VBoxManage

install vnc server

http://wiki.hawkguide.com/wiki/Vnc_server

Install VBOX

sudo apt-get install virtualbox

VBoxManage

first need to install extension pack https://www.virtualbox.org/wiki/Download_Old_Builds_6_1

VBoxManage controlvm
# list vms 
VBoxManage list vms
# show detail
vboxmanage showvminfo "my-ubuntu" 

# power off
VBoxManage controlvm my-ubuntu poweroff

# start headless
VBoxManage startvm my-ubuntu --type headless

# set auto restart 
# setup auto start first
https://askubuntu.com/questions/404665/how-to-start-virtual-box-machines-automatically-when-booting
# if you see error VERR_ACCESS_DENIED, tun this
sudo touch /etc/vbox/${USER}.start
sudo chgrp vboxusers /etc/vbo
sudo chmod 1775 /etc/vbox
sudo chmod 777 /etc/vbox/${USER}.start
VBoxManage modifyvm <uuid|vmname> --autostart-enabled on

To make vboxautostart-service.service work, you need to disable SELinux

sudo setenforce 0
vim /etc/selinux/config
# change to SELINUX=permissive