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From Geoff Higginbottom <geoff.higginbot...@shapeblue.com>
Subject RE: DevCloud : how to customize VHD template
Date Fri, 04 Jan 2013 17:25:26 GMT
+1

Regards

Geoff Higginbottom

D: +44 20 3603 0542 | S: +44 20 3603 0540 | M: +447968161581

geoff.higginbottom@shapeblue.com


-----Original Message-----
From: Rohit Yadav [mailto:rohit.yadav@citrix.com]
Sent: 04 January 2013 17:21
To: cloudstack-users@incubator.apache.org
Subject: RE: DevCloud : how to customize VHD template

Hi Youri,

Thanks for sharing your anecdotes.
You should post a blog so your solution becomes google-able.

Kudos,
Rohit
________________________________________
From: Youri Bonnaffé [youri.bonnaffe@activeeon.com]
Sent: Friday, January 04, 2013 10:32 PM
To: cloudstack-users@incubator.apache.org
Subject: DevCloud : how to customize VHD template

Hello,

As I've had issues to create and customize an instance template using DevCloud, I would like
to share how I finally did it. My goals were to reuse the TTY Linux template, add some custom
programs in the template and create a boot script; basically to be able to quickly start an
autoconfigured instance.

Resizing the VHD template is achievable using vhd-util :
* Download the TTY template using the Cloudstack web client
* On the Xen host, aka the DevCloud virtualbox VM, you can use vhd-util
   vhd-util resize -n mytemplate.vhd -j output.log -s 200 (to extend its size to 200M)
* On the Xen host create a block device mapped to the VHD file using tap-ctl
  here is a sample script to will do it ($1 MUST be an absolute path)

*device=$(tap-ctl allocate)
deviceid=${device#/dev/xen/blktap-2/tapdev}
echo $deviceid
spawn=$(tap-ctl spawn)
pid=${spawn#tapdisk spawned with pid }
echo $pid
tap-ctl attach -p $pid -m $deviceid
tap-ctl open -p $pid -m $deviceid -a vhd:$1

* * Use resize2fs */dev/xen/blktap-2/tapdev...IDOFDEVICE *to expand the partition size (fsck
might be needed, do it)
 * Now if you mount the device *mount /dev/xen/blktap-2/tapdevID some_folder
* you should see a partition of 200M instead of the 50M default TTY Linux template

While you are at it you can edit files since the image is mounted.

 * Unmount it when you are done
 * Remove the block device
*      pid=$1
      deviceid=$2
      tap-ctl close -m $deviceid -p $pid
      tap-ctl detach -m $deviceid -p $pid
      tap-ctl free -m $deviceid*

Then can you can import back the VHD template file using the Cloudstack web client.

I hope it will be helpful to someone, I've been struggling for days to do it (I'm not familiar
with Xen technologies thought).

  Youri,

ShapeBlue provides a range of strategic and technical consulting and implementation services
to help IT Service Providers and Enterprises to build a true IaaS compute cloud. ShapeBlue’s
expertise, combined with CloudStack technology, allows IT Service Providers and Enterprises
to deliver true, utility based, IaaS to the customer or end-user.

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