# Requirements

## Supported Environments

The built-in installer targets common systemd-based Linux distributions.

- Ubuntu
- Debian
- RHEL family distributions
- Rocky Linux
- AlmaLinux
- Fedora
- Other systemd-based Linux systems

## System Requirements

| Item | Requirement |
| --- | --- |
| OS | systemd-based Linux |
| CPU architecture | Must match the provided binary. The common distributed binary targets x86\_64 |
| Privilege | Root privilege during installation |
| Network | Outbound HTTPS access to `api.telegram.org` |
| Account | A local Linux account that will run the shell |

## Outside the Built-In Installer Scope

The built-in `install` command is not intended for these environments:

- Non-systemd Linux systems such as Alpine OpenRC
- Windows
- macOS
- Containers that do not run systemd
- Multiple services on one server using the same default `rtmn.service` name

Use [Account-Isolated Installation](https://ubient.dscloud.biz/./06-account-isolated-install.md) when multiple account-specific instances are required.

## Network Requirements

`rtmn` uses the Telegram Bot API, so the server must be able to make outbound HTTPS requests to Telegram.

```
server -> https://api.telegram.org
```

In firewall, proxy, or NAT environments, verify outbound TCP 443 connectivity.

## Privilege Requirements

Root privilege is required for installation, but the service should normally run as a non-root account.

Recommended structure:

```
root
  -> manages the systemd service
  -> protects the environment file

service user
  -> runs shell commands
  -> writes audit logs
```