我有以下新贵工作：
# hwclock - adjust system clock and timezone
#
# The hwclock task adjusts the system clock when the hardware clock is
# set to localtime (e.g. when dual-booting with Windows), and also
# ensures that the system timezone is set so that timestamps are written
# to FAT devices.
description "adjust system clock and timezone"
start on starting mountall
task
script
exec hwclock --systz --utc --noadjfile
end script
我想将其切换到 systemd 服务。
在systemd上应该如何start on starting mountall实现？
我创建了 systemd 服务，如下所示，但我不知道该怎么做start on starting mountall。
[Unit]
Description=hwclock
After=
Before=
[Service]
ExecStart=/sbin/hwclock --systz --utc --noadjfile
答案1
您将需要这些行：
Requires=
After=
正如这里所述：
Requires=：该指令列出了该单元本质上依赖的所有单元。如果当前单位已激活，则此处列出的单位也必须成功激活，否则该单位将失败。默认情况下，这些单元与当前单元并行启动。
After=：该指令中列出的单元将在启动当前单元之前启动。这并不意味着依赖关系，如果需要，必须通过上述指令建立依赖关系。
结构应该是：
[Unit]
Description=hwclock
Requires= # mountall most happen
After= # mountall should have started before hwclock run
[Service]
Type=oneshort
ExecStart=/sbin/hwclock --systz --utc --noadjfile
从这里:
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Upstart stanza | systemd unit file directive | systemd unit file section
| |
-------------------------------------------------------------------------
start on | Wants, Requires, Before, |
| After | Unit
--------------------------------------------------------------------------
注意：这是针对 Ubuntu 系统的，但应该类似。看：https://www.freedesktop.org/software/systemd/man/systemd.unit.html还。