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Message #12079
[Bug 1075971] Re: Attach volume with libvirt disregards target device but still reserves it
Since it is now possible to both boot instances and attach volumes
without specifying device names after
https://blueprints.launchpad.net/nova/+spec/improve-block-device-
handling BP has been implemented. in which case the device names will be
handled properly by Nova.
It is still possible to supply device names (for backwards
compatibility's sake), which would cause the same behavior as described
above. This is really an issue due to the fact that there is no way to
make sure libvirt uses the same device name as supplied to it since
libvirt only takes this as ordering hints. the best solution really _is_
to rely on Nova to actually choose the device name as per implemented
BP.
** Changed in: nova
Status: Confirmed => Won't Fix
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https://bugs.launchpad.net/bugs/1075971
Title:
Attach volume with libvirt disregards target device but still reserves
it
Status in OpenStack Compute (Nova):
Won't Fix
Bug description:
Running devstack with libvirt/qemu - the problem is that attaching a
volume (either by passing it with --block_device_mapping to boot or by
using nova volume-attach) completely disregards the device name passed
as can be seen fromt the folloowng shell session. However the device
remains reserved so subsequent attach attempts will fail on the
specified device, and succeed with some other given (which will not be
honored again).
The following session is how to reproduce it:
[ndipanov@devstack devstack]$ cinder list
+--------------------------------------+-----------+--------------+------+-------------+-------------+
| ID | Status | Display Name | Size | Volume Type | Attached to |
+--------------------------------------+-----------+--------------+------+-------------+-------------+
| 5792f1ed-c5f7-40c6-913f-43aa66c717c7 | available | bootable | 3 | None | |
| abc77933-119b-4105-b085-092c93be36f5 | available | blank_2 | 1 | None | |
| b4de941a-627c-447a-9226-456159d95173 | available | blank | 1 | None | |
+--------------------------------------+-----------+--------------+------+-------------+-------------+
[ndipanov@devstack devstack]$ nova list
[ndipanov@devstack devstack]$ nova boot --image c346fdd1-d438-472b-98f5-b4c5f2b716f8 --flavor 1 --block_device_mapping vdr=b4de941a-627c-447a-9226-456159d95173:::0 --key_name nova_key w_vol
+------------------------+--------------------------------------+
| Property | Value |
+------------------------+--------------------------------------+
| OS-DCF:diskConfig | MANUAL |
| OS-EXT-STS:power_state | 0 |
| OS-EXT-STS:task_state | scheduling |
| OS-EXT-STS:vm_state | building |
| accessIPv4 | |
| accessIPv6 | |
| adminPass | CqgT4dXkq64t |
| config_drive | |
| created | 2012-11-07T14:02:00Z |
| flavor | m1.tiny |
| hostId | |
| id | caa459d5-27ae-4c5b-b190-fd740054a2ec |
| image | cirros-0.3.0-x86_64-uec |
| key_name | nova_key |
| metadata | {} |
| name | w_vol |
| progress | 0 |
| security_groups | [{u'name': u'default'}] |
| status | BUILD |
| tenant_id | 5f68e605463940dda20e876604385c43 |
| updated | 2012-11-07T14:02:01Z |
| user_id | 104895e85fe54ae5a2cc5c5a650f50b0 |
+------------------------+--------------------------------------+
[ndipanov@devstack devstack]$ nova list
+--------------------------------------+-------+--------+------------------+
| ID | Name | Status | Networks |
+--------------------------------------+-------+--------+------------------+
| caa459d5-27ae-4c5b-b190-fd740054a2ec | w_vol | ACTIVE | private=10.0.0.2 |
+--------------------------------------+-------+--------+------------------+
[ndipanov@devstack devstack]$ ssh -o StrictHostKeyChecking=no -i nova_key.priv cirros@10.0.0.2
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
57:ca:fe:e8:4f:b6:30:5a:06:20:d4:37:ed:06:aa:c8.
Please contact your system administrator.
Add correct host key in /home/ndipanov/.ssh/known_hosts to get rid of this message.
Offending RSA key in /home/ndipanov/.ssh/known_hosts:2
Password authentication is disabled to avoid man-in-the-middle attacks.
Keyboard-interactive authentication is disabled to avoid man-in-the-middle attacks.
$ cat /proc/partitions
major minor #blocks name
253 0 24576 vda
253 16 1048576 vdb
$ ls -la /dev | grep vd.*
lrwxrwxrwx 1 root root 3 Nov 7 07:03 root -> vda
brw------- 1 root root 253, 0 Nov 7 07:02 vda
brw------- 1 root root 253, 16 Nov 7 07:02 vdb
$ Connection to 10.0.0.2 closed.
[ndipanov@devstack devstack]$ cinder list
+--------------------------------------+-----------+--------------+------+-------------+--------------------------------------+
| ID | Status | Display Name | Size | Volume Type | Attached to |
+--------------------------------------+-----------+--------------+------+-------------+--------------------------------------+
| 5792f1ed-c5f7-40c6-913f-43aa66c717c7 | available | bootable | 3 | None | |
| abc77933-119b-4105-b085-092c93be36f5 | available | blank_2 | 1 | None | |
| b4de941a-627c-447a-9226-456159d95173 | in-use | blank | 1 | None | caa459d5-27ae-4c5b-b190-fd740054a2ec |
+--------------------------------------+-----------+--------------+------+-------------+--------------------------------------+
(reverse-i-search)`vol': nova boot --image c346fdd1-d438-472b-98f5-b4c5f2b716f8 --flavor 1 --block_device_mapping vdr=b4de941a-627c-447a-9226-456159d95173:::0 --key_name nova_key w_^Cl
[ndipanov@devstack devstack]$ nova volume-attach w_vol abc77933-119b-4105-b085-092c93be36f5 /dev/vdr
ERROR: The supplied device path (/dev/vda) is in use.
Traceback (most recent call last):
File "/opt/stack/nova/nova/openstack/common/rpc/amqp.py", line 276, in _process_data
rval = self.proxy.dispatch(ctxt, version, method, **args)
File "/opt/stack/nova/nova/openstack/common/rpc/dispatcher.py", line 145, in dispatch
return getattr(proxyobj, method)(ctxt, **kwargs)
File "/opt/stack/nova/nova/exception.py", line 117, in wrapped
temp_level, payload)
File "/usr/lib64/python2.7/contextlib.py", line 24, in __exit__
self.gen.next()
File "/opt/stack/nova/nova/exception.py", line 92, in wrapped
return f(*args, **kw)
File "/opt/stack/nova/nova/compute/manager.py", line 175, in decorated_function
pass
File "/usr/lib64/python2.7/contextlib.py", line 24, in __exit__
self.gen.next()
File "/opt/stack/nova/nova/compute/manager.py", line 161, in decorated_function
return function(self, context, *args, **kwargs)
File "/opt/stack/nova/nova/compute/manager.py", line 202, in decorated_function
kwargs['instance']['uuid'], e, sys.exc_info())
File "/usr/lib64/python2.7/contextlib.py", line 24, in __exit__
self.gen.next()
File "/opt/stack/nova/nova/compute/manager.py", line 190, in decorated_function
return function(self, context, *args, **kwargs)
File "/opt/stack/nova/nova/compute/manager.py", line 2167, in reserve_block_device_name
return do_reserve()
File "/opt/stack/nova/nova/openstack/common/lockutils.py", line 229, in inner
retval = f(*args, **kwargs)
File "/opt/stack/nova/nova/compute/manager.py", line 2160, in do_reserve
device)
File "/opt/stack/nova/nova/compute/utils.py", line 110, in get_device_name_for_instance
raise exception.DevicePathInUse(path=device)
DevicePathInUse: The supplied device path (/dev/vda) is in use.
(HTTP 400) (Request-ID: req-76852a0d-1c70-4e11-879c-0089956ba02e)
[ndipanov@devstack ~]$ nova volume-attach w_vol abc77933-119b-4105-b085-092c93be36f5 /dev/vdc
+----------+--------------------------------------+
| Property | Value |
+----------+--------------------------------------+
| device | /dev/vdc |
| id | abc77933-119b-4105-b085-092c93be36f5 |
| serverId | caa459d5-27ae-4c5b-b190-fd740054a2ec |
| volumeId | abc77933-119b-4105-b085-092c93be36f5 |
+----------+--------------------------------------+
This seems to be somehow related to the changes introduced by https://bugs.launchpad.net/nova/+bug/1004328
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