options

> Configuration options for the Blink Server.

Configure the Blink Server using CLI flags or environment variables.

## Configuration Reference

| Environment Variable        | CLI Flag                | Default                            | Description                                                                           |
| --------------------------- | ----------------------- | ---------------------------------- | ------------------------------------------------------------------------------------- |
| `BLINK_HOST`                | `-h, --host`            | `0.0.0.0`                          | Host to bind the server to                                                            |
| `BLINK_PORT`                | `-p, --port`            | `3005`                             | Port to run the server on                                                             |
| `BLINK_ACCESS_URL`          | `--access-url`          | -                                  | Public access URL for the server                                                      |
| `BLINK_AUTH_SECRET`         | `--auth-secret`         | (auto-generated)                   | Secret used for authentication                                                        |
| `BLINK_POSTGRES_URL`        | `--postgres-url`        | -                                  | PostgreSQL connection URL                                                             |
| `BLINK_WILDCARD_ACCESS_URL` | `--wildcard-access-url` | -                                  | Wildcard domain for subdomain routing. See [Webhooks and Devhooks](/server/webhooks). |
| `BLINK_AGENT_IMAGE`         | `--agent-image`         | `ghcr.io/coder/blink-agent:latest` | Docker image for agent containers                                                     |

## Configuration Priority

CLI flags take precedence over environment variables, which take precedence over default values.

## Auto-Generated Secrets

If `BLINK_AUTH_SECRET` is not set, the server automatically generates and stores a secret in `~/.config/blink-server/auth-secret.txt`. Set this explicitly in production.

## PostgreSQL Connection

The `BLINK_POSTGRES_URL` should be a standard PostgreSQL connection string:

```
postgresql://user:password@host:5432/database
```

Migrations run automatically on server startup.