The simultaneous launch of two or more VMs will fail

[Charlotte Han]

Using dashboard launching VMs, the setting is that 'Instance Count : 2, Instance Boot Source : Boot from image'. After clicking the button of 'launch', the simultaneous launch of two VMs failed.

the nova-api.log shows as follows.
"/usr/lib/python2.7/site-packages/nova/compute/api.py", line 1356, in create
2014-08-05 21:47:46.117 25518 TRACE nova.api.openstack self._check_multiple_instances_neutron_ports(requested_networks)
2014-08-05 21:47:46.117 25518 TRACE nova.api.openstack File "/usr/lib/python2.7/site-packages/nova/compute/api.py", line 1327, in _check_multiple_instances_neutron_ports
2014-08-05 21:47:46.117 25518 TRACE nova.api.openstack for net, ip, port in requested_networks:
2014-08-05 21:47:46.117 25518 TRACE nova.api.openstack ValueError: too many values to unpack

[Charlotte Han (hanrong)]

beacause of the error log 'too many values to unpack', I modifed the code of 'for (net, ip, port) in requested_networks:' to 'for (net, ip, port, vnic_type) in requested_networks:' in nova/compute/api.py, and the simultaneous launch of two VMs successed.

[Sahid Orentino (sahid-ferdjaoui)]

Can you confirm that you are using Neutron?

[Charlotte Han (hanrong)]

Yes, I am using Neutron.

The path of assigning value to the parameter "requested_networks" is as follows:

Class : "nova.api.openstack.compute.servers.Controller"

Function : "def _get_requested_networks(self, requested_networks):"

Statement :
"if utils.is_neutron():
    networks.append((network_uuid, address, port_id, vnic_type))"

[Robert Collins (lifeless)]

I believe this is fixed in trunk, using attribute access rather than tuple unpacking.

[Davanum Srinivas (DIMS) (dims-v)]

marking as fix committed per lifeless.