以下脚本以Ubuntu 18.04为例.

1. 创建文件/etc/systemd/system/rc-local.service

[Unit]
 Description=/etc/rc.local Compatibility
 ConditionPathExists=/etc/rc.local

[Service]
 Type=forking
 ExecStart=/etc/rc.local start
 TimeoutSec=0
 StandardOutput=tty
 RemainAfterExit=yes

[Install]
 WantedBy=multi-user.target

2. 创建完文件/etc/rc.local之后，需要执行以下命令：

chown root:root /etc/rc.local
chmod 755 /etc/rc.local
systemctl enable rc-local.service