Re: [vserver] Copy-on-write Hard Links, Shared Libraries, Prelink and Memory

From: Gordan Bobic <gordan_at_bobich.net>
Date: Thu 10 Jun 2010 - 10:13:06 BST
Message-ID: <4C10ACA2.8060009@bobich.net>

On 06/10/2010 01:46 AM, Herbert Poetzl wrote:
> On Wed, Jun 09, 2010 at 01:24:42PM +0100, Gordan Bobic wrote:
>> On 06/09/2010 08:48 AM, Corey Wright wrote:
>>> On Tue, 08 Jun 2010 23:39:51 +0100
>>> Gordan Bobic<gordan@bobich.net> wrote:
>
>>>> Finally, is there a utility for re-merging files that got unmerged,
>>>> if they get replaced with the old version that is again the same
>>>> as the template? Can somebody point me at the relevant bit of
>>>> documentation on this?
>
>>> # hashify a vserver
>>> vserver ${VSERVER_NAME} hashify
>
>> Is there a way to include the host into the hashification? If I'm
>> running, say, RHEL5 on RHEL5, it seems wasteful to not merge host's
>> files in as well. Obviously, I could do it manually - I'm more
>> concerned whether it would break something I can't think of at the
>> moment.
>
> it is not a good idea to do that for several reasons, one
> being the fact that host files are used from the host
> context and so the tools working on them could accidentially
> overwrite shared guest files or set permissions which are
> not desired inside the guest ....

What is there to prevent the same thing happening between guests? My
understanding is that the guest contexts are as individually separate
and distinct from each other as they are from the host. Is that not the
case? Is there a security implication here?

Essentially - if it is not safe to do this between the host and a guest,
how come it is safe to do between guests?

Gordan
Received on Thu Jun 10 10:15:43 2010

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