nova-compute fails to mount disk image when there is no partition table

For file injection, if you have a whole disk image it tries to inject into partition 1. If you have a separate kernel and ramdisk, it will try to inject without a partition. This means that you have to put your data in the first partition for a whole disk image. If you don't care about injected files, you can safely ignore the warning.

On Feb 8, 2012, at 9:31 AM, Alvaro Lopez wrote:

> Public bug reported:
>
> Hello there.
>
> I have a disk image with no partitions inside. Instances can be launched
> from it perfectly, except that nova cannot mount it (I'm using loop and
> nbd as img_handlers) so as to inject files. From the logs it fails
> complaining that there are no available partitions. This is due to the
> fact that it "kpartx -a" doest not find any mapping from the disk image,
> although it will be possible to use the device directly (i.e. without
> any mappings).
>
> I do not really know if this is a bug or this is the expected behavior
> (namely, that images *must* contain partitions).
>
> ** Affects: nova
> Importance: Undecided
> Status: New
>
> --
> You received this bug notification because you are subscribed to
> OpenStack Compute (nova).
> https://bugs.launchpad.net/bugs/929005
>
> Title:
> nova-compute fails to mount disk image when there is no partition
> table
>
> Status in OpenStack Compute (Nova):
> New
>
> Bug description:
> Hello there.
>
> I have a disk image with no partitions inside. Instances can be
> launched from it perfectly, except that nova cannot mount it (I'm
> using loop and nbd as img_handlers) so as to inject files. From the
> logs it fails complaining that there are no available partitions. This
> is due to the fact that it "kpartx -a" doest not find any mapping from
> the disk image, although it will be possible to use the device
> directly (i.e. without any mappings).
>
> I do not really know if this is a bug or this is the expected behavior
> (namely, that images *must* contain partitions).
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/nova/+bug/929005/+subscriptions

Thank for your reply, Vish.

Now the behavior is clear:
    - Whole disk, injection with partition.
    - Separate kernel and ramdisk, injetion without partition.

Thanks!