systemd.kill - Process killing procedure configuration
service.service, socket.socket, mount.mount,
Unit configuration files for services, sockets, mount points, swap devices and
scopes share a subset of configuration options which define the killing
procedure of processes belonging to the unit.
This man page lists the configuration options shared by these five
unit types. See systemd.unit(5) for the common options shared by all
unit configuration files, and systemd.service(5),
systemd.socket(5), systemd.swap(5), systemd.mount(5)
and systemd.scope(5) for more information on the configuration file
options specific to each unit type.
The kill procedure configuration options are configured in the
[Service], [Socket], [Mount] or [Swap] section, depending on the unit
Specifies how processes of this unit shall be killed. One
If set to control-group, all remaining processes in the
control group of this unit will be killed on unit stop (for services: after
the stop command is executed, as configured with ExecStop=). If set
to process, only the main process itself is killed. If set to
mixed, the SIGTERM signal (see below) is sent to the main
process while the subsequent SIGKILL signal (see below) is sent to
all remaining processes of the unit's control group. If set to none,
no process is killed. In this case, only the stop command will be executed
on unit stop, but no process will be killed otherwise. Processes remaining
alive after stop are left in their control group and the control group
continues to exist after stop unless it is empty.
Processes will first be terminated via SIGTERM (unless the
signal to send is changed via KillSignal= or
RestartKillSignal=). Optionally, this is immediately followed by a
SIGHUP (if enabled with SendSIGHUP=). If processes still
remain after the main process of a unit has exited or the delay configured
via the TimeoutStopSec= has passed, the termination request is
repeated with the SIGKILL signal or the signal specified via
FinalKillSignal= (unless this is disabled via the SendSIGKILL=
option). See kill(2) for more information.
Defaults to control-group.
Specifies which signal to use when stopping a service.
This controls the signal that is sent as first step of shutting down a unit
(see above), and is usually followed by SIGKILL
(see above and below).
For a list of valid signals, see signal(7)
. Defaults to SIGTERM
Note that, right after sending the signal specified in this
setting, systemd will always send SIGCONT, to ensure that even
suspended tasks can be terminated cleanly.
Specifies which signal to use when restarting a service.
The same as KillSignal= described above, with the exception that this
setting is used in a restart job. Not set by default, and the value of
KillSignal= is used.
Specifies whether to send SIGHUP to remaining
processes immediately after sending the signal configured with
KillSignal=. This is useful to indicate to shells and shell-like
programs that their connection has been severed. Takes a boolean value.
Defaults to "no".
Specifies whether to send SIGKILL (or the signal
specified by FinalKillSignal=) to remaining processes after a timeout,
if the normal shutdown procedure left processes of the service around. When
disabled, a KillMode= of control-group or mixed service
will not restart if processes from prior services exist within the control
group. Takes a boolean value. Defaults to "yes".
Specifies which signal to send to remaining processes
after a timeout if SendSIGKILL= is enabled. The signal configured here
should be one that is not typically caught and processed by services
(SIGTERM is not suitable). Developers can find it useful to use this to
generate a coredump to troubleshoot why a service did not terminate upon
receiving the initial SIGTERM signal. This can be achieved by
configuring LimitCORE= and setting FinalKillSignal= to either
SIGQUIT or SIGABRT Defaults to SIGKILL.
Specifies which signal to use to terminate the service
when the watchdog timeout expires (enabled through WatchdogSec=).
Defaults to SIGABRT.
systemd(1), systemctl(1), journalctl(1),
systemd.unit(5), systemd.service(5), systemd.socket(5),
systemd.swap(5), systemd.mount(5), systemd.exec(5),
systemd.directives(7), kill(2), signal(7)