[one-users] path error when PXE-booting VMs

[Tino Vazquez]

Hi Michael,

The problem is that a diskless VM will cause that the transfer driver
doesn't get called. This transfer driver is responsible for creating the
'images' directory. If you want t a network-booted machine you can try out
the following: in src/vmm_mad/kvm/one_vmm_kvm.rb change line 88 from:

        cmd = "cat > #{remote_dfile} && #{LIBVIRT[:create]} #{remote_dfile}"

to

        deployment_filename = File.baseame remote_dfile
        images_path               =
remote_dfile.gsub(deployment_filename,'')
        cmd = "mkdir -p #{images_path} && cat > #{remote_dfile} &&
#{LIBVIRT[:create]} #{remote_dfile}"


Please try this out, and if you find it useful please come back to us with
some feedback to we can include it in future releases.

About your second questions, there are two deployment.0 images due to
OpenNebula design and its ability to use ssh or nfs. Because the VMM driver
doesn't know wihch storage it is being used, OpenNebula always uses a
scratch 'images' directory in the remote node were the deployment.0 file and
disks are copied from the front-end to there. If the storage is NFS based
you end up with two deployment.0 files locally. The 'images' directory is
used because doing a cat of a file over the same file will result on a null
file. Hope this makes sense :o

Regards,

-Tino

--
Constantino Vázquez, Grid Technology Engineer/Researcher:
http://www.dsa-research.org/tinova
DSA Research Group: http://dsa-research.org
Globus GridWay Metascheduler: http://www.GridWay.org
OpenNebula Virtual Infrastructure Engine: http://www.OpenNebula.org


On Wed, Nov 11, 2009 at 9:21 PM, Michael W. Lucas <
mwlucas at blackhelicopters.org> wrote:

> Hi,
>
> My ON 1.4beta2/KVM environment is working fine with disk images.  ON
> cannot start a network-booted machine, however.  The problem appears
> to be with the path used for the deployment file.  If I use this template:
>
> NAME   = onvm1
> CPU    = 0.5
> MEMORY = 512
> OS      = [ BOOT   = network ]
> NIC     = [ BRIDGE = "br0",
>           MAC = "00:16:8B:AB:C7:14" ]
> GRAPHICS = [type="vnc",listen="127.0.0.1",port="-1"]
>
> the error log shows:
>
> Wed Nov 11 15:14:34 2009 [VMM][D]: Message received: LOG - 2 Command
> execution fail: 'cat > /one_dir/2/images/deployment.0 && virsh --connect
> qemu:///system create /one_dir/2/images/deployment.0'
>
> /one_dir/2/images/deployment.0 doesn't exist.  But
> /one_dir/2/deployment.0 does exist, along with vm.log and the transfer
> files.  There's no "images" subdirectory.
>
> On a simple VM with a hard drive, such as this, we do have an images
> subdirectory.  Oddly, I have separate but identical deployment.0 files
> in multiple locations.
>
> clusterhead1/one_dir/1;ls -lai
> total 10K
> 156066 drwxrwxrwx 3 oneadmin oneadmin    6 2009-11-11 15:06 .
> 155649 drwxr-xr-x 6 oneadmin oneadmin   13 2009-11-11 15:17 ..
> 156092 -rw-r--r-- 1 oneadmin oneadmin  368 2009-11-11 15:06 deployment.0
> 156088 drwxrwxrwx 2 oneadmin oneadmin    4 2009-11-11 15:06 images
> 156087 -rw-r--r-- 1 oneadmin oneadmin   83 2009-11-11 15:06
> transfer.0.prolog
> 156067 -rw-r--r-- 1 oneadmin oneadmin 2173 2009-11-11 15:17 vm.log
>
> clusterhead1/one_dir/1;ls -lai images/
> total 5K
> 156088 drwxrwxrwx 2 oneadmin oneadmin   4 2009-11-11 15:06 .
> 156066 drwxrwxrwx 3 oneadmin oneadmin   6 2009-11-11 15:06 ..
> 156093 -rw-r--r-- 1 oneadmin oneadmin 368 2009-11-11 15:06 deployment.0
> 156089 lrwxrwxrwx 1 oneadmin oneadmin  28 2009-11-11 15:06 disk.0 ->
> /one_dir/one_images/dns1.raw
> clusterhead1/one_dir/1;
>
> Any suggestions, folks?
>
> Thanks,
> ==ml
>
> --
> Michael W. Lucas        mwlucas at BlackHelicopters.org
> http://www.MichaelWLucas.com/
> Latest book:  Cisco Routers for the Desperate, 2nd Edition
> http://www.CiscoRoutersForTheDesperate.com/
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