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import systemd-252-32.el9_4
6 months ago
From e8de964c146f67c91acdaff076420282c2d1b217 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Mon, 2 Jan 2023 18:13:27 +0100
Subject: [PATCH] man: document Type=notify-reload
(cherry picked from commit 81e19b6f6585d656e972efad73781e184ca0e7a0)
Related: RHEL-6090
---
man/sd_notify.xml | 36 ++++--
man/systemd.service.xml | 248 ++++++++++++++++++++++------------------
2 files changed, 162 insertions(+), 122 deletions(-)
diff --git a/man/sd_notify.xml b/man/sd_notify.xml
index de402950bb..d2dba00004 100644
--- a/man/sd_notify.xml
+++ b/man/sd_notify.xml
@@ -102,23 +102,35 @@
<varlistentry>
<term>READY=1</term>
- <listitem><para>Tells the service manager that service startup is finished, or the service finished loading its
- configuration. This is only used by systemd if the service definition file has <varname>Type=notify</varname>
- set. Since there is little value in signaling non-readiness, the only value services should send is
- <literal>READY=1</literal> (i.e. <literal>READY=0</literal> is not defined).</para></listitem>
+ <listitem><para>Tells the service manager that service startup is finished, or the service finished
+ re-loading its configuration. This is only used by systemd if the service definition file has
+ <varname>Type=notify</varname> or <varname>Type=notify-reload</varname> set. Since there is little
+ value in signaling non-readiness, the only value services should send is <literal>READY=1</literal>
+ (i.e. <literal>READY=0</literal> is not defined).</para></listitem>
</varlistentry>
<varlistentry>
<term>RELOADING=1</term>
- <listitem><para>Tells the service manager that the service is
- reloading its configuration. This is useful to allow the
- service manager to track the service's internal state, and
- present it to the user. Note that a service that sends this
- notification must also send a <literal>READY=1</literal>
- notification when it completed reloading its
- configuration. Reloads are propagated in the same way as they
- are when initiated by the user.</para></listitem>
+ <listitem><para>Tells the service manager that the service is beginning to reload its
+ configuration. This is useful to allow the service manager to track the service's internal state, and
+ present it to the user. Note that a service that sends this notification must also send a
+ <literal>READY=1</literal> notification when it completed reloading its configuration. Reloads the
+ service manager is notified about with this mechanisms are propagated in the same way as they are
+ when originally initiated through the service manager. This message is particularly relevant for
+ <varname>Type=notify-reload</varname> services, to inform the service manager that the request to
+ reload the service has been received and is now being processed.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>MONOTONIC_USEC=…</term>
+
+ <listitem><para>A field carrying the monotonic timestamp (as per
+ <constant>CLOCK_MONOTONIC</constant>) formatted in decimal in µs, when the notification message was
+ generated by the client. This is typically used in combination with <literal>RELOADING=1</literal>,
+ to allow the service manager to properly synchronize reload cycles. See
+ <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ for details, specifically <literal>Type=notify-reload</literal>.</para></listitem>
</varlistentry>
<varlistentry>
diff --git a/man/systemd.service.xml b/man/systemd.service.xml
index 1c9e59f722..ae54332440 100644
--- a/man/systemd.service.xml
+++ b/man/systemd.service.xml
@@ -157,7 +157,7 @@
<listitem>
<para>Configures the process start-up type for this service unit. One of <option>simple</option>,
<option>exec</option>, <option>forking</option>, <option>oneshot</option>, <option>dbus</option>,
- <option>notify</option> or <option>idle</option>:</para>
+ <option>notify</option>, <option>notify-reload</option> or <option>idle</option>:</para>
<itemizedlist>
<listitem><para>If set to <option>simple</option> (the default if <varname>ExecStart=</varname> is
@@ -216,14 +216,30 @@
logic thus should be prepared to receive a <constant>SIGTERM</constant> (or whichever signal is
configured in <varname>KillSignal=</varname>) as result.</para></listitem>
- <listitem><para>Behavior of <option>notify</option> is similar to <option>exec</option>; however, it is
- expected that the service sends a notification message via
- <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry> or an
- equivalent call when it has finished starting up. systemd will proceed with starting follow-up units after
- this notification message has been sent. 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 missing or set to <option>none</option>, it will be forcibly set to
- <option>main</option>.</para></listitem>
+ <listitem><para>Behavior of <option>notify</option> is similar to <option>exec</option>; however,
+ it is expected that the service sends a <literal>READY=1</literal> notification message via
+ <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry> or
+ an equivalent call when it has finished starting up. systemd will proceed with starting follow-up
+ units after this notification message has been sent. 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 missing or set to
+ <option>none</option>, it will be forcibly set to <option>main</option>.</para></listitem>
+
+ <listitem><para>Behavior of <option>notify-reload</option> is identical to
+ <option>notify</option>. However, it extends the logic in one way: the
+ <constant>SIGHUP</constant> UNIX process signal is sent to the service's main process when the
+ service is asked to reload. (The signal to send can be tweaked via
+ <varname>ReloadSignal=</varname>, see below.). When
+ initiating the reload process the service is then expected to reply with a notification message
+ via <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ that contains the <literal>RELOADING=1</literal> field in combination with
+ <literal>MONOTONIC_USEC=</literal> set to the current monotonic time
+ (i.e. <constant>CLOCK_MONOTONIC</constant> in
+ <citerefentry><refentrytitle>clock_gettime</refentrytitle><manvolnum>2</manvolnum></citerefentry>)
+ in µs, formatted as decimal string. Once reloading is complete another notification message must
+ be sent, containing <literal>READY=1</literal>. Using this service type and implementing this
+ reload protocol is an efficient alternative to providing an <varname>ExecReload=</varname>
+ command for reloading of the service's configuration.</para></listitem>
<listitem><para>Behavior of <option>idle</option> is very similar to <option>simple</option>; however,
actual execution of the service program is delayed until all active jobs are dispatched. This may be used
@@ -233,25 +249,27 @@
anyway.</para></listitem>
</itemizedlist>
- <para>It is generally recommended to use <varname>Type=</varname><option>simple</option> for long-running
- services whenever possible, as it is the simplest and fastest option. However, as this service type won't
- propagate service start-up failures and doesn't allow ordering of other units against completion of
- initialization of the service (which for example is useful if clients need to connect to the service through
- some form of IPC, and the IPC channel is only established by the service itself — in contrast to doing this
- ahead of time through socket or bus activation or similar), it might not be sufficient for many cases. If so,
- <option>notify</option> or <option>dbus</option> (the latter only in case the service provides a D-Bus
- interface) are the preferred options as they allow service program code to precisely schedule when to
- consider the service started up successfully and when to proceed with follow-up units. The
- <option>notify</option> service type requires explicit support in the service codebase (as
- <function>sd_notify()</function> or an equivalent API needs to be invoked by the service at the appropriate
- time) — if it's not supported, then <option>forking</option> is an alternative: it supports the traditional
- UNIX service start-up protocol. Finally, <option>exec</option> might be an option for cases where it is
- enough to ensure the service binary is invoked, and where the service binary itself executes no or little
- initialization on its own (and its initialization is unlikely to fail). Note that using any type other than
- <option>simple</option> possibly delays the boot process, as the service manager needs to wait for service
- initialization to complete. It is hence recommended not to needlessly use any types other than
- <option>simple</option>. (Also note it is generally not recommended to use <option>idle</option> or
- <option>oneshot</option> for long-running services.)</para>
+ <para>It is generally recommended to use <varname>Type=</varname><option>simple</option> for
+ long-running services whenever possible, as it is the simplest and fastest option. However, as this
+ service type won't propagate service start-up failures and doesn't allow ordering of other units
+ against completion of initialization of the service (which for example is useful if clients need to
+ connect to the service through some form of IPC, and the IPC channel is only established by the
+ service itself — in contrast to doing this ahead of time through socket or bus activation or
+ similar), it might not be sufficient for many cases. If so, <option>notify</option>,
+ <option>notify-reload</option> or <option>dbus</option> (the latter only in case the service
+ provides a D-Bus interface) are the preferred options as they allow service program code to
+ precisely schedule when to consider the service started up successfully and when to proceed with
+ follow-up units. The <option>notify</option>/<option>notify-reload</option> service types require
+ explicit support in the service codebase (as <function>sd_notify()</function> or an equivalent API
+ needs to be invoked by the service at the appropriate time) — if it's not supported, then
+ <option>forking</option> is an alternative: it supports the traditional UNIX service start-up
+ protocol. Finally, <option>exec</option> might be an option for cases where it is enough to ensure
+ the service binary is invoked, and where the service binary itself executes no or little
+ initialization on its own (and its initialization is unlikely to fail). Note that using any type
+ other than <option>simple</option> possibly delays the boot process, as the service manager needs
+ to wait for service initialization to complete. It is hence recommended not to needlessly use any
+ types other than <option>simple</option>. (Also note it is generally not recommended to use
+ <option>idle</option> or <option>oneshot</option> for long-running services.)</para>
</listitem>
</varlistentry>
@@ -319,9 +337,10 @@
the file may not be a symlink to a file owned by a different user (neither directly nor indirectly), and the
PID file must refer to a process already belonging to the service.</para>
- <para>Note that PID files should be avoided in modern projects. Use <option>Type=notify</option> or
- <option>Type=simple</option> where possible, which does not require use of PID files to determine the
- main process of a service and avoids needless forking.</para></listitem>
+ <para>Note that PID files should be avoided in modern projects. Use <option>Type=notify</option>,
+ <option>Type=notify-reload</option> or <option>Type=simple</option> where possible, which does not
+ require use of PID files to determine the main process of a service and avoids needless
+ forking.</para></listitem>
</varlistentry>
<varlistentry>
@@ -443,12 +462,13 @@
with a <literal>-</literal> exit successfully.</para>
<para><varname>ExecStartPost=</varname> commands are only run after the commands specified in
- <varname>ExecStart=</varname> have been invoked successfully, as determined by <varname>Type=</varname>
- (i.e. the process has been started for <varname>Type=simple</varname> or <varname>Type=idle</varname>, the last
- <varname>ExecStart=</varname> process exited successfully for <varname>Type=oneshot</varname>, the initial
- process exited successfully for <varname>Type=forking</varname>, <literal>READY=1</literal> is sent for
- <varname>Type=notify</varname>, or the <varname>BusName=</varname> has been taken for
- <varname>Type=dbus</varname>).</para>
+ <varname>ExecStart=</varname> have been invoked successfully, as determined by
+ <varname>Type=</varname> (i.e. the process has been started for <varname>Type=simple</varname> or
+ <varname>Type=idle</varname>, the last <varname>ExecStart=</varname> process exited successfully for
+ <varname>Type=oneshot</varname>, the initial process exited successfully for
+ <varname>Type=forking</varname>, <literal>READY=1</literal> is sent for
+ <varname>Type=notify</varname>/<varname>Type=notify-reload</varname>, or the
+ <varname>BusName=</varname> has been taken for <varname>Type=dbus</varname>).</para>
<para>Note that <varname>ExecStartPre=</varname> may not be
used to start long-running processes. All processes forked
@@ -487,30 +507,26 @@
<varlistentry>
<term><varname>ExecReload=</varname></term>
- <listitem><para>Commands to execute to trigger a configuration
- reload in the service. This argument takes multiple command
- lines, following the same scheme as described for
- <varname>ExecStart=</varname> above. Use of this setting is
- optional. Specifier and environment variable substitution is
- supported here following the same scheme as for
+
+ <listitem><para>Commands to execute to trigger a configuration reload in the service. This argument
+ takes multiple command lines, following the same scheme as described for
+ <varname>ExecStart=</varname> above. Use of this setting is optional. Specifier and environment
+ variable substitution is supported here following the same scheme as for
<varname>ExecStart=</varname>.</para>
- <para>One additional, special environment variable is set: if
- known, <varname>$MAINPID</varname> is set to the main process
- of the daemon, and may be used for command lines like the
- following:</para>
+ <para>One additional, special environment variable is set: if known, <varname>$MAINPID</varname> is
+ set to the main process of the daemon, and may be used for command lines like the following:</para>
<programlisting>ExecReload=kill -HUP $MAINPID</programlisting>
- <para>Note however that reloading a daemon by sending a signal
- (as with the example line above) is usually not a good choice,
- because this is an asynchronous operation and hence not
- suitable to order reloads of multiple services against each
- other. It is strongly recommended to set
- <varname>ExecReload=</varname> to a command that not only
- triggers a configuration reload of the daemon, but also
- synchronously waits for it to complete. For example,
- <citerefentry project='mankier'><refentrytitle>dbus-broker</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+ <para>Note however that reloading a daemon by enqueing a signal (as with the example line above) is
+ usually not a good choice, because this is an asynchronous operation and hence not suitable when
+ ordering reloads of multiple services against each other. It is thus strongly recommended to either
+ use <varname>Type=</varname><option>notify-reload</option> in place of
+ <varname>ExecReload=</varname>, or to set <varname>ExecReload=</varname> to a command that not only
+ triggers a configuration reload of the daemon, but also synchronously waits for it to complete. For
+ example, <citerefentry
+ project='mankier'><refentrytitle>dbus-broker</refentrytitle><manvolnum>1</manvolnum></citerefentry>
uses the following:</para>
<programlisting>ExecReload=busctl call org.freedesktop.DBus \
@@ -605,12 +621,13 @@
<citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>).
</para>
- <para>If a service of <varname>Type=notify</varname> sends <literal>EXTEND_TIMEOUT_USEC=…</literal>, this may cause
- the start time to be extended beyond <varname>TimeoutStartSec=</varname>. The first receipt of this message
- must occur before <varname>TimeoutStartSec=</varname> is exceeded, and once the start time has extended beyond
- <varname>TimeoutStartSec=</varname>, the service manager will allow the service to continue to start, provided
- the service repeats <literal>EXTEND_TIMEOUT_USEC=…</literal> within the interval specified until the service
- startup status is finished by <literal>READY=1</literal>. (see
+ <para>If a service of <varname>Type=notify</varname>/<varname>Type=notify-reload</varname> sends
+ <literal>EXTEND_TIMEOUT_USEC=…</literal>, this may cause the start time to be extended beyond
+ <varname>TimeoutStartSec=</varname>. The first receipt of this message must occur before
+ <varname>TimeoutStartSec=</varname> is exceeded, and once the start time has extended beyond
+ <varname>TimeoutStartSec=</varname>, the service manager will allow the service to continue to start,
+ provided the service repeats <literal>EXTEND_TIMEOUT_USEC=…</literal> within the interval specified
+ until the service startup status is finished by <literal>READY=1</literal>. (see
<citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>).
</para></listitem>
</varlistentry>
@@ -633,12 +650,14 @@
<citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>).
</para>
- <para>If a service of <varname>Type=notify</varname> sends <literal>EXTEND_TIMEOUT_USEC=…</literal>, this may cause
- the stop time to be extended beyond <varname>TimeoutStopSec=</varname>. The first receipt of this message
- must occur before <varname>TimeoutStopSec=</varname> is exceeded, and once the stop time has extended beyond
- <varname>TimeoutStopSec=</varname>, the service manager will allow the service to continue to stop, provided
- the service repeats <literal>EXTEND_TIMEOUT_USEC=…</literal> within the interval specified, or terminates itself
- (see <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>).
+ <para>If a service of <varname>Type=notify</varname>/<varname>Type=notify-reload</varname> sends
+ <literal>EXTEND_TIMEOUT_USEC=…</literal>, this may cause the stop time to be extended beyond
+ <varname>TimeoutStopSec=</varname>. The first receipt of this message must occur before
+ <varname>TimeoutStopSec=</varname> is exceeded, and once the stop time has extended beyond
+ <varname>TimeoutStopSec=</varname>, the service manager will allow the service to continue to stop,
+ provided the service repeats <literal>EXTEND_TIMEOUT_USEC=…</literal> within the interval specified,
+ or terminates itself (see
+ <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>).
</para></listitem>
</varlistentry>
@@ -661,13 +680,15 @@
<citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>).
</para>
- <para>If a service of <varname>Type=notify</varname> handles <constant>SIGABRT</constant> itself (instead of relying
- on the kernel to write a core dump) it can send <literal>EXTEND_TIMEOUT_USEC=…</literal> to
- extended the abort time beyond <varname>TimeoutAbortSec=</varname>. The first receipt of this message
- must occur before <varname>TimeoutAbortSec=</varname> is exceeded, and once the abort time has extended beyond
- <varname>TimeoutAbortSec=</varname>, the service manager will allow the service to continue to abort, provided
- the service repeats <literal>EXTEND_TIMEOUT_USEC=…</literal> within the interval specified, or terminates itself
- (see <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>).
+ <para>If a service of <varname>Type=notify</varname>/<varname>Type=notify-reload</varname> handles
+ <constant>SIGABRT</constant> itself (instead of relying on the kernel to write a core dump) it can
+ send <literal>EXTEND_TIMEOUT_USEC=…</literal> to extended the abort time beyond
+ <varname>TimeoutAbortSec=</varname>. The first receipt of this message must occur before
+ <varname>TimeoutAbortSec=</varname> is exceeded, and once the abort time has extended beyond
+ <varname>TimeoutAbortSec=</varname>, the service manager will allow the service to continue to abort,
+ provided the service repeats <literal>EXTEND_TIMEOUT_USEC=…</literal> within the interval specified,
+ or terminates itself (see
+ <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>).
</para></listitem>
</varlistentry>
@@ -710,12 +731,13 @@
activation completed. Pass <literal>infinity</literal> (the default) to configure no runtime
limit.</para>
- <para>If a service of <varname>Type=notify</varname> sends <literal>EXTEND_TIMEOUT_USEC=…</literal>, this may cause
- the runtime to be extended beyond <varname>RuntimeMaxSec=</varname>. The first receipt of this message
- must occur before <varname>RuntimeMaxSec=</varname> is exceeded, and once the runtime has extended beyond
- <varname>RuntimeMaxSec=</varname>, the service manager will allow the service to continue to run, provided
- the service repeats <literal>EXTEND_TIMEOUT_USEC=…</literal> within the interval specified until the service
- shutdown is achieved by <literal>STOPPING=1</literal> (or termination). (see
+ <para>If a service of <varname>Type=notify</varname>/<varname>Type=notify-reload</varname> sends
+ <literal>EXTEND_TIMEOUT_USEC=…</literal>, this may cause the runtime to be extended beyond
+ <varname>RuntimeMaxSec=</varname>. The first receipt of this message must occur before
+ <varname>RuntimeMaxSec=</varname> is exceeded, and once the runtime has extended beyond
+ <varname>RuntimeMaxSec=</varname>, the service manager will allow the service to continue to run,
+ provided the service repeats <literal>EXTEND_TIMEOUT_USEC=…</literal> within the interval specified
+ until the service shutdown is achieved by <literal>STOPPING=1</literal> (or termination). (see
<citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>).
</para></listitem>
</varlistentry>
@@ -1023,16 +1045,19 @@
<varlistentry>
<term><varname>NotifyAccess=</varname></term>
<listitem><para>Controls access to the service status notification socket, as accessible via the
- <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry> call. Takes one
- of <option>none</option> (the default), <option>main</option>, <option>exec</option> or
- <option>all</option>. If <option>none</option>, no daemon status updates are accepted from the service
- processes, all status update messages are ignored. If <option>main</option>, only service updates sent from the
- main process of the service are accepted. If <option>exec</option>, only service updates sent from any of the
- main or control processes originating from one of the <varname>Exec*=</varname> commands are accepted. If
- <option>all</option>, all services updates from all members of the service's control group are accepted. This
- option should be set to open access to the notification socket when using <varname>Type=notify</varname> or
- <varname>WatchdogSec=</varname> (see above). If those options are used but <varname>NotifyAccess=</varname> is
- not configured, it will be implicitly set to <option>main</option>.</para>
+ <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ call. Takes one of <option>none</option> (the default), <option>main</option>, <option>exec</option>
+ or <option>all</option>. If <option>none</option>, no daemon status updates are accepted from the
+ service processes, all status update messages are ignored. If <option>main</option>, only service
+ updates sent from the main process of the service are accepted. If <option>exec</option>, only
+ service updates sent from any of the main or control processes originating from one of the
+ <varname>Exec*=</varname> commands are accepted. If <option>all</option>, all services updates from
+ all members of the service's control group are accepted. This option should be set to open access to
+ the notification socket when using
+ <varname>Type=notify</varname>/<varname>Type=notify-reload</varname> or
+ <varname>WatchdogSec=</varname> (see above). If those options are used but
+ <varname>NotifyAccess=</varname> is not configured, it will be implicitly set to
+ <option>main</option>.</para>
<para>Note that <function>sd_notify()</function> notifications may be attributed to units correctly only if
either the sending process is still around at the time PID 1 processes the message, or if the sending process
@@ -1156,6 +1181,15 @@
kills, this setting determines the state of the unit after <command>systemd-oomd</command> kills a
cgroup associated with it.</para></listitem>
</varlistentry>
+
+ <varlistentry>
+ <term><varname>ReloadSignal=</varname></term>
+ <listitem><para>Configures the UNIX process signal to send to the service's main process when asked
+ to reload the service's configuration. Defaults to <constant>SIGHUP</constant>. This option has no
+ effect unless <varname>Type=</varname><option>notify-reload</option> is used, see
+ above.</para></listitem>
+ </varlistentry>
+
</variablelist>
<para id='shared-unit-options'>Check
@@ -1319,16 +1353,13 @@ WantedBy=multi-user.target</programlisting>
<citerefentry><refentrytitle>systemd.kill</refentrytitle><manvolnum>5</manvolnum></citerefentry>
for details.</para>
- <para>Note that this unit type does not include any type of
- notification when a service has completed initialization. For
- this, you should use other unit types, such as
- <varname>Type=</varname><option>notify</option> if the service
- understands systemd's notification protocol,
- <varname>Type=</varname><option>forking</option> if the service
- can background itself or
- <varname>Type=</varname><option>dbus</option> if the unit
- acquires a DBus name once initialization is complete. See
- below.</para>
+ <para>Note that this unit type does not include any type of notification when a service has completed
+ initialization. For this, you should use other unit types, such as
+ <varname>Type=</varname><option>notify</option>/<varname>Type=</varname><option>notify-reload</option>
+ if the service understands systemd's notification protocol,
+ <varname>Type=</varname><option>forking</option> if the service can background itself or
+ <varname>Type=</varname><option>dbus</option> if the unit acquires a DBus name once initialization is
+ complete. See below.</para>
</example>
<example>
@@ -1505,15 +1536,12 @@ SystemdService=simple-dbus-service.service</programlisting>
<example>
<title>Services that notify systemd about their initialization</title>
- <para><varname>Type=</varname><option>simple</option> services
- are really easy to write, but have the major disadvantage of
- systemd not being able to tell when initialization of the given
- service is complete. For this reason, systemd supports a simple
- notification protocol that allows daemons to make systemd aware
- that they are done initializing. Use
- <varname>Type=</varname><option>notify</option> for this. A
- typical service file for such a daemon would look like
- this:</para>
+ <para><varname>Type=</varname><option>simple</option> services are really easy to write, but have the
+ major disadvantage of systemd not being able to tell when initialization of the given service is
+ complete. For this reason, systemd supports a simple notification protocol that allows daemons to make
+ systemd aware that they are done initializing. Use <varname>Type=</varname><option>notify</option> or
+ <varname>Type=</varname><option>notify-reload</option> for this. A typical service file for such a
+ daemon would look like this:</para>
<programlisting>[Unit]
Description=Simple notifying service