Virtualization is great! It allows me to mess up with my Jenkins setup trying to figure out how to configure iOS jobs with tests (jumping through a number of hoops on the way, hi Apple!). One point though is that the guest OS X in VirtualBox has terribly slow graphics, and also freezes after some time. Only restart helps. Hopefully, I usually need
jenkins web interface only. Read about how to set that up here: Jenkins in OSX guest in VirtualBox for iOS jobs – full setup guide.
Anyway, due to missing VBox additions on OSX guest, time doesn’t update when the machine is suspended and then resumed. Plus, there is a constant time drift. Explanations here: https://forums.virtualbox.org/viewtopic.php?f=22&t=48233.