#  SPDX-License-Identifier: LGPL-2.1+
#
#  This file is part of systemd.
#
#  systemd is free software; you can redistribute it and/or modify it
#  under the terms of the GNU Lesser General Public License as published by
#  the Free Software Foundation; either version 2.1 of the License, or
#  (at your option) any later version.
# This unit gets pulled automatically into multi-user.target by
# systemd-rc-local-generator if /etc/rc.local is executable.
[Unit]
Description=/etc/rc.local Compatibility
Documentation=man:systemd-rc-local-generator(8)
ConditionFileIsExecutable=/etc/rc.local
After=network.target
[Service]
Type=forking
ExecStart=/etc/rc.local start
TimeoutSec=0
RemainAfterExit=yes
GuessMainPID=no
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• 一般正常的启动文件主要分成三部分
  [Unit] 段: 启动顺序与依赖关系
  [Service] 段: 启动行为,如何启动，启动类型
  [Install] 段: 定义如何安装这个配置文件，即怎样做到开机启动
• 可以看出，rc.local.service 它少了 Install 段，也就没有定义如何做到开机启动，所以显然这样配置是无效的。 因此我们就需要在后面帮他加上 [Install] 段，可以发现rc.local.service是rc-local.service文件的链接文件，所以我们只需要修改rc-local.service文件即可：

[Install]  
WantedBy=multi-user.target 

Alias=rc-local.service
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操作步骤

• 在/lib/systemd/system/rc-local.service 文件中添加如下代码：

[Install] 

WantedBy=multi-user.target 

Alias=rc-local.service
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• 在/etc/目录下面创建rc.local文件，赋予执行权限，

root@dyjc-bmg:/home/vagrant# touch /etc/rc.local
root@dyjc-bmg:/home/vagrant# chmod +x /etc/rc.local
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• /etc/rc.local 文件添加如下内容：

#!/bin/sh -e
#

rc.local
#
This script is executed at the end of each multiuser runlevel.
Make sure that the script will "exit 0" on success or any other
value on error.
#
In order to enable or disable this script just change the execution
bits.
#
By default this script does nothing.
exit 0
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• systemd 默认读取 /etc/systemd/system 下的配置文件，将/lib/systemd/system/rc.local.service 链接到/etc/systemd/system目录

root@dyjc-bmg:/home/vagrant# ln -s /lib/systemd/system/rc.local.service /etc/systemd/system/
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注意: 一定要将命令添加在 exit 0之前