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man: explain settings in timesyncd.conf(5)

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Fixes #18508.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2021-02-25 13:57:20 +01:00
parent d5630d2795
commit c91ebcdbd1
1 changed files with 33 additions and 28 deletions
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61
man/timesyncd.conf.xml
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@ -47,54 +47,59 @@
<varlistentry>
<term><varname>NTP=</varname></term>
<listitem><para>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
<listitem><para>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
<citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
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.</para></listitem>
<command>systemd-timesyncd</command> will contact all configured system or per-interface servers in
turn, until one responds. When the empty string is assigned, the list of NTP servers is reset, and
all prior assignments will have no effect. This setting defaults to an empty list.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>FallbackNTP=</varname></term>
<listitem><para>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
<listitem><para>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
<citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
take precedence over this setting, as do any servers set via
<varname>NTP=</varname> 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.</para></listitem>
take precedence over this setting, as do any servers set via <varname>NTP=</varname> above. This
setting is hence only relevant if no other NTP server information is known. When the empty string is
assigned, the list of NTP servers is reset, and all prior assignments will have no effect. If this
option is not given, a compiled-in list of NTP servers is used.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>RootDistanceMaxSec=</varname></term>
<listitem><para>Maximum acceptable root distance. Takes a time value (in seconds).
<listitem><para>Maximum acceptable root distance, i.e. the maximum estimated time required for a
packet to travel to the server we are connected to from the server with the reference clock. If
the current server does not satisfy this limit, <command>systemd-timesyncd</command> will switch
to a different server.</para>
<para>Takes a time value. The default unit is seconds, but other units may be specified, see
<citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
Defaults to 5 seconds.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>PollIntervalMinSec=</varname></term>
<term><varname>PollIntervalMaxSec=</varname></term>
<listitem><para>The minimum and maximum poll intervals for NTP messages.
Each setting takes a time value (in seconds).
<varname>PollIntervalMinSec=</varname> must not be smaller than 16 seconds.
<varname>PollIntervalMaxSec=</varname> must be larger than <varname>PollIntervalMinSec=</varname>.
<varname>PollIntervalMinSec=</varname> defaults to 32 seconds, and
<varname>PollIntervalMaxSec=</varname> defaults to 2048 seconds.</para></listitem>
<listitem><para>The minimum and maximum poll intervals for NTP messages. Polling starts at the
minimum poll interval, and is adjusted within the specified limits in response to received packets.
</para>
<para>Each setting takes a time value. The default unit is seconds, but other units may be specified,
see <citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
<varname>PollIntervalMinSec=</varname> defaults to 32 seconds and must not be smaller than
16 seconds. <varname>PollIntervalMaxSec=</varname> defaults to 34 min 8 s (2048 seconds) and must be
larger than <varname>PollIntervalMinSec=</varname>.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>ConnectionRetrySec=</varname></term>
<listitem><para>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.</para></listitem>
<listitem><para>Specifies the minimum delay before subsequent attempts to contact a new NTP server
are made.</para>
<para>Takes a time value. The default unit is seconds, but other units may be specified, see
<citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
Defaults to 30 seconds and must not be smaller than 1 second.</para></listitem>
</varlistentry>
</variablelist>