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On Aug 20, 2012, at 10:11 PM, Shake Chen <shake.chen at gmail.com> wrote:

> 
> 
> On Tue, Aug 21, 2012 at 9:04 AM, Lorin Hochstein <lorin at nimbisservices.com> wrote:
> 
> On Aug 20, 2012, at 12:47 PM, Samuel Winchenbach <swinchen at gmail.com> wrote:
> 
>> Hi all,
>> 
>> I launched a large (100 GB) VM and made the changes I wanted
>> (installed software, created users, etc...)  and made a snapshot.
>> Now I would like to launch VMs from that snapshot with a smaller disk
>> size, but no mater what flavor I select it always creates a 100GB
>> image.
>> 
>> Is there a way to reduce the ext4 partition size inside the qcow2 disk
>> image?   It might involve creating a new image file and cloning over
>> the original image?  If so what tools do you use for the cloning?
>> 
> 
> Sam:
> 
> You can mount the qcow2 image in your file system using qemu-nbd (see http://en.wikibooks.org/wiki/QEMU/Images#Mounting_an_image_on_the_host) and then resize the partition using the e2fsprogs tools (e.g., see http://en.positon.org/post/Resize-an-ext3-ext4-partition).
> 
> 
> I believe you can also use libguestfs <http://libguestfs.org/> as an alternative to qemu-nbd, but I've never tried it.
> 
> 
> 
> whether is possible done it auto when create snapshot?


Whoops, I didn't read the original post closely enough. I'm not sure how to manipulate a qcow2 image that was created as a snapshot.

Take care,

Lorin
--
Lorin Hochstein
Lead Architect - Cloud Services
Nimbis Services, Inc.
www.nimbisservices.com




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