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[nova] Patch for Calico with libvirt >= 9.5.0
by Nell Jerram 04 Nov '25

04 Nov '25

I apologise if this is the wrong place to ask, but is there something I can do to encourage review and approval for https://review.opendev.org/c/openstack/nova/+/960284 ? Many thanks - Nell

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[manila] Cancelling Nov 6th weekly meeting
by Carlos Silva 04 Nov '25

04 Nov '25

Hello Zorillas and interested stackers, As discussed in the previous upstream weekly meeting, we're cancelling this week's meeting, so we have some extra time to go through PTG action items before we regroup. The next meeting will be on Nov 13th. Thank you, carloss

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[kolla-ansible] Migration from OVS to OVN
by Winicius Allan 04 Nov '25

04 Nov '25

Hi kolla o/ I was searching to see if Kolla currently supports migration from OVS to OVN, and I've found this email thread [1]. I'd like to know if this feature has been implemented, and if so, what the necessary steps are. [1] https://lists.openstack.org/pipermail/openstack-discuss/2023-March/032785.h… Best regards

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Kolla-Ansible deployment results in broken dashboard
by Ricardo Matheus 04 Nov '25

04 Nov '25

Hi all I just deployed a multinode OpenStack using Kolla-Ansible, but it seems that the Horizon image (ubuntu / master) is somewhat broken. Horizon runs and the dashboard is accessible, but every file in the "static" part of the web server is not available (no logo images, no css, nothing... just plain unformatted html). Is this a known bug? (btw, there was a guy asking about the same problem in irc a few days ago, it is in the logs for 2025-10-23 (Thursday) <https://meetings.opendev.org/irclogs/%23openstack/%23openstack.2025-10-23.l…> ) Cheers! RDM

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[ptg] #eventlet-removal 2026.1 Gazpacho PTG summary
by Herve Beraud 04 Nov '25

04 Nov '25

Hi everyone, Following our last week PTG meeting, I’d like to share a brief summary of the key outcomes, achievements, and next steps we agreed upon for the Eventlet removal initiative. ## Flamingo Retrospective We have crossed an important milestone: over 50% of impacted projects have shown significant migration progress. 19 deliverables are fully migrated, while 32 others are currently undergoing migration work. Here are the main accomplishments delivered during Flamingo: - Eventlet now includes support for Python 3.14, ensuring compatibility with upcoming Python releases; - Oslo.service introduced a new threading backend to provide a fully threading-based execution model; - Ironic, Heat, Barbican, Mistral, and several other projects are now fully migrated; - the Neutron migration is just one step away from completion; - Nova-api, nova-metadata-api, nova-conductor nova-scheduler can now run in threading mode. ## Gazpacho Call to Actions The following actions are expected to structure our efforts for the Gazpacho development cycle: - we must enhance oslo.service to prevent fork-inherited lock deadlocks by defaulting to the spawn multiprocessing start method, which will address known Manila and Cinder bugs; WIP https://review.opendev.org/c/openstack/oslo.service/+/963742 - we are preparing to merge the new opt-in H905 hacking rule to ensure consistent Eventlet usage detection across all OpenStack projects (see: https://review.opendev.org/c/openstack/hacking/+/959699) - we should clean up the bug tracker of migrated projects to reflect the current status of the eventlet removal efforts. Many of those projects surely have historical eventlet bugs that could be closed; - we need to maintain momentum on ongoing migrations and accelerate progress on the most delayed projects; - we should prioritize the “low-hanging-fruit” migrations, such as Cyborg and Magnum. ## Project Needing Attention Several projects have not shown any notable update during this cycle and require focus in the next series. These projects still contain Eventlet occurrences that must be addressed urgently: Blazar, Venus, Tacker, Masakari, and Zun. The TC has marked Venus and Vitrage as inactive, and these teams may be retired in 2026.2 if activity does not resume. ## Open Discussion Nova plans to focus on nova-compute, nova-novncproxy, testing improvements, and Rally-based benchmarking to fine-tune thread pool defaults, making Gazpacho the likely cycle where Nova fully switches from Eventlet to threading. Dan Smith presented a strategy idea for Glance that we could name the “Optional Eventlet Shim Strategy.” The goal of this approach is to make the use of Eventlet fully optional, allowing Glance to run without this dependency by default. To achieve this, all Eventlet-related code would be isolated outside of Glance’s core and moved into a separate module acting as a bridge. The core of Glance would remain unique and free of any references to Eventlet. If users still wish to rely on Eventlet, they would be able to install an additional module that provides the required implementation. Without this module, Glance would naturally run using the native threads concurrency mode. This approach offers a smooth transition path while preserving the ability to revert if needed, ultimately moving Glance toward a fully Eventlet-free architecture. Thank you to everyone who contributed during the PTG discussions and for the continuous efforts across teams. Let’s keep the momentum going as we enter the Gazpacho cycle and move closer to a fully Eventlet-free OpenStack. As always, you’re welcome to join us on IRC at #openstack-eventlet-removal, and you can find guidance, resources, and updates at https://removal.eventlet.org/ Thanks for your attention. -- Hervé Beraud Principal Software Engineer at Red Hat irc: hberaud https://github.com/4383/

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[watcher] 2026.1 Gazpacho PTG summary
by Douglas Viroel 04 Nov '25

04 Nov '25

Hi all, Last week's PTG had a lot of great discussions, covering many different aspects of the Watcher project. If you want to get mode details about a topic, you can find the PTG etherpad with all notes here https://etherpad.opendev.org/p/watcher-2026.1-ptg Here is a summary of the discussions that we had: Future of datasources backends and untested integrations *Discussion*: The discussion revolved around the removal timeline for Monasca, the status of Gnocchi, and the deprecation of Prometheus datasource in favor of Aetos. There was also a proposal to deprecate MAAS support due to lack of testing and documentation, and to re-evaluate experimental integrations in 2026.2. *Agreed*: - AI(jgilaber): Monasca datasource will be removed this cycle. - More research is needed on current Gnocchi usage, and there will be no change in its support this cycle. Suggestion: include a question about gnocchi in the next openstack user survey. - AI(jgilaber): Prometheus will be deprecated in 2026.1 in favor of Aetos. Suggestion: include documentation on how to upgrade between datasources. - AI(dviroel): MAAS will be marked as deprecated this cycle, since it has Eventlet dependent code that is planned to be removed in a near future. We will send another email to the ML to call for maintainers. - AI(sean-k-mooney): Update Watcher documentation about service integrations that are now deprecated. Openstack SDK *Discussion*: It was focused on integrating Watcher with the OpenStack SDK to deprecate and remove the python-bindings in other places. The goal for watcher is to replace the current usage of the project's client with the SDK instead (if there is support for it). The goal for python-watcherclient is to only provide the *openstackclient* plugin and replace python binding by adopting the usage of the SDK (when available). And for the watcher-dashboard is to use the SDK exclusively for API interactions (also when available). *Agreed*: - Start with watcher integrations. The goal is to move one service client (e.g.: Nova) to the SDK this cycle. - Do not freeze python bindings until SDK support is in place. - A single spec can address the overall plan. Code modernization, dependencies and dead code removal *Discussion*: The discussion covered code modernization using pyupdate and potentially ruff for cleanup. It also addressed the removal of dead code, such as API routes that always raised exceptions and commented-out code in production files. The removal of various client dependencies (Neutron, Glance, Monasca) was also proposed. *Agreed*: - Apply the same pre-commit and ruff linting checks to the tempest plugin and watcher client. - Defer decisions on more typing until necessary, possibly starting with interfaces. - Explore dropping the number of dependencies, such as multiple timezone libraries. Applier's Workflow Execution and Its Interface/Contract *Discussion*: The workflow for the Applier was identified as poorly documented, leading to questions during reviews of new actions. The need for a default Action interface was discussed. *Agreed*: - The assessment of a default Action interface will be based on the chosen path for rollback and aborting topics. - AI(dviroel): Current interface needs to be documented regardless. Applier: Aborting running tasks *Discussion*: The current implementation of the Applier spawning a new green thread for each action, and killing threads for actions that support abort(), was discussed. *Agreed*: - Stop spawning/killing threads on every action. This code can be refactored right after we merge the eventlet changes in the applier (so we don't mix the proposals). - Improve the execute() method in actions to check resource status and abort the process/looping when an action is cancelled/aborted. Applier: Rollback of Action Plans *Discussion*: The current lack of a working rollback mechanism and the fact that the revert() method from Actions is not being tested or called were highlighted. The future of the rollback option was debated. New rollback mechanisms, such as a user-triggered "rollback" action for failed action plans, were also considered. *Agreed*: - Auto-revert does not work and should be removed in the future. - AI(dviroel): Current behavior should be treated as a bug, and the documentation and associated configuration options should be updated accordingly. - A new spec should be proposed for a new action plan to revert workflow. CI Testing and Coverage *Discussion*: The naming and refactoring of watcher CI jobs were discussed. The need for every voting job in check to also run in the gate was emphasized, as well as in stable branches and other watcher projects. Job renames and consolidation were proposed, along with enabling tempest scenario jobs for stable branches and creating a new grenade job for upgrade testing. *Agreed*: - AI(dviroel): Job renames/consolidation: watcher-functional can be merged into other tempest jobs, watcher-tempest-actuator can be merged into strategies job, and ipv6 job should be integrated into other existing tempest jobs. Gate updates will occur after renaming and merging jobs. Backporting changes from master to stable branches is expected. - AI(dviroel): In watcher-tempest-plugin: replace tempest-functional with a tempest job that runs scenario tests for stable branch validation. - AI(chandankumar): A new grenade job to test upgrades between slurp releases and include more testing in existing jobs. - AI(sean-k-mooney): Propose a watcher job to run against OpenStack requirements project. Improving testing coverage for strategies by doing functional testing *Discussion*: A specification proposal and a detailed implementation plan for improving testing coverage for strategies through functional testing were presented. *Agreed*: - A phased approach will be taken: - AI(amoralej): 1st phase: API only GETs/POSTs. - 2nd phase: Adding decision-engine + Nova + Prometheus datastore. - 3rd phase: Adding Applier. Rally Testing in watcher *Discussion*: The current status of Rally testing in Watcher was reviewed, noting that the rally-task-watcher job runs but is not in the Watcher repository. Missing functionalities were identified, such as the inability to pass audit template scope and parameters, lack of auto-triggering, and no support for event, continuous audit, action plans, and actions. *Agreed*: - AI(chandankumar): Move rally-openstack watcher plugin code to watcher repo - AI(chandankumar): Add periodic job to run rally jobs - Revisit this topic in future as we progress on scaling watcher CI Watcher-dashboard improvements *Discussion*: Improvements to the Watcher dashboard were discussed, including adding auto-page refresh for audit/action plan status, a start button for action plan details, and options for bulk archiving. Dashboard testing using the Django test framework and Playwright was also covered. *Agreed*: - Create wishlist bugs or blueprints to track dashboard improvements. - AI(chandankumar): Check with TC regarding the usage of pytest to improve wording and proceed with integration tests implementation - AI(reviewers): Get the spec https://review.opendev.org/c/openstack/watcher-specs/+/963438 merged. - A spec will be required for the audit and action plan bulk archive feature. The future of datamodel list API *Discussion*: The utility of the datamodel list API, beyond tempest tests, was questioned. The possibility of freezing the API with existing content to avoid microversion bumps for new instance/node updates was raised. The addition of new storage models (storage and baremetal) was also discussed. *Agreed*: - Do NOT extend the API to support additional models. - Defer the removal of datamodel list (compute model) to future discussions, but for now, do not extend it further, even if new fields are added to model elements. - AI(dviroel): Add test to avoid new API changes in datamodel list. Eventlet Removal *Discussion*: Changes made in the Flamingo cycle regarding Eventlet removal were reviewed.The need for a collector sync timeout for threading mode and refactoring the action plan cancel workflow were discussed. *Agreed*: - AI(dviroel): Collector timeout topic: REST API calls should continue to have their own timeouts, and an event trigger can assist in stopping the overall sync process. Add a new config option for collector timeout should be considered. - Applier: stop killing threads when an action plan is canceled. We can keep the current behavior for evenlet but it will be a noop for threading mode (minimal impact for eventlet removal changes). - AI(dviroel): Set MAAS to deprecate after PTG. We will send an email to the ML to call for maintainers once again. (same AI in Future of datasources topic) Future of Noisy Neighbort Goal/Strategy *Discussion*: The deprecation of cache monitoring metrics in the kernel and Nova, which formed the basis of the current noisy neighbor strategy, was discussed. The need to replace this strategy and identify new metrics for contention (e.g., CPU steal, CPU pressure, IOWait) and noisy neighbors (e.g., CPU usage from low-priority instances) was explored. Instance priority mechanisms were also considered. *Agreed*: - Remove the current noisy neighbor strategy in 2026.2+ to allow deprecation to ship in a Slurp release. - AI(dviroel): a proof of concept for CPU steal/IOWait/other metrics is a nice to have, to replace current LLC monitoring metrics. - Use instance metadata for PoC, but consider different solutions for identifying/classifying workloads priorities, like tiering based on flavor extra spec information. Scaling Watcher *Discussion*: The limitations of running a single instance of the Decision Engine and Applier were discussed, with ideas for horizontal scalability. Scalability concerns were raised for different watcher resources: audits, actions and action plans. Some of the open issues that were discussed: - Centralized datamodel: it is independently managed by each decision-engine. Move the model from in-memory to memcached or the database was discussed. - ONESHOT audits are not a failover in a multiple-decision engine deployment. - When an applier dies, the action plan remains ONGOING and is only cancelled upon the applier restart. The main issue was identified as continuous audits being associated with a specific decision-engine. The concept of moving to an event-driven model with stateless decision engines and appliers was proposed, where data models would reside in the database or a shared data store. *Agreed*: - Fow now, instrument the decision-engine to measure the size of the model, and time taken to process notifications. - Keep current failover behavior for ONESHOT audits. - We could have a service monitor in the applier to reschedule PENDING action plans and cancel ONGOING ones, providing the proper status message. - There should be a way limit and set concurrency of actions in audits. In this cycle we will propose a mechanism setting them at system or audit level that covers all the strategies. Stacking Strategies *Discussion*: The possibility of having stacking strategies was brainstormed in this topic. This included ideas like sequential execution of multiple strategies, where a mutable cluster data model would be shared among them. This could result in a list of linked action plans, or result in merging all actions into a single action plan to avoid unnecessary steps. This discussion may be revisited soon, with a more detailed use case. *Agreed*: - Get back to this topic when we have more detailed use cases. Propose a spec to highlight the need of this feature in watcher. Please let me know if I missed something. Thanks! Assisted-By: Gemini -- Douglas Viroel - dviroel

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[kolla][OpenStackAnsible] 2025.2 Flamingo release for cycle-trailing projects
by Thierry Carrez 04 Nov '25

04 Nov '25

Hi teams, This is a gentle reminder that the following projects with cycle-trailing release model haven't done their final 2025.2 Flamingo release yet: [kolla] ansible-collection-kolla kayobe kolla-ansible kolla [OpenStackAnsible] openstack-ansible-roles openstack-ansible Note that next week we'll ask for cutting stable/2025.2 branches, as kind of a Feature Freeze, 3 weeks prior the 2025.2 Flamingo Cycle-Trailing Release Deadline on December 4th, 2025 [1] (exactly one month away). [1] https://releases.openstack.org/gazpacho/schedule.html#g-cycle-trail Thanks in advance, -- Thierry Carrez (ttx)

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[nova][ptg] 2026.1 Gazpacho PTG summary
by Rene Ribaud 04 Nov '25

04 Nov '25

Hello everyone, Last week was the PTG, thank you to all who joined and contributed to the discussions! I hope you enjoyed it and found it productive. Again, this cycle we had a packed agenda with active participation throughout the sessions. For the Nova sessions (Tuesday to Friday), we had an average of 15 to 20 participants per session. Attendance was slightly higher during the cross-project discussions, with an average of 25 to 30 people joining. You can revisit all notes and discussions on the Etherpad here: https://etherpad.opendev.org/p/r.9bac75a686ab0941572757b205c9415c Below is a summary of the topics and outcomes from our PTG discussions. I’ve tried to keep it as concise as possible, though we covered quite a lot during the week. **** Tuesday topics **** #### 2025.2 Flamingo Retrospective #### During the Flamingo cycle, 14 blueprints were accepted and 9 were fully implemented, resulting in a 64% completion rate. This is slightly lower than the 71% achieved during the previous Epoxy cycle. In addition, at least 26 bug fixes were merged during the cycle. Review & Process Feedback Eventlet Transition Plan, the migration continues to work as expected and remains well-coordinated. Release process was smooth with no major issues reported. Recognition to Kamil for his work on the conductor, and to Sean, Dan, and others for their consistent review efforts. ✅ Continue to prioritize the Eventlet removal as a key goal for the G cycle. Branch Opening Policy, some uncertainty remains about what can be merged between RC1 and GA, when master is technically open but still sensitive for late merges. Concerns were raised about backports and release stability. ✅ Allow merges on a case-by-case basis once the new master branch opens. ✅ Bauzas to propose a patch updating Nova contributor process <https://docs.openstack.org/nova/latest/contributor/process.html> <https://docs.openstack.org/nova/latest/contributor/process.html> Bug Triage, the number of untriaged bugs remains high (around 180). Efforts were noted, but time allocation and rotation remain challenging. The end-of-meeting triage format was found ineffective for real-time work, though still useful for discussing specific cases. ✅ Consider reviving a rotating triage roster if enough volunteers join. ✅ Keep triage discussions focused during the weekly meeting rather than doing live triage. Review Load, contributors noted increasing difficulty in finding time for reviews. Maintaining review velocity remains a cross-cycle challenge. ✅ Encourage feature-specific syncs or review sprints for high-priority areas. Feature Momentum, weekly syncs and structured updates help large features maintain progress. The VMware CI topic was cited as useful, though too many topics per meeting could cause overload. ✅ Keep dedicated weekly or bi-weekly syncs for major features (e.g. Eventlet removal). ✅ Limit meeting updates to 2-3 features per session. Review Tracking, the previous Etherpad tracker was not effective. However, having a central list remains important to avoid missing patches and to monitor review health. ✅ Discuss an external or simplified review tracker during the next meeting with more core reviewers. ✅ Keep the tracker short and up to date to maintain visibility. #### 2025.2 Flamingo Planning #### Hard spec freeze: December 4th Milestone 2 (M2): January 8th Feature Freeze (FF): February 26th Release: End of March / early April. The team discussed adjusting the timing of the spec freeze. A soft spec freeze was proposed for November 20th, giving three weeks after the PTG for contributors to submit specs. Two spec review days will be scheduled between the soft and hard freezes. Additionally, two implementation review days are planned: one around M2 for early landings, and another roughly two weeks before M3. ✅ Adopt the proposed plan, while staying flexible on a case-by-case basis. ✅ Soft spec freeze on Nov 20th, followed by two spec review days before Dec 4th. ✅ Two implementation review days: one near M2 and one two weeks before M3. ✅ A +2 on a spec implies reviewers commit to reviewing the corresponding implementation. #### Upstream meeting schedule #### ✅ Move the weekly upstream meeting to Monday at 16:00 UTC. ✅ Keep the slot fixed (no alternating or skipping weeks). ✅ Uggla to update the meeting schedule and cycle accordingly. #### Upstream bug triage follow up #### The team discussed how to better organize bug triage follow-up for the Gazpacho cycle. A proposal was made to create a small group of volunteers who would receive a few bugs to triage each week. Each volunteer would handle up to three bugs, distributed by Uggla. During the weekly upstream meeting, the team will check whether a dedicated Q&A session is needed to discuss specific bugs. If required, such a session will be scheduled every two weeks, ideally right after the upstream meeting. Otherwise, discussions will take place within the regular meeting. ✅ The team agreed to give this approach a try in the next cycle. The overall sentiment seemed favorable, though details will likely need adjustment as we go. #### Eventlet removal #### Significant progress was made since Flamingo. In Flamingo, n-api, n-metadata, and n-sch could already be switched to native threading via an environment variable, and the nova-next job runs those services without Eventlet. n-cond was nearly ready but missed feature freeze due to a late futurist bug, which has since been fixed and released. A py312-threading tox target and a Zuul job already validate a large part of the unit tests without Eventlet. In early Gazpacho, native threading for the conductor has successfully landed. Planned tasks for Gazpacho - Add native threading support for n-novncproxy and other proxies. - Add native threading support for n-compute. - Run all unit and functional tests in both threading and Eventlet modes, keeping small exclude lists where needed. - Conduct scale testing using the fake driver, possibly extended to the libvirt driver. - Switch n-api, n-metadata, and n-sch to native threading by default, keeping Eventlet as fallback. - Introduce a nova-eventlet (legacy) CI job to ensure backward compatibility. - Keep nova-next as the only job testing conductor, novncproxy, and compute with threading until the H cycle. - Fix bugs reported after Eventlet removal. - After Eventlet removal, migrate from PyMySQL to libmysqlclient for better DB performance. ✅ Kamil volunteered to handle the novncproxy migration. ✅ Start with nova-compute migration first to build confidence. ✅ Switch the default to threading as early as possible in Gazpacho. ✅ Add a dedicated Eventlet CI job to continue testing legacy mode. ✅ Use the hybrid plug job to test Eventlet mode even for services switched to threading by default. ✅ Keep the work independent, but document the known issue with long-running RPC calls. #### Long-Running Sync REST API Calls #### The team discussed how long-running synchronous REST API actions (like volume or interface attach) can block nova-api threads once Eventlet is removed. With native threading, the limited number of threads makes blocking calls more costly, unlike Eventlet which could spawn many lightweight greenlets. This work is closely related but independent from the Eventlet removal effort. Dan started a spec on the topic, and it may be split into two (volume and interface attach). Detach operations are already async, and Manila shares follow a similar model. ✅ Introduce a new microversion to keep backward compatibility. ✅ Convert volume and interface attach to async operations under that microversion. ✅ Coordinate with Rajesh’s "show finish_time" ( https://review.opendev.org/q/topic:%22bp/show-instance-action-finish-time%22 ) work to avoid race conditions. ✅ Dan and Johannes to update the spec. ✅ Further investigation is needed to determine if WSGI or API tuning could help mitigate blocking. #### vTPM Live Migration #### The team reviewed how to handle TPM secret security policies during instance operations. Changing the assigned policy during resize is not supported, as it adds complexity and can lead to image/flavor conflicts. Rebuilds are already blocked for vTPM instances, so once a policy is set via resize, it remains locked in. Existing instances from previous releases are unaffected. ✅ Do not allow changing the TPM secret security policy after assignment. ✅ Remove the option to select the policy from the image for simplicity. ✅ Default policy is “user”, but compute nodes support all policies by default. ✅ Document in the spec and release notes that deployers must define flavors with hw:tpm_secret_security if they want to enable this. ✅ Mention that [libvirt]supported_tpm_secret_security = ['user', 'host', 'deployment'] can be adjusted by operators. **** Wednesday topics **** #### CPU Comparison During Live Migration #### The team revisited the CPU compatibility check between source and destination hosts during live migration. If skip_cpu_compare_on_dest is enabled, some migrations may fail due to missing pre-checks; if disabled, the check can sometimes be too strict. The original goal is to avoid migrations to nodes running with QEMU emulation, which would cause serious performance issues. ✅ Include getDomainCapabilities in the Nova pre-check to improve accuracy. ✅ Move the configuration flag from workaround to the libvirt section. ✅ Document potential unsafe edge cases so deployers can choose between the safer (Nova) or more permissive (libvirt-only) approach. ### Start cross session with Cinder ### #### NFS / NetApp NFS Online Volume Extend #### The team discussed adding online volume extend support for NFS and NetApp backends. Instance operations (like shutdown or migration) should be blocked during the extend process, and any new task_state must stay compatible with existing microversions. ✅ Avoid using the event API, as it’s meant for fast operations. ✅ Introduce a dedicated API for this feature to manage versioning and states. ✅ Consider making the Cinder call synchronous for better control. ✅ Konrad will update the spec in this way. #### Hard-Coded io=native Setting for Cinder Backends #### The team revisited the hard-coded io=native driver setting used for Cinder volume backends (NFS, FC, and iSCSI). This code dates back nearly ten years and has recently caused performance issues and guest hangs in some environments. The original reason for enforcing io=native is unclear. ✅ No one seems to know the reason for this original choice ✅ Move the configuration to a standard libvirt configuration option. ### End cross session with Cinder ### #### Preserve NVRAM After Reboots and Migrations #### The team discussed the proposal to preserve NVRAM data across instance reboots and migrations. The feature is ready for review, pending available reviewer bandwidth. ✅ Request a definitive answer from libvirt regarding file permission handling through a bug report. ### Start cross session with Ironic/Cinder ### A more complete summary of this joint session will be provided by the Ironic team, as they can better capture the discussions and decisions made. However, the Nova PTG notes still include a few relevant takeaways and references for those interested. ### End cross session with Ironic/Cinder ### ### Start cross session with Manila ### The teams discussed testing and integration plans between Nova and Manila. Testing through Tempest was considered challenging due to configuration complexity and potential circular dependencies. Support for CephFS and NFS, hot attach, and live migration with newer OS versions was identified as a goal. ✅ Manila will draft initial UX and workflow details to share with Nova for review. ✅ Add a backlog spec in the Nova repository to track cross-team work. ✅ Manila contributors may help with open SDK and client patches as needed. ✅ Hot attach and live migration support are valuable goals but will need explicit demand and prioritization to move forward. ### End cross session with Manila ### ### Start cross session with Neutron ### A more complete summary of this joint session will be provided by the Neutron team, as they can better capture the discussions and decisions made. However, the Nova PTG notes still include a few relevant takeaways and references for those interested. ### End cross session with Neutron ### **** Thursday topics **** #### Correct Firmware Detection for Stateless Firmware and AMD SEV/SEV-ES #### The team discussed improving firmware detection for stateless firmware and AMD SEV/SEV-ES. Recent QEMU and libvirt versions now include firmware descriptor files that expose these capabilities, allowing libvirt to automatically select the right firmware without Nova duplicating that logic. The group agreed that leveraging libvirt’s detection is the better long-term approach. To avoid regressions, Nova should continue to preserve existing firmware for running instances during hard reboots, while new instances will rely on libvirt’s detection from the start. ✅ Use libvirt’s firmware detection instead of maintaining custom logic in Nova. ✅ Preserve the existing firmware for current instances on hard reboot. Let libvirt select firmware for new ones. ✅ Takashi will write a spec describing the approach and detailing the upgrade path. ✅ He will also check UEFI/stateless firmware tests in CI and run local SEV/SEV-ES tests. #### ROM-Type Firmware Support #### The team continued the discussion on firmware selection, focusing on ROM-type firmware used by AMD SEV-SNP, Intel TDX, and future Arm CCA. Since recent libvirt versions can automatically select the appropriate firmware and handle SMM when needed, Nova no longer needs to manage this logic directly. ✅ Skip further work in Nova and rely on libvirt’s firmware auto-selection mechanism. #### AMD SEV-SNP Support #### The team discussed initial plans for SEV-SNP support, which depends on firmware and requires recent QEMU (≥9.2) and libvirt versions. Work may be postponed to the 2026.2 cycle due to these dependencies. For SEV-SNP, there is a need to provide hostData, an immutable and attested field (up to 32 bytes) that can be set by Nova or external tools. Using Nova metadata for this purpose was ruled out. ✅ Do not use Nova metadata to provide SEV-SNP host data. ✅ The instance POST API could be extended to allow providing this information. ✅ Takashi will write an initial spec, keeping the design generic for both SEV-SNP and TDX. #### Generalize SEV / SEV-ES Code #### The team reviewed the proposal to generalize the existing SEV/SEV-ES code in preparation for future Confidential Computing architectures such as Intel TDX and Arm CCA. The work focuses on refactoring internal Nova code to make memory encryption handling more generic, without changing any user-visible behavior or API. ✅ Treat this as a code refactoring only (no external impact). ✅ Ensure it does not conflict with Takashi’s ongoing work. ✅ Implementation can proceed as a specless blueprint. ✅ No Tempest job available. Manual validation is acceptable, ideally with screenshots or logs. ✅ Note: It’s possible to run Tempest manually using a flavor requesting SEV/SEV-ES to verify correctness. #### Arm CCA Support #### The team discussed the roadmap for Arm CCA enablement in Nova. Upstream dependencies include Linux Kernel (Dec 2025), QEMU (Feb 2026), and libvirt (Mar 2026), with full availability expected around Ubuntu 26.04 (Apr 2026). As a result, development and testing in OpenStack are expected to start during the 2026.2 cycle. ✅ Features cannot merge until support is available in official distributions (not custom kernels). ✅ CentOS Stream 10 may serve as an early test platform if it gains CCA support before Ubuntu 26.04. ✅ Specs or PoCs can still be prepared in advance to ease future inclusion. ✅ Once libvirt support lands, the team will review the spec, targeting early in the H (2026.2) cycle. #### Show finish_time in Instance Action Details #### The proposal adds a finish_time field to the instance action show API, along with matching updates in the SDK and client. Some review comments still need to be addressed before re-proposing the patch for the G release. ✅ No objection to re-proposing the patch for Gazpacho (G). ✅ The existing spec remains valid. ✅ Gmaan will review previous comments to help move the implementation forward. ### Start cross session with Glance ### A more complete summary of this joint session will be provided by the Glance team, as they can better capture the discussions and decisions made. However, the Nova PTG notes still include a few relevant takeaways and references for those interested. ### End cross session with Glance ### #### Periodic Scheduler Update as Notification #### The proposal suggests exposing Nova’s periodic resource tracker updates as optional versioned notifications. This would help services like Watcher obtain a more complete and up-to-date view of compute resources, including NUMA topology and devices not yet modeled in Placement. While there are concerns about notification stability and data volume, the team agreed it could be useful for cross-service integrations. ✅ Support the idea in principle. ✅ Be mindful of the volume of data included in notifications. ✅ Sean will prepare a spec proposal detailing the approach. #### Resource Provider Weigher and Preferred/Avoided Traits #### The proposal introduces a resource provider weigher to influence scheduling decisions, with a longer-term goal of supporting preferred and avoided traits. This would allow external services, such as Watcher, to tag compute nodes (e.g., with CPU or memory pressure) and guide the scheduler to favor or avoid specific hosts. ✅ There are concerns about validating the weigher’s behavior at scale, ensuring it works correctly with a large number of instances. ✅ Continue developing this approach. ✅ Improve the test framework, despite existing challenges. ✅ Add Monte Carlo–style functional tests to validate behavior in complex, non-symmetric scenarios. #### Proxying OVH’s Monitoring-Aware Scheduling #### The team discussed OVH’s proposal to enhance scheduling decisions by integrating external monitoring data. The idea is to add a filter or weigher that delegates its logic to an external plugin, allowing operators to plug in custom metrics (e.g., Prometheus, InfluxDB) without modifying Nova directly. While the use case is relevant, existing out-of-tree filters and weighers already allow similar integrations. One of the main challenges identified was how to share and maintain such code consistently across the community. ✅ Current Nova interfaces likely already support this use case. ✅ Proposal to create a dedicated repository on OpenDev for sharing and maintaining custom filters and weighers. **** Friday topics **** #### LY Corp – Graceful Shutdown Proposal #### The team discussed LY Corp’s proposal to implement graceful shutdown handling in Nova. The goal is to stop accepting new RPC requests while allowing in-progress operations, such as instance boots or live migrations to complete safely. Different designs were compared, including stopping RPC listeners or using the upcoming oslo.messaging HTTP driver, which can handle clean shutdowns more reliably. The consensus was that the complete solution must involve oslo.messaging, allowing Nova services to dynamically subscribe or unsubscribe from topics. This approach also implies an upgrade impact, requiring versioned changes to compute and scheduler topics. ✅ The current proposal needs further work, as live migration cases were not yet considered. ✅ Gmaan will continue investigation and refine the approach based on oslo.messaging improvements. ✅ A revised spec will be submitted once ready. ✅ Gmaan confirmed commitment to follow up and lead this feature. #### Offline VM Migration Using HTTP-Based File Server #### The team discussed a proposal to enable offline VM migration using an HTTP-based file server. The preferred approach is to use WebDAV, which provides a standard protocol and existing server implementations. Nova itself will not host the web server and will be restricted to paths under /var/lib/nova. ✅ Use WebDAV as the preferred protocol. ✅ Avoid introducing non-standard protocols in Nova. ✅ Nova will not spawn or host the web server directly. ✅ Define a URL template in configuration for the remote filesystem driver (e.g., remotefs_url = https://%(host)s:9999/path/to/dav). ✅ Add DevStack support to test the feature in CI. #### PCI and VGPU Scheduling Performance in Placement The team revisited the performance issues with PCI and VGPU scheduling in Placement. Two workaround sets have already been implemented to reduce the number of valid and invalid candidates, but the core scalability problem of the GET /allocation_candidates query remains, especially in large, symmetric provider trees. A long-term constraint solver approach is under consideration, and the discussion will continue once more data is available from current deployments. ✅ Keep the current workarounds active and gather feedback over the next six months. ✅ Nova-next may run with these settings enabled to collect early results. ✅ Revisit the topic and defaulting decisions at the next PTG. ✅ Keep the issue open for urgent improvements if needed before the next cycle. #### Multithread and Multiqueue Support for Libvirt #### The team discussed adding multithread and multiqueue support in Nova for libvirt-based instances. While QEMU already enables multiqueue for virtio-blk and virtio-scsi by default, the main focus is now on IOThread support and improving parallelism during I/O and live migrations. ✅ Enable IOThreads with one thread per device by default (handled as a specless blueprint). ✅ virtio-blk and virtio-scsi specs are parked. ✅ Cancel the multiqueue work, since QEMU now manages it natively. ✅ The parallel migration blueprint is approved as specless. ✅ The earlier proposed spec will be abandoned in favor of this simplified path forward. #### AZ-Aware Scheduling (Soft Anti-Affinity) #### The team discussed improving availability zone–aware scheduling by introducing a soft anti-affinity policy for server groups. ✅ The overall direction is good, but the spec still needs more work. ✅ The team is broadly supportive of continuing in this direction. ✅ A spec will be proposed by Dmitriy. #### NUMA-Aware Placement (CloudFerro Proposal) #### The team discussed CloudFerro’s proposal to enable NUMA-aware scheduling in Placement, based on the old Ussuri spec. The goal is to represent NUMA nodes as resource providers to allow better locality handling for CPU and memory resources. However, this raises potential performance concerns, especially when combined with PCI in Placement, as both increase candidate permutations. ✅ Ensure NUMA and PCI in Placement work together correctly before expanding scope. ✅ Do not move PCI devices under NUMA subtrees yet. ✅ Add functional tests to validate the combined behavior. ✅ Consider extending CI to run on hosts with real NUMA topology. ✅ Enable NUMA awareness in nova-next (single NUMA node for now). ✅ Investigate with the infra team the possibility of adding dual-NUMA test nodes. ✅ Improvements to Placement’s group_policy remain out of scope for this work. ✅ The team is happy with the current direction and looks forward to future patches landing in master. #### WSGI Script Removal #### The team discussed removing the legacy wsgi_script support from Nova. No objections were raised, and no spec is required. ✅ Proceed with the removal, the team is aligned and ready to move forward. #### Improving Cyborg Support #### The team discussed reviving Cyborg integration efforts in Nova. Several aspects remain unfinished, including proper mdev GPU XML generation, support for additional device buses (block, NVMe, CXL, USB), and handling ownership overlap between Nova and Cyborg in Placement. The plan is to resume this work gradually, starting with the most mature components. ✅ Restart the Cyborg–Nova integration effort. ✅ Split the work into multiple specs, as each part is complex enough to warrant separate discussion. ✅ Focus first on mdev support, then extend to other buses (block, NVMe, etc.). ✅ Investigate Placement ownership to avoid inventory conflicts between Nova and Cyborg. If you've read this far, thank you! 🙏 If you spot any mistakes or missing points, please don't hesitate to let me know. Best regards. René.

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[publiccloud-sig] Public Cloud SIG meeting d.d. 5 November
by Kees Meijs | Nefos 04 Nov '25

04 Nov '25

Hello Stackers, Tomorrow (that's 5 November) the bi-weekly Public Cloud SIG meeting will be held again. The publicly available video meeting will be conducted from 08:00 hrs UTC (09:00 hrs CET) until 08:45 hrs UTC (09:45 hrs CET) here: https://meetpad.opendev.org/publiccloud-sig Additional information to be found on https://wiki.openstack.org/wiki/PublicCloudSIG Cheers, Kees __ Kees Meijs BICT Nefos Cloud & IT <https://nefos.com/contact> Nefos IT bv Burgemeester Mollaan 34a 5582 CK Waalre - NL kvk 66494931 +31 (0)88 2088 188 <tel:+31882088188> nefos.com <https://nefos.com/contact> The information contained in this message is intended for the addressee only and may contain classified information. If you are not the addressee, please delete this message and notify the sender; you should not copy or distribute this message or disclose its contents to anyone. Any views or opinions expressed in this message are those of the individual(s) and not necessarily of the organization. No reliance may be placed on this message without written confirmation from an authorised representative of its contents. No guarantee is implied that this message or any attachment is virus free or has not been intercepted and amended. General terms and conditions ("The NLdigital Terms") apply to all our products and services.

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[ironic][kolla][kolla-ansible] Missing DNS config during introspection
by Thomas Sell 04 Nov '25

04 Nov '25

Hey everyone, I'm facing a weird issue when trying to enroll baremetal compute hosts into Ironic using the self-enrollment/discovery method. Our Openstack is running 2025.1 and is based on Kolla-Ansible/Kayobe. What I'm seeing: - New hosts iPXE boot into IPA ramdisk. - IPA does its thing, gathering information. - IPA tries to report back to http://{{ kolla_internal_fqdn }}:5050 - The API call fails because no nameservers are available. I've tried to figure out where the IPA ramdisk is supposed to get its DNS config from and could not. There are no dhcp-options set in Ironic's dnsmasq.conf and looking at the Ansible template for this file, I believe this is by design. Inside the ramdisk /etc/resolv.conf is empty, yet IPA is configured to call-back to a FQDN, not an IP. I'm a bit puzzled about how this is supposed to work. We're using IPA images downloaded from https://tarballs.openstack.org. Do I need to build my own image? I also cannot find any mention of a separate DNS config for Ironic introspection in the documentation. Any help or hints are appreciated! Best, Thomas

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