# NTP Style Guide

> [crefft](/index.md) > [Infrastructure](/guides/infrastructure.md) > NTP

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC 2119](https://datatracker.ietf.org/doc/html/rfc2119).

## Quick Reference

| Task         | Tool    | Command              |
| ------------ | ------- | -------------------- |
| Install      | apt     | `apt install chrony` |
| Check sync   | chronyc | `chronyc tracking`   |
| List sources | chronyc | `chronyc sources -v` |

## Overview

TODO: Time synchronization with chrony for Debian systems.

## Configuration

TODO: `/etc/chrony/chrony.conf` configuration.

## Hardening

TODO: NTS (Network Time Security), access control.

## Monitoring

TODO: Prometheus chrony exporter, alerting on drift.

## See Also

* [Linux Guide](/guides/infrastructure/os/linux.md) — Base OS configuration
* [SSH Guide](/guides/infrastructure/services/ssh.md) — Secure remote access

---

Source version: 2026.10.4. [Source file](https://github.com/agh/crefft/blob/703c8156f7604b464921c851535242202541cfb3/guides/infrastructure/services/ntp.md).