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man: extend documentation for timedatectl's set-ntp command

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This extends on the relationship between timedatectl's set-ntp command
and its effect on the systemd-timesyncd.service unit. This also links
that unit back to the timedatectl man page.

Closes #798.
This commit is contained in:
Lennart Poettering 2015-08-16 18:26:03 +02:00
parent e6a26d8c97
commit 8731be1a52
2 changed files with 25 additions and 6 deletions
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4
man/systemd-timesyncd.service.xml
View file

@ -71,6 +71,10 @@
files, and the per-link dynamic settings received over DHCP. See
<citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>
for more details.</para>
<para><citerefentry><refentrytitle>timedatectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
<command>set-ntp</command> command may be used to enable and
start, or disable and stop this service.</para>
</refsect1>
<refsect1>

27
man/timedatectl.xml
View file

@ -166,12 +166,27 @@
<term><command>set-ntp [BOOL]</command></term>
<listitem><para>Takes a boolean argument. Controls whether
network time synchronization is enabled (if available). This
enables or disables the
<filename>systemd-timesyncd.service</filename> unit. Note that
even if this command turns time synchronization off a
different system service might still synchronize the clock
with the network.</para></listitem>
network time synchronization is active and enabled (if
available). This enables and starts, or disables and stops the
<filename>systemd-timesyncd.service</filename> unit. It does
not affect the state of any other, unrelated network time
synchronization services that might be installed on the
system. This command is hence mostly equivalent to:
<command>systemctl enable --now
systemd-timesyncd.service</command> and <command>systemctl
disable --now systemd-timesyncd.service</command>, but is
protected by a different access policy.</para>
<para>Note that even if time synchronization is turned off
with this command another, unrelated system service might
still synchronize the clock with the network. Also note that
strictly speaking
<filename>systemd-timesyncd.service</filename> does more than
just network time synchronization as it ensures a monotonic
clock on systems without RTC even if no network is
available. See
<citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
for details about this.</para></listitem>
</varlistentry>
</variablelist>