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   systemd    ( 1 )

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Сигналы (Signals)

SIGTERM Upon receiving this signal the systemd system manager serializes its state, reexecutes itself and deserializes the saved state again. This is mostly equivalent to systemctl daemon-reexec.

systemd user managers will start the exit.target unit when this signal is received. This is mostly equivalent to systemctl --user start exit.target --job-mode=replace-irreversibly.

SIGINT Upon receiving this signal the systemd system manager will start the ctrl-alt-del.target unit. This is mostly equivalent to systemctl start ctrl-alt-del.target --job-mode=replace-irreversibly. If this signal is received more than 7 times per 2s, an immediate reboot is triggered. Note that pressing Ctrl+Alt+Del on the console will trigger this signal. Hence, if a reboot is hanging, pressing Ctrl+Alt+Del more than 7 times in 2 seconds is a relatively safe way to trigger an immediate reboot.

systemd user managers treat this signal the same way as SIGTERM.

SIGWINCH When this signal is received the systemd system manager will start the kbrequest.target unit. This is mostly equivalent to systemctl start kbrequest.target.

This signal is ignored by systemd user managers.

SIGPWR When this signal is received the systemd manager will start the sigpwr.target unit. This is mostly equivalent to systemctl start sigpwr.target.

SIGUSR1 When this signal is received the systemd manager will try to reconnect to the D-Bus bus.

SIGUSR2 When this signal is received the systemd manager will log its complete state in human-readable form. The data logged is the same as printed by systemd-analyze dump.

SIGHUP Reloads the complete daemon configuration. This is mostly equivalent to systemctl daemon-reload.

SIGRTMIN+0 Enters default mode, starts the default.target unit. This is mostly equivalent to systemctl isolate default.target.

SIGRTMIN+1 Enters rescue mode, starts the rescue.target unit. This is mostly equivalent to systemctl isolate rescue.target.

SIGRTMIN+2 Enters emergency mode, starts the emergency.service unit. This is mostly equivalent to systemctl isolate emergency.service.

SIGRTMIN+3 Halts the machine, starts the halt.target unit. This is mostly equivalent to systemctl start halt.target --job-mode=replace-irreversibly.

SIGRTMIN+4 Powers off the machine, starts the poweroff.target unit. This is mostly equivalent to systemctl start poweroff.target --job-mode=replace-irreversibly.

SIGRTMIN+5 Reboots the machine, starts the reboot.target unit. This is mostly equivalent to systemctl start reboot.target --job-mode=replace-irreversibly.

SIGRTMIN+6 Reboots the machine via kexec, starts the kexec.target unit. This is mostly equivalent to systemctl start kexec.target --job-mode=replace-irreversibly.

SIGRTMIN+13 Immediately halts the machine.

SIGRTMIN+14 Immediately powers off the machine.

SIGRTMIN+15 Immediately reboots the machine.

SIGRTMIN+16 Immediately reboots the machine with kexec.

SIGRTMIN+20 Enables display of status messages on the console, as controlled via systemd.show_status=1 on the kernel command line.

SIGRTMIN+21 Disables display of status messages on the console, as controlled via systemd.show_status=0 on the kernel command line.

SIGRTMIN+22 Sets the service manager's log level to "debug", in a fashion equivalent to systemd.log_level=debug on the kernel command line.

SIGRTMIN+23 Restores the log level to its configured value. The configured value is derived from – in order of priority – the value specified with systemd.log-level= on the kernel command line, or the value specified with LogLevel= in the configuration file, or the built-in default of "info".

SIGRTMIN+24 Immediately exits the manager (only available for --user instances).

SIGRTMIN+25 Upon receiving this signal the systemd manager will reexecute itself. This is mostly equivalent to systemctl daemon-reexec except that it will be done asynchronously.

The systemd system manager treats this signal the same way as SIGTERM.

SIGRTMIN+26 Restores the log target to its configured value. The configured value is derived from – in order of priority – the value specified with systemd.log-target= on the kernel command line, or the value specified with LogTarget= in the configuration file, or the built-in default.

SIGRTMIN+27, SIGRTMIN+28 Sets the log target to "console" on SIGRTMIN+27 (or "kmsg" on SIGRTMIN+28), in a fashion equivalent to systemd.log_target=console (or systemd.log_target=kmsg on SIGRTMIN+28) on the kernel command line.