How much of a mess does OpenVZ make? ;) Was: What can OpenVZ do?

Ingo Molnar mingo at
Sat Mar 14 01:12:07 PDT 2009

* Eric W. Biederman <ebiederm at> wrote:

> >> In the OpenVZ case, they've at least demonstrated that the 
> >> filesystem can be moved largely with rsync.  Unlinked files 
> >> need some in-kernel TLC (or /proc mangling) but it isn't 
> >> *that* bad.
> >
> > And in the Zap we have successfully used a log-based 
> > filesystem (specifically NILFS) to continuously snapshot the 
> > file-system atomically with taking a checkpoint, so it can 
> > easily branch off past checkpoints, including the file 
> > system.
> >
> > And unlinked files can be (inefficiently) handled by saving 
> > their full contents with the checkpoint image - it's not a 
> > big toll on many apps (if you exclude Wine and UML...). At 
> > least that's a start.
> Oren we might want to do a proof of concept implementation 
> like I did with network namespaces.  That is done in the 
> community and goes far enough to show we don't have horribly 
> nasty code.  The patches and individual changes don't need to 
> be quite perfect but close enough that they can be considered 
> for merging.
> For the network namespace that seems to have made a big 
> difference.
> I'm afraid in our clean start we may have focused a little too 
> much on merging something simple and not gone far enough on 
> showing that things will work.
> After I had that in the network namespace and we had a clear 
> vision of the direction.  We started merging the individual 
> patches and things went well.

I'm curious: what is the actual end result other than good 
looking code? In terms of tangible benefits to the everyday 
Linux distro user. [This is not meant to be sarcastic, i'm
truly curious.]


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