[one-users] Question about migrating a stand-alone KVM node with VM's into an OpenNebula setup

[Bart]

2012/8/23 André Monteiro <andre.monteir at gmail.com>

> Hello Bart,
>
> Regarding the manual migration, I've done some in the past and you can:
> - shutdown VM
> - create an image template with the source pointing to your raw image (it
> will create a symlink)
> - create a template with your specs and image template
> - instantiate new VM with created template
>
> or if you have already test VM created and running with proper specs:
> - shutdown VM
> - just go to datastore/0/imageid, delete disk.0 (if its a test disk) and
> make a symlink with the path to your image named disk.0
> Now it's just a matter of your existing VMs homogeneity/heterogeneity, if
> they are all alike just go to the 2nd option, or combine the both.
>
> --
> André Monteiro
>
>
>
>
> On Thu, Aug 23, 2012 at 10:33 AM, Bart <bart at pleh.info> wrote:
>
>> Hi,
>>
>> I'm new to OpenNebula and have read some of the documentation and even
>> got the book (b.t.w. a great book!), as such I'm in the process of setting
>> up an initial setup to see how all the pieces fit together.
>>
>> For the initial setup I have 4 servers, all identical, and the setup that
>> I'm going for is a growth model as shown below:
>>
>>    - The first server will be the OpenNebula management server.
>>    - The second and third server will both function as a distributed
>>    filesystem using MooseFS, the idea is to get a redundant server setup for
>>    storage + have the ability to easily grow the storage side.
>>    - The fourth server will become a KVM node in it's own cluser. In
>>    addition to this one node we currently have three other stand-alone KVM
>>    servers which will eventually be integrated into this setup (so in the end
>>    I'll have four KVM nodes, all in one cluster).
>>
>> I'm pretty confident that this setup will work, but if you have some
>> ideas on an even better setup then I'm all up for the info :)
>>
>> As mentioned, we currently have three running stand-alone KVM nodes. They
>> are currently running about 20 VM's in total and I'll have to migrate these
>> VM's towards the OpenNebula setup since OpenNebula doesn't detect the
>> currently running VM's.
>> I've read somewhere on these lists that you'd have to import the current
>> disk image (they are all in raw file format) and try to duplicate the
>> template from where you'll be able to startup a VM with that image. . . (it
>> was a short answer...)
>>
>> My question is, are there example tutorials on how to do these
>> migrations? Or tricks/scripts that can help with the migration?
>>
>> Currently this is the biggest question that I have, if I can do a
>> migration in a proper way (I don't mind if I have to do it manually, as
>> long as it works) then I can start to make plans for a production
>> environment along with a migration plan where I'll move VM's from one
>> server to OpenNebula and then reinstall the stand-alone KVM node to become
>> part of the OpenNebula cluster.
>>
>> Any input would be great, so thanks in advance.
>>
>> --
>> Bart
>>
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>> Users at lists.opennebula.org
>> http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
>>
>>
>
Hi André,

Thanks for the answer, I'll give the first sequence a go and see how far I
can get with it.

-- 
Bart
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