ubuntu18.04不再使用initd管理系统，改用systemd。
然而systemd很难用，改变太大，跟之前的完全不同。
查看是否存在这个文件:
cat /lib/systemd/system/rc.local.service
查看服务状态:
sudo systemctl status rc-local
创建/etc/rc.local文件:
sudo cat <<EOF > /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
设置可执行权限:
sudo chmod +x /etc/rc.local
启动服务
systemctl start rc-local
查看服务状态
systemctl status rc-local