Operations grimoire/NTP: Difference between revisions
From Nasqueron Agora
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=== FreeBSD === | === FreeBSD === | ||
We use ntpd service. Each day, drift from NTP servers is checked by periodic <code>480.status-ntpd</code>. | We use ntpd service. Each day, drift from NTP servers is checked by periodic <code>480.status-ntpd</code>. | ||
We configured the ntpd to allow it to connect automatically. : https://devcentral.nasqueron.org/rOPS27946aeb13d18e3e54b72aabf170bd66e111ca88 or https://devcentral.nasqueron.org/D3893 | |||
=== Linux === | === Linux === | ||
Revision as of 16:16, 27 November 2025
NTP allows to sync time. That's especially important for accurate logs and TLS certificates.
Recommended NTP servers
There is a CC list of servers by country. France makes sense for most servers to use the country of the datacenter where the server is located.
By OS
NTP is configured in core.
FreeBSD
We use ntpd service. Each day, drift from NTP servers is checked by periodic 480.status-ntpd.
We configured the ntpd to allow it to connect automatically. : https://devcentral.nasqueron.org/rOPS27946aeb13d18e3e54b72aabf170bd66e111ca88 or https://devcentral.nasqueron.org/D3893
Linux
Chrony service is used.
Troubleshoot
Update leap seconds
Leap seconds file isn't maintained any more by NTP package (see upstream issue)
To update the file, run the hotfix:
$ salt -G 'os:FreeBSD' state.apply hotfixes/leap-seconds.sls
ntpq: read: Connection refused
Reported as T2192. The ntpq command queries a specific NTP server, here localhost:123. If the connection can't be established, it probably means ntpd service isn't started.
NTP status: ntpq: read: Connection refused
Solution: service ntpd start
References
- NTP
- NTP servers in France
- Bug 3898 - update leap seconds file
- Chrony
