[Libguestfs] virt-v2v: Died at /usr/bin/virt-p2v-server line 411

[Nicolas Ecarnot]

Le 19/11/2014 18:12, Richard W.M. Jones a écrit :
> On Wed, Nov 19, 2014 at 04:42:23PM +0100, Nicolas Ecarnot wrote:
>> disks:
>> 	nbd:localhost:33363 (raw) [sda]
>> 	nbd:localhost:49584 (raw) [sdb]
>> 	nbd:localhost:41988 (raw) [sdc]
>> removable media:
>>
>> NICs:
>>
>> [   0.0] Creating an overlay to protect the source from being modified
>> qemu-img create -q -f qcow2 -b 'nbd:localhost:33363' -o
>> 'compat=1.1,backing_fmt=raw' /var/tmp/v2vovl636444.qcow2
>> nbd.c:nbd_receive_negotiate():L501: read failed
>> qemu-img: /var/tmp/v2vovl636444.qcow2: Could not open
>> 'nbd:localhost:33363': Could not open image: Invalid argument:
>> Invalid argument
>
> What is supposed to happen is that qemu-nbd is started (3 times) on
> the virt-p2v machine.  Then 3 x ssh connections are made which reverse
> proxy the nbd connection from virt-v2v back to virt-p2v, the
> equivalent of:
>
>    ssh -R 33363:localhost:<hostport> virt-v2v-server
>
> Somehow that's not happening.
>
> I'm not sure what.  Is this reproducible?  Do you have an unusual
> firewall configuration on the virt-v2v conversion server?
>
> Rich.
>

It is 100% reproductible.

Your interesting comment lead me to keep a better look at 
/var/log/secure on the conversion server :

The "test" button succeed in connecting. I see it in the logs.

Nov 19 21:48:23 serv-p2v-adm1 sshd[2654]: Accepted password for root 
from 192.168.49.5 port 36574 ssh2
Nov 19 21:48:23 serv-p2v-adm1 sshd[2654]: pam_unix(sshd:session): 
session opened for user root by (uid=0)
Nov 19 21:48:23 serv-p2v-adm1 sshd[2654]: Received disconnect from 
192.168.49.5: 11: disconnected by user
Nov 19 21:48:23 serv-p2v-adm1 sshd[2654]: pam_unix(sshd:session): 
session closed for user root

Here I wait on purpose a long time to distinguish what is happening in 
the log files.
I'm filling in the different fields in the conversion screen, the I 
launch the conversion, and I see that :

(192.168.49.5 is the source machine)

Nov 19 21:54:52 serv-p2v-adm1 sshd[2725]: Accepted password for root 
from 192.168.49.5 port 36575 ssh2
Nov 19 21:54:52 serv-p2v-adm1 sshd[2725]: pam_unix(sshd:session): 
session opened for user root by (uid=0)
Nov 19 21:54:52 serv-p2v-adm1 sshd[2727]: Accepted password for root 
from 192.168.49.5 port 36576 ssh2
Nov 19 21:54:52 serv-p2v-adm1 sshd[2727]: pam_unix(sshd:session): 
session opened for user root by (uid=0)
Nov 19 21:54:53 serv-p2v-adm1 sshd[2725]: channel 2: open failed: 
connect failed: Connection refused
Nov 19 21:54:53 serv-p2v-adm1 sshd[2727]: Received disconnect from 
192.168.49.5: 11: disconnected by user
Nov 19 21:54:53 serv-p2v-adm1 sshd[2725]: Received disconnect from 
192.168.49.5: 11: disconnected by user
Nov 19 21:54:53 serv-p2v-adm1 sshd[2725]: pam_unix(sshd:session): 
session closed for user root
Nov 19 21:54:53 serv-p2v-adm1 sshd[2727]: pam_unix(sshd:session): 
session closed for user root

Indeed, I see "Connection refused".
Let's investigate on this.

On the conversion server (serv-p2v-adm1), before running all this, I did 
a "iptables -F" (and a restart of NFS - not knowing if it was needed), 
so I have no rule in iptables now.

Do I have to find a way to increase the verbosity of sshd in 
/var/log/secure?

Another point : as I wrote it before, I have no way to get a shell 
prompt on the source machine, because alt-F1 leads to a blinking screen 
trying to run virt-p2v and failing and respawning.
I nmap'd this source host, and saw that ssh was open.
In order to run the action step by step, is there a way to connect to 
this root account? What password? (already tried 
secret/p2v/root/password/PASSWORD/redhatrulez but that did not the trick)

Regards,

-- 
Nicolas Ecarnot