Merge "Re-propose Unified Limits in Nova"
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This work is licensed under a Creative Commons Attribution 3.0 Unported
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License.
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http://creativecommons.org/licenses/by/3.0/legalcode
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==================================
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Unified Limits Integration in Nova
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==================================
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https://blueprints.launchpad.net/nova/+spec/unified-limits-nova
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The spec is about adopting Keystone's unified-limits.
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Includes using oslo.limit to enforce the Nova related limits set in Keystone.
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This spec proposes having unified limits in parallel with the existing
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quota system for at least one cycle, to allow for operators to transition
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from setting quotas via Nova to setting limits relating to the Nova API
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endpoint via Keystone.
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All per user quota support is dropped, in favor of hierarchical
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enforcement that will be supported by unified limits.
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Only server count limits and limits on Resource Class resources requested in
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the flavor will be supported with unified limits. All other existing quotas
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will no longer support per project or per user limits.
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Given this placement focused approach, we will depend on the work done here:
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http://specs.openstack.org/openstack/nova-specs/specs/train/approved/count-quota-usage-from-placement.html
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Problem description
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===================
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While much work has been done to simplify how quotas are implemented in
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Nova, there are still some major usability issues for operators with
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the current system:
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* We don't have consistent support for limit/quota hierarchy across OpenStack
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* Requiring operators to set limits individually in each service
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(i.e. Cinder, Nova, Neutron, etc)
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* Nova's existing quotas don't work well with Ironic
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* No support for custom Resource Class quotas (includes "per flavor" quotas)
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* Confusion when API defined quota limits override any changes made to the
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configuration
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* Some Nova quotas are unrelated to resource consumption, causing confusion
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Transitioning to use Keystone's unified limits, via oslo.limit, will help fix
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these issues.
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For more details on unified limits in keystone see:
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https://docs.openstack.org/keystone/stein/admin/identity-unified-limits.html
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Use Cases
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---------
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The key use cases driving this work are:
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* API User tries to understand why they got an Over Quota error
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* Operator migrates to unified limits from existing limits
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* Operator sets a default limit for a given endpoint via Keystone. Note there
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can be different limits for each Region, even with a shared Keystone.
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* Operator sets specific limits for a given project via Keystone
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* Operator defines limits of a set of projects via non-flat enforcement
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i.e. the feature formally known as hierarchical quotas
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We will focus on adding unified limits relating to:
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* total number of servers
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* amounts of each Resource Class requested in the flavor
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Note, this includes things like DISK_GB which is not supported today,
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along with things like custom resource class resources that are requested
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in extra specs (e.g. Ironic flavors).
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We will now look at all quotas exposed via the API and what they map to
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when using unifed limits:
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https://docs.openstack.org/api-ref/compute/?expanded=show-a-quota-detail#show-a-quota
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The follow existing quota types move to unified limits, allowing for
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per endpoint defaults and per project overrides (and hierarchical limits)
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via the unified limits system:
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* ``cores`` -> ``resource:VCPU``
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* ``instances`` -> ``server_count``
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* ``ram`` -> ``resource:MEMORY_MB``
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The following existing quota becomes defined only by a configuration
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option, and we no longer support and per project or user overrides
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via the API, we just report the existing limit as defined in the
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configuration:
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* ``key_pairs`` (counted per user)
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* ``server_groups`` (counted per project)
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* ``server_group_members`` (counted per server group)
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* ``metadata_items`` (counted per server)
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The above are purely protecting database bloat (i.e to stop a denial
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of service attack that fills up the database). They are similar to the
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hardcoded limit of the number of tags you can attach to a server.
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While deprecated in the API, we will also treat these quotas in the
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same way as the quotas above, i.e. they will now be set via
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confirguration with no per project overrides possible:
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* ``injected_file_content_bytes``
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* ``injected_file_path_bytes``
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* ``injected_files``
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Proposed change
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===============
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There are several parts to this spec:
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* Enforce Unified Limits
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* No per-user limits
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* No uncountable limits
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* Deprecate Nova's Quota APIs
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* Operator tooling to assist with the migration
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Enforcing Unified Limits
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------------------------
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We will support the following limits:
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* ``server_count``
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* ``resource:<RESOURCE_CLASS>``
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All the resource class usage will be counted using placement, but
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server count will make use of instance mappings. This only works if the
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queued for delete data migration has been completed. Due to no user
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based quotas, we don't need the ``user_id`` migration. If the operators
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tries to use unified limits before completing the migration, the code
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will block all new usage until the migration is completed. It is
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expected a blocking migration will be added before we turn on unified
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limits by default. For more details on the this data migration see
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this point in the existing quota code:
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https://github.com/openstack/nova/blob/0d3aeb0287a0619695c9b9e17c2dec49099876a5/nova/quota.py#L1053
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To allow the new system to co-exist with the older quota system, we add
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the following configuration to allow operators to opt-into the new system
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when the operator has migrated to unified limits, and the default will be
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to use the older quota system:
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* ``quota.enforce_unified_limits = False``
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For further details on the transition, please see the update section of this
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specification. Note the new unified limits code will have a hard dependency
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on counting usage via placement; as such it will ignore the value of
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``CONF.quota.count_usage_from_placement``.
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Looking at the existing quotas, `instances` becomes `server_count`,
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`cores` becomes `resource:VCPU` and `ram` becomes `resource:MEMORY_MB`.
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This work will re-use a lot of the new logic to query placement for resource
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usage, and use the instance mapping table to count servers added in this spec:
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http://specs.openstack.org/openstack/nova-specs/specs/train/approved/count-quota-usage-from-placement.html
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To find out what resources a server will claim, we reuse this
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code to extract the resources from any given flavor:
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https://github.com/openstack/nova/blob/2e85453879533af0b4d0e1178797d26f026a9423/nova/scheduler/utils.py#L387
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For server build, we use the above function to get the Resource Class
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resource amounts for the requested flavor. This will then be checked using
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olso.limit, which ensures the additional usage will not push the associated
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project over any of its limits. The oslo.limit library is responsible for
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counting all the current resource usage using a callback we provide that makes
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use of placement to count the current resource usage.
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Once resources are claimed in placement, we optionally recheck the limits
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to see if we were racing with other server builds to consume the last bits
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of available quota. The only change is using oslo.limit to do the recheck.
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That is, we will still respect the config: `quota.recheck_quota`
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Note: we do the first check of limits in nova-api, and the recheck in
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nova-conductor after resource allocation in placement succeeds.
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It is a similar story with resize. Except in this case, we check that we can
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claim resources for both the new flavor and old flavor at the same time.
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Note that this is quite different to the current quota system, even when
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counting usage via placement.
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For further details on the semantic changes relating to counting with
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placement see:
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http://specs.openstack.org/openstack/nova-specs/specs/train/approved/count-quota-usage-from-placement.html
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Note baremetal instances no longer claim any VCPU or MEMORY_MB resources.
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With this method, baremetal instances can be limited using custom
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resource class resources they request in the flavor.
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Should we choose to allow additional custom inventory entries
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from hypervisor based compute nodes, such as `{'CUSTOM_GPU_V100':1}`
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we will be also be able to apply quotas on these resources.
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The oslo.limits library will likely add additional configuration options.
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In particular, operators will need to specify the Nova API's endpoint uuid
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to oslo.limit, so it knows what unified limits apply to each particular
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Nova API service.
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No per user limits
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------------------
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Nova currently supports "per user" limits. They will no longer be supported
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when: ``quota.enforce_unified_limits = True``
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There are no plans for migration tools, however it is expected that users
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that need a similar model can test out using the unified limits support for
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hierarchical limits, and report back on what could help others migrate.
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No uncountable limits
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---------------------
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As stated above, the focus for unified limits is the instance count and
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resource class allocations in placement. No other limits will be moved to
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unified limits, as agreed with operators in the Train Forum session.
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There are limits that are specific to nova-network. These are all ready
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deprecated. There are no plans to support these with unified limits turned on:
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* ``fixed_ips``
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* ``floating_ip``
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* ``security_group_rules``
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* ``networks``
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The remaining limits are all mainly used to protect the database from rogue
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users using up all available space in the database and/or missuse the API as
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some sort of storage system. As such, it is not expected that operators need
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per project overrides for any of these limits. As such, we propose to drop
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support for changing the limits via the API, and instead only allow changing
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of the limits via a single configuration option that applies to all
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projects in the system.
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The following limits will be changed to only be set via a single configuration
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option that applies equally to all projects:
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* ``server metadata``
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* ``injected_files``
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* ``injected_file_content_bytes``
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* ``injected_file_path_bytes``
|
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* ``key_pairs`` (counted per user)
|
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* ``server_groups`` (counted per project)
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* ``server_group_members`` (counted per server group)
|
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|
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Note that the server_group_members are currently counted per user, but this
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is frankly very confusing, so above we propose the simpler limit servers
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in the server group. This seems consistent with removing per user limits for
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all other project owned resources.
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Using a global configuration option only means:
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* no per project overrides
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* no per user overrides
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* no changing of limits via the API
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|
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These are limits on the amount of data that can be stored in various
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Nova databases. There is no way to display a project's usage of these limits,
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which further demonstrates how these are different to the resource limits
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unified limits has been designed for.
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Currently we honor ``quota.recheck_quota`` for all of these quotas. This adds
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significant code complexity, however most users never hit these limits and
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they are all very soft limits. As such, when we transition to a single global
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configuration value for all of these, we also will stop doing any rechecks.
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In summary the impact on the configuration options is:
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* ``quota.recheck_quota`` will have an updated description, noting what
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functionality is lost when ``quota.enforce_unified_limits = True``.
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* ``quota.floating_ips``, ``quota.fixed_ips``, ``quota.security_groups``,
|
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``security_group_rules``: remain deprecated, and will be ignored when
|
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``quota.enforce_unified_limits = True``.
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* ``quota.metadata_items``, ``quota.injected_files``,
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``quota.injected_file_content_bytes``, ``quota.injected_file_path_length``,
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``quota.server_groups``, ``quota.server_groups_members``,
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``quota.key_pairs``: these will all be
|
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kept, but the description will be updated to note if
|
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``quota.enforce_unified_limits = True`` all updates via the API are ignored.
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|
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Deprecate Nova's Quota APIs
|
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---------------------------
|
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|
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To query and set limits, Keystones APIs should be used. To query a user's
|
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usage, the Placement API should be used, assuming placement is happy
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changing the default policy to allow users to query their usage.
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|
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The one exception is server count can't currently be checked via
|
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Placement. When placement implements consumer records,
|
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or similar, then all usage could be queried via Placement. To avoid
|
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using a proxy API, users can do a server list API and count the number
|
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of servers returned.
|
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|
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When ``quota.enforce_unified_limits = True`` a best effort will be made to
|
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keep the older micro-versions working by proxing API calls to Keystone and
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Placement as needed. No quota related DB tables will be accessed when
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``quota.enforce_unified_limits = True``.
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This includes the follow API resources:
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* /limits
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* /os-quota-sets
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* /os-quota-class-sets
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Existing tooling to set quotas should continue to operate, as long as it only
|
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changes quotas relating to instances, cores and ram. Requests to change any
|
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other quotas will be silently ignored. As one example, this should allow
|
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Horizon to function as normal during the transition.
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|
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When you list limits for quotas that are not supported in the new system, they
|
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will instead show the configuration based limit that replaces the DB and API
|
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based limits, e.g. for keypairs you always see the config based value, no
|
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update via the API will ever be reflected back when
|
||||
``quota.enforce_unified_limits = True``
|
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|
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There are some trade-offs with this approach:
|
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|
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* Proxy APIs suck, but horizon must keep working as such all current operator
|
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tooling around these existing APIs.
|
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* We don't need a micro version to enable/disable this proxy
|
||||
of the quota APIs, as it doesn't really change the API.
|
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* In a future release when unifed limits becomes the default,
|
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we should deprecate the APIs
|
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``/os-quota-sets`` and ``/os-quota-class-sets`` and tell users to talk to
|
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the Keystone API instead. API based discovery of when Nova is enforcing
|
||||
the limits set in Keystone is left for a future spec.
|
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* It is expected the above API deprecation will follow the pattern used
|
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by nova-network proxy APIs, i.e. the APIs return 404 in new microversions
|
||||
but continue to work in older microversions. Its possible in the more
|
||||
distant future the APIs could be removed by returning 410 error.
|
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* Rejecting updates to quotas that we were previously able to set would be a
|
||||
breaking change in behaviour, and require a microversion. Adding a new API
|
||||
microversion that returns BadRequest for unsupported quotas would be a nice
|
||||
addition if we were not planning on deprecating the API in favor of calling
|
||||
Keystone instead.
|
||||
* Ideally we would also deprecate ``/limits`` in favor of a cross project
|
||||
agreed direction that is aware of both flat and hierarchical limit
|
||||
enforcement. Howerver we do not yet have consenus on what direction
|
||||
we take. For this spec, we leave ``/limits`` in its current form, even
|
||||
though it does not report on all the types of resource usage we now
|
||||
support have limits on, and even though it lists limits that can
|
||||
now only be changed via the configuration file.
|
||||
* When hierarchical limits are added, the per project usage information
|
||||
in ``/limits`` does not mention anything about parent limits.
|
||||
As such quota APIs may claim resources are available, but you will be
|
||||
unable to build any new resources.
|
||||
It is not clear what action the user can make to be able to build those new
|
||||
resources. Operators can avoid this confusion by not over allocating quota.
|
||||
We could extext the API to include a boolean to say if the limit has been
|
||||
exceeded in the parent project, and as such the user is unable to consume
|
||||
more resources even though their own usage is not over their own limits.
|
||||
We could consider extending the API to include the usage of the full tree
|
||||
|
||||
Migration to Unified Limits
|
||||
---------------------------
|
||||
|
||||
The migration of all users to unified limits is happening in three phases:
|
||||
|
||||
* enable unified limits as an option, with migration path from existing quotas
|
||||
* make unified limits the default, deprecate existing quota system
|
||||
* remove existing quota system
|
||||
|
||||
To help with the transition we need operator tooling to:
|
||||
|
||||
* Set registered limits in Keystone for each Nova endpoint in Keystone,
|
||||
based on current limits in DB and/or configuration
|
||||
* Copy per-project quotas set in Nova into Keystone unified-limits
|
||||
* Operator confirms unified limits works for them
|
||||
* Drop all quota info from the DB to signal operator has completed transition
|
||||
* Upgrade status check to check there is no data left in quota DB tables
|
||||
|
||||
Note the setting of project limits and registered limits in keystone will
|
||||
happen via files that are generated and passed to keystone-manage. This
|
||||
allows fast-forward upgrades where no API are available during the migration
|
||||
of limits from Nova to Keystone.
|
||||
|
||||
There will be a new tool to setup the registered limits in keystone. It will
|
||||
read from the Nova DB and configuration and generate a file. That file can be
|
||||
by used with keystone-manage to register the current endpoint defaults in
|
||||
keystone.::
|
||||
|
||||
nova-manage limits generate_registered_limits --endpoint <endpoint-uuid>
|
||||
|
||||
The following tool will generate the unified limits overrides (if any)
|
||||
that needs to be added into Keystone for each project. Again this too
|
||||
produces a file that is handed to keystone-manage which will update keystone::
|
||||
|
||||
nova-manage limits generate_project_limits [--project_id <project_id>]
|
||||
|
||||
Once the operator sets `quota.enforce_unified_limits = True`, the Nova DB is
|
||||
ignored, and limits are accessed from Keystone only.
|
||||
|
||||
To complete the migration, there is an operation to remove all the
|
||||
DB entries relating to the quota overrides. The tool only works when
|
||||
`quota.enforce_unified_limits = True`. It also removes all any per user limits
|
||||
associated with each project.::
|
||||
|
||||
nova-manage limits remove_db_quota_entries [--project_id project_id]
|
||||
|
||||
Note the last two tools allow operators to iterate per project, to limit the
|
||||
load on the running system. If these tools are used on a running system, it is
|
||||
recommended that operators don't change quotas via the API during the
|
||||
transition.
|
||||
|
||||
The nova status command will warn users that have failed to remove all the
|
||||
quota information from the DB. This will become an error in the release when
|
||||
``quota.enforce_unified_limits`` defaults to ``True``.
|
||||
|
||||
It is worth noting that the Nova database may contain entries for projects
|
||||
that have been deleted in keystone. As such, it is advisable to get a list
|
||||
of active projects from keystone, and only generate_project_limits for those
|
||||
particular projects.
|
||||
|
||||
This transition leaves several configuration options redundant, in particular
|
||||
the following will all be deprecated once unified limits is on by default:
|
||||
|
||||
* ``quota.instances``, ``quota.cores``, ``quota.ram``: deprecate all these as
|
||||
the limit now comes from keystone for unified limits, which will default to
|
||||
unlimited if there is no limit in keystone.
|
||||
* ``quota.driver`` is ignored and hard coded to the no-op driver when
|
||||
``quota.enforce_unified_limits = True``.
|
||||
|
||||
The setting ``quota.recheck_quota`` will be kept, and will be used in the same
|
||||
way with unified limits to avoid races when multiple instances are built at
|
||||
the same time.
|
||||
|
||||
Alternatives
|
||||
------------
|
||||
|
||||
Ideally we would not add any more proxy APIs, however, operators pushed back
|
||||
at the Train Forum session, requesting that their tooling continue to work
|
||||
across the transition. No operators reported using limits other than the
|
||||
instances, cores and ram limits.
|
||||
|
||||
We could implement hierarchical quotas in isolation, and not adopt unified
|
||||
limits.
|
||||
|
||||
We could limit the types of resources we limit, but it will be hard to
|
||||
transition to supporting different kinds of resource limits in a clear
|
||||
and interoperable way.
|
||||
|
||||
Data model impact
|
||||
-----------------
|
||||
|
||||
See upgrades, no changes in Victora due to having old and new quota systems
|
||||
side by side. Once we remove the old quota system, we could drop all the
|
||||
quota related DB tables.
|
||||
|
||||
REST API impact
|
||||
---------------
|
||||
|
||||
When ``quota.enforce_unified_limits = True`` Nova will proxy the requests
|
||||
to Keystone's unified limits API, where possible. The aim will be to keep
|
||||
horizon functioning correctly during the transition.
|
||||
|
||||
Once using unified limits, operators should move to using Keystone's
|
||||
unified limit APIs to set and query limits. Usage information should be
|
||||
queried via Placement and the Servers API.
|
||||
|
||||
Security impact
|
||||
---------------
|
||||
|
||||
The removal of quota rechecks for some limits slightly reduces the protection
|
||||
provided, but really it encourages the proper implementation of API
|
||||
rate limiting as replacement protection.
|
||||
|
||||
Notifications impact
|
||||
--------------------
|
||||
|
||||
None
|
||||
|
||||
Other end user impact
|
||||
---------------------
|
||||
|
||||
Quota errors should appear the same before and after this change.
|
||||
|
||||
Performance Impact
|
||||
------------------
|
||||
|
||||
It is possible to have more complicated quota counts with hierarchical
|
||||
quotas, but the implementation of that is delegated to oslo.limit.
|
||||
|
||||
Other deployer impact
|
||||
---------------------
|
||||
|
||||
There are several tools to help ease the transition to unified limits noted
|
||||
above. Although it is expected that use of the feature will help inform the
|
||||
end direction.
|
||||
|
||||
Developer impact
|
||||
----------------
|
||||
|
||||
There will now be two limit system to maintain for a few cycles during the
|
||||
transition. But this avoids the long term need to maintain complicated
|
||||
hierarchical limit code, which still getting the advantages, such as being able
|
||||
to tidy up API policy.
|
||||
|
||||
Upgrade impact
|
||||
--------------
|
||||
|
||||
To get the best experience, operators need to start using the unified limits
|
||||
API via Keystone. User should start querying usage from Placement.
|
||||
|
||||
The transition between the existing quota system and unified limits is
|
||||
detailed in the proposed solution section.
|
||||
|
||||
It is expected that oslo.limit will limit versions of Keystone that can be
|
||||
used to Queens and newer, which is not expected to affect most users.
|
||||
|
||||
Implementation
|
||||
==============
|
||||
|
||||
Assignee(s)
|
||||
-----------
|
||||
|
||||
Primary assignee:
|
||||
johnthetubaguy
|
||||
|
||||
Other contributors:
|
||||
(TBC)
|
||||
|
||||
Feature Liaison
|
||||
---------------
|
||||
|
||||
Feature liaison:
|
||||
melwitt
|
||||
|
||||
Work Items
|
||||
----------
|
||||
|
||||
* Add calls to oslo_limits, guarded by config to enable it
|
||||
* Move quota APIs to proxy to Keystone when unified limit quotas enabled
|
||||
* Add tools to migrate default and tenant limits from Nova into Keystone
|
||||
* Upgrade checks to ensure above tooling is used
|
||||
|
||||
Dependencies
|
||||
============
|
||||
|
||||
* http://specs.openstack.org/openstack/nova-specs/specs/train/approved/count-quota-usage-from-placement.html
|
||||
* keystone manage commands to add limits when keystone API not available
|
||||
|
||||
Testing
|
||||
=======
|
||||
|
||||
Grenade test that runs the migration of quota settings (after adding some
|
||||
quotas).
|
||||
|
||||
Functional tests to ensure quotas are enforced based on unified limits
|
||||
correctly.
|
||||
|
||||
Documentation Impact
|
||||
====================
|
||||
|
||||
Building on the work to document quota usage from placement, we should
|
||||
describe how the new system operates. The admin guide needs to detail
|
||||
how to smoothly migrate to unified limits.
|
||||
|
||||
References
|
||||
==========
|
||||
|
||||
None
|
||||
|
||||
History
|
||||
=======
|
||||
|
||||
.. list-table:: Revisions
|
||||
:header-rows: 1
|
||||
|
||||
* - Release Name
|
||||
- Description
|
||||
* - Victora
|
||||
- Introduced
|
||||
Loading…
Reference in New Issue