If server is created with 'image' as Boot Source and for Create New Volume 'No' is selected then boot volume of the server is not created via Cinder but via Nova. It is not visible via cinder API. How do I list/view such a volume via OpenStack API?
It is not a volume, but ephemeral storage, and can’t be listed separately from the instance.
It can't be viewed or listed, and it can't be created either. There is no API for ephemeral storage.
Or: It can be created, viewed or listed by creating, viewing or listing the instance that uses it.
See it this way. Like CPU or RAM, ephemeral storage doesn't exist on its own. It's part of an instance. It doesn't have an ID, it is created and removed together with the instance. A volume, on the other hand, is an independent resource with an ID and an API.
Well, if the flavor specifies a disk size of 0, the disk should have a size of 0 I would think. Why should the disk’s size differ from the flavor?
A flavor with disk size 0 can be used for a diskless instance or an instance that boots from volume.
You can find them in
/var/lib/nova/instances It is not volume you build them on flavor
Unfortunately nova can be configured in a way that enables nova API to create ephemeral root volume with size that is not limited/determined by flavor but it provides no way how to view such a root disk. Telemetry API may be able to provide info on such a disk including size.
Asked: 2018-11-20 09:57:22 -0500
Seen: 569 times
Last updated: Nov 22 '18
