Re: [Vserver] One More Time - copy a Guest from system to system

From: Roderick A. Anderson <raanders_at_acm.org>
Date: Tue 10 Jul 2007 - 21:51:33 BST
Message-ID: <4693F155.9080208@acm.org>

Daniel Hokka Zakrisson wrote:
> Roderick A. Anderson wrote:
>> I've been all through the Wiki and old docs, searched using Google,
>> looked through my _OLD_ messages (back to 2003) and still can't come up
>> with a well defined method to copy a (running if possible) vserver guest
>> from one system to another.
>>
>> From my reading I think I need to build the _new_ guest 'mynewone'
>> using the skeleton method. Then rm all the files in /vserver/mynewone
>> and follow that with a rsync from the _old_ guest to the _new_ guest.
>> Unfortunately the vserver docs are from the CTX kernels. A vserver
>> --help gets a semi-useful help screen. Any newer docs?
>>
>> What special rsync switches do I need or use to make this process
>> doable? As in it is a running guest that I'd prefer not taking down
>> until the actual move I'm sure /proc and maybe /dev could cause problems.
>>
>> The need for the hot copy is because the _old_ guest has a big pile of
>> installed perl modules and _other_ software packages. It would be
>> easier to copy than (re)install them. :-)
>
> The way I'd do it:
> export RSYNC_RSH=ssh
> vserver <guest> build -m rsync --context ... -- --source
> root@otherhost:/vservers/<guest>/

I've got this far but since it is getting a new IP I used that instead
of the current IP. Not a high traffic site so after I change to the old
IP I'll try this next step.

> <make sure it's good, stop the guest on the other host>

How not good? I'm thinking rsync does it right so maybe my invocation
could have been wrong. ???

> rsync -Hazx --numeric-ids root@otherhost:/vservers/<guest>/

The man page for rsync seems to indicate that the -H switch will be in
conflict with the -a switch or the other way around.

Rod

-- 
> /vservers/<guest>/
> vserver <guest> start
> 
> --
> Daniel Hokka Zakrisson
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