[one-users] VM template disk type cdrom

[Shashank Rachamalla]

Hi

I have faced the same issue while working with OpenNebula 1.4.

As you have already mentioned, I had to change LibVirtDriver.cc and
recompile from source.

I had to add an else if block ( in bold font ) to the below piece of code in
LibVirtDriver.cc

        if ( type == "BLOCK" )
        {
            file << "\t\t<disk type='block' device='disk'>" << endl
                 << "\t\t\t<source dev='" << vm->get_remote_dir() <<
"/disk."
                 << i << "'/>" << endl;
        }

          /* Added newly */
*        else if ( type == "CDROM")
        {
            file << "\t\t<disk type='file' device='cdrom'>" << endl
                 << "\t\t\t<source file='" << vm->get_remote_dir() <<
"/disk."
                 << i << "'/>" << endl;
        }
*
        else
        {
            file << "\t\t<disk type='file' device='disk'>" << endl
                 << "\t\t\t<source file='" << vm->get_remote_dir() <<
"/disk."
                 << i << "'/>" << endl;
        }

I have also seen issues while working with qemu hypervisor version 0.11.0
(qemu-kvm-0.11.0). After making the above changes, I have created a new VM
and the following deployment descriptor was created:

<domain type='kvm'>
    <name>one-16</name>
    <memory>524288</memory>
    <os>
        <type>hvm</type>
        <boot dev='cdrom'/>
    </os>
    <devices>
        <emulator>/usr/bin/kvm</emulator>
        <disk type='file' device='cdrom'>
            <source dev='/var/lib/one/16/images/disk.0'/>
            <target dev='hdb'/>
        </disk>
        <graphics type='vnc' listen='0.0.0.0' port='15'/>
    </devices>
    <features>
        <acpi/>
    </features>
</domain>

disk.0 is linked to an iso file.
lrwxrwxrwx 1 oneadmin nogroup 23 2010-05-27 22:37 disk.0 ->
/mnt/onenfs/ReactOS.iso


The following are the contents of  var/log/libvirt/qemu/one-16.log

LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
/usr/bin/kvm -S -M pc-0.11 -m 512 -smp 1 -name one-16 -uuid
70ac26ff-654e-9149-8323-283a7e66f1b6 -monitor
unix:/var/run/libvirt/qemu/one-16.monitor,server,nowait *-boot d -drive
file=,if=ide,media=cdrom,index=1* -net none -serial none -parallel none -usb
-vnc 0.0.0.0:-5885 -vga cirrus

Note the line in bold above. Ideally file should be pointing to
'/var/lib/one/16/images/disk.0' but it was not pointing to anything. As a
result VM couldn't boot.

Can somebody please throw some light on this issue.

On 18 May 2010 07:56, florian chazal <florianchazal at gmail.com> wrote:

> Hi,
>
> Is it normal that when you create a virtual machine and you configure one
> of its disk as a cdrom :
>
> #########Open nebula VM Template #########
> ...
> OS = [ BOOT = \"cdrom\" ]
> ...
> DISK = [ TYPE = "cdrom" ,
> SOURCE = "/srv/cloud/one/IM_template/debian-504-i386-netinst.iso" ,
> TARGET = "hdc" ,
> CLONE = "no" ,
> SAVE = "no" ,
> READONLY = "no" ]
> DISK = [ TYPE = "disk" ,
> SOURCE = "/srv/cloud/one/IM_template/test.qcow2" ,
> TARGET = "hda" ,
> CLONE = "no" ,
> SAVE = "no" ,
> READONLY = "no" ]
> ...
> ################################
>
> the libvirt driver translate it like this :
>
> #########LibVirt VM Template #########
> ...
> <os>
>                 <type>hvm</type>
>                 <boot dev='"cdrom"'/>
>         </os>
>         <devices>
>                 <emulator>/usr/bin/kvm</emulator>
>                 <disk type='file' device='disk'>
>                         <source
> file='/srv/cloud/one/var/94/images/disk.0'/>
>                         <target dev='hdc'/>
>                 </disk>
>                 <disk type='file' device='disk'>
>                         <source
> file='/srv/cloud/one/var/94/images/disk.1'/>
>                         <target dev='hda'/>
>                 </disk>
> ...
> ################################
>
> That is to say the translation doesn't care about my cdrom type . And the
> vm failed. but if I put cdrom in the device attirbute it works ...
>
> I searched in the code and I realized that if the type is block in the ON
> template the device attirbute will be set as disk and if not it will be set
> at disk again : root<http://dev.opennebula.org/projects/opennebula/repository/revisions/master/show>/
> src<http://dev.opennebula.org/projects/opennebula/repository/revisions/master/show/src>/
> vmm<http://dev.opennebula.org/projects/opennebula/repository/revisions/master/show/src/vmm>/
> LibVirtDriver.cc<http://dev.opennebula.org/projects/opennebula/repository/revisions/master/changes/src/vmm/LibVirtDriver.cc>line 687 to 697 ...
>
>
> --
> Florian Chazal
>
> _______________________________________________
> Users mailing list
> Users at lists.opennebula.org
> http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
>
>


-- 
Regards,
Shashank Rachamalla
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