rc.local is deprecated in debian 9 by default
To enable it
- create file /etc/systemd/system/multi-user.target.wants/rc.local.service
vi /etc/systemd/system/multi-user.target.wants/rc.local.service
[Unit]
Description=/etc/rc.local
ConditionPathExists=/etc/rc.local
[Service]
Type=forking
ExecStart=/etc/rc.local start
TimeoutSec=0
StandardOutput=tty
RemainAfterExit=yes
SysVStartPriority=99
[Install]
WantedBy=multi-user.target
2. #systemctl daemon-reload
3. #systemcl restart rc.local.service