Manage Networking service quotas

A quota limits the number of available resources. A default quota might be enforced for all tenants. When you try to create more resources than the quota allows, an error occurs:

$ neutron net-create test_net
 Quota exceeded for resources: ['network']

Per-tenant quota configuration is also supported by the quota extension API. See cfg_quotas_per_tenant for details.

Basic quota configuration

In the Networking default quota mechanism, all tenants have the same quota values, such as the number of resources that a tenant can create.

The quota value is defined in the OpenStack Networking neutron.conf configuration file. To disable quotas for a specific resource, such as network, subnet, or port, remove a corresponding item from quota_items. This example shows the default quota values:

[quotas]
# resource name(s) that are supported in quota features
quota_items = network,subnet,port

# number of networks allowed per tenant, and minus means unlimited
quota_network = 10

# number of subnets allowed per tenant, and minus means unlimited
quota_subnet = 10

# number of ports allowed per tenant, and minus means unlimited
quota_port = 50

# default driver to use for quota checks
quota_driver = neutron.quota.ConfDriver

OpenStack Networking also supports quotas for L3 resources: router and floating IP. Add these lines to the quotas section in the neutron.conf file:

[quotas]
# number of routers allowed per tenant, and minus means unlimited
quota_router = 10

# number of floating IPs allowed per tenant, and minus means unlimited
quota_floatingip = 50

note

The quota_items option does not affect these quotas.

OpenStack Networking also supports quotas for security group resources: number of security groups and the number of rules for each security group. Add these lines to the quotas section in the neutron.conf file:

[quotas]
# number of security groups per tenant, and minus means unlimited
quota_security_group = 10

# number of security rules allowed per tenant, and minus means unlimited
quota_security_group_rule = 100

note

The quota_items option does not affect these quotas.

Configure per-tenant quotas

OpenStack Networking also supports per-tenant quota limit by quota extension API.

Use these commands to manage per-tenant quotas:

neutron quota-delete

Delete defined quotas for a specified tenant

neutron quota-list

Lists defined quotas for all tenants

neutron quota-show

Shows quotas for a specified tenant

neutron quota-update

Updates quotas for a specified tenant

Only users with the admin role can change a quota value. By default, the default set of quotas are enforced for all tenants, so no quota-create command exists.

  1. Configure Networking to show per-tenant quotas

    Set the quota_driver option in the neutron.conf file.

    quota_driver = neutron.db.quota_db.DbQuotaDriver
    

    When you set this option, the output for Networking commands shows quotas.

  2. List Networking extensions.

    To list the Networking extensions, run this command:

    $ neutron ext-list -c alias -c name
    

    The command shows the quotas extension, which provides per-tenant quota management support.

    +-----------------+--------------------------+
    | alias           | name                     |
    +-----------------+--------------------------+
    | agent_scheduler | Agent Schedulers         |
    | security-group  | security-group           |
    | binding         | Port Binding             |
    | quotas          | Quota management support |
    | agent           | agent                    |
    | provider        | Provider Network         |
    | router          | Neutron L3 Router        |
    | lbaas           | LoadBalancing service    |
    | extraroute      | Neutron Extra Route      |
    +-----------------+--------------------------+
    
  3. Show information for the quotas extension.

    To show information for the quotas extension, run this command:

    $ neutron ext-show quotas
    +-------------+------------------------------------------------------------+
    | Field       | Value                                                      |
    +-------------+------------------------------------------------------------+
    | alias       | quotas                                                     |
    | description | Expose functions for quotas management per tenant          |
    | links       |                                                            |
    | name        | Quota management support                                   |
    | namespace   | http://docs.openstack.org/network/ext/quotas-sets/api/v2.0 |
    | updated     | 2012-07-29T10:00:00-00:00                                  |
    +-------------+------------------------------------------------------------+
    

    note

    Only some plug-ins support per-tenant quotas. Specifically, Open vSwitch, Linux Bridge, and VMware NSX support them, but new versions of other plug-ins might bring additional functionality. See the documentation for each plug-in.

  4. List tenants who have per-tenant quota support.

    The quota-list command lists tenants for which the per-tenant quota is enabled. The command does not list tenants with default quota support. You must be an administrative user to run this command:

    $ neutron quota-list
    +------------+---------+------+--------+--------+----------------------------------+
    | floatingip | network | port | router | subnet | tenant_id                        |
    +------------+---------+------+--------+--------+----------------------------------+
    |         20 |       5 |   20 |     10 |      5 | 6f88036c45344d9999a1f971e4882723 |
    |         25 |      10 |   30 |     10 |     10 | bff5c9455ee24231b5bc713c1b96d422 |
    +------------+---------+------+--------+--------+----------------------------------+
    
  5. Show per-tenant quota values.

    The quota-show command reports the current set of quota limits for the specified tenant. Non-administrative users can run this command without the –tenant_id parameter. If per-tenant quota limits are not enabled for the tenant, the command shows the default set of quotas.

    $ neutron quota-show --tenant_id 6f88036c45344d9999a1f971e4882723
    +------------+-------+
    | Field      | Value |
    +------------+-------+
    | floatingip | 20    |
    | network    | 5     |
    | port       | 20    |
    | router     | 10    |
    | subnet     | 5     |
    +------------+-------+
    

    The following command shows the command output for a non-administrative user.

    $ neutron quota-show
    +------------+-------+
    | Field      | Value |
    +------------+-------+
    | floatingip | 20    |
    | network    | 5     |
    | port       | 20    |
    | router     | 10    |
    | subnet     | 5     |
    +------------+-------+
    
  6. Update quota values for a specified tenant.

    Use the quota-update command to update a quota for a specified tenant.

    $ neutron quota-update --tenant_id 6f88036c45344d9999a1f971e4882723 --network 5
    +------------+-------+
    | Field      | Value |
    +------------+-------+
    | floatingip | 50    |
    | network    | 5     |
    | port       | 50    |
    | router     | 10    |
    | subnet     | 10    |
    +------------+-------+
    

    You can update quotas for multiple resources through one command.

    $ neutron quota-update --tenant_id 6f88036c45344d9999a1f971e4882723 --subnet 5 --port 20
    +------------+-------+
    | Field      | Value |
    +------------+-------+
    | floatingip | 50    |
    | network    | 5     |
    | port       | 20    |
    | router     | 10    |
    | subnet     | 5     |
    +------------+-------+
    

    To update the limits for an L3 resource such as, router or floating IP, you must define new values for the quotas after the -- directive.

    This example updates the limit of the number of floating IPs for the specified tenant.

    $ neutron quota-update --tenant_id 6f88036c45344d9999a1f971e4882723 --floatingip 20
    +------------+-------+
    | Field      | Value |
    +------------+-------+
    | floatingip | 20    |
    | network    | 5     |
    | port       | 20    |
    | router     | 10    |
    | subnet     | 5     |
    +------------+-------+
    

    You can update the limits of multiple resources by including L2 resources and L3 resource through one command:

    $ neutron quota-update --tenant_id 6f88036c45344d9999a1f971e4882723
    --network 3 --subnet 3 --port 3 --floatingip 3 --router 3
    +------------+-------+
    | Field      | Value |
    +------------+-------+
    | floatingip | 3     |
    | network    | 3     |
    | port       | 3     |
    | router     | 3     |
    | subnet     | 3     |
    +------------+-------+
    
  7. Delete per-tenant quota values.

    To clear per-tenant quota limits, use the quota-delete command.

    $ neutron quota-delete --tenant_id 6f88036c45344d9999a1f971e4882723
     Deleted quota: 6f88036c45344d9999a1f971e4882723
    

    After you run this command, you can see that quota values for the tenant are reset to the default values.

    $ neutron quota-show --tenant_id 6f88036c45344d9999a1f971e4882723
    +------------+-------+
    | Field      | Value |
    +------------+-------+
    | floatingip | 50    |
    | network    | 10    |
    | port       | 50    |
    | router     | 10    |
    | subnet     | 10    |
    +------------+-------+