openstack-aps-package-dev team mailing list archive

[Dmitry Savenkov <dsavenkov@xxxxxxxxxxxx>]

Andrey:

Today I was successfully able to get our OpenStack experts to reply to the
questions that had been triggered by our recent meeting. I will list the
questions below along with replies to them. Please mind that I didn't test
the APIs that could retrieve some values, so it's up to *Mamasu *to do that
and let me know the results.


*The questions are:*
1) Find out if an image that is being used by a VM/server can be removed
from OpenStack via Glance (or if there are any APIs enabling the user to do
so).

2) Can RAM/CPU/other parameters can be retrieved in OpenStack from a
template by means of any APIs?

3) Image: What type of information can be retrieved re an image (OS/ all
the possible parameters) - metadata ?


*Please see the replies below:*
1) it's possible to remove an image that is being referenced by any
VM/instance via Glance/API (an image is copied to a compute node when it's
provisioned). The folder is: instance/_base‏

2)  it's also possible to get various flavor parameters by invoking *nova
flavor-list*‏ (http://developer.openstack.org/api-ref-compute-v2.html).

*/v2/{tenant_id}/flavors/detail* needs to be called. *minRam *and
*minDisk *parameters
can be specified. However, I am not sure why the 'min' prefix is in place..
Will try to clarify this with our OpenStack experts.

*vcpu (number of cores), ram, disk can be retrieved (response json)*

3) There is an image API enabling the retrieval of an image parameters. A
link to it is here: http://developer.openstack.org/api-ref-image-v2.html.
However, neither OS nor the number of instances are in the list (only
the *image
link prop* is in the main list).

The number of instances using an image can be retrieved by invoking the
following: *nova list --all-tenants --image <image_UUID>*. The API
reference is here:http://developer.openstack.org/api-ref-compute-v2.html.

In order to retrieve the OS, please take a look at *xsd:dict Properties*
key-value tags. It should be contained there (according to our specialist).


*A question for Andrey: Andrey, do you have access to our Jira? If so, I
would be able to share our tickets containing questions with you. It would
be more convenient.*
Please let me know if there are any questions in this regards.

Thanks.

Kind Regards,
Dmitry.