Occasionally when rebooting my machine, VirtualBox would fail to start up correctly. They changed the command to restart it once moving to OS X Mavericks, so I’m just recording here the new command:
sudo /Library/Application\ Support/VirtualBox/LaunchDaemons/VirtualBoxStartup.sh restart
I made a command in my local
~/bin/ directly called
~/bin/virtualbox_restart so I could easily restart if needed.