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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 for each tenant can be controlled so that cloud resources are optimized. Quotas can be enforced at both the tenant (or project) and the tenant-user level. Typically, you change quotas when a project needs more than ten volumes or 1 TB on a compute node. Using the Dashboard, you can view default Compute and Block Storage quotas for new tenants, as well as update quotas for existing tenants. Using the command-line interface, you can manage quotas for the OpenStack Compute service, the OpenStack Block Storage service, and the OpenStack Networking service (see ). Additionally, you can update Compute service quotas for tenant users. The following table describes the Compute and Block Storage service quotas:

Quota Descriptions

Quota Name	Defines the number of	Service
Gigabytes	Volume gigabytes allowed for each project.	Block Storage
Instances	Instances allowed for each project.	Compute
Injected Files	Injected files allowed for each project.	Compute
Injected File Content Bytes	Content bytes allowed for each injected file.	Compute
Keypairs	Number of keypairs.	Compute
Metadata Items	Metadata items allowed for each instance.	Compute
RAM (MB)	RAM megabytes allowed for each instance.	Compute
Security Groups	Security groups allowed for each project.	Compute
Security Group Rules	Rules allowed for each security group.	Compute
Snapshots	Volume snapshots allowed for each project.	Block Storage
VCPUs	Instance cores allowed for each project.	Compute
Volumes	Volumes allowed for each project.	Block Storage

Log in to the OpenStack dashboard. On the Admin tab, click the Defaults category. The default quota values are displayed. You can sort the table by clicking on either the Quota Name or Limit column headers.

Log in to the OpenStack dashboard. On the Admin tab, click the Defaults category. Click the Update Defaults button. In the Update Default Quotas window, you can edit the default quota values. Click the Update Defaults button. The dashboard does not show all possible project quotas. To view and update the quotas for a service, use its command-line client. See .