Openstack stemcell image format QCOW2 or RAW?

[m...@matt-j.co.uk]

Hi all,

Having an issue running stemcells on an Openstack instance and reasearch seems to suggest it's due to incompatibility between the QCOW2 image format and our openstack clusters CEPH-Backed storage.

Long story short, I wanted to convert the stemcell image to RAW;

Extracted bosh-stemcell-1478-openstack-kvm-ubuntu.tgz

root@ft-cloudhammer:~/deployments/extracted-bosh-stemcell-1478-openstack-kvm-ubuntu# ls -la

total 390272

drwxr-xr-x 2 root root      4096 Dec  4 16:07 .

drwxr-xr-x 4 root root      4096 Dec  4 18:43 ..

-rw-r--r-- 1 root root      5846 Dec  3 22:16 apply_spec.yml

-rw-r--r-- 1 root root 399577476 Dec  3 22:21 image

-rw-r--r-- 1 root root     31634 Dec  3 21:49 stemcell_dpkg_l.txt

-rw-r--r-- 1 root root       347 Dec  3 22:22 stemcell.MF

Confirmed stemcell.MF;

root@ft-cloudhammer:~/deployments/extracted-bosh-stemcell-1478-openstack-kvm-ubuntu# cat stemcell.MF

---

name: bosh-openstack-kvm-ubuntu

version: '1478'

bosh_protocol: 1

sha1: b528c59d5e47c7e898aca8bbd8f9e5a657a8edac

cloud_properties:

  name: bosh-openstack-kvm-ubuntu

  version: '1478'

  infrastructure: openstack

  disk_format: qcow2

  container_format: bare

  os_type: linux

  os_distro: ubuntu

  architecture: x86_64

  auto_disk_config: 'true'

Simple, I thought, change disk_format to raw in stemcell.MF and then run the following command on the image file;

mv image image.qcow2
qemu-img convert image.qcow2 image.raw
mv image.raw image
sha1sum image

However.... qemu-image info gives me conflicting information;

root@ft-cloudhammer:~/deployments/extracted-bosh-stemcell-1478-openstack-kvm-ubuntu# qemu-img info image

image: image

file format: raw

virtual size: 381M (399577088 bytes)

disk size: 381M

Apparently the image is *already* in RAW format?

Is this the case? Could someone confirm how the stemcell images are created?

I tried the convert nontheless and the sha1 did change, however the re-packaged stemcell now fails to upload (yes i repliaced the sha1: field in stemcell.MF).

Kind Regards,

Matt

[Ferran Rodenas]

Matt, don't forget untar the 'image' file, the real image is located at a file called 'root.img':

root@inception:~/bosh-workspace/stemcells# tar xzvf bosh-stemcell-latest-openstack-kvm-ubuntu.tgz 

apply_spec.yml

image

stemcell_dpkg_l.txt

stemcell.MF

root@inception:~/bosh-workspace/stemcells# tar xzvf image 

root.img

root@inception:~/bosh-workspace/stemcells# qemu-img info root.img 

image: root.img

file format: qcow2

virtual size: 10G (10737418240 bytes)

disk size: 1.0G

cluster_size: 65536

It should be in QCOW2 format.

- Ferdy

2013/12/5 <m...@matt-j.co.uk>

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[m...@matt-j.co.uk]

Doh!

This is the information I was missing!

Many thanks,

Matt