[vbox-dev] [PROPOSAL] Userdata Interface

Alex Crawford alex.crawford at coreos.com
Thu Sep 15 15:34:53 GMT 2016

On 09/15, Klaus Espenlaub wrote:
> On 15.09.2016 09:12, Ivo Smits wrote:
> >
> > VirtualBox has Guest Properties, which I think are very similar to 
> > VMware's GuestVariables. You can use Guest Properties via the command 
> > line: https://forums.virtualbox.org/viewtopic.php?t=10823
> >
> > Or via the COM API: 
> > https://www.virtualbox.org/sdkref/interface_i_machine.html#a9f2fffade4b897eb659cc4602694676d
> >
> Right, Guest Properties sounds like a suitable mechanism. It has 
> reasonably high limits (can easily handle several 100KB), and handles 
> anything which is valid UTF-8. Don't try to abuse it as a way to pass 
> binary data directly, because then you'll run into 'random' failures 
> when the UTF-8 validation sets off the alarm. Oh, and if you pass large 
> data it's probably a good idea to mark the guest property as transient 
> so that it doesn't cause VM settings bloat.

Yes, this is exactly the functionality I need. I don't understand how I
could have missed this in the docs... Thank you for pointing this out.

> > On the guest side you'll probably need the VirtualBox Guest Additions 
> > including its kernel module to be able to access the properties.
> >
> Not "probably", Guest Additions in the VM are a must have if you're 
> intending to use Guest Properties.

Noted. Thank you both again.

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