Open Stack

 Is volume attachment to an LXC instance is broken?

 I'm trying to run the following command:
$ euca-attach-volume vol-00000007 -i i-0000000b -d /dev/vdc

It fails and the nova-compute log is copied and pasted below.
The error message is : 
  "InvalidDevicePath: The supplied device path (/dev/a) is invalid."
The device name given is "/dev/vdc", but it looks like that get_device_name_for_instance()
changes it to '/dev/a'.
And it ends up the error of "InvalidDevicePath".

Is it bug or my mistake?
I pulled the nova from github on August 29th.
And the followings are configured in /etc/nova/nova.conf file.
  use_cow_images=True
  libvirt_type=lxc

 Thanks,
 David

------------- log of nova-compute ---------------

2012-09-04 13:37:46 DEBUG nova.utils [req-79250a0b-6c11-4afc-a0a4-75736d3853c5 admin admin] Got semaphore "f3fb4350-a72e-404f-a21f-10f333fe67e8" for method "do_reserve"... from (pid=13108) inner /usr/local/nova/nova/utils.py:712
2012-09-04 13:37:46 DEBUG nova.utils [req-79250a0b-6c11-4afc-a0a4-75736d3853c5 admin admin] Attempting to grab semaphore "compute_resources" for method "update_load_stats_for_instance"... from (pid=13108) inner /usr/local/nova/nova/utils.py:708
2012-09-04 13:37:46 DEBUG nova.utils [req-79250a0b-6c11-4afc-a0a4-75736d3853c5 admin admin] Got semaphore "compute_resources" for method "update_load_stats_for_instance"... from (pid=13108) inner /usr/local/nova/nova/utils.py:712
2012-09-04 13:37:46 ERROR nova.openstack.common.rpc.amqp [-] Exception during message handling
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp Traceback (most recent call last):
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp   File "/usr/local/nova/nova/openstack/common/rpc/amqp.py", line 275, in _process_data
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp     rval = self.proxy.dispatch(ctxt, version, method, **args)
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp   File "/usr/local/nova/nova/openstack/common/rpc/dispatcher.py", line 145, in dispatch
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp     return getattr(proxyobj, method)(ctxt, **kwargs)
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp   File "/usr/local/nova/nova/exception.py", line 117, in wrapped
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp     temp_level, payload)
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib64/python2.6/contextlib.py", line 23, in __exit__
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp     self.gen.next()
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp   File "/usr/local/nova/nova/exception.py", line 92, in wrapped
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp     return f(*args, **kw)
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp   File "/usr/local/nova/nova/compute/manager.py", line 211, in decorated_function
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp     pass
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib64/python2.6/contextlib.py", line 23, in __exit__
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp     self.gen.next()
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp   File "/usr/local/nova/nova/compute/manager.py", line 204, in decorated_function
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp     return function(self, context, *args, **kwargs)
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp   File "/usr/local/nova/nova/compute/manager.py", line 237, in decorated_function
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp     instance_uuid, e, sys.exc_info())
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib64/python2.6/contextlib.py", line 23, in __exit__
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp     self.gen.next()
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp   File "/usr/local/nova/nova/compute/manager.py", line 226, in decorated_function
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp     return function(self, context, *args, **kwargs)
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp   File "/usr/local/nova/nova/compute/manager.py", line 2057, in reserve_block_device_name
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp     return do_reserve()
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp   File "/usr/local/nova/nova/utils.py", line 733, in inner
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp     retval = f(*args, **kwargs)
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp   File "/usr/local/nova/nova/compute/manager.py", line 2051, in do_reserve
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp     device)
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp   File "/usr/local/nova/nova/compute/utils.py", line 56, in get_device_name_for_instance
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp     raise exception.InvalidDevicePath(path=mappings['root'])
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp InvalidDevicePath: The supplied device path (/dev/a) is invalid.
2012-09-04 13:37:46 TRACE nova.openstack.common.rpc.amqp
2012-09-04 13:37:46 ERROR nova.openstack.common.rpc.common [-] Returning exception The supplied device path (/dev/a) is invalid. to caller
2012-09-04 13:37:46 ERROR nova.openstack.common.rpc.common [-] ['Traceback (most recent call last):\n', '  File "/usr/local/nova/nova/openstack/common/rpc/amqp.py", line 275, in _process_data\n    rval = self.proxy.dispatch(ctxt, version, method, **args)\n', '  File "/usr/local/nova/nova/openstack/common/rpc/dispatcher.py", line 145, in dispatch\n    return getattr(proxyobj, method)(ctxt, **kwargs)\n', '  File "/usr/local/nova/nova/exception.py", line 117, in wrapped\n    temp_level, payload)\n', '  File "/usr/lib64/python2.6/contextlib.py", line 23, in __exit__\n    self.gen.next()\n', '  File "/usr/local/nova/nova/exception.py", line 92, in wrapped\n    return f(*args, **kw)\n', '  File "/usr/local/nova/nova/compute/manager.py", line 211, in decorated_function\n    pass\n', '  File "/usr/lib64/python2.6/contextlib.py", line 23, in __exit__\n    self.gen.next()\n', '  File "/usr/local/nova/nova/compute/manager.py", line 204, in decorated_function\n    return function(self, context, *args, **kwargs)\n', '  File "/usr/local/nova/nova/compute/manager.py", line 237, in decorated_function\n    instance_uuid, e, sys.exc_info())\n', '  File "/usr/lib64/python2.6/contextlib.py", line 23, in __exit__\n    self.gen.next()\n', '  File "/usr/local/nova/nova/compute/manager.py", line 226, in decorated_function\n    return function(self, context, *args, **kwargs)\n', '  File "/usr/local/nova/nova/compute/manager.py", line 2057, in reserve_block_device_name\n    return do_reserve()\n', '  File "/usr/local/nova/nova/utils.py", line 733, in inner\n    retval = f(*args, **kwargs)\n', '  File "/usr/local/nova/nova/compute/manager.py", line 2051, in do_reserve\n    device)\n', '  File "/usr/local/nova/nova/compute/utils.py", line 56, in get_device_name_for_instance\n    raise exception.InvalidDevicePath(path=mappings[\'root\'])\n', 'InvalidDevicePath: The supplied device path (/dev/a) is invalid.\n']



----------------------
Dr. Dong-In "David" Kang
Computer Scientist
USC/ISI