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3.1 KiB
Markdown
143 lines
3.1 KiB
Markdown
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# Chrony for Ubuntu 24.04 Server
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[](#)
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[](#)
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[](#)
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[](./LICENSE)
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Install Chrony on Ubuntu 24.04 server.
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This isn't a demo - This installer is intended for real servers.
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If you want ntpd nostalgia, this is NOT your script.
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---
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## Why this installer exists
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Ubuntu 24.04 retired `ntpd`, `ntpdate`, and `systemd-timesyncd` as primary time sync mechanisms.
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Chrony is now the only supported, sane, and future-proof NTP client.
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This installer:
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- Follows Canonical’s current direction
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- Avoids deprecated packages and aliases
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- Gives you deterministic, predictable time sync
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---
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## What this installer does
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✔ Installs Chrony (Ubuntu default)
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✔ Enables and starts the Chrony service
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✔ Configures pool.ntp.org servers explicitly
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✔ Forces an initial clock sync (`makestep`)
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✔ Leaves legacy NTP components untouched (because they shouldn’t exist)
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---
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## What this installer does NOT do
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It won’t stop you from running the script without reading the documentation like there’s no tomorrow. Skip the README, and whatever happens next is your headache, not a bug report.
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---
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## 1. Prepare the system
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```
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sudo apt update -y
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```
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---
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## 2. Download
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```
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git clone https://git.x-files.dk/server/chrony-ubuntu.git
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```
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```
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cd chrony-ubuntu
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```
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---
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## 3. Install
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```
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sudo ./chrony-install
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```
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This configures the machine to use reliable upstream time servers and enables sync automatically.
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---
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## 4. Verify Synchronization
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```
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chronyc sources -v
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```
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If the peers list is present and updating — you're synced and good to go.
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---
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## Post-Install
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Nothing else required — time sync is automatic.
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---
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## Client vs Server mode (important)
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This installer always installs **Chrony**, which on Ubuntu 24.04 replaces both:
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- legacy `ntp-client`
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- legacy `ntpd` server setups
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### Default behavior (Client only)
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Out of the box, Chrony runs in **client-only mode**:
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- Syncs time from upstream servers
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- Does **not** serve time to other machines
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- Does **not** listen on UDP/123
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This is the functional equivalent of an old “NTP client” setup.
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### Optional: Serve time to other machines (LAN / offline networks)
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If this machine should also act as a **local NTP server**, only **two lines** are required in `/etc/chrony/chrony.conf`:
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```
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allow 192.168.0.0/24
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local stratum 10
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```
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What these lines do:
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- `allow` — permits NTP clients from the specified network
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- `local stratum 10` — provides a safe fallback clock if upstream sources disappear
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Restart Chrony:
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```
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systemctl restart chrony
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```
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If a firewall is enabled:
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```
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ufw allow from 192.168.0.0/24 to any port 123 proto udp
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```
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Chrony will now act as **both client and server**, fully replacing the Ubuntu 22.04 NTP server pattern.
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---
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### More Information
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More guides and documentation can be found on [wiki.x-files.dk](https://wiki.x-files.dk)
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---
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### License
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Licensed under the [MIT License](./LICENSE).
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---
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