Reference from: https: //www.cnblogs.com/qingshangucheng/p/10183583.html
Principle: systemd will automatically read / etc configuration files in / systemd / system (as I understand is to execute all executable files in the folder)
And there is a rc.local.service file in / lib / systemd / system, edit it (need to increase the [Install] section to boot from Kai), and make it a soft link, into the / etc / systemd / system down , which instruction execution /etc/rc.local file.
So, edit /etc/rc.local file, put the commands you want to boot, you can.
Test it, rc.local file so that in turn generated automatically generated, so this approach should be feasible.