Operations grimoire/NTP: Difference between revisions
From Nasqueron Agora
Created page with "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 <code>480.status-ntpd</code>. === Linux === Chrony service is used. ==..." |
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=== Update leap seconds === | === Update leap seconds === | ||
Leap seconds file isn't maintained any more by NTP package (see [https://bugs.ntp.org/show_bug.cgi?id=3898 upstream issue]) | Leap seconds file isn't maintained any more by NTP package (see [https://bugs.ntp.org/show_bug.cgi?id=3898 upstream issue]) | ||
=== ntpq: read: Connection refused === | |||
Reported as {{T|2192}. 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: <code>service ntpd start</code> | |||
== References == | == References == | ||
Revision as of 09:16, 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.
Linux
Chrony service is used.
Troubleshoot
Update leap seconds
Leap seconds file isn't maintained any more by NTP package (see upstream issue)
ntpq: read: Connection refused
Reported as {{T|2192}. 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
