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[Weiwen Chen <wei-wen.chen@xxxxxx>]

This is a problem:
# nova --insecure interface-attach cirros
ERROR: Failed to attach interface (HTTP 500) (Request-ID: req-0d424f10-0974-41cc-b1a6-9c945f96997c)

https://github.com/openstack/nova/blob/master/nova/compute/manager.py file has the check:
 if len(network_info) != 1:
            LOG.error(_('allocate_port_for_instance returned %(ports)s ports')
                      % dict(ports=len(network_info)))


However, in https://github.com/openstack/nova/blob/master/nova/network/neutronv2/api.py: _get_available_networks()
if no network specified, it will get all networks in the tenant.

If more than one network in the tenant, this will definitely causing the
above check failed.

** This bug is no longer a duplicate of bug 1245683
   interface-attach: raises 500 error if invalid network

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https://bugs.launchpad.net/bugs/1267723

Title:
  nova interface-attach doesn't work if port|network|fixed id is omitted

Status in OpenStack Compute (Nova):
  New

Bug description:
  when use  'interface-attach' to attach interface to a vm with
  port|network|fixed id is omitted, it will be success if there is one
  network in that tenant, but it will be failed if there are more than
  one network in that tenant, also, when nterface-attach faield, there
  will be residual port in neutron which will not automatically deleted
  , nova latest code has the same problem!

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