Ubuntu 18.04 rc.local systemd设置

ln -fs /lib/systemd/system/rc-local.service /etc/systemd/system/rc-local.service  

vim /etc/systemd/system/rc-local.service 

#  SPDX-License-Identifier: LGPL-2.1+  
#  
#  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.local is executable.  
[Unit]  
Description=/etc/rc.local Compatibility  
Documentation=man:systemd-rc-local-generator(8)  
ConditionFileIsExecutable=/etc/rc.local  
After=network.target  

[Service]  
Type=forking  
ExecStart=/etc/rc.local start  
TimeoutSec=0  
RemainAfterExit=yes  
GuessMainPID=no  

[Install]  
WantedBy=multi-user.target  
Alias=rc-local.service 

touch /etc/rc.local 
chmod 755 /etc/rc.local 

#!/bin/bash  

echo "test rc " > /var/test.log