[Libguestfs] virt-resize

[Dan The Man]

On Mon, 25 Jun 2012, Nikita A Menkovich wrote:

> You can write to UFS. It is rather safe. But you could not make a
> resize of ufs filesystem on Linux. There is not utilities for this.
>
> On 25 June 2012 18:53, Richard W.M. Jones <rjones at redhat.com> wrote:
>> On Mon, Jun 25, 2012 at 09:04:26AM -0500, Dan The Man wrote:
>>>
>>>
>>> On Mon, 25 Jun 2012, Nikita A Menkovich wrote:
>>>
>>>> For now, UFS in Linux do not support resizing at all. There is only
>>>> one way to resize: create new image, partition, attach to existing
>>>> freebsd, install bootloader, sync files.
>>>
>>>
>>> Don't think guestmount even supports ufs even if it is enabled either:
>>> Did a quick download of this read only ufs module: rpm -i
>>> kmod-ufs-0.0-1.el6.elrepo.x86_64.rpm
>>>
>>> cappy:~# modprobe ufs
>>
>> After downloading a kmod, you need to rebuild the libguestfs
>> appliance.  Just do:
>>
>>  rm -rf /var/tmp/.guestfs-*

Tried this but still got ufs unknown type ufs error.


>>
>>> cappy:~# guestmount -a /dev/virtual/freebsd -m /dev/sda2 /freebsd -r
>>> libguestfs: error: mount_options: /dev/vda2 on /: mount: unknown
>>> filesystem type 'ufs'
>>> guestmount: '/dev/sda2' could not be mounted.  Did you mean one of these?
>>>         /dev/vda1 (unknown)
>>>         /dev/vda2 (ufs)
>>>         /dev/vda3 (unknown)
>>
>> You can pass the extra mount options to guestmount, so this might
>> work:
>>
>>  guestmount [...] -m /dev/sda2:/:ro,ufstype=ufs2 [...]
>>

cappy:~# guestmount -a /dev/virtual/centos -m /dev/sda1:/ /centos
cappy:~# umount /centos
cappy:~# guestmount -a /dev/virtual/centos -m /dev/sda1:/:ro /centos
libguestfs: error: mount_options: you must mount something on / first
guestmount: '/dev/sda1' could not be mounted.  Did you mean one of these?
         /dev/vda1 (ext4)
         /dev/virtual/root (ext4)
         /dev/virtual/swap (swap)
cappy:~#

Just trying to pass a simple "ro" option, can't seem to get it to take any 
option even on a simple /boot mount on sda1?


Dan.




>> Or if you want full control over everything (only available in
>> libguestfs >= 1.18), replace guestmount with a command like:
>>
>>  guestfish <<EOF
>>    add /dev/virtual/freebsd
>>    run
>>    #modprobe ufs (?)
>>    mount-vfs "ro,ufstype=ufs2" "ufs" "/dev/sda2" "/"
>>    mount-local /tmp/mntpoint
>>    mount-local-run
>>  EOF
>>
>> There are lots of configurables for each of those commands.  Read the
>> guestfish(1) man page for more information.
>>
>> There are several variations of ufs, and the Linux ufs driver isn't
>> really that great.  I wouldn't trust it to do writes, at least not
>> without doing a great deal of testing first.
>>
>> Rich.
>>
>> --
>> Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
>> New in Fedora 11: Fedora Windows cross-compiler. Compile Windows
>> programs, test, and build Windows installers. Over 70 libraries supprt'd
>> http://fedoraproject.org/wiki/MinGW http://www.annexia.org/fedora_mingw
>
>
>
> -- 
> Nikita A Menkovich
> http://libc6.org/
> JID: menkovich at gmail.com
>