Subject: Re: [vserver] vmstat and vserver
From: "John A. Sullivan III" <jsullivan@opensourcedevel.com>
Date: Sat, 06 Jun 2009 18:34:04 -0400

Thanks.  Very helpful as always - John

On Sun, 2009-06-07 at 00:15 +0200, Herbert Poetzl wrote:
> On Thu, Jun 04, 2009 at 02:57:26PM -0400, John A. Sullivan III wrote:
> > Hello, all. We are trying to run zimbra in a vserver. We have almost
> > everything working but there are a few nasty problems remaining. 
> > One of them is the statistics collector which wants to run vmstat.
> 
> which doesn't really make sense inside a guest, as the
> vmstat would show the host wide information
> 
> > This fills the error logs with messages about needing to mount /proc;
> > I assume this is because /proc/vmstat is not exposed to the vserver.
> 
> well, it is because a program (probably vmstat) implements
> a broken heuristic to determine whether proc is mounted
> or not ...
> 
> > I would imagine the solution is to add /proc/vmstat to vprocunhide. 
> > Are there any caveats to doing that?
> 
> not from the system PoV, but it shows host information
> on a guest, which is usually not what you want
> 
> > I was hoping to do this just for the one vserver but it looks like 
> > it's an all or nothing approach.  
> 
> yep, patches are welcome :)
> 
> but you could work around that by using --bind mounts to
> replace the unwanted entry in other guests ...
> 
> > What is the difference between making the entry in 
> > /etc/vservers/.defaults/apps/vprocunhide and 
> > /usr/lib64/util-vserver/defaults/vprocunhide-files?
> 
> the former will be kept over updates, where the latter
> will be replaced by a new util-vserver version
> 
> btw, IMHO the best solution to this 'problem' would be to
> make this thing configureable in zimbra, the second best to
> write a dummy vmstat script/binary to avoid the vmstat
> 
> best,
> Herbert
> 
> > Thanks - John
> > -- 
> > John A. Sullivan III
> > Open Source Development Corporation
> > +1 207-985-7880
> > jsullivan@opensourcedevel.com
> > 
> > http://www.spiritualoutreach.com
> > Making Christianity intelligible to secular society
-- 
John A. Sullivan III
Open Source Development Corporation
+1 207-985-7880
jsullivan@opensourcedevel.com

http://www.spiritualoutreach.com
Making Christianity intelligible to secular society