rc.local.service 找不到

根据 【Linux关闭swap】 编写 开机脚本 /etc/rc.local 后，执行 sudo systemctl enable rc-local 时提示如下异常：

Failed to restart rc.local.service: Unit rc.local.service not found.

解决方案：

之前执行的 systemctl 命令中的rc.local，需换成 rc-local，可能提示需安装。其具体过程如下

1. 链接文件 rc-local.service

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# 将 /lib/systemd/system/rc-local.service 链接到 /etc/systemd/system/ 目录下面来
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ln -fs /lib/systemd/system/rc-local.service /etc/systemd/system/rc-local.service

查看 /etc/systemd/system/rc-local.service 文件：

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[Unit]
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Description=/etc/rc.local Compatibility
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Documentation=man:systemd-rc-local-generator(8)
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ConditionFileIsExecutable=/etc/rc.local
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After=network.target
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[Service]
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Type=forking
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ExecStart=/etc/rc.local start
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TimeoutSec=0
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RemainAfterExit=yes
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GuessMainPID=no

此时再执行 sudo systemctl enable rc-local 将出现如下提示：

The unit files have no installation config (WantedBy=, RequiredBy=, Also=, Alias= settings in the [Install] section, and DefaultInstance= for template units). This means they are not meant to be enabled using systemctl.

Possible reasons for having this kind of units are: • A unit may be statically enabled by being symlinked from another unit’s .wants/ or .requires/ directory. • A unit’s purpose may be to act as a helper for some other unit which has a requirement dependency on it. • A unit may be started when needed via activation (socket, path, timer, D-Bus, udev, scripted systemctl call, …). • In case of template units, the unit is meant to be enabled with some instance name specified.

2. 编辑文件 rc-local.service，新增配置

执行如下操作 sudo vi /etc/systemd/system/rc-local.service 新增：

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[Install]
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 WantedBy=multi-user.target

之后再执行 sudo systemctl enable rc-local 得到提示：

Created symlink /etc/systemd/system/multi-user.target.wants/rc-local.service → /lib/systemd/system/rc-local.service.

此时可成功只执行 sudo systemctl restart rc-local 。