[Rdo-list] Automatic resizing of root partitions in RDO Icehouse

[Kashyap Chamarthy]

On Wed, May 07, 2014 at 02:31:43PM +0000, St. George, Allan L. wrote:
> I haven’t had the time to work with Icehouse yet, but I have outlined
> instruction that are used to create Havana CentOS images that resize
> automatically upon spawning via linux-rootfs-resize.
> 
> If interested, I’ll forward it along.

That'd be useful. It'd be even better if you could make a quick RDO wiki
page[1] that'll be indexed by the search engines.


[1] http://openstack.redhat.com/

PS: If you're a Markdown user, you can convert Markdown -> WikiMedia
(RDO uses WikiMedia for wiki) trivially like this:

    $ pandoc -f markdown -t Mediawiki foo.md -o foo.wiki

> 
> From: rdo-list-bounces at redhat.com [mailto:rdo-list-bounces at redhat.com]
> On Behalf Of Elías David Sent: Tuesday, May 06, 2014 12:57 PM To:
> Kashyap Chamarthy Cc: rdo-list at redhat.com Subject: Re: [Rdo-list]
> Automatic resizing of root partitions in RDO Icehouse
> 
> 
> Hi thanks for the answers!
> 
> But how is the support right now in OpenStack with centos/fedora
> images regarding the auto resizing during boot? does the disk size set
> in the flavor is respected or not, or does it work only with fedora
> and newer kernels than what CentOS uses...things like that is what I'm
> looking for On May 6, 2014 4:09 AM, "Kashyap Chamarthy"
> <kchamart at redhat.com<mailto:kchamart at redhat.com>> wrote: On Mon, May
> 05, 2014 at 10:22:26PM -0430, Elías David wrote:
> > Hello all,
> >
> > I would like to know what's the current state of auto resizing the
> > root partition in current RDO Icehouse, more specifically, CentOS
> > and Fedora images.
> >
> > I've read many versions of the story so I'm not really sure what
> > works and what doesn't.
> >
> > For instance, I've read that currently, auto resizing of a CentOS
> > 6.5 image for would require the filesystem to be ext3 and I've also
> > read that auto resizing currently works only with kernels >= 3.8, so
> > what's really the deal with this currently?
> >
> > Also, it's as simple as having cloud-init, dracut-modules-growroot
> > and cloud-initramfs-tools installed on the image or are there any
> > other steps required for the auto resizing to work?
> 
> 
> I personally find[1] virt-resize (which works the same way on any
> images) very useful when I'd like to do resizing, as it works
> consistent well.
> 
> I just tried on a Fedora 20 qcow2 cloud image with these below four
> commands and their complete output.
> 
> 1. Examine the root filesystem size _inside_ the cloud image:
> 
>     $ virt-filesystems --long --all -h -a fedora-latest.x86_64.qcow2
> 
>     Name       Type        VFS   Label  MBR  Size  Parent /dev/sda1
>     filesystem  ext4  _/     -    1.9G  - /dev/sda1  partition   -
>     -      83   1.9G  /dev/sda /dev/sda   device      -     -      -
>     2.0G  -
> 
> 2. Create a new qcow2 disk of 10G:
> 
>     $ qemu-img create -f qcow2 -o preallocation=metadata \
>     newdisk.qcow2 10G
> 
> 3. Perform the resize operation:
> 
>     $ virt-resize --expand /dev/sda1 fedora-latest.x86_64.qcow2 \
>     newdisk.qcow2 Examining fedora-latest.x86_64.qcow2 ...  **********
> 
>     Summary of changes:
> 
>     /dev/sda1: This partition will be resized from 1.9G to 10.0G.  The
>     filesystem ext4 on /dev/sda1 will be expanded using the
>     'resize2fs' method.
> 
>     ********** Setting up initial partition table on newdisk.qcow2 ...
>     Copying /dev/sda1 ...  100%
>     ⟦▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒⟧
>     00:00 Expanding /dev/sda1 using the 'resize2fs' method ...
> 
>     Resize operation completed with no errors.  Before deleting the
>     old disk, carefully check that the resized disk boots and works
>     correctly.
> 
> 4. Examine the root file system size in the new disk (should reflect
> correctly):
> 
>     $ virt-filesystems --long --all -h -a newdisk.qcow2 Name
>     Type        VFS   Label  MBR  Size  Parent /dev/sda1  filesystem
>     ext4  _/     -    10G   - /dev/sda1  partition   -     -      83
>     10G   /dev/sda /dev/sda   device      -     -      -    10G   -
> 
> 
> Hope that helps.
> 
> 
>   [1]
>   http://kashyapc.com/2013/04/13/resize-a-fedora-19-guest-with-libguestfs-tools/
> 
> 
> 
> -- /kashyap

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-- 
/kashyap