Systemd

archlinux Wiki
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root

• systemctl = systemctl –system
• systemctl enable NetworkManager = systemctl –system enable NetworkManager
• systemctl enable sshd = systemctl enable sshd –system
• systemctl enable update-system.timer = systemctl –system enable update-system.timer

poweroff

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systemctl poweroff

reboot

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systemctl reboot

Show system status

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systemctl status

List running units

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systemctl
systemctl list-units

List failed units

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systemctl --failed

List installed unit files

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systemctl list-unit-files

not root

参考archlinux wiki
offers the ability to manage services under the user’s control with a per-user systemd instance,enabling them to start, stop, enable, and disable their own user units
systemctl –user Connect to user service manager

• systemctl –user enable mpd
• systemctl –user start mpd

systemd/Timers

There are many cron implementations, but none of them are installed by default as the base system uses systemd/Timers instead.
archlinux Wiki
systemd.timer
systemd.time 执行时间策略 \ systemd.exec

file path

• /etc/systemd/system/update-system.timer
• /etc/systemd/system/update-system.service

update-system.timer

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[Unit]
Description=update system weekly

[Timer]
OnCalendar= Fri *-*-* 12:00:00

[Install]
WantedBy=timers.target

update-system.service

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[Unit]
Description=update system weekly

[Service]
ExecStart=pacman -S -y --noconfirm -u

查看定时任务

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systemctl list-timers
systemctl list-timers --all

开机激活定时器

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systemctl enable update-system.timer

取消开机激活定时器

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systemctl disable update-system.timer

手动激活定时器

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systemctl start update-system.timer

手动停止定时器

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systemctl stop update-system.timer

查看定时器状态

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systemctl status update-system.timer

OnCalendar

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systemd-analyze calendar weekly
systemd-analyze calendar "Mon *-*-* 00:00:00"

注意 / 仅用于月份