升级到Debian9后，我们发现系统默认不带/etc/rc.local文件，但rc.local服务仍然保留
补齐缺失文件，让Debian9通过编辑/etc/rc.loacl文件为我们的服务添加开机自启动
1、添加rc-local.service
#以下为一整条命令，一起复制运行cat > /etc/systemd/system/rc-local.service <
[Unit]
Description=/etc/rc.local
ConditionPathExists=/etc/rc.local
[Service]
Type=forking
ExecStart=/etc/rc.local start
TimeoutSec=0StandardOutput=tty
RemainAfterExit=yes
SysVStartPriority=99
[Install]
WantedBy=multi-user.target
EOF
2、新建rc-local文件
#以下为一整条命令，一起复制运行cat > /etc/rc.local <
#!/bin/sh -e
#
# rc.local#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other# value on error.
#
# In order to enable or disable this script just change the execution# bits.#
# By default this script does nothing.
#
exit 0
EOF
3、添加权限并设置开机自启chmod +x /etc/rc.local
systemctl enable rc-local
systemctl start rc-local.service
检查状态：systemctl status rc-local.service
返回Active:active信息，则成功。
最后我们就可以在/etc/rc.local里，添加开机的自启命令什么的了。记住添加在exit 0之前。
注意：更改自启脚本后，需要重新运行一下命令已使其生效。systemctl enable rc-local
systemctl start rc-local.service
