diff options
Diffstat (limited to 'man/timedatectl.xml')
| -rw-r--r-- | man/timedatectl.xml | 29 |
1 files changed, 22 insertions, 7 deletions
diff --git a/man/timedatectl.xml b/man/timedatectl.xml index 2d42b41d5e..415e2c799a 100644 --- a/man/timedatectl.xml +++ b/man/timedatectl.xml @@ -108,7 +108,7 @@ on. Note that whether network time synchronization is on simply reflects whether the <filename>systemd-timesyncd.service</filename> unit is - enabled. Even if this command shows the status as off a + enabled. Even if this command shows the status as off, a different service might still synchronize the clock with the network.</para></listitem> </varlistentry> @@ -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> |