在systemd系统里man halt看到这么一句：
       Note that on many SysV systems halt used to be synonymous to poweroff, i.e. both commands would equally result in powering the machine off. systemd is more accurate here, and halt results in
       halting the machine only (leaving power on), and poweroff is required to actually power it off.

【 在 niuya 的大作中提到: 】
: 报告下进展，
: 亲测，昨晚用poweroff关机，今天没有启动，需要到机房开机。
: 等下次再有断电维护时，用halt试试。
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