- Users - libvirt List Archives

simulating multiple hypervisors with the test driver
by Tom Ammon 05 Jan '22

05 Jan '22

Hello, I'm working on a python application that will manage multiple remote libvirt hypervisors. I've been using the test:///default uri for single-hypervisor tests, and it works great. I'd like to simulate connecting to two different remote hypervisors, however, in my testing so far it appears that multiple connections to the test:///default uri just look like different connections to the same hypervisor. Here's what I tried : conn_one = libvirt.open('test:///default') <build and start some domains> one_vms = conn_one.listAllDomains(0) for x in one_vms: print(f"The vm in set one is {x.name()}") <get list of all the domains I just built> conn_two = libvirt.open('test:///default') <build and start some different domains> two_vms = conn_two.listAllDomains(0) for z in two_vms: print(f"The vm in set one is {z.name()}") <get list of ALL domains including those created with conn_one, not just those created using the conn_two instance> What I would like is to be able to spin up two completely independent instances of the test driver so that it can simulate two different hypervisors/instances of libvirtd. Is that possible? Thanks, Tom -- ----------------------------------------------------------------------------- Tom Ammon M: (737) 400-9042 thomasammon(a)gmail.com -----------------------------------------------------------------------------

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Best way to install guest when it is not listed in output of osinfo-query os
by john doe 04 Jan '22

04 Jan '22

Hello all, I would like to install Debian Bullseye using virt-install, as part of the command I usually specify the OS used with the option '--os-variant'. This works great untill Buster ('debian10'), but now the guest is Bullseye ('debian11') and is not listed in the output of 'osinfo-query os' (1). If I don't use the '--os-variant' flag I get the following warning: "WARNING No operating system detected, VM performance may suffer. Specify an OS with --os-variant for optimal results." Should I ignore the warning or what is the best way forward to install a Debian Bullseye guest? Both the host and the guest are Debian 11. 1) https://lists.debian.org/debian-user/2021/12/msg00742.html -- John Doe

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[FOSDEM][CFP] Virtualization & IaaS Devroom
by Piotr Kliczewski 15 Dec '21

15 Dec '21

We are excited to announce that the call for proposals is now open for the Virtualization & IaaS devroom at the upcoming FOSDEM 2022, to be hosted virtually on February 5th 2022. This year will mark FOSDEM’s 22nd anniversary as one of the longest-running free and open source software developer events, attracting thousands of developers and users from all over the world. Due to Covid-19, FOSDEM will be held virtually this year on February 5th & 6th, 2022. About the Devroom The Virtualization & IaaS devroom will feature session topics such as open source hypervisors and virtual machine managers such as Xen Project, KVM, bhyve, and VirtualBox, and Infrastructure-as-a-Service projects such as KubeVirt, Apache CloudStack, Foreman, OpenStack, oVirt, QEMU and OpenNebula. This devroom will host presentations that focus on topics of shared interest, such as KVM; libvirt; shared storage; virtualized networking; cloud security; clustering and high availability; interfacing with multiple hypervisors; hyperconverged deployments; and scaling across hundreds or thousands of servers. Presentations in this devroom will be aimed at users or developers working on these platforms who are looking to collaborate and improve shared infrastructure or solve common problems. We seek topics that encourage dialog between projects and continued work post-FOSDEM. Important Dates Submission deadline: 20th of December Acceptance notifications: 25th of December Final schedule announcement: 31st of December Recorded presentations upload deadline: 15th of January Devroom: 6th February 2022 Submit Your Proposal All submissions must be made via the Pentabarf event planning site[1]. If you have not used Pentabarf before, you will need to create an account. If you submitted proposals for FOSDEM in previous years, you can use your existing account. After creating the account, select Create Event to start the submission process. Make sure to select Virtualization and IaaS devroom from the Track list. Please fill out all the required fields, and provide a meaningful abstract and description of your proposed session. Submission Guidelines We expect more proposals than we can possibly accept, so it is vitally important that you submit your proposal on or before the deadline. Late submissions are unlikely to be considered. All presentation slots are 30 minutes, with 20 minutes planned for presentations, and 10 minutes for Q&A. All presentations will need to be pre-recorded and put into our system at least a couple of weeks before the event. The presentations should be uploaded by 15th of January and made available under Creative Commons licenses. In the Submission notes field, please indicate that you agree that your presentation will be licensed under the CC-By-SA-4.0 or CC-By-4.0 license and that you agree to have your presentation recorded. For example: "If my presentation is accepted for FOSDEM, I hereby agree to license all recordings, slides, and other associated materials under the Creative Commons Attribution Share-Alike 4.0 International License. Sincerely, <NAME>." In the Submission notes field, please also confirm that if your talk is accepted, you will be able to attend the virtual FOSDEM event for the Q&A. We will not consider proposals from prospective speakers who are unsure whether they will be able to attend the FOSDEM virtual event. If you are experiencing problems with Pentabarf, the proposal submission interface, or have other questions, you can email our devroom mailing list[2] and we will try to help you. Code of Conduct Following the release of the updated code of conduct for FOSDEM, we'd like to remind all speakers and attendees that all of the presentations and discussions in our devroom are held under the guidelines set in the CoC and we expect attendees, speakers, and volunteers to follow the CoC at all times. If you submit a proposal and it is accepted, you will be required to confirm that you accept the FOSDEM CoC. If you have any questions about the CoC or wish to have one of the devroom organizers review your presentation slides or any other content for CoC compliance, please email us and we will do our best to assist you. Call for Volunteers We are also looking for volunteers to help run the devroom. We need assistance with helping speakers to record the presentation as well as helping with streaming and chat moderation for the devroom. Please contact devroom mailing list [2] for more information. Questions? If you have any questions about this devroom, please send your questions to our devroom mailing list. You can also subscribe to the list to receive updates about important dates, session announcements, and to connect with other attendees. See you all at FOSDEM! [1] https://penta.fosdem.org/submission/FOSDEM22 [2] iaas-virt-devroom at lists.fosdem.org

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Libvirt on little.BIG ARM systems unable to start guest if no cpuset is provided
by Qu Wenruo 14 Dec '21

14 Dec '21

Hi, Recently I got my libvirt setup on both RK3399 (RockPro64) and RPI CM4, with upstream kernels. For RPI CM4 its mostly smooth sail, but on RK3399 due to its little.BIG setup (core 0-3 are 4x A55 cores, and core 4-5 are 2x A72 cores), it brings quite some troubles for VMs. In short, without proper cpuset to bind the VM to either all A72 cores or all A55 cores, the VM will mostly fail to boot. Currently the working xml is: <vcpu placement='static' cpuset='4-5'>2</vcpu> <cpu mode='host-passthrough' check='none'/> But even with vcpupin, pinning each vcpu to each physical core, VM will mostly fail to start up due to vcpu initialization failed with -EINVAL. This brings a problem, in theory RK3399 SoC should out-perform BCM2711 in multi-core performance, but if a VM can only be bind to either A72 or A55 cores, then the performance is no longer competitive against BCM2711, wasting the PCIE 2.0 x4 capacity. I guess with projects like Asahi Linux making progress, there will be more and more such problems. Any clue on how to properly pass all physical CPU cores to VM for little.BIG setup? Thanks, Qu

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Guest vm doesn't recover after the nfs connection resume
by Liang Cong 14 Dec '21

14 Dec '21

Dear developers： I found one issue during regular test and I could not confirm whether it is a libvirt|qemu issue or it is a nfs client issue or it is not an issue, so could you help to check it? Below is the issue reproduce steps: 1.there is a nfs server with exports file like: /nfs *(async,rw,no_root_squash) 2. host machine soft mount nfs: mount nfs_server_ip:/nfs /var/lib/libvirt/images/nfs -o v4,soft 3. start a guest vm with disk tag xml like below: <disk type='file' device='disk'> <driver name='qemu' type='qcow2'/> <source file='/var/lib/libvirt/images/nfs/RHEL-8.6.0-20211102.1-x86_64.qcow2' index='1'/> <backingStore/> <target dev='vda' bus='virtio'/> <alias name='virtio-disk0'/> </disk> 4.Start the vm and during the guest vm boot, apply the iptables rule to drop the nfs connection to nfs server iptables -A OUTPUT -d nfs_server_ip -p tcp --dport 2049 -j DROP 5. Wait until the error log appear in /var/log/message kernel: nfs: server nfs_server_ip not responding, timed out 6. delete the iptables rule to retain the connection to nfs server iptables -D OUTPUT -d nfs_server_ip -p tcp --dport 2049 -j DROP 7. check the guest vm, found the boot process with error and can not recover. rror: ../../grub-core/disk/i386/pc/biosdisk.c:546:failure reading sector 0x7ab8 from `hd0'. error: ../../grub-core/disk/i386/pc/biosdisk.c:546:failure reading sector 0x9190 from `hd0'. error: ../../grub-core/disk/i386/pc/biosdisk.c:546:failure reading sector 8. found there is error message in /var/log/message kernel: NFS: __nfs4_reclaim_open_state: Lock reclaim failed! Thanks Liang Cong

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internal error - invalid characters
by lejeczek 13 Dec '21

13 Dec '21

Hi guys. Have you seen something like this below? ... internal error: The string resource has invalid characters in its value internal error: The provided value contains invalid characters: Solarstorm SFN5162F SFP+ Server Adapter this if from journal logs. This hardware model of the NICs which comprise make up a team/bridge which libvirt net use, but what would 'libvirtd' bother with that? many thanks, L.

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Libgfapi gone too?
by lejeczek 12 Dec '21

12 Dec '21

Hi guys. Is glusterFS/libgfapi support removed (permanently) too? In CentOS 9 Stream. thanks, L.

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a test email (& dmarc) @admins
by lejeczek 10 Dec '21

10 Dec '21

hi guys. I sent email a while ago and I wonder, also having not received a single reply, because I did not get that own email - is there are problem I'm having here or DMARC(yahoo & others?) are not fixed in by this mailing list - would an admin(anybody) know? many thanks, L.

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Qemu monitor info tlb gives unable to encode message payload
by Philipp Klocke 08 Dec '21

08 Dec '21

Hi, the command virsh qemu-monitor-command ubuntu_vm --hmp --cmd "info tlb" fails with "error: Unable to encode message payload". I found a bugtracker entry for a similiar error [1], but I don't if this is the same error (message too large). I also don't know how large an info tlb message is. Preferably I would not have to recompile libvirt just to issue this monitor command.. Then I thought about circumventing the error by connecting directly to the qemu monitor via netcat, but I found a thread [2] that says I cannot add my own "-monitor tcp:..." to the Qemu commandline arguments. Could someone help me with this? Best, Philipp [1] https://bugzilla.redhat.com/show_bug.cgi?id=1440683 [2] https://libvirt-users.redhat.narkive.com/E0UTmdhU/is-there-a-way-to-disable…

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No QXL in CentOS 9 Stream?
by lejeczek 07 Dec '21

07 Dec '21

Hi. There seems to be no QXL (and Spice?) support in versions from CentOS 9 repos. Would anybody know if that intended, because something else replaces qxl perhaps? thanks, L

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