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NAME | SYNOPSIS | DESCRIPTION | CONFIGURATION DIRECTORIES AND PRECEDENCE | OPTIONS | SEE ALSO | COLOPHON |
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TIMESYNCD.CONF(5) timesyncd.conf 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
These configuration files control NTP network time
synchronization. See systemd.syntax(7) for a general description
of the syntax.
The default configuration is defined during compilation, so a
configuration file is only needed when it is necessary to deviate
from those defaults. By default, the configuration file in
/etc/systemd/ contains commented out entries showing the defaults
as a guide to the administrator. This file can be edited to
create local overrides.
When packages need to customize the configuration, they can
install configuration snippets in /usr/lib/systemd/*.conf.d/ or
/usr/local/lib/systemd/*.conf.d/. The main configuration file is
read before any of the configuration directories, and has the
lowest precedence; entries in a file in any configuration
directory override entries in the single configuration file.
Files in the *.conf.d/ configuration subdirectories are sorted by
their filename in lexicographic order, regardless of in which of
the subdirectories they reside. When multiple files specify the
same option, for options which accept just a single value, the
entry in the file with the lexicographically latest name takes
precedence. For options which accept a list of values, entries
are collected as they occur in files sorted lexicographically.
Files in /etc/ are reserved for the local administrator, who may
use this logic to override the configuration files installed by
vendor packages. It is recommended to prefix all filenames in
those subdirectories with a two-digit number and a dash, to
simplify the ordering of the files.
To disable a configuration file supplied by the vendor, the
recommended way is to place a symlink to /dev/null in the
configuration directory in /etc/, with the same filename as the
vendor configuration file.
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.service(8). 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.service(8) 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.
systemd(1), systemd-timesyncd.service(8),
systemd-networkd.service(8)
This page is part of the systemd (systemd system and service
manager) project. Information about the project can be found at
⟨http://www.freedesktop.org/wiki/Software/systemd⟩. If you have
a bug report for this manual page, see
⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.
This page was obtained from the project's upstream Git repository
⟨https://github.com/systemd/systemd.git⟩ on 2020-12-18. (At that
time, the date of the most recent commit that was found in the
repository was 2020-12-18.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
systemd 247 TIMESYNCD.CONF(5)
Pages that refer to this page: systemd.directives(7), systemd.index(7), systemd.syntax(7), systemd-timesyncd.service(8)
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