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等待服务正常退出，然后再关闭/重启机器

tag-icon • tag-icon systemd
等待服务正常退出，然后再关闭/重启机器

如何编写一个 systemd 服务，让它在机器关机或重启时正常关闭？具体来说，它应该延迟机器关机，直到正常退出。

我有一个需要10秒才能关闭的服务：/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"

我在 /etc/systemd/system/shutdowntest.service 中将 TimeoutStopSec 设置为 15 秒：

[Service]
ExecStart=/usr/local/bin/shutdowntest.sh
TimeoutStopSec=15

[Install]
WantedBy=multi-user.target

当我运行时sudo systemctl stop shutdowntest.service，服务会按照以下步骤正常关闭/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.

但是当我sudo reboot或sudo shutdown now机器时，服务被杀死而没有足够的时间正常退出，并且 /var/log/syslog 仅在 1 秒后结束。

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...

如何确保在机器关机或重启时给服务一个退出的时间（TimeoutSec或）？TimeoutStopSec

答案1

这Bigon 的评论是正确的。我查看了/var/log/syslog，但这是由编写的rsyslog.service，systemd 在关闭过程中很早就停止了（如下面“停止的系统日志服务”所示）。

在我启用持久日志记录后（Storage=persistent在/etc/systemd/journald.conf和中systemctl restart systemd-journald），显示在系统启动后或按下电源键（ACPI G2 软关闭）后，journalctl -b-1 -u shutdowntest.service我的服务确实有足够的时间关闭。rebootshutdown

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.

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