[libvirt-users] tunneled VM migration error

[Shantanu Pavgi]

On Mar 7, 2012, at 3:49 PM, Jiri Denemark wrote:

> On Wed, Mar 07, 2012 at 21:23:30 +0000, Shantanu Pavgi wrote:
>> 
>> I am getting following error with tunneled migration command: 
>> {{{
>> $ virsh --connect qemu:///system migrate --verbose --p2p --tunnelled 32 qemu+ssh://kvm-03/system
>> error: operation failed: Failed to connect to remote libvirt URI qemu+ssh://kvm-03/system
>> 
>> }}}
>> 
>> However I am able to perform other virsh command like list, pool-list, dumpxml using the same remote libvirt URI: 
>> {{{
>> $ virsh --connect qemu+ssh://kvm-03/system list
>> }}}
>> 
>> Also, the hypervisor native migration is working fine with following command:
>> {{{
>> $ virsh --connect qemu:///system migrate 31 qemu+ssh://kvm-03/system
>> }}}
>> 
>> I am confused why remote URI worked for some of the commands but not for the
>> migrate command. Am I missing something with the tunneled migration command
>> or libvirtd/qemu configuration file? Any help would be appreciated.  
> 
> The thing is that for peer-to-peer migration (and tunnelled one is currently a
> special case of it) the destination URI (qemu+ssh://kvm-03/system) is used by
> the source libvirt deamon to connect to the destination deamon. In case of
> normal migration or virsh connect, it is virsh, i.e., libvirt client, that
> initiates the connection. And libvirtd has no way of asking you for a password
> used when you ssh to kvm-03 nor does it have access to your ssh keys or
> kerberos tickets. In other words, for p2p migration, you need to use different
> transport than ssh.
> 
> Jirka


Thanks for explaining it in detail Jirka. That's helpful to know. 

--
Shantanu