cloud-init-dev team mailing list archive

[Scott Moser <smoser@xxxxxxxxxx>]

On Thu, 3 May 2012, Haefliger, Juerg wrote:

> > > Scott,
> > >
> > >
> > >>> Hi all,
> > >>>
> > >>> I've fiddled around with cc_resizefs.py trying to resize a GPT root
> > >>> partition (2nd partition) but I can't get it to work. Any ideas how
> > to
> > >>> do that? Is it possible at all?
> > >>
> > >> Its not configurable at the moment.  Thats not to say that it couldn't
> > be,
> > >> but the code as it is right now just attempt to resize the device that
> > >> '/'
> > >> is on.
> > >>
> > >> It just does:
> > >>    st_dev = os.stat("/").st_dev
> > >>    dev = os.makedev(os.major(st_dev), os.minor(st_dev))
> > >>    os.mknod(devpth, 0400 | stat.S_IFBLK, dev)
> > >>
> > >>    cmd = ['blkid', '-c', '/dev/null', '-sTYPE', '-ovalue', devpth]
> > >>
> > >> So whatever dev major and minor / is on it should attempt to resize.
> > >
> > > I understand what the code is doing. I launched a precise-*-disk1.img
> > cloud image in Nova and noticed that cloud-init correctly resized the
> > root partition to 10GB. What puzzles me is that I don't see a resizing of
> > the root partition before the filesystem is resized. Isn't that a
> > necessity?
> > >
> > ah. sorry. that query does made more sense.
> >
> > cloud-initramfs-utils source package handles that in the initramfs, and
> > it most likely does not support GPT.
>
> Ah ok. Is there a particular reason why this is a separate package? And no, it doesn't support GPT.

I'm not sure why I put it in a separate package. Its somewhat unrleated
but related.

> I played around in Fedora 16 (kernel 3.3.0) but partprobe returns:
> Error: Partition(s) 2 on /dev/vda have been written, but we have been unable to inform the kernel of the change, probably because it/they are in use.  As a result, the old partition(s) will remain in use.  You should reboot now before making further changes.
>
> I haven't found a way around it yet.

Well, if you can come up with something that grows the partition, then we
can add it to cloud-initramfs-growroot , and it can then operate without
the root partition mounted.