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From David Nalley <da...@gnsa.us>
Subject Re: Using libguestfs for modifying (System) VM's
Date Sat, 21 Apr 2012 19:52:30 GMT
On Sat, Apr 21, 2012 at 7:50 AM, Wido den Hollander <wido@widodh.nl> wrote:
> Hi,
>
> I'm not a big fan of all the bash scripts which are being called on KVM
> system for deploying the System VM's.
>
> They try to mount the guest, inject data (like SSH keys) and then continue
> the boot process of the guest.
>
> It's something I don't like and I think libguestfs [0] can help here.
>
> With guestfish [1] you can access the VM and modify its filesystem:
>
> guestfish <<_EOF_
>  add disk.img
>  run
>  mount /dev/vda1 /
>  write-append /root/.ssh/authorized_keys "ssh-rsa XXXXXX...."
>  _EOF_
>
> Imho this would be a much cleaner way to modify the System VM's without
> having to set up loop devices, mount them, etc, etc.
>
> The nice thing with libguestfs is that you can access the VM's while they
> are running (use with caution!), so that gives you much more flexibility!
>
> There is a native C API, but there also seem to be Java bindings [2], so
> that could make it much cleaner to integrate into CloudStack.
>
> libguestfs also seems to be present in Fedora [3] and in RHEL 6, so that
> shouldn't be a problem.
>
> Searching the web showed me some reports of libguestfs and CloudStack, but
> browsing the code I found no reference to this.
>
> Something worth looking at I think?
>
> Wido
>
> [0]: http://libguestfs.org/
> [1]: http://libguestfs.org/guestfish.1.html
> [2]: http://libguestfs.org/guestfs-java.3.html
> [3]: https://fedoraproject.org/wiki/Features/libguestfs

Yes please - guestfish would likely make this far more efficient all
the way around.

--David (whose opinion doesn't matter much because I don't maintain
the systemvms :) )

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