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Le 20/03/2013 13:24, Mohammed Amine SAYA a écrit :
> RuntimeError:
> Command: ['sudo', 'quantum-rootwrap', '/etc/quantum/rootwrap.conf', 'ovs-vsctl', '--', '--may-exist', 'add-port', 'br-ex', 'qg-32dd6c6b-b6', '--', 'set', 'Interface', 'qg-32dd6c6b-b6', 'type=internal', '--', 'set', 'Interface', 'qg-32dd6c6b-b6', 'external-ids:iface-id=32dd6c6b-b6e8-4dff-b0db-3d804805c4e4', '--', 'set', 'Interface', 'qg-32dd6c6b-b6', 'external-ids:iface-status=active', '--', 'set', 'Interface', 'qg-32dd6c6b-b6', 'external-ids:attached-mac=fa:16:3e:6f:1b:81']
> Exit code: 1
> Stdout: ''
> Stderr: 'sudo: no tty present and no askpass program specified\n'

The answer is here : 
http://www.lmgtfy.com/?q=sudo%3A+no+tty+present+and+no+askpass+program+specified

Are you trying to start the L3 agent thru ssh ?

-Sylvain