January 2021 - openstack-discuss - lists.openstack.org

Fwd: DPDK+OVS with OpenStack
by Mark Wittling 23 Apr '25

23 Apr '25

Looking for someone who knows OpenStack with OpenVSwitch, and in addition to that, DPDK with OpenStack and OVS.I am using OpenStack Queens, with OpenVSwitch. The architecture I am using is documented here: https://docs.openstack.org/neutron/queens/admin/deploy-ovs-provider.htmlThe OVS I am using on the Compute Node, is compiled with DPDK, and I have enabled the datapath to netdev (DPDK) on br-prv (provider network bridge), and br-tun (tunneling bridge). But these two bridges, br-tun and br-prv, are patched into another OpenStack bridge, called br-int. I wasn’t actually sure about whether to tinker with this bridge, and wondered what datapath it was using.Then, I realized there is a parameter in the openvswitch_agent.ini file, which I will list here: # OVS datapath to use. 'system' is the default value and corresponds to the # kernel datapath. To enable the userspace datapath set this value to 'netdev'. # (string value) # Possible values: # system - <No description provided> # netdev - <No description provided> #datapath_type = system datapath_type = netdev So in tinkering with this, what I realized, is that when you set this datapath_type to system or netdev, it will adjust the br-int bridge to that datapath type.So here is my question. How can I launch a non-DPDK VM, if all of the bridges are using the netdev datapath type?Here is another question. What if one of the flavors don’t have the largepages property set on them? I assumed OpenStack would revert to a system datapath and not use DPDK for those VM interfaces. Well, I found out in testing, that is not the case. If you set all your bridges up for netdev, and you don’t set the property on the Flavor of the VM (largepages), the VM will launch, but it simply won’t work.Is there no way, on a specific Compute Host, to support both DPDK (netdev datapaths) and non-DPDK (system datapaths)?Either on a VM interface level (VM has one interface that is netdev DPDK and another that is system datapath non-DPDK)?Or on a VM by VM basis (VM 1 has 1 or more netdev datapath interfaces and VM 2 has 1 or more system datapath interfaces)?Am I right here? Once you set up a Compute Host for DPDK, it’s DPDK or nothing on that Compute Host? (edited)

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How to config DPDK compute in OVN
by dangerzone ar 22 Apr '25

22 Apr '25

Hi....as far I understand ovs does support dpdk compute to be deployed. I'm referring to the guideline ' *https://docs.openstack.org/networking-ovn/queens/admin/dpdk.html <https://docs.openstack.org/networking-ovn/queens/admin/dpdk.html>* ' ... It's too brief.. May I know how to config dpdk compute in OVN networking openstack? Hope someone could help what is the config to be done.... Currently compute is run without dpdk over openstack train ovn based. Please need some info on how I can proceed. Thank you

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[all] Dynamic Zuul results table in Gerrit 3
by Radosław Piliszek 05 Aug '22

05 Aug '22

Hello Fellow OpenStack and OpenDev Folks! TL;DR click on [3] and enjoy. I am starting this thread to not hijack the discussion happening on [1]. First of all, I would like to thank gibi (Balazs Gibizer) for hacking a way to get the place to render the table in the first place (pun intended). I have been a long-time-now user of [2]. I have improved and customised it for myself but never really got to share back the changes I made. The new Gerrit obviously broke the whole script so it was of no use to share at that particular state. However, inspired by gibi's work, I decided to finally sit down and fix it to work with Gerrit 3 and here it comes: [3]. Works well on Chrome with Tampermonkey. Not tested others. I hope you will enjoy this little helper (I do). I know the script looks super fugly but it generally boils down to a mix of styles of 3 people and Gerrit having funky UI rendering. Finally, I'd also like to thank hrw (Marcin Juszkiewicz) for linking me to the original Michel's script in 2019. [1] http://lists.openstack.org/pipermail/openstack-discuss/2020-November/019051… [2] https://opendev.org/x/coats/src/commit/444c95738677593dcfed0cfd9667d4c4f0d5… [3] https://gist.github.com/yoctozepto/7ea1271c299d143388b7c1b1802ee75e Kind regards, -yoctozepto

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[nova][dev] Revisiting qemu emulation where guest arch != host arch
by Apsey, Christopher 06 Jan '22

06 Jan '22

All, A few years ago I asked a question[1] about why nova, when given a hw_architecture property from glance for an image, would not end up using the correct qemu-system-xx binary when starting the guest process on a compute node if that compute nodes architecture did not match the proposed guest architecture. As an example, if we had all x86 hosts, but wanted to run an emulated ppc guest, we should be able to do that given that at least one compute node had qemu-system-ppc already installed and libvirt was successfully reporting that as a supported architecture to nova. It seemed like a heavy lift at the time, so it was put on the back burner. I am now in a position to fund a contract developer to make this happen, so the question is: would this be a useful blueprint that would potentially be accepted? Most of the time when people want to run an emulated guest they would just nest it inside of an already running guest of the native architecture, but that severely limits observability and the task of managing any more than a handful of instances in this manner quickly becomes a tangled nightmare of networking, etc. I see real benefit in allowing this scenario to run natively so all of the tooling that exists for fleet management 'just works'. This would also be a significant differentiator for OpenStack as a whole. Thoughts? [1] http://lists.openstack.org/pipermail/openstack-operators/2018-August/015653… Chris Apsey Director | Georgia Cyber Range GEORGIA CYBER CENTER 100 Grace Hopper Lane | Augusta, Georgia | 30901 https://www.gacybercenter.org

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Help with eventlet 0.26.1 and dnspython >= 2
by Thomas Goirand 05 Oct '21

05 Oct '21

Hi, As you may know, eventlet is incompatible with dnspython >= 2.0.0.0rc1. See [1] for the details. However, Debian unstable has 2.0.0. Would there be some good soul willing to help me fix this situation? I would need a patch to fix this, but I'm really not sure how to start. Cheers, Thomas Goirand (zigo)

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[all]Introduction to venus which is the project of log management and has been contributed to the OpenStack community
by Liye Pang(逄立业) 10 Sep '21

10 Sep '21

Hello everyone, after feedback from a large number of operations and maintenance personnel in InCloud OpenStack, we developed the log management project “Venus” for the OpenStack projects and that has contributed to the OpenStack community. The following is an introduction to “Venus”. If there is interest in the community, we are interested in proposing it to become an official OpenStack project in the future. Background In the day-to-day operation and maintenance of large-scale cloud platform, the following problems are encountered： l Time-consuming for log querying while the server increasing to thousands. l Difficult to retrieve logs, since there are many modules in the platform, e.g. systems service, compute, storage, network and other platform services. l The large amount and dispersion of log make faults are difficult to be discovered. l Because of distributed and interaction between components of the cloud platform, and scattered logs between components, it will take more time to locate problems. About Venus According to the key requirements of OpenStack in log storage, retrieval, analysis and so on, we introduced Venus project, a unified log management module. This module can provide a one-stop solution to log collection, cleaning, indexing, analysis, alarm, visualization, report generation and other needs, which involves helping operator or maintainer to quickly solve retrieve problems, grasp the operational health of the platform, and improve the management capabilities of the cloud platform. Additionally, this module plans to use machine learning algorithms to quickly locate IT failures and root causes, and improve operation and maintenance efficiency. Application scenario Venus played a key role in the following scenarios： l Retrieval: Provide a simple and easy-to-use way to retrieve all log and the context. l Analysis: Realize log association, field value statistics, and provide multi-scene and multi-dimensional visual analysis reports. l Alerts：Convert retrieval into active alerts to realize the error finding in massive logs. l Issue location: Establish a chain relationship and knowledge graphs to quickly locate problems. Overall structure The architecture of log management system based on Venus and elastic search is as follows: Diagram 0: Architecture of Venus venus_api: API module，provide API、rest-api service. venus_manager: Internal timing task module to realize the core functions of the log system. Current progress The current progress of the Venus project is as follows: l Collection：Develop fluentd collection tasks based on collectd to read, filter, format and send plug-ins for OpenStack, operating systems, and platform services, etc. l Index：Dealing with multi-dimensional index data in elasticsearch, and provide more concise and comprehensive authentication interface to return query results. l Analysis：Analyzing and display the related module errors, Mariadb connection errors, and Rabbitmq connection errors. l Alerts：Develop alarm task code to set threshold for the number of error logs of different modules at different times, and provides alarm services and notification services. l Location：Develop the call chain analysis function based on global_requested series, which can show the execution sequence, time and error information, etc., and provide the export operation. l Management：Develop configuration management functions in the log system, such as alarm threshold setting, timing task management, and log saving time setting, etc. Application examples Two examples of Venus application scenarios are as follows. 1. The virtual machine creation operation was performed on the cloud platform and it was found that the virtual machine was not created successfully. First, we can find the request id of the operation and jump to the virtual machine creation call chain page. Then, we can query the calling process, view and download the details of the log of the call. 2. In the cloud platform, the error log of each module can be converted into alarms to remind the users. Further, we can retrieve the details of the error log and error log statistics. Next step The next step of the Venus project is as follows: * Collection：In addition to fluent, other collection plugins such as logstash will be integrated. * Analysis: Explore more operation and maintenance scenarios, and conduct statistical analysis and alarm on key data. * display: The configuration, analysis and alarm of Venus will be integrated into horizon in the form of plugin. * location: Form clustering log and construct knowledge map, and integrate algorithm class library to locate the root cause of the fault. Venus Project Registry Venus library: https://opendev.org/inspur/venus You can grab the source code using the following git command: git clone https://opendev.org/inspur/venus.git Venus Demo Youtu.be: <https://youtu.be/mE2MoEx3awM> https://youtu.be/mE2MoEx3awM

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[simplification] Making ask.openstack.org read-only
by Thierry Carrez 28 May '21

28 May '21

Hi everyone, This has been discussed several times on this mailing list in the past, but we never got to actually pull the plug. Ask.openstack.org was launched in 2013. The reason for hosting our own setup was to be able to support multiple languages, while StackOverflow rejected our proposal to have our own openstack-branded StackExchange site. The Chinese ask.o.o side never really took off. The English side also never really worked perfectly (like email alerts are hopelessly broken), but we figured it would get better with time if a big community formed around it. Fast-forward to 2020 and the instance is lacking volunteers to help run it, while the code (and our customization of it) has become more complicated to maintain. It regularly fails one way or another, and questions there often go unanswered, making us look bad. Of the top 30 users, most have abandoned the platform since 2017, leaving only Bernd Bausch actively engaging and helping moderate questions lately. We have called for volunteers several times, but the offers for help never really materialized. At the same time, people are asking OpenStack questions on StackOverflow, and sometimes getting answers there[1]. The fragmentation of the "questions" space is not helping users getting good answers. I think it's time to pull the plug, make ask.openstack.org read-only (so that links to old answers are not lost) and redirect users to the mailing-list and the "OpenStack" tag on StackOverflow. I picked StackOverflow since it seems to have the most openstack questions (2,574 on SO, 76 on SuperUser and 430 on ServerFault). We discussed that option several times, but I now proposed a change to actually make it happen: https://review.opendev.org/#/c/746497/ It's always a difficult decision to make to kill a resource, but I feel like in this case, consolidation and simplification would help. Thoughts, comments? [1] https://stackoverflow.com/questions/tagged/openstack -- Thierry

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[stein][neutron] gratuitous arp
by Ignazio Cassano 14 May '21

14 May '21

Hello, I have a problem on stein neutron. When a vm migrate from one node to another I cannot ping it for several minutes. If in the vm I put a script that ping the gateway continously, the live migration works fine and I can ping it. Why this happens ? I read something about gratuitous arp. Please, help me ? Any workaround , please ? Best Regards Ignazio

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[ironic] Announcing deprecation of the iSCSI deploy interface
by Dmitry Tantsur 04 May '21

04 May '21

Hi all, Following up to the previous mailing list [1] and virtual meetup [2] discussions, I would like to announce the plans to deprecate the 'iscsi' deploy interface. This is the updated plan discussed on the virtual meetup: 1) In the Victoria cycle (i.e. right now): - Fill in the detected feature gaps [3]. - Switch off the iscsi deploy interface by default. - Change [agent]image_dowload_source to HTTP by default. - Give the direct deploy a higher priority, so that it's used by default unless disabled. - Mark it as deprecated in the code (causing warnings when enabled). - Release a major version of ironic to highlight the defaults changes. 2) In the W cycle: - Keep the iscsi deploy deprecated. - Listen to operators' feedback. 3) In the X cycle - Remove the iscsi deploy completely from ironic and IPA. - Remove support code from ironic-lib with a major version bump. Please let us know if you have any questions or concerns. Dmitry [1] http://lists.openstack.org/pipermail/openstack-discuss/2020-August/016681.h… [2] https://etherpad.opendev.org/p/Ironic-Victoria-midcycle [3] https://storyboard.openstack.org/#!/story/2008075 -- Red Hat GmbH, https://de.redhat.com/ , Registered seat: Grasbrunn, Commercial register: Amtsgericht Muenchen, HRB 153243, Managing Directors: Charles Cachera, Brian Klemm, Laurie Krebs, Michael O'Neill

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[barbican][oslo][nova][glance][cinder] cursive library status
by Brian Rosmaita 04 May '21

04 May '21

Hello Barbican team, Apologies for not including barbican in the previous thread on this topic: http://lists.openstack.org/pipermail/openstack-discuss/2020-December/019430… The situation is that cursive is used by Nova, Glance, and Cinder and we'd like to move it out of the 'x' namespace into openstack governance. The question is then what team would oversee it. It seems like a good fit for Oslo, and the Oslo team seems OK with that, but since barbican-core is currently included in cursive-core, it make sense to give the Barbican team first dibs. From the consuming teams' side, I don't think we have a preference as long as it's clear who we need to bother about approvals if a bugfix is posted for review. Thus my ask is that the Barbican team indicate whether they'd like to move cursive to the 'openstack' namespace under their governance, or whether they'd prefer Oslo to oversee the library. Thank you! brian

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