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

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

On Wed, Nov 16, 2016 at 08:07:15PM -0500, Derek Atkins
wrote:
> 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
That certainly demonstrates the bug.  I'm unclear why it would be
happening, but perhaps you can run the following commands and send me
the results:

LIBGUESTFS_BACKEND=direct guestfish --ro -a fc21-64.qcow2 -i find / > files

LIBGUESTFS_BACKEND=direct virt-cat -a fc21-64.qcow2
/etc/selinux/targeted/contexts/files/file_contexts / > file_contexts

rpm -qf /usr/sbin/setfiles > setfiles.version

Note that the first command produces a list of all filenames within
the virtual machine, which might be sensitive information, so you may
wish to send me that file privately.

Thanks,

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
Fedora Windows cross-compiler. Compile Windows programs, test, and
build Windows installers. Over 100 libraries supported.
http://fedoraproject.org/wiki/MinGW

[This email is either empty or too large to be displayed at this time]