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Why is glance a separate service not part of Nova, since only Nova needs it?

asked 2015-07-10 08:23:27 -0500

hayderimran7 gravatar image

I'm curious to know why glance is a separate service, with endpoints and service users since its only needed by Nova, why not just make it a part of Nova then ?
whats the technical motivation of having a separate image registry service? when compared to AWS, they dont have a separate image service for vms..
i would really like and appreciate the details on it :)

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answered 2015-07-13 01:26:30 -0500

keeping separate service for separate tasks helps simplify design and development and improves api usability.

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answered 2015-07-11 07:40:32 -0500

While I am sure there were other motives for splitting the Image service from Nova, I can think of this: Cinder also needs Glance when creating a volume from an image. There may also be non-technical reasons related to the organisation of OpenStack development. Finally, by now Glance is becoming a repository for the metadata available for the various types of resources in a cloud (see, so that it is now potentially used by all other parts of OpenStack.

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Asked: 2015-07-10 08:23:27 -0500

Seen: 132 times

Last updated: Jul 13 '15