1、systemctl list-units 列出當前系統服務及狀態
2、systemctl list-dependencies servicename 查看指定服務的依賴關係
3、systemctl systemd-networkd status 查看服務狀態
4、systemctl start /stop/restart/enable/disable servicename 啓動/重啓/開機啓用/開機停用
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# 查看啓動耗時$ systemd-analyze
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# 查看每個服務的啓動耗時$ systemd-analyze blame
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# 顯示瀑布狀的啓動過程流$ systemd-analyze critical-chain
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# 顯示指定服務的啓動流$ systemd-analyze critical-chain atd.service