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

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

On Wed, Nov 16, 2016 at 05:30:55PM -0500, Derek Atkins
wrote:
> 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?
Safest and easiest would be to run the command on the .vmdk file.  The
command creates an overlay and works in roughly the same was as
virt-v2v itself does.
> Can I run this command on the disk image of a running VM that's already
> been imported?
As long as you use --ro it's safe to use.  However I'd suggest running
it on the source .vmdk to be as close as possible to what virt-v2v was
doing.

[...]
> So noted.  Like I said, I can supply you the ova file if you think it
> would help.  It's only 1.7GB  ;)
Let's see if this command takes a long time first.  It could be the
cause is elsewhere.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-top is 'top' for virtual machines.  Tiny program with many
powerful monitoring features, net stats, disk stats, logging, etc.
http://people.redhat.com/~rjones/virt-top

Hi,

On Wed, November 16, 2016 5:39 pm, Richard W.M. Jones
wrote:
> On Wed, Nov 16, 2016 at 05:30:55PM -0500, Derek Atkins wrote:
>> 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?
>
> Safest and easiest would be to run the command on the .vmdk file.  The
> command creates an overlay and works in roughly the same was as
> virt-v2v itself does.
>
>> Can I run this command on the disk image of a running VM that's
already
>> been imported?
>
> As long as you use --ro it's safe to use.  However I'd suggest
running
> it on the source .vmdk to be as close as possible to what virt-v2v was
> doing.
>
> [...]
>> So noted.  Like I said, I can supply you the ova file if you think it
>> would help.  It's only 1.7GB  ;)
>
> Let's see if this command takes a long time first.  It could be the
> cause is elsewhere.
I found the disk image for the running VM, created a symlink, and then ran
the command above.  It took a while:

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

real	114m17.757s
user	114m16.476s
sys	0m6.042s


I could do it off the vmdk if you wish, but I'm sure there haven't been
many significant changes to the VM since it was imported.  Besides, I
suspect it wouldn't change the outcome of the test.
> Rich.
-derek

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