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You must not have allow_resize_to_same_host set in nova.conf.

On 5/2/2012 11:02 AM, Nicolas Odermatt wrote:
>
> Hey guys,
>
> I'm playing aroung with the openstack api and I'm trying to change the 
> flavor of an instance. Thanks to the documentation I found the 
> necessary information to write the api call, which was done pretty 
> fast and easy. Sadly the api call has a secondary effect because after 
> the execution of the api call  the instance changes into the error state.
>
> I had a look into the nova-compute.log and this is what I found :
>
> /root at nova-controller:/etc/nova# tail -n20 
> /var/log/nova/nova-compute.log /
>
> /2012-05-02 14:47:18,887 DEBUG nova.rpc [-] unpacked context: 
> {'user_id': u'nodermatt', 'roles': [u'Admin'], 'timestamp': 
> u'2012-05-02T14:47:18.558838', 'auth_token': 
> u'be66c633-9a8d-47eb-a095-9b653375b138', 'msg_id': None, 
> 'remote_address': u'192.168.7.106', 'strategy': u'keystone', 
> 'is_admin': True, 'request_id': 
> u'744129f2-17d9-4756-a276-548ad6dfe975', 'project_id': u'2', 
> 'read_deleted': False} from (pid=1496) _unpack_context 
> /var/lib/nova/nova/rpc/impl_kombu.py:646/
>
> /2012-05-02 14:47:18,888 INFO nova.compute.manager 
> [744129f2-17d9-4756-a276-548ad6dfe975 nodermatt 2] 
> check_instance_lock: decorating: |<function prep_resize at 0x253ecf8>|/
>
> /2012-05-02 14:47:18,889 INFO nova.compute.manager 
> [744129f2-17d9-4756-a276-548ad6dfe975 nodermatt 2] 
> check_instance_lock: arguments: |<nova.compute.manager.ComputeManager 
> object at 0x1d85e10>| |<nova.rpc.impl_kombu.RpcContext object at 
> 0x3cc1c90>| |ff8f4521-fbc2-45e3-91ac-de395a7a1331|/
>
> /2012-05-02 14:47:18,889 DEBUG nova.compute.manager 
> [744129f2-17d9-4756-a276-548ad6dfe975 nodermatt 2] instance 
> ff8f4521-fbc2-45e3-91ac-de395a7a1331: getting locked state from 
> (pid=1496) get_lock /var/lib/nova/nova/compute/manager.py:1199/
>
> /2012-05-02 14:47:18,946 INFO nova.compute.manager 
> [744129f2-17d9-4756-a276-548ad6dfe975 nodermatt 2] 
> check_instance_lock: locked: |False|/
>
> /2012-05-02 14:47:18,946 INFO nova.compute.manager 
> [744129f2-17d9-4756-a276-548ad6dfe975 nodermatt 2] 
> check_instance_lock: admin: |True|/
>
> /2012-05-02 14:47:18,946 INFO nova.compute.manager 
> [744129f2-17d9-4756-a276-548ad6dfe975 nodermatt 2] 
> check_instance_lock: executing: |<function prep_resize at 0x253ecf8>|/
>
> /2012-05-02 14:47:19,124 ERROR nova.rpc 
> [744129f2-17d9-4756-a276-548ad6dfe975 nodermatt 2] Exception during 
> message handling/
>
> /(nova.rpc): TRACE: Traceback (most recent call last):/
>
> /(nova.rpc): TRACE:   File "/var/lib/nova/nova/rpc/impl_kombu.py", 
> line 620, in _process_data/
>
> /(nova.rpc): TRACE:     rval = node_func(context=ctxt, **node_args)/
>
> /(nova.rpc): TRACE:   File "/var/lib/nova/nova/exception.py", line 
> 100, in wrapped/
>
> /(nova.rpc): TRACE:     return f(*args, **kw)/
>
> /(nova.rpc): TRACE:   File "/var/lib/nova/nova/compute/manager.py", 
> line 118, in decorated_function/
>
> /(nova.rpc): TRACE:     function(self, context, instance_id, *args, 
> **kwargs)/
>
> /(nova.rpc): TRACE:   File "/var/lib/nova/nova/compute/manager.py", 
> line 965, in prep_resize/
>
> /(nova.rpc): TRACE:     raise exception.Error(msg)/
>
> /(nova.rpc): TRACE: Error: Migration error: destination same as source!/
>
> /(nova.rpc): TRACE: /
>
> /2012-05-02 14:48:00,294 INFO nova.compute.manager 
> [28207266-3917-4c91-b0d8-4afa36f7c018 None None] Updating host status/
>
> //
>
> Also a thread on the openstack forum and a bug on launchpad raised my 
> curiosity.
>
> Forum thread : http://forums.openstack.org/viewtopic.php?f=10&t=693
>
> Launchpad: https://lists.launchpad.net/openstack/msg05540.html
>
> For the record here is the code:
>
> /curl -v -H "X-Auth-Token:4963437d-0a6a-4302-a4ff-f3be191fbc1d" 
> http://192.168.7.211:8774/v1.1/2/servers/3/action -d '{"resize" : 
> {"flavorRef" : "2"}}' -H 'Content-type:application/json' | python -m 
> json.tool/
>
> The machine, on which I am working, is a single node stackops deployment.
>
> Does someone has an idea what may be the cause of the error?
>
> Have a good day,
>
> Nicolas
>
>
>
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