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nixos/timesyncd: further document services.timesyncd.servers

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Running systemd-timesyncd with an empty list of timeservers to sync from
does not work.

In case an empty list is configured here, systemd will fall back to its
compiled-in defaults, which NixOS sets to `{0..4}.nixos.pool.ntp.org`,
as per https://github.com/systemd/systemd/blob/main/docs/DISTRO_PORTING.md#ntp-pool

This has caused some confusion. Explicitly document this, and describe
how to disable timesyncd.
This commit is contained in:
Florian Klink 2024-03-18 17:20:05 +02:00
parent ebaf43d163
commit 78d8e2ca11
1 changed files with 3 additions and 0 deletions
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3
nixos/modules/system/boot/timesyncd.nix
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@ -21,6 +21,9 @@ with lib;
type = types.listOf types.str; type = types.listOf types.str;
description = lib.mdDoc '' description = lib.mdDoc ''
The set of NTP servers from which to synchronise. The set of NTP servers from which to synchronise.
Note if this is set to an empty list, the defaults systemd itself is
compiled with ({0..4}.nixos.pool.ntp.org) apply,
In case you want to disable timesyncd altogether, use the `enable` option.
''; '';
}; };
extraConfig = mkOption { extraConfig = mkOption {