[Linux] How to set up booting when there is no rc.local file

How to set up startup without rc.local file

# ls /etc/rc.local
ls: 无法访问'/etc/rc.local': 没有那个文件或目录

In this case, you need to follow the configuration below to make it take effect

Create rc.local

# touch /etc/rc.local 
# chmod +x /etc/rc.local

Add a command to be executed on boot

# vi /etc/rc.local
#!/bin/bash -e 
echo 666 > /tmp/test.txt   ## 随便创建一个文件，作为验证文件。

View rc-local process status

# systemctl  status rc-local
● rc-local.service - /etc/rc.local Compatibility
   Loaded: loaded (/lib/systemd/system/rc-local.service; static; vendor preset: enabled)
  Drop-In: /usr/lib/systemd/system/rc-local.service.d
           └─debian.conf
   Active: inactive (dead)
     Docs: man:systemd-rc-local-generator(8)
 
## 启动rc.local
# systemctl enable rc-local --now
# systemctl status rc-local
● rc-local.service - /etc/rc.local Compatibility
   Loaded: loaded (/lib/systemd/system/rc-local.service; static; vendor preset: enabled)
  Drop-In: /usr/lib/systemd/system/rc-local.service.d
           └─debian.conf
   Active: active (exited) since Fri 2022-11-11 14:53:05 CST; 5s ago
     Docs: man:systemd-rc-local-generator(8)
  Process: 13830 ExecStart=/etc/rc.local start (code=exited, status=0/SUCCESS)

11月 11 14:53:05 zclinux systemd[1]: Starting /etc/rc.local Compatibility...
11月 11 14:53:05 zclinux systemd[1]: Started /etc/rc.local Compatibility.

Try restarting (use with caution in production)

# reboot

verify

# cat /tmp/test.txt
666