95 lines
4.7 KiB
ReStructuredText
95 lines
4.7 KiB
ReStructuredText
======
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Limits
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======
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Accounts may be pre-configured with a set of thresholds (or limits) to
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manage capacity and prevent abuse of the system. The system recognizes
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two kinds of limits: *rate limits* and *absolute limits*. Rate limits
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are thresholds that are reset after a certain amount of time passes.
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Absolute limits are fixed. Limits are configured by operators and may
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differ from one deployment of the OpenStack Compute service to
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another. Please contact your provider to determine the limits that
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apply to your account. Your provider may be able to adjust your
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account's limits if they are too low. Also see the API Reference for
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`*Limits* <http://developer.openstack.org/api-ref-compute-v2.html#compute_limits>`__.
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Rate limits
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~~~~~~~~~~~
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Rate limits are specified in terms of both a human-readable wild-card
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URI and a machine-processable regular expression. The human-readable
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limit is intended for displaying in graphical user interfaces. The
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machine-processable form is intended to be used directly by client
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applications.
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The regular expression boundary matcher "^" for the rate limit takes
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effect after the root URI path. For example, the regular expression
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^/servers would match the bolded portion of the following URI:
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https://servers.api.openstack.org/v2/3542812\ **/servers**.
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**Table: Sample rate limits**
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+------------+-------------------+----------------------+----------+
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| Verb | URI | RegEx | Default |
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+------------+-------------------+----------------------+----------+
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| **POST** | \* | .\* | 120/min |
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+------------+-------------------+----------------------+----------+
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| **POST** | \*/servers | ^/servers | 120/min |
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+------------+-------------------+----------------------+----------+
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| **PUT** | \* | .\* | 120/min |
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+------------+-------------------+----------------------+----------+
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| **GET** | \*changes-since\* | .\*changes-since.\* | 120/min |
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+------------+-------------------+----------------------+----------+
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| **DELETE** | \* | .\* | 120/min |
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+------------+-------------------+----------------------+----------+
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| **GET** | \*/os-fping\* | ^/os-fping | 12/min |
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+------------+-------------------+----------------------+----------+
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Rate limits are applied in order relative to the verb, going from least
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to most specific.
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In the event a request exceeds the thresholds established for your
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account, a 413 HTTP response is returned with a ``Retry-After`` header
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to notify the client when they can attempt to try again.
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Absolute limits
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~~~~~~~~~~~~~~~
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Absolute limits are specified as name/value pairs. The name of the
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absolute limit uniquely identifies the limit within a deployment. Please
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consult your provider for an exhaustive list of absolute limits names. An
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absolute limit value is always specified as an integer. The name of the
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absolute limit determines the unit type of the integer value. For
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example, the name maxServerMeta implies that the value is in terms of
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server metadata items.
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**Table: Sample absolute limits**
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+-------------------+-------------------+------------------------------------+
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| Name | Value | Description |
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+-------------------+-------------------+------------------------------------+
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| maxTotalRAMSize | 51200 | Maximum total amount of RAM (MB) |
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+-------------------+-------------------+------------------------------------+
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| maxServerMeta | 5 | Maximum number of metadata items |
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| | | associated with a server. |
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+-------------------+-------------------+------------------------------------+
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| maxImageMeta | 5 | Maximum number of metadata items |
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| | | associated with an image. |
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+-------------------+-------------------+------------------------------------+
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| maxPersonality | 5 | The maximum number of file |
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| | | path/content pairs that can be |
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| | | supplied on server build. |
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+-------------------+-------------------+------------------------------------+
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| maxPersonalitySize| 10240 | The maximum size, in bytes, for |
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| | | each personality file. |
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+-------------------+-------------------+------------------------------------+
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Determine limits programmatically
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Applications can programmatically determine current account limits. For
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information, see
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`*Limits* <http://developer.openstack.org/api-ref-compute-v2.html#compute_limits>`__.
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