Libguestfs - Nov 2016 - Re: [ovirt-users] OVA import of FC21 VM hangs during virt-v2v conversion?

Hi,

On Wed, November 16, 2016 5:03 pm, Richard W.M. Jones
wrote:
> On Wed, Nov 16, 2016 at 04:49:46PM -0500, Derek Atkins wrote:
>> I suppose there could be a bug.  I just verified that it's
absolutely
>> setfiles:
>>
>> 14:07:25 E: commandrvf: setfiles -F -e /sysroot/dev -e /sysroot/proc -e
>> /sysroot/selinux -e /sysroot/sys -r /sysroot -q
>> /sysroot/etc/selinux/targeted/contexts/files/file_contexts /sysroot/
>> 14:07:25 E: Can't stat exclude path "/sysroot/selinux",
No such file or
>> directory - ignoring.
>>
>> [ Spacing Emphasis Mine -- there is no break (except time) here ]
>>
>> 16:00:42 E: libguestfs: trace: v2v: selinux_relabel = 0
>
> Yes, this is conclusive.
>
> The guest is Fedora 21?  Does it have an unusually large number of
> files in the filesystem?  Is the host RHEL or Fedora and which
> version?
Guest is Fedora 21.  Host is CentOS 7.2

Guest not have an unusual number of files.  At least looking at the number
of inodes used:
Filesystem      Inodes  IUsed   IFree IUse% Mounted on
/dev/vda3      2894304 164989 2729315    6% /

So... 165,000 files?  My F23 system which imported in 2 minutes has
174,442 inodes used, albeit significantly more free:

Filesystem       Inodes  IUsed    IFree IUse% Mounted on
/dev/vda3      23080448 174442 22906006    1% /

Another difference is ext4 (F21) vs xfs (F23).
> I will see if I can reproduce it.
Thanks.  Worst case I can probably provide you the OVA.

-derek
>
> Rich.
>
> --
> Richard Jones, Virtualization Group, Red Hat
> http://people.redhat.com/~rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
> virt-df lists disk usage of guests without needing to install any
> software inside the virtual machine.  Supports Linux and Windows.
> http://people.redhat.com/~rjones/virt-df/
>

-- 
       Derek Atkins                 617-623-3745
       derek@ihtfp.com             www.ihtfp.com
       Computer and Internet Security Consultant

On Wed, Nov 16, 2016 at 05:09:56PM -0500, Derek Atkins
wrote:
> Guest is Fedora 21.  Host is CentOS 7.2
> 
> Guest not have an unusual number of files.  At least looking at the number
> of inodes used:
> Filesystem      Inodes  IUsed   IFree IUse% Mounted on
> /dev/vda3      2894304 164989 2729315    6% /
> 
> So... 165,000 files?  My F23 system which imported in 2 minutes has
> 174,442 inodes used, albeit significantly more free:
> 
> Filesystem       Inodes  IUsed    IFree IUse% Mounted on
> /dev/vda3      23080448 174442 22906006    1% /
> 
> Another difference is ext4 (F21) vs xfs (F23).
I'll try to reproduce the issue here, but you can also do
the following command directly on the guest disk image if you
want to test something:

  time LIBGUESTFS_BACKEND=direct guestfish --ro -a fc21-64.qcow2 -i
selinux-relabel /etc/selinux/targeted/contexts/files/file_contexts / force:true

As long as you make sure you use the '--ro' flag, this will not make
any changes to the disk image.

For me that command only takes ~15 seconds to run on a Fedora 21 disk
image with minimal (@Core) packages installed.  I'm using a
RHEL 7.3 host.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-df lists disk usage of guests without needing to install any
software inside the virtual machine.  Supports Linux and Windows.
http://people.redhat.com/~rjones/virt-df/

Hi,

On Wed, November 16, 2016 5:15 pm, Richard W.M. Jones
wrote:
> On Wed, Nov 16, 2016 at 05:09:56PM -0500, Derek Atkins wrote:
>
> I'll try to reproduce the issue here, but you can also do
> the following command directly on the guest disk image if you
> want to test something:
>
>   time LIBGUESTFS_BACKEND=direct guestfish --ro -a fc21-64.qcow2 -i
> selinux-relabel /etc/selinux/targeted/contexts/files/file_contexts /
> force:true
>
> As long as you make sure you use the '--ro' flag, this will not
make
> any changes to the disk image.
The OVA has a .vmdk file inside it.  I have no idea where ovirt put the
.qcow2 file.  I suppose I would need to track it down through the VM GUID?

Can I run this command on the disk image of a running VM that's already
been imported?  Or... better, can I run it on a .vmdk file?  Or, worst
case, is there a way to convert the .vmdk to a .qcow2?
> For me that command only takes ~15 seconds to run on a Fedora 21 disk
> image with minimal (@Core) packages installed.  I'm using a
> RHEL 7.3 host.
So noted.  Like I said, I can supply you the ova file if you think it
would help.  It's only 1.7GB  ;)

Thanks,

-derek
>
> Rich.
>
> --
> Richard Jones, Virtualization Group, Red Hat
> http://people.redhat.com/~rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
> virt-df lists disk usage of guests without needing to install any
> software inside the virtual machine.  Supports Linux and Windows.
> http://people.redhat.com/~rjones/virt-df/
>

-- 
       Derek Atkins                 617-623-3745
       derek@ihtfp.com             www.ihtfp.com
       Computer and Internet Security Consultant