rc.d/rc.local简介
/etc/rc.local 是 /etc/rc.d/rc.local的软连接（系统安装时根据/etc/rc.d/rc.local生成的）
所以开机自启实际上是执行/etc/rc.d/rc.local这个文件（该文件需要可执行权限，文件头为 #!/bin/bash）
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| [root /]# ls -l /etc/rc.local
lrwxrwxrwx 1 root root 13 Aug 24 2021 /etc/rc.local -> rc.d/rc.local
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问题一：rc.d/rc.loacl无法执行
一般来说，造成这种情况的是由于该文件没有可执行权限
下面来说下不一般的
首先看看有没有rc.local这个服务
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| systemctl list-unit-files|grep rc.local
rc-local.service static
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再看看rc.local服务的状态
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| systemctl status rc-local.service
● rc-local.service - /etc/rc.d/rc.local Compatibility
Loaded: loaded (/usr/lib/systemd/system/rc-local.service; static; vendor preset: disabled)
Active: failed (Result: exit-code) since Thu 2022-06-30 14:39:40 CST; 7min ago
Process: 1074 ExecStart=/etc/rc.d/rc.local start (code=exited, status=203/EXEC)
Jun 30 14:39:39 cac8821bbb6ae2bd3553cc0552e923ddXX systemd[1]: Starting /etc/rc.d/rc.local Compatibility...
Jun 30 14:39:40 cac8821bbb6ae2bd3553cc0552e923ddXX systemd[1]: rc-local.service: control process exited, code=exited status=203
Jun 30 14:39:40 cac8821bbb6ae2bd3553cc0552e923ddXX systemd[1]: Failed to start /etc/rc.d/rc.local Compatibility.
Jun 30 14:39:40 cac8821bbb6ae2bd3553cc0552e923ddXX systemd[1]: Unit rc-local.service entered failed state.
Jun 30 14:39:40 cac8821bbb6ae2bd3553cc0552e923ddXX systemd[1]: rc-local.service failed.
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很显然，服务启动失败
一般来说服务组件是没问题的，那么我们检查下/etc/rc.d/rc.local文件，看看是不是该文件格式不正确
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| cat /etc/rc.d/rc.local
/bin/bash /s.sh
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果然，少了#!/bin/bash作为第一行
加上后就OK了
参考：树莓派：【FAILED】 Failed to start /etc/rc.local Compatibility.