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> I try to assign quota to individual users, to control how many
> instances
> each user can run concurrently. But I don't see a doc describing how
> to
> do that. I use diablo release.
> Any help or doc pointer will be greatly appreciated.


Quotas apply at the nova project/tenant granularity, as opposed to an individual user.

Project-specific quotas may be set via the nova CLI, e.g.

  $ nova quota-update <tenant_ID> --instances=50

otherwise the configured default quota is inherited.

Since you're still on diablo, the new quota classes mechanism would not be relevant.

Cheers,
Eoghan