> For the complete documentation index, see [llms.txt](https://mercure-technologies.gitbook.io/xprem/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mercure-technologies.gitbook.io/xprem/installation-guide/server-configuration.md).

# Server configuration

### Base URL

Your xprem server must be publicly reachable so your apps can fetch updates from it. Point a domain name at your deployment: typically a dedicated subdomain such as `ota.acme.org` or `updates.acme.org`, though a root domain works too.

The URL must use HTTPS.

Keep this URL handy: you'll set it as `BASE_URL` in your deployment config.

### JWT Secret

A JWT Secret is used to sign sessions and upload tokens.

To generate it use:

```
openssl rand -base64 32 
```

Then keep it, you'll set it as `JWT_SECRET` in your deployment config.

### Dashboard credentials

The first time the server starts, it provisions a default admin user from two environment variables:

* `ADMIN_EMAIL`
* `ADMIN_PASSWORD`: at least 8 characters, including an uppercase letter, a lowercase letter, a digit and a special character.

These are read once, during the initial migration. Changing them afterwards has no effect: update your password from the dashboard settings instead.<br>


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