¿Cómo se escribe un servicio systemd que se cierra correctamente al apagar o reiniciar la máquina? En particular, debería retrasar el apagado de la máquina hasta que salga correctamente.
Tengo un servicio que tarda 10 segundos en cerrarse: /usr/local/bin/shutdowntest.sh:
#!/bin/bash
SHUTDOWN=0
SHUTDOWN_TIME=10
TRAPPED_SIGNAL=
function onexit() {
TRAPPED_SIGNAL=$1
SHUTDOWN=1
}
for SIGNAL in SIGINT SIGTERM SIGHUP SIGPIPE SIGALRM SIGUSR1 SIGUSR2; do
trap "onexit $SIGNAL" $SIGNAL
done
echo >&2 "shutdowntest running"
while ((!SHUTDOWN || SHUTDOWN_TIME>0)); do
if [[ -n "$TRAPPED_SIGNAL" ]]; then
echo >&2 "shutdowntest received signal $TRAPPED_SIGNAL"
TRAPPED_SIGNAL=
elif ((SHUTDOWN)); then
echo >&2 "shutdowntest Shutting down: $SHUTDOWN_TIME more sleeps"
SHUTDOWN_TIME=$((SHUTDOWN_TIME-1))
sleep 1
else
sleep 10
fi
done
echo >&2 "shutdowntest Finished shutting down; quitting"
Configuré TimeoutStopSec en 15 segundos en /etc/systemd/system/shutdowntest.service:
[Service]
ExecStart=/usr/local/bin/shutdowntest.sh
TimeoutStopSec=15
[Install]
WantedBy=multi-user.target
Cuando lo ejecuto sudo systemctl stop shutdowntest.service, el servicio se cierra correctamente de acuerdo con /var/log/syslog:
00:57:11 shutdowntest.sh[1980]: shutdowntest received signal SIGTERM
00:57:11 shutdowntest.sh[1980]: shutdowntest Shutting down: 10 more sleeps
00:57:11 systemd[1]: Stopping shutdowntest.service...
00:57:11 shutdowntest.sh[1980]: Terminated
00:57:11 shutdowntest.sh[1980]: shutdowntest Shutting down: 9 more sleeps
00:57:12 shutdowntest.sh[1980]: shutdowntest Shutting down: 8 more sleeps
00:57:13 shutdowntest.sh[1980]: shutdowntest Shutting down: 7 more sleeps
00:57:14 shutdowntest.sh[1980]: shutdowntest Shutting down: 6 more sleeps
00:57:15 shutdowntest.sh[1980]: shutdowntest Shutting down: 5 more sleeps
00:57:16 shutdowntest.sh[1980]: shutdowntest Shutting down: 4 more sleeps
00:57:17 shutdowntest.sh[1980]: shutdowntest Shutting down: 3 more sleeps
00:57:18 shutdowntest.sh[1980]: shutdowntest Shutting down: 2 more sleeps
00:57:19 shutdowntest.sh[1980]: shutdowntest Shutting down: 1 more sleeps
00:57:20 shutdowntest.sh[1980]: shutdowntest Finished shutting down; quitting
00:57:20 systemd[1]: Stopped shutdowntest.service.
Pero cuando yo sudo rebooto sudo shutdown nowla máquina, el servicio finaliza sin tiempo suficiente para salir correctamente, y /var/log/syslog finaliza solo 1 segundo después.
00:59:30 shutdowntest.sh[2014]: Terminated
00:59:30 shutdowntest.sh[2014]: shutdowntest received signal SIGTERM
00:59:30 shutdowntest.sh[2014]: shutdowntest Shutting down: 10 more sleeps
00:59:30 systemd[1]: Stopping shutdowntest.service...
¿Cómo garantizar que el servicio tenga el tiempo ( TimeoutSeco TimeoutStopSec) para salir cuando la máquina se apaga o reinicia?
Respuesta1
Elcomentario de bigones correcto. Estaba mirando /var/log/syslog, pero esto está escrito por rsyslog.service, y systemd se detiene bastante temprano en el proceso de apagado (como se indica en "Servicio de registro del sistema detenido" a continuación).
Después de habilitar el registro diario persistente ( Storage=persistenten /etc/systemd/journald.confy systemctl restart systemd-journald), journalctl -b-1 -u shutdowntest.servicemuestra que mi servicio tiene tiempo suficiente para apagarse después de que se rebootejecuta el sistema shutdowno después de presionar la tecla Encendido (ACPI G2 Soft Off).
journalctl -b-1 -u shutdowntest.service -u rsyslog.service -u systemd-logind
-- Logs begin at Mon 2018-03-26 18:39:12 UTC, end at Mon 2018-03-26 20:22:34 UTC. --
…
Mar 26 18:46:46 myhost systemd-logind[1202]: Power key pressed.
Mar 26 18:46:46 myhost systemd-logind[1202]: Powering Off...
Mar 26 18:46:46 myhost systemd-logind[1202]: System is powering down.
Mar 26 18:46:46 myhost shutdowntest.sh[1237]: Terminated
Mar 26 18:46:46 myhost shutdowntest.sh[1237]: shutdowntest received signal SIGTERM
Mar 26 18:46:46 myhost shutdowntest.sh[1237]: shutdowntest Shutting down: 10 more sleeps
Mar 26 18:46:46 myhost systemd[1]: Stopping shutdowntest.service...
Mar 26 18:46:46 myhost systemd[1]: Stopping Login Service...
Mar 26 18:46:46 myhost systemd[1]: Stopped Login Service.
Mar 26 18:46:46 myhost systemd[1]: Stopping System Logging Service...
Mar 26 18:46:47 myhost systemd[1]: Stopped System Logging Service.
Mar 26 18:46:47 myhost shutdowntest.sh[1237]: shutdowntest Shutting down: 9 more sleeps
Mar 26 18:46:48 myhost shutdowntest.sh[1237]: shutdowntest Shutting down: 8 more sleeps
Mar 26 18:46:49 myhost shutdowntest.sh[1237]: shutdowntest Shutting down: 7 more sleeps
Mar 26 18:46:50 myhost shutdowntest.sh[1237]: shutdowntest Shutting down: 6 more sleeps
Mar 26 18:46:51 myhost shutdowntest.sh[1237]: shutdowntest Shutting down: 5 more sleeps
Mar 26 18:46:52 myhost shutdowntest.sh[1237]: shutdowntest Shutting down: 4 more sleeps
Mar 26 18:46:53 myhost shutdowntest.sh[1237]: shutdowntest Shutting down: 3 more sleeps
Mar 26 18:46:54 myhost shutdowntest.sh[1237]: shutdowntest Shutting down: 2 more sleeps
Mar 26 18:46:55 myhost shutdowntest.sh[1237]: shutdowntest Shutting down: 1 more sleeps
Mar 26 18:46:56 myhost shutdowntest.sh[1237]: shutdowntest Finished shutting down; quitting
Mar 26 18:46:56 myhost systemd[1]: Stopped shutdowntest.service.