假设需要开机启动的脚本为/root/start.sh。

## 添加执行权限
chmod +x start.sh

添加start.sh到开机自动执行，修改文件vi /etc/rc.d/rc.local，在该文件的末尾加入开机启动脚本的命令：

[root@localhost ~]# cat /etc/rc.d/rc.local
#!/bin/bash
## THIS FILE IS ADDED FOR COMPATIBILITY PURPOSES
#
## It is highly advisable to create own systemd services or udev rules
## to run scripts during boot instead of using this file.
#
## In contrast to previous versions due to parallel execution during boot
## this script will NOT be run after all other services.
#
## Please note that you must run 'chmod +x /etc/rc.d/rc.local' to ensure
## that this script will be executed during boot.

touch /var/lock/subsys/local
## 下面是新添加
/root/start.sh

添加执行权限给rc.local：

chmod +x /etc/rc.d/rc.local

执行命令使rc.local文件生效：

systemctl enable rc-local

最后重启服务器：reboot，查看脚本是否自启动成功。