December 2019 - Users - libvirt List Archives

[libvirt-users] [virtual interface] detach interface during boot succeed with no changes
by Yalan Zhang 08 Sep '22

08 Sep '22

Hi guys, when I detach an interface from vm during boot (vm boot not finished), it always fail. I'm not sure if there is an existing bug. I have confirmed with someone that for disk, there is similar behavior, if this is also acceptable? # virsh destroy rhel7.2; virsh start rhel7.2 ;sleep 2; virsh detach-interface rhel7.2 network 52:54:00:98:c4:a0; sleep 2; virsh dumpxml rhel7.2 |grep /interface -B9 Domain rhel7.2 destroyed Domain rhel7.2 started Interface detached successfully <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> </controller> <interface type='network'> <mac address='52:54:00:98:c4:a0'/> <source network='default' bridge='virbr0'/> <target dev='vnet0'/> <model type='rtl8139'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> When I detach after the vm boot, expand the sleep time to 10, it will succeed. # virsh destroy rhel7.2; virsh start rhel7.2 ;sleep 10; virsh detach-interface rhel7.2 network 52:54:00:98:c4:a0; sleep 2; virsh dumpxml rhel7.2 |grep /interface -B9 Domain rhel7.2 destroyed Domain rhel7.2 started Interface detached successfully ------- Best Regards, Yalan Zhang IRC: yalzhang Internal phone: 8389413

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[libvirt-users] Live migrate + change interface name
by Marc Roos 07 Oct '20

07 Oct '20

Is it possible to do a live migrate of a guest, having on the from host a source_device=eth2 and to host a source_dev=eth1?

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[libvirt-users] Add Virtlyst to the list of libvirt users
by Daniel Nicoletti 23 Sep '20

23 Sep '20

Hi, I've just released v1.0.0 of Virtlyst[1] a web tool to manage VMs using Qt/C++/Cutelyst https://dantti.wordpress.com/2018/04/19/announcing-virtlyst-a-web-interface… Thanks. 1 - https://github.com/cutelyst/Virtlyst -- Daniel Nicoletti KDE Developer - http://dantti.wordpress.com

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[libvirt-users] Question about disabling UFO on guest
by Bao Nguyen 05 Aug '20

05 Aug '20

Hello everyone, I would like to ask a question regarding to disable UFO of virtio vNIC in my guest. I have read the document at https://libvirt.org/formatdomain.html *host* The csum, gso, tso4, tso6, ecn and ufo attributes with possible values on and off can be used to turn off host offloading options. By default, the supported offloads are enabled by QEMU. *Since 1.2.9 (QEMU only)* The mrg_rxbuf attribute can be used to control mergeable rx buffers on the host side. Possible values are on (default) and off. *Since 1.2.13 (QEMU only)* *guest* The csum, tso4, tso6, ecn and ufo attributes with possible values on and off can be used to turn off guest offloading options. By default, the supported offloads are enabl ed by QEMU. *Since 1.2.9 (QEMU only)* Then I disabled UFO on my vNIC on guest as the following configuration <devices> <interface type='network'> <source network='default'/> <target dev='vnet1'/> <model type='virtio'/> <driver name='vhost' txmode='iothread' ioeventfd='on' event_idx='off' queues='5' rx_queue_size='256' tx_queue_size='256'> *<host gso='off' ufo='off' />* *<guest ufo='off'/>* </driver> </interface> </devices> Then I reboot my node to get the change effect and it works. However, can I disable the UFO without touching the host OS? or it always has to disable on both host and guest like that? Thanks, Brs, Natsu

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[libvirt-users] Locking without virtlockd (nor sanlock)?
by Gionatan Danti 07 Jan '20

07 Jan '20

Hi list, I would like to ask a clarification about how locking works. My test system is CentOS 7.7 with libvirt-4.5.0-23.el7_7.1.x86_64 Is was understanding that, by default, libvirt does not use any locks. From here [1]: "The out of the box configuration, however, currently uses the nop lock manager plugin". As "lock_manager" is commented in my qemu.conf file, I was expecting that no locks were used to protect my virtual disk from guest double-start or misassignement to other vms. However, "cat /proc/locks" shows the following (17532905 being the vdisk inode): [root@localhost tmp]# cat /proc/locks | grep 17532905 42: OFDLCK ADVISORY READ -1 fd:00:17532905 201 201 43: OFDLCK ADVISORY READ -1 fd:00:17532905 100 101 Indeed, try to associate and booting the disk to another machines give me an error (stating that the disk is alredy in use). Enabling the "lockd" plugin and starting the same machine, "cat /proc/locks" looks different: [root@localhost tmp]# cat /proc/locks | grep 17532905 31: POSIX ADVISORY WRITE 19266 fd:00:17532905 0 0 32: OFDLCK ADVISORY READ -1 fd:00:17532905 201 201 33: OFDLCK ADVISORY READ -1 fd:00:17532905 100 101 As you can see, an *additional* write lock was granted. Again, assigning the disk to another vms and booting it up ends with the same error. So, may I ask: - why does libvirtd requests READ locks even commenting the "lock_manager" option? - does it means that I can avoid modifying anything, relying on libvirtd to correctly locks image files? - if so, I should use virtlockd for what use cases? Thanks. [1] https://libvirt.org/locking-lockd.html -- Danti Gionatan Supporto Tecnico Assyoma S.r.l. - www.assyoma.it email: g.danti(a)assyoma.it - info(a)assyoma.it GPG public key ID: FF5F32A8

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[libvirt-users] aarch64 vm doesn't boots
by daggs 07 Jan '20

07 Jan '20

Greetings, I'm trying to bring up a alpine rpi aarch64 image within kvm but I'm ended up with a stuck system, here is the xml: <domain type='qemu'> <name>alpine_rpi4_dev_machine</name> <uuid>b1b155fc-cb92-4f22-8904-c934dd24415b</uuid> <memory unit='KiB'>4194304</memory> <currentMemory unit='KiB'>4194304</currentMemory> <vcpu placement='static'>4</vcpu> <os> <type arch='aarch64' machine='virt'>hvm</type> </os> <features> <gic version='2'/> </features> <cpu mode='custom' match='exact'> <model fallback='allow'>cortex-a53</model> </cpu> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <devices> <emulator>/usr/bin/qemu-system-aarch64</emulator> <disk type='file' device='disk'> <driver name='qemu' type='qcow2'/> <source file='/home/dagg/alpine-rpi4.qcow2'/> <target dev='vda' bus='virtio'/> <boot order='2'/> <address type='virtio-mmio'/> </disk> <disk type='file' device='cdrom'> <driver name='qemu' type='raw'/> <source file='/home/dagg/alpine-virt-3.11.2-aarch64.iso'/> <target dev='sdb' bus='scsi'/> <readonly/> <boot order='1'/> <address type='drive' controller='0' bus='0' target='0' unit='1'/> </disk> <controller type='scsi' index='0' model='virtio-scsi'> <address type='virtio-mmio'/> </controller> <controller type='pci' index='0' model='pcie-root'/> <controller type='pci' index='1' model='dmi-to-pci-bridge'> <model name='i82801b11-bridge'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'/> </controller> <controller type='pci' index='2' model='pci-bridge'> <model name='pci-bridge'/> <target chassisNr='2'/> <address type='pci' domain='0x0000' bus='0x01' slot='0x01' function='0x0'/> </controller> <controller type='virtio-serial' index='0'> <address type='virtio-mmio'/> </controller> <interface type='network'> <mac address='52:54:00:e0:7a:7b'/> <source network='default'/> <model type='virtio'/> <address type='virtio-mmio'/> </interface> <serial type='pty'> <target port='0'/> </serial> <console type='pty'> <target type='serial' port='0'/> </console> <console type='pty'> <target type='virtio' port='1'/> </console> </devices> </domain> generated using this cmd: virt-install --cpu cortex-a53 --name alpine_rpi4_dev_machine --cdrom ./alpine-virt-3.11.2-aarch64.iso --disk path=alpine-rpi4.qcow2,size=8 --vcpus 4 --memory 2048 --os-type linux --arch aarch64 I've tried adding a vnc server and vga device but the screen stays black, qxl doesn't work. I'm using ubuntu 16.04 with libvirt 1.3.1, if this is a version issue, I can upgrade to latest version. what I'm I missing? Thanks, Dagg.

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[libvirt-users] [Xen] + [Libvirt] + [TPM]: can it work?
by Arthur Borsboom 02 Jan '20

02 Jan '20

I am trying to get TPM 2.0 pass through to work with Xen and libvirt, but I can't get it to work. According to the following sites both Xen and libirt have TPM 2.0 support. https://wiki.xen.org/wiki/Virtual_Trusted_Platform_Module_(vTPM) https://libvirt.org/formatdomain.html#elementsTpm However, when I add a TPM device to a VM (by virt-manager), the VM guest XML does contain the TPM configuration, but the VM guest (linux) does not show any TPM device. Also, when looking in /var/log/libvirt/libxl/vmguest.log there is no mention of tpm in the (converted libvirt XML to libxl) vm structure. Is this because libvirt only supports TPM with QEMU? If so, are there any development plans for TPM support with XEN? Is there a workaround for the time being? -- Arthur Borsboom Mob: +31629089953 Email: arthurborsboom(a)gmail.com [image: View Arthur's LinkedIn profile] <http://uk.linkedin.com/in/arthurborsboom>

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[libvirt-users] (no subject)
by Mauricio Tavares 23 Dec '19

23 Dec '19

When I use kvm+libvirt as my hypervisor at home, I usually pass logical volumes as the guests' drives (I probably can do better but the disk here is just a garden-variety SSD, not NVMe). <emulator>/usr/libexec/qemu-kvm</emulator> <disk type='file' device='disk'> <driver name='qemu' type='raw' cache='none' io='native'/> <source file='/dev/vmhost_vg0/desktop'/> <target dev='vda' bus='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </disk> That works fine as local drives, but what about if I want to use the network storage (can provide nfs and iscsi)? Should I: 1. Create one iscsi target for each guest? Reasoning here is that some OS can boot off iscsi. 2. Create a local lv with the minimum required disk space to boot, and then network mount the rest be it as nfs or iscsi? 3. Create a large iscsi target, do not format it, but instead configure it as a lvm, handing out logical volumes as before? So the vm guest won't know any better. I am leaning towards door #3, but I am open for suggestions.

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[libvirt-users] Add support for vhost-user-scsi-pci/vhost-user-blk-pci
by Li Feng 22 Dec '19

22 Dec '19

Hi Guys, And I want to add the vhost-user-scsi-pci/vhost-user-blk-pci support for libvirt. The usage in qemu like this: Vhost-SCSI -chardev socket,id=char0,path=/var/tmp/vhost.0 -device vhost-user-scsi-pci,id=scsi0,chardev=char0 Vhost-BLK -chardev socket,id=char1,path=/var/tmp/vhost.1 -device vhost-user-blk-pci,id=blk0,chardev=char1 What type should I add for libvirt. Type1: <hostdev mode='subsystem' type='vhost-user'> <source protocol='vhost-user-scsi' path='/tmp/vhost-scsi.sock'></source> <alias name="vhost-user-scsi-disk1"/> </hostdev> Type2: <disk type='network' device='disk'> <driver name='qemu' type='raw' cache='none' io='native'/> <source protocol='vhost-user' path='/tmp/vhost-scsi.sock'> </source> <target dev='sdb' bus='vhost-user-scsi'/> <boot order='3'/> <alias name='scsi0-0-0-1'/> <address type='drive' controller='0' bus='0' target='0' unit='1'/> </disk> <disk type='network' device='disk'> <driver name='qemu' type='raw' cache='none' io='native'/> <source protocol='vhost-user' path='/tmp/vhost-blk.sock'> </source> <target dev='vda' bus='vhost-user-blk'/> <boot order='1'/> <alias name='virtio-disk0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/> </disk> Could anyone give some suggestions? Thanks, Feng Li -- The SmartX email address is only for business purpose. Any sent message that is not related to the business is not authorized or permitted by SmartX. 本邮箱为北京志凌海纳科技有限公司（SmartX）工作邮箱. 如本邮箱发出的邮件与工作无关,该邮件未得到本公司任何的明示或默示的授权.

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[libvirt-users] CfP VHPC20: HPC Containers-Kubernetes
by VHPC 20 19 Dec '19

19 Dec '19

==================================================================== CALL FOR PAPERSa 15th Workshop on Virtualization in High-Performance Cloud Computing (VHPC 20) held in conjunction with the International Supercomputing Conference - High Performance, June 21-25, 2020, Frankfurt, Germany. (Springer LNCS Proceedings) ==================================================================== Date: June 25, 2020 Workshop URL: vhpc[dot]org Abstract registration Deadline: Jan 31st, 2020 Paper Submission Deadline: Apr 05th, 2020 Springer LNCS Call for Papers Containers and virtualization technologies constitute key enabling factors for flexible resource management in modern data centers, and particularly in cloud environments. Cloud providers need to manage complex infrastructures in a seamless fashion to support the highly dynamic and heterogeneous workloads and hosted applications customers deploy. Similarly, HPC environments have been increasingly adopting techniques that enable flexible management of vast computing and networking resources, close to marginal provisioning cost, which is unprecedented in the history of scientific and commercial computing. Most recently, Function as a Service (Faas) and Serverless computing, utilizing lightweight VMs-containers widens the spectrum of applications that can be deployed in a cloud environment, especially in an HPC context. Here, HPC-provided services can be become accessible to distributed workloads outside of large cluster environments. Various virtualization-containerization technologies contribute to the overall picture in different ways: machine virtualization, with its capability to enable consolidation of multiple underutilized servers with heterogeneous software and operating systems (OSes), and its capability to live-migrate a fully operating virtual machine (VM) with a very short downtime, enables novel and dynamic ways to manage physical servers; OS-level virtualization (i.e., containerization), with its capability to isolate multiple user-space environments and to allow for their coexistence within the same OS kernel, promises to provide many of the advantages of machine virtualization with high levels of responsiveness and performance; lastly, unikernels provide for many virtualization benefits with a minimized OS/library surface. I/O Virtualization in turn allows physical network interfaces to take traffic from multiple VMs or containers; network virtualization, with its capability to create logical network overlays that are independent of the underlying physical topology is furthermore enabling virtualization of HPC infrastructures. Publication Accepted papers will be published in a Springer LNCS proceedings volume. Topics of Interest The VHPC program committee solicits original, high-quality submissions related to virtualization across the entire software stack with a special focus on the intersection of HPC, containers-virtualization and the cloud. Major Topics: - HPC workload orchestration (Kubernetes) - Kubernetes HPC batch - HPC Container Environments Landscape - HW Heterogeneity - Container ecosystem (Docker alternatives) - Networking - Lightweight Virtualization - Unikernels / LibOS - State-of-the-art processor virtualization (RISC-V, EPI) - Containerizing HPC Stacks/Apps/Codes: Climate model containers each major topic encompassing design/architecture, management, performance management, modeling and configuration/tooling. Specifically, we invite papers that deal with the following topics: - HPC orchestration (Kubernetes) - Virtualizing Kubernetes for HPC - Deployment paradigms - Multitenancy - Serverless - Declerative data center integration - Network provisioning - Storage - OCI i.a. images - Isolation/security - HW Accelerators, including GPUs, FPGAs, AI, and others - State-of-practice/art, including transition to cloud - Frameworks, system software - Programming models, runtime systems, and APIs to facilitate cloud adoption - Edge use-cases - Application adaptation, success stories - Kubernetes Batch - Scheduling, job management - Execution paradigm - workflow - Data management - Deployment paradigm - Multi-cluster/scalability - Performance improvement - Workflow / execution paradigm - Podman: end-to-end Docker alternative container environment & use-cases - Creating, Running containers as non-root (rootless) - Running rootless containers with MPI - Container live migration - Running containers in restricted environments without setuid - Networking - Software defined networks and network virtualization - New virtualization NICs/Nitro alike ASICs for the data center? - Kubernetes SDN policy (Calico i.a.) - Kubernetes network provisioning (Flannel i.a.) - Lightweight Virtualization - Micro VMMs (Rust-VMM, Firecracker, solo5) - Xen - Nitro hypervisor (KVM) - RVirt - Cloud Hypervisor - Unikernels / LibOS - HPC Storage in Virtualization - HPC container storage - Cloud-native storage - Hypervisors in storage virtualization - Processor Virtualization - RISC-V hypervisor extensions - RISC-V Hypervisor ports - EPI - Composable HPC microservices - Containerizing Scientific Codes - Building - Deploying - Securing - Storage - Monitoring - Use case for containerizing HPC codes: Climate model containers for portability, reproducibility, traceability, immutability, provenance, data & software preservation The Workshop on Virtualization in High-Performance Cloud Computing (VHPC) aims to bring together researchers and industrial practitioners facing the challenges posed by virtualization in order to foster discussion, collaboration, mutual exchange of knowledge and experience, enabling research to ultimately provide novel solutions for virtualized computing systems of tomorrow. The workshop will be one day in length, composed of 20 min paper presentations, each followed by 10 min discussion sections, plus lightning talks that are limited to 5 minutes. Presentations may be accompanied by interactive demonstrations. Important Dates Jan 31st, 2020 - Abstract Apr 5th, 2020 - Paper submission deadline (Springer LNCS) Apr 26th, 2020 - Acceptance notification June 25th, 2020 - Workshop Day July 10th, 2020 - Camera-ready version due Chair Michael Alexander (chair), BOKU, Vienna, Austria Anastassios Nanos (co-chair), Sunlight.io, UK Program committee Stergios Anastasiadis, University of Ioannina, Greece Paolo Bonzini, Redhat, Italy Jakob Blomer, CERN, Europe Eduardo César, Universidad Autonoma de Barcelona, Spain Taylor Childers, Argonne National Laboratory, USA Stephen Crago, USC ISI, USA Tommaso Cucinotta, St. Anna School of Advanced Studies, Italy François Diakhaté CEA DAM Ile de France, France Kyle Hale, Northwestern University, USA Brian Kocoloski, Washington University, USA John Lange, University of Pittsburgh, USA Giuseppe Lettieri, University of Pisa, Italy Klaus Ma, Huawei, China Alberto Madonna, Swiss National Supercomputing Center, Switzerland Nikos Parlavantzas, IRISA, France Anup Patel, Western Digital, USA Kevin Pedretti, Sandia National Laboratories, USA Amer Qouneh, Western New England University, USA Carlos Reaño, Queen’s University Belfast, UK Adrian Reber, Redhat, Germany Riccardo Rocha, CERN, Europe Borja Sotomayor, University of Chicago, USA Jonathan Sparks, Cray, USA Kurt Tutschku, Blekinge Institute of Technology, Sweden John Walters, USC ISI, USA Yasuhiro Watashiba, Osaka University, Japan Chao-Tung Yang, Tunghai University, Taiwan Paper Submission-Publication Papers submitted to the workshop will be reviewed by at least two members of the program committee and external reviewers. Submissions should include abstract, keywords, the e-mail address of the corresponding author, and must not exceed 10 pages, including tables and figures at a main font size no smaller than 11 point. Submission of a paper should be regarded as a commitment that, should the paper be accepted, at least one of the authors will register and attend the conference to present the work. Accepted papers will be published in a Springer LNCS volume. The format must be according to the Springer LNCS Style. Initial submissions are in PDF; authors of accepted papers will be requested to provide source files. Abstract, Paper Submission Link: edas[dot]info/newPaper.php?c=26973 Lightning Talks Lightning Talks are non-paper track, synoptical in nature and are strictly limited to 5 minutes. They can be used to gain early feedback on ongoing research, for demonstrations, to present research results, early research ideas, perspectives and positions of interest to the community. Submit abstract via the main submission link. General Information The workshop is one day in length and will be held in conjunction with the International Supercomputing Conference - High Performance (ISC) 2019, June 21-25, Frankfurt, Germany.

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[libvirt-users] Error in launching chasis
by abhishek jain 17 Dec '19

17 Dec '19

Hi I am new to Libvirt and is starting Chassis but getting following error qemu-system-x86_64:-netdev tap,id=net0,ifname=tap01,vhost=on,script=no,downscript=no: tap: open vhost char device failed:Operation not permitted What could be the reason RegardsAbhishek

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[libvirt-users] Change in treatment of qcow2 with chained backing files in v5.10.0?
by Jens John 17 Dec '19

17 Dec '19

Hello list, upon upgrading from libvirt v5.9.0 -> v5.10.0, libvirt started calling qemu differently causing the VM operating system to not be found. I'm wondering whether I'm chasing a bug, or have to otherwise fix my domain config (created by virt-manager). To start with, I have a Windows 7 domain based on the following images: windows7-base.qcow2: QEMU QCOW2 Image (v3), 53687091200 bytes windows7-Office2013.qcow2: QEMU QCOW2 Image (v3), has backing file (path windows7-taintable.qcow2), 80530636800 bytes windows7-taintable.qcow2: QEMU QCOW2 Image (v3), has backing file (path windows7-base.qcow2), 53687091200 bytes The VM must be launched with image windows7-Office2013.qcow2. Using the domain config [1] with a <disk> section <disk type='file' device='disk'> <driver name='qemu' type='qcow2'/> <source file='/home/joj/lib/vm/windows/windows7-Office2013.qcow2'/> <target dev='vda' bus='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/> </disk> libvirt 5.9.0 is calling qemu 4.2.0 like [2], and libvirt 5.10.0 like [3], the differences being (5.9.0 1st, 5.10.0 2nd lines) [--drive file=/home/joj/lib/vm/windows/windows7-Office2013.qcow2,format=qcow2,if=none,id=drive-virtio-disk0-] {+-blockdev {"driver":"file","filename":"/home/joj/lib/vm/windows/windows7-taintable.qcow2","node-name":"libvirt-2-storage","auto-read-only":true,"discard":"unmap"} -blockdev {"node-name":"libvirt-2-format","read-only":true,"driver":"raw","file":"libvirt-2-storage"} -blockdev {"driver":"file","filename":"/home/joj/lib/vm/windows/windows7-Office2013.qcow2","node-name":"libvirt-1-storage","auto-read-only":true,"discard":"unmap"} -blockdev {"node-name":"libvirt-1-format","read-only":false,"driver":"qcow2","file":"libvirt-1-storage","backing":"libvirt-2-format"}+} -device [-virtio-blk-pci,scsi=off,bus=pci.0,addr=0x7,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1-] {+virtio-blk-pci,scsi=off,bus=pci.0,addr=0x7,drive=libvirt-1-format,id=virtio-disk0,bootindex=1+} As you can see, 5.10.0 is expanding the backing file chain, not leaving that to qemu. Under 5.10.0, I get an Operating System not Found error, under 5.9.0, with the shorter -drive argument, everything works as desired. Can you perhaps advise me how I either fix the domain spec [1] to get libvirt to use a true equivalent to the old qemu invocation as I don't think this is a qemu problem, or how I can turn the new-style JSON parametrization off? Other suggestions how to tackle this would also be much appreciated. --- [1] https://0x0.st/z0KM.xml [2] https://0x0.st/z0K1.txt [3] https://0x0.st/z0Kj.txt

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[libvirt-users] Request to be allotted a project or a feature in pipeline
by Utsav Parmar 16 Dec '19

16 Dec '19

To whom it may concern, I'm Utsav Parmar, pursuing my B. Tech in Computer Engineering. I like to work on new technologies and am currently looking for open-source projects to contribute to. As it may turn out, I've got a college project in my curriculum this semester under “Software Development Practice”, and I'd like to work upon a project and/or a feature in pipeline spanning over 3 months in Libvirt organization as a part of the same college project. My mentor cum professor has already agreed for the same, given that I get approval from one of the maintainers. So, if possible, will you please allot me something to work upon? Thank you for your time. Looking forward to hearing from you. Regards, Utsav Parmar

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[libvirt-users] nvme, spdk and host linux version
by Mauricio Tavares 12 Dec '19

12 Dec '19

I have been following the patches on nvme support on the list and was wondering: If I wanted to build a vm host to be on the bleeding edge for nvme and spdk fun in libvirt, which linux distro -- fedora/ubuntu/centos/etc -- should I pick?

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[libvirt-users] What's the best way to make use of VLAN interfaces with VMs?
by Richard Achmatowicz 04 Dec '19

04 Dec '19

Hello I have a problem with attaching VMs to a VLAN interface. Here is my setup: I have several physical hosts connected by a physical switch. Each host has two NICs leading to the switch, which have been combined into a team, team0. Each host a has a bridge br1, which has team0 as a slave. So communication between hosts is based on the IP address of bridge br1 on each host. Up until recently, using libvirt and KVM, I was creating VMs which had one interface attached the default virtual network and one interface attached to the bridge: virt-install ... --network network=default --network bridge=br1 ... I would then statically assign an IP address to the bridge interface on the guest when installing the OS. A few days ago, a VLAN was introduced to split up the network. I created a new VLAN interface br1.600 on each of the hosts. My initial attempt was to do try this: virt-install ... --network network=default --network bridge=br1.600 ... which did not work. It then dawned on me that a VLAN interface and a bridge aren't treated the same. So I started to look for ways to allow my VMs to bind to this new interface. This would seem to be a common situation. What is the best way to work around this? Both the host bridge and the host VLAN interface already have their assigned IP addresses and appear like this in libvirt: [root@clusterdev01 ]# ifconfig br1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.0.110 netmask 255.255.255.0 broadcast 192.168.0.255 inet6 fe80::1e98:ecff:fe1b:276d prefixlen 64 scopeid 0x20<link> ether 1c:98:ec:1b:27:6d txqueuelen 1000 (Ethernet) RX packets 833772 bytes 2976958254 (2.7 GiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 331237 bytes 23335124 (22.2 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 br1.600: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.1.110 netmask 255.255.255.0 broadcast 192.168.1.255 inet6 fe80::1e98:ecff:fe1b:276d prefixlen 64 scopeid 0x20<link> ether 1c:98:ec:1b:27:6d txqueuelen 1000 (Ethernet) RX packets 189315 bytes 9465744 (9.0 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 302 bytes 30522 (29.8 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 [root@clusterdev01]# virsh iface-list --all Name State MAC Address --------------------------------------------------- br1 active 1c:98:ec:1b:27:6d br1.600 active 1c:98:ec:1b:27:6d [root@clusterdev01 sysadmin]# virsh iface-dumpxml br1.600 <interface type='vlan' name='br1.600'> <protocol family='ipv4'> <ip address='192.168.1.110' prefix='24'/> </protocol> <protocol family='ipv6'> <ip address='fe80::1e98:ecff:fe1b:276d' prefix='64'/> </protocol> <link state='up'/> <vlan tag='600'> <interface name='br1'/> </vlan> </interface> I tried following some suggestions which wrapped the vlan interface in a bridge interface, but in ended up trashing the br1.600 interface which was originally defined on the host. Is there a failsafe way to deal with such a situation? Am I doing something completely wrong here? In would like br1.600 to behave like br1 ..... Any suggestions or advice greatly appreciated. Richard

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[libvirt-users] Converting LVM to qcow2
by ort_libvirt＠bergersen.no 03 Dec '19

03 Dec '19

Hi! I need to convert a KVM virtual machine from LVM to a qcow2 image, and wonder if this is the best way to do it (*1): [$] qemu-img convert -O qcow2 /dev/vg_name/lv_name/ /var/lib/libvirt/images/image_name.qcow2 If this is the best way to do this, will this keep the information on: /dev/vg_name/lv_name/ untouched? Thanks, and please point me towards another mailing list if this it not right place to ask questions related to qemu-img! Best regards, Richard Taubo *1) Via: http://nocoast-tech.blogspot.com/2010/05/converting-kvm-guests-from-lvm-to-…

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[libvirt-users] Domain XML Multicast Tunnel
by Richard M 03 Dec '19

03 Dec '19

Hello I found under networking in the Domain XML 'Multcast tunnel'. My question is does anyone know what is the intended use of multicast tunnel networking?What are the potential pitfalls of using such a configuration other than what's highlighted in the domain xml. eg: can it suffer from throughput issues? Can the tunnel be accessed from outside Libvirt? I'm struggling to find any information about it. If anyone has any information about it, Or where I can obtain such information it would be appreciated. Regards Richard

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