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Thank you so much for you guys help.
I will do these later.

Actually this problem can be reproduced in my Essex environment, and I have
no idea about how to figure out why it happened, but I'd like to try it. It
is highly appreciated if someone can give me some suggestions.

Thanks,
Sam

On Tue, Aug 28, 2012 at 11:08 PM, Trinath Somanchi <
trinath.somanchi at gmail.com> wrote:

> Hi-
>
> A solution would be deleting the instance table record.
>
> Instances table in database has two relational tables.
>
> [1] security_group_instance_association
> [2] instance_info_caches
> along with the tuples from instances table.
>
> -
> TNS
>
>
> On Wed, Aug 29, 2012 at 11:00 AM, Emilien Macchi <
> emilien.macchi at stackops.com> wrote:
>
>> Hi,
>>
>> I think the best way is to delete the instance from the database :
>> Look at the "nova" database and "fixed_ips" table.
>>
>> If you have the old instance number here, try put the "instance_id" filed
>> into NULL where instance_id is 603.
>>
>> If you have still this issue, find every field corresponding to 603 into
>> the database and delete it.
>>
>> Restart nova-api service, and that should be good.
>>
>>
>> Good luck !
>>
>>
>> Regards
>>
>> On Wed, Aug 29, 2012 at 4:44 AM, Sam Su <susltd.su at gmail.com> wrote:
>>
>>> Hi,
>>>
>>> I have an Essex cluster with 6 compute nodes and one control node, and
>>> it worked fine in the past several months. Last week, since someone deleted
>>> an instance in a project, no new instance can be launched in that project.
>>>
>>> When create a new instance in the project, it displays:
>>> *Error: *An error occurred. Please try again.
>>>
>>> the following error info will come up in the file nova-api.log:
>>> 2012-08-28 19:14:23 ERROR nova.api.openstack
>>> [req-6fb211c1-60cf-4a69-83e1-f9e7da30b458 6023cea36f784448b667922894ca7102
>>> afdee06258774b2d9e768c08b62dbbf2] Caught error: Remote error:
>>> InstanceNotFound Instance 603 could not be found.
>>>
>>> Here is the info of nova-api.log :
>>> http://pastebin.com/evuDMdrU
>>> .
>>>
>>> Actually this instance with id 603 has been deleted, it's very strange.
>>> Does anyone has any idea about this issue?
>>>
>>> By the way, if an existing instance in another project is terminated,
>>> the same problem occurs in that project.
>>>
>>> Thanks ahead,
>>> Sam
>>>
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>>
>>
>> --
>> Emilien Macchi
>> *System Engineer*
>> *www.stackops.com
>>
>> | *emilien.macchi at stackops.com**  *|* skype:emilien.macchi*
>> * <http://www.stackops.com>
>> *
>>
>> *
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>
>
> --
> Regards,
> ----------------------------------------------
> Trinath Somanchi,
> +91 9866 235 130
>
>
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