SYSTEMD-NOTIFY(1) systemd-notify SYSTEMD-NOTIFY(1)
NAME
systemd-notify - Notify service manager about start-up completion and
other daemon status changes
SYNOPSIS
systemd-notify [OPTIONS...] [VARIABLE=VALUE...]
DESCRIPTION
systemd-notify may be called by daemon scripts to notify the init
system about status changes. It can be used to send arbitrary
information, encoded in an environment-block-like list of strings. Most
importantly it can be used for start-up completion notification.
This is mostly just a wrapper around sd_notify() and makes this
functionality available to shell scripts. For details see sd_notify(3).
The command line may carry a list of environment variables to send as
part of the status update.
Note that systemd will refuse reception of status updates from this
command unless NotifyAccess=all is set for the service unit this
command is called from.
OPTIONS
The following options are understood:
--ready
Inform the init system about service start-up completion. This is
equivalent to systemd-notify READY=1. For details about the
semantics of this option see sd_notify(3).
--pid=
Inform the init system about the main PID of the daemon. Takes a
PID as argument. If the argument is omitted, the PID of the process
that invoked systemd-notify is used. This is equivalent to
systemd-notify MAINPID=$PID. For details about the semantics of
this option see sd_notify(3).
--uid=USER
Set the user ID to send the notification from. Takes a UNIX user
name or numeric UID. When specified the notification message will
be sent with the specified UID as sender, in place of the user the
command was invoked as. This option requires sufficient privileges
in order to be able manipulate the user identity of the process.
--status=
Send a free-form status string for the daemon to the init systemd.
This option takes the status string as argument. This is equivalent
to systemd-notify STATUS=.... For details about the semantics of
this option see sd_notify(3).
--booted
Returns 0 if the system was booted up with systemd, non-zero
otherwise. If this option is passed, no message is sent. This
option is hence unrelated to the other options. For details about
the semantics of this option, see sd_booted(3).
--readahead=
Controls disk read-ahead operations. The argument must be a string,
and either "cancel", "done" or "noreplay". For details about the
semantics of this option see sd_readahead(3).
-h, --help
Print a short help text and exit.
--version
Print a short version string and exit.
EXIT STATUS
On success, 0 is returned, a non-zero failure code otherwise.
EXAMPLE
Example 1. Start-up Notification and Status Updates
A simple shell daemon that sends start-up notifications after having
set up its communication channel. During runtime it sends further
status updates to the init system:
#!/bin/bash
mkfifo /tmp/waldo
systemd-notify --ready --status="Waiting for data..."
while : ; do
read a < /tmp/waldo
systemd-notify --status="Processing $a"
# Do something with $a ...
systemd-notify --status="Waiting for data..."
done
SEE ALSO
systemd(1), systemctl(1), systemd.unit(5), sd_notify(3), sd_booted(3)
systemd 219 SYSTEMD-NOTIFY(1)