Time.lan.nurd.space: Difference between revisions

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This is the main time server for NURDSpace. "Connect" using NTP (or SNTP) - most (if not all) operating systems support NTP in some form.
This is the main time server for NURDSpace. "Connect" using NTP (or SNTP) - most (if not all) operating systems support NTP in some form.
And as we have UNLIMITED (well almost) internet bandwidth, it is also part of https://www.ntppool.org/ (configured at half a megabit).


=== pro tip ===
=== pro tip ===
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* it (the pi) is also the "emergency"-gateway for when the regular internet connection is not available
* it (the pi) is also the "emergency"-gateway for when the regular internet connection is not available
* CPU clock frequency scaling has been disabled as scaling negatively affects time keeping


== monitoring ==
== monitoring ==
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* as it is part of the global NTP-pool, statistics can be viewed at https://www.ntppool.org/scores/185.2.240.92
* as it is part of the global NTP-pool, statistics can be viewed at https://www.ntppool.org/scores/185.2.240.92
* also [[folkert]] has a monitoring server: https://gateway.vanheusden.com/ntp/show-server?host=space.nurdspace.nl
* also [[folkert]] has a monitoring server: https://gateway.vanheusden.com/ntp/show-server?host=space.nurdspace.nl
* every minute the script /root/bin/monitor-ntp-traffic.sh is invoked by cron. The script reads the iptables-rule statistics (an ACCEPT rule added by a @reboot-rule in the root-crontab) and sends those values to influx.vm.nurd.space:2012 (a graphite receiver for the influx NTP database). This data is graphed at metrics.nurd.space (grafana): https://metrics.nurd.space/d/bfhlkmlss8d1ca/time-lan-nurd-space?orgId=1&from=now-24h&to=now&timezone=browser&refresh=5s Also the temperature is monitored by monitor-sys-temp.sh

Latest revision as of 20:02, 30 March 2026

time - THE time-source for NURDSpace
Time.lan.nurd.space pica.png
Participants
Skills ntp, gps, ptp
Status In progress
Niche Time
Purpose Use for infra
Tool Yes
Location bij de bar
Cost
Tool category General

time - THE time-source for NURDSpace

Time.lan.nurd.space pica.png {{#if:Yes | [[Tool Owner::{{{ProjectParticipants}}} | }} {{#if:Yes | [[Tool Cost::{{{Cost}}} | }}


what it is

This is the main time server for NURDSpace. "Connect" using NTP (or SNTP) - most (if not all) operating systems support NTP in some form.

And as we have UNLIMITED (well almost) internet bandwidth, it is also part of https://www.ntppool.org/ (configured at half a megabit).

pro tip

On ESP32, do not use some vague NTP library: the IDF/Arduino SDK on that platform contains a very capable NTP implementation by itself (google for configTime).

where?

Currently (2026/03/30) it is on a shelf next to the serverrack in the old printer-corner.

Time.lan.nurd.space.png

who?

This thing is managed by folkert & melan.

specs

  • gpsd - GPS: GY-GPSV3-NEO-M8N GNSS-GPS Module
  • ntpsec

networking

  • hostname: time.lan.nurd.space
  • ip-adress: 10.208.0.10

notes

  • the system runs a special 'realtime kernel', please be careful not to replace it when updating raspberryos!
    • special settings:
      • 100 Hz interrupt
      • nohz=off
      • realtime kernel
      • preemptible kernel
  • it (the pi) is also the "emergency"-gateway for when the regular internet connection is not available
  • CPU clock frequency scaling has been disabled as scaling negatively affects time keeping

monitoring