1.权限设置（/etc/rc.local和/etc/rc.d/rc.local都需要赋予执行权限）
chmod +x /etc/rc.d
chmod +x /etc/rc.d/rc.local
2.设置服务启动脚本。 1）进入路径
cd /usr/lib/systemd/system
2）编辑服务脚本
vi rc-local.service
删除之前的所有数据，导入以下数据。
##This file is part of systemd.
#systemd is free software; you can redistribute it and/or modify it
#under the terms of the GNU Lesser General Public License as published by
#the Free Software Foundation; either version 2.1 of the License, or
#(at your option) any later version.
#This unit gets pulled automatically into multi-user.target by
#systemd-rc-local-generator if /etc/rc.d/rc.local is executable.
[Unit]
Description=/etc/rc.d/rc.local Compatibility
ConditionFileIsExecutable=/etc/rc.d/rc.local
After=network.target
[Service]
Type=forking
ExecStart=/etc/rc.d/rc.local start
TimeoutSec=0
RemainAfterExit=yes
SysVStartPriority=99
[Install]
WantedBy=multi-user.target
3.使用命令启动服务（确认服务可用）
systemctl start rc-local
使用systemctl -t service查看服务器所有服务的状态,确认服务rc-local.service是否运行正常. 4.执行systemctl enable rc-local
systemctl enable rc-local
出现以下提示表示成功添加开机自启动：
Created symlink from /etc/systemd/system/multi-user.target.wants/rc-local.service to /usr/lib/systemd/system/rc-local.service.
如下图：
完成以上步骤就可以将开机自动执行的命令写入/etc/rc.d/rc.local中，实现开机自动执行。
