To prevent system capacities from being exhausted without notification, you can set up quotas. Quotas are operational limits. For example, the number of gigabytes allowed per tenant can be controlled so that cloud resources are optimized. Quotas are currently enforced at the tenant (or project) level, rather than by user. For example, a default value might be changed because a tenant requires more than 1TB on a Compute node. To view all tenants, run: $ keystone tenant-list +----------------------------------+----------+---------+ | id | name | enabled | +----------------------------------+----------+---------+ | a981642d22c94e159a4a6540f70f9f8d | admin | True | | 934b662357674c7b9f5e4ec6ded4d0e7 | tenant01 | True | | 7bc1dbfd7d284ec4a856ea1eb82dca80 | tenant02 | True | | 9c554aaef7804ba49e1b21cbd97d218a | services | True | +----------------------------------+----------+---------+