timesyncd.conf
systemd
timesyncd.conf
5
timesyncd.conf
timesyncd.conf.d
Network Time Synchronization configuration files
/etc/systemd/timesyncd.conf
/etc/systemd/timesyncd.conf.d/*.conf
/run/systemd/timesyncd.conf.d/*.conf
/usr/lib/systemd/timesyncd.conf.d/*.conf
Description
These configuration files control NTP network time synchronization. See
systemd.syntax7
for a general description of the syntax.
Options
The following settings are configured in the [Time] section:
NTP=
A space-separated list of NTP server host
names or IP addresses. During runtime this list is combined
with any per-interface NTP servers acquired from
systemd-networkd.service8.
systemd-timesyncd will contact all configured system or
per-interface servers in turn until one is found that
responds. When the empty string is assigned, the list of
NTP servers is reset, and all assignments prior to this one
will have no effect. This setting defaults to an empty
list.
FallbackNTP=
A space-separated list of NTP server host
names or IP addresses to be used as the fallback NTP servers.
Any per-interface NTP servers obtained from
systemd-networkd.service8
take precedence over this setting, as do any servers set via
NTP= above. This setting is hence only used
if no other NTP server information is known. When the empty
string is assigned, the list of NTP servers is reset,
and all assignments prior to this one will have no effect.
If this option is not given, a compiled-in list of NTP servers
is used instead.
RootDistanceMaxSec=
Maximum acceptable root distance. Takes a time value (in seconds).
Defaults to 5 seconds.
PollIntervalMinSec=
PollIntervalMaxSec=
The minimum and maximum poll intervals for NTP messages.
Each setting takes a time value (in seconds).
PollIntervalMinSec= must not be smaller than 16 seconds.
PollIntervalMaxSec= must be larger than PollIntervalMinSec=.
PollIntervalMinSec= defaults to 32 seconds, and
PollIntervalMaxSec= defaults to 2048 seconds.
ConnectionRetrySec=
Specifies the delaying attempts to contact servers after network is online. Takes a time value (in seconds).
Defaults to 30 seconds and must not be smaller than 1 seconds.
See Also
systemd1,
systemd-timesyncd.service8,
systemd-networkd.service8