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

[André Monteiro]

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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