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man: extend watchdog docs a bit

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Lennart Poettering 2012-06-28 00:24:36 +02:00
parent 8f9c0b4cc1
commit dac051ad68
2 changed files with 26 additions and 16 deletions
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19
man/sd_notify.xml
View File

@ -156,12 +156,19 @@
<term>WATCHDOG=1</term>
<listitem><para>Tells systemd to
update the watchdog timestamp.
Services using this feature should do
this in regular intervals. A watchdog
framework can use the timestamps to
detect failed
services.</para></listitem>
update the watchdog timestamp. This is
the keep-alive ping that services need
to issue in regular intervals if
<varname>WatchdogSec=</varname> is
enabled for it. See
<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
for details. It is recommended to send
this message if the
<varname>WATCHDOG_USEC=</varname>
environment variable has been set for
the service process, in every half the
time interval that is specified in the
variable.</para></listitem>
</varlistentry>
</variablelist>

23
man/systemd.service.xml
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@ -482,26 +482,29 @@
is activated when the start-up is
completed. The service must call
<citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>
regularly with "WATCHDOG=1". If the
time between two such calls is larger
than the configured time then the
service is placed in a failure
state. By setting
<varname>Restart=</varname>
to <option>on-failure</option> or
regularly with "WATCHDOG=1" (i.e. the
"keep-alive ping"). If the time
between two such calls is larger than
the configured time then the service
is placed in a failure state. By
setting <varname>Restart=</varname> to
<option>on-failure</option> or
<option>always</option> the service
will be automatically restarted. The
time configured here will be passed to
the executed service process in the
<varname>WATCHDOG_USEC=</varname>
environment variable. If
environment variable. This allows
daemons to automatically enable the
keep-alive pinging logic if watchdog
support is enabled for the service. If
this option is used
<varname>NotifyAccess=</varname> (see
below) should be set to open access to
the notification socket provided by
systemd. If
<varname>NotifyAccess=</varname> is not
set, it will be implicitly set to
<varname>NotifyAccess=</varname> is
not set, it will be implicitly set to
<option>main</option>. Defaults to 0,
which disables this
feature.</para></listitem>