Some applications need to connect to databases or caches. Use these hostnames from inside your site — they only resolve within your hosting container, so they don't work from your laptop.

| Service     | Hostname    | Default port | Notes                                                                            |
| ----------- | ----------- | ------------ | -------------------------------------------------------------------------------- |
| MySQL       | `mysql`     | 3306         | Username, password, and database from the **MySQL Management** page.             |
| PostgreSQL  | `postgres`  | 5432         | Username, password, and database from the **PostgreSQL** page.                   |
| Valkey      | `valkey`    | 6379         | Redis wire-compatible (phpredis, Predis, ioredis work unchanged). No password — the connection is network-isolated to your account. Enable on the **Valkey Cache** page first. |

For **email**, the mail server hostname is a per-server value (e.g. `mail01.cloud-hosting.io`) and is shown on the **Dashboard** page under Server Information.

**Connecting from your laptop?** Use the panel's **phpMyAdmin** (MySQL) or **Adminer** (PostgreSQL) for ad-hoc queries — direct external connections to these internal services are not exposed for security reasons.