September 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] Add Virtlyst to the list of libvirt users
by Daniel Nicoletti 24 Sep '20

24 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] Add support for vhost-user-scsi-pci/vhost-user-blk-pci
by Li Feng 23 Dec '19

23 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] Internal error reported by libvirt while creating a VM
by Ajay Kumar 01 Oct '19

01 Oct '19

Hi, am Ajay Kumar. I am trying to create a virtual machine on the remote host (where libvirt 5.8.0) was installed using a virtual machine manager which are running on the local ubuntu machine. *The specification of my remote host are:* *Hypervisor: *KVM *QEMU version:* QEMU emulator version 2.4.0.1, Copyright (c) 2003-2008 Fabrice Bellard The below error is propagating when I am trying to install KVM-VMI ( https://github.com/KVM-VMI/kvm-vmi/tree/kvmi) with modified QEMU, and there is a modified QEMU involved, in /usr/local/bin/qemu-system-x86_64. The below particular error propagating when I am trying to create a virtual machine using VMM gui (virt-manager). Unable to complete install: 'internal error: process exited while connecting to monitor: (process:7400): GLib-WARNING **: 18:19:45.044: ../../../../glib/gmem.c:489: custom memory allocation vtable not supported 2019-09-30T18:19:45.046714Z qemu-system-x86_64: -msg timestamp=on: Unsupported machine type Use -machine help to list supported machines!' Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/asyncjob.py", line 89, in cb_wrapper callback(asyncjob, *args, **kwargs) File "/usr/share/virt-manager/virtManager/create.py", line 2553, in _do_async_install guest.start_install(meter=meter) File "/usr/share/virt-manager/virtinst/guest.py", line 498, in start_install doboot, transient) File "/usr/share/virt-manager/virtinst/guest.py", line 434, in _create_guest domain = self.conn.createXML(install_xml or final_xml, 0) File "/usr/lib/python2.7/dist-packages/libvirt.py", line 3603, in createXML if ret is None:raise libvirtError('virDomainCreateXML() failed', conn=self) libvirtError: internal error: process exited while connecting to monitor: (process:7400): GLib-WARNING **: 18:19:45.044: ../../../../glib/gmem.c:489: custom memory allocation vtable not supported 2019-09-30T18:19:45.046714Z qemu-system-x86_64: -msg timestamp=on: Unsupported machine type Use -machine help to list supported machines! -- *With Best Regards:* Ajay

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[libvirt-users] virsh -c lxc:/// setvcpus and <vcpu> configuration fails
by info＠layer7.net 24 Sep '19

24 Sep '19

Hi folks! i created a server with this XML file: <domain type='lxc'> <name>lxctest1</name> <uuid>227bd347-dd1d-4bfd-81e1-01052e91ffe2</uuid> <metadata> <libosinfo:libosinfo xmlns:libosinfo="http://libosinfo.org/xmlns/libvirt/domain/1.0"> <libosinfo:os id="http://centos.org/centos/6.9"/> </libosinfo:libosinfo> </metadata> <memory unit='KiB'>1024000</memory> <currentMemory unit='KiB'>1024000</currentMemory> <vcpu>2</vcpu> <numatune> <memory mode='strict' placement='auto'/> </numatune> <resource> <partition>/machine</partition> </resource> <os> <type arch='x86_64'>exe</type> <init>/sbin/init</init> </os> <idmap> <uid start='0' target='200000' count='65535'/> <gid start='0' target='200000' count='65535'/> </idmap> <features> <privnet/> </features> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/libexec/libvirt_lxc</emulator> <filesystem type='mount' accessmode='mapped'> <source dir='/mnt'/> <target dir='/'/> </filesystem> <interface type='network'> <mac address='00:16:3e:3e:3e:bb'/> <source network='Public Network'/> </interface> <console type='pty'> <target type='lxc' port='0'/> </console> </devices> </domain> I would expect it to have 2 cpu cores and 1 GB RAM. The RAM config works. The CPU config does not: [root@lxctest1 ~]# lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 24 On-line CPU(s) list: 0-23 Thread(s) per core: 2 Core(s) per socket: 6 Socket(s): 2 NUMA node(s): 2 Vendor ID: GenuineIntel CPU family: 6 Model: 62 Model name: Intel(R) Xeon(R) CPU E5-2620 v2 @ 2.10GHz Stepping: 4 CPU MHz: 2399.950 BogoMIPS: 4205.88 Virtualization: VT-x L1d cache: 32K L1i cache: 32K L2 cache: 256K L3 cache: 15360K NUMA node0 CPU(s): 0,2,4,6,8,10,12,14,16,18,20,22 NUMA node1 CPU(s): 1,3,5,7,9,11,13,15,17,19,21,23 It gives me all CPU's from the host. I also tried it with <cpu> <topology sockets='1' cores='2' threads='1'/> </cpu> That didnt help too. I tried to modify the vcpus through virsh: #virsh -c lxc:/// setvcpus lxctest1 2 error: this function is not supported by the connection driver: virDomainSetVcpus Which didnt work too. This happens on: Centos 7 Kernel: 5.1.15-1.el7.elrepo.x86_64 #virsh -V Virsh command line tool of libvirt 4.5.0 See web site at https://libvirt.org/ Compiled with support for: Hypervisors: QEMU/KVM LXC ESX Test Networking: Remote Network Bridging Interface netcf Nwfilter VirtualPort Storage: Dir Disk Filesystem SCSI Multipath iSCSI LVM RBD Gluster ZFS Miscellaneous: Daemon Nodedev SELinux Secrets Debug DTrace Readline and also on Fedora 30 Kernel: 5.2.9-200.fc30.x86_64 # virsh -V Virsh command line tool of libvirt 5.1.0 See web site at https://libvirt.org/ Compiled with support for: Hypervisors: QEMU/KVM LXC LibXL OpenVZ VMware PHYP VirtualBox ESX Hyper-V Test Networking: Remote Network Bridging Interface netcf Nwfilter VirtualPort Storage: Dir Disk Filesystem SCSI Multipath iSCSI LVM RBD Sheepdog Gluster ZFS Miscellaneous: Daemon Nodedev SELinux Secrets Debug DTrace Readline ----------- Can anyone please tell me what i am doing wrong here ? Thank you ! Greetings Oliver

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[libvirt-users] experience with balloon memory ?
by Lentes, Bernd 24 Sep '19

24 Sep '19

Hi ML, i'm thinking about using balloon memory for our domains. We have about 15 domains running concurrently, and i think it might be nice if a domain requires more RAM it grabs it, and if it don't need it anymore, it releases it. But i have no experience with it. So i have some questions: - is live migration possible with balloon ? - is it stable ? - the domain needs an appropriate driver i think ? - are there drivers for Windows 7 and 10 ? - are there drivers for Linux, which kernel version do i need ? - does someone have experience with it ? Is there a kind of "best practise" ? Thanks. Bernd -- Bernd Lentes Systemadministration Institut für Entwicklungsgenetik Gebäude 35.34 - Raum 208 HelmholtzZentrum münchen bernd.lentes(a)helmholtz-muenchen.de phone: +49 89 3187 1241 phone: +49 89 3187 3827 fax: +49 89 3187 2294 http://www.helmholtz-muenchen.de/idg Perfekt ist wer keine Fehler macht Also sind Tote perfekt Helmholtz Zentrum Muenchen Deutsches Forschungszentrum fuer Gesundheit und Umwelt (GmbH) Ingolstaedter Landstr. 1 85764 Neuherberg www.helmholtz-muenchen.de Aufsichtsratsvorsitzende: MinDir'in Prof. Dr. Veronika von Messling Geschaeftsfuehrung: Prof. Dr. med. Dr. h.c. Matthias Tschoep, Kerstin Guenther Registergericht: Amtsgericht Muenchen HRB 6466 USt-IdNr: DE 129521671

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[libvirt-users] Privacy Extension not working in VM
by Thomas Luening 24 Sep '19

24 Sep '19

Hello @ all With the rebuilding of my Server from Debian 9 to Debian 10, I also switch from Virtual Box to Libvirt/KVM. Due to new requirements for the VMs, now I have an actual problem, which unfortunately I can not solve. The problem has already been discussed in the German Debian-Forum ... unfortunately also without success. The facts: - ISP = Dual Stack with daily separation - Host and VM = Debian 10 - The VMs are via macvtap-device regular LAN-Clients - IPv4 = DHCP and NAT by DSL-Router - IPv6 = GUA via RA and SLAAC (2003::/3) - IPv4 works fine in the VM - IPv6 (NDP, RA, SLAAC) works basically also fine in the VM The existing problem in the VM: - MAC-Based GUA (2000::/3) is ok, both inbound and outbound - Outbound traffic via the second GUA (PE-Based) is filtered apparently, but not via packetfiltering, I don't know where. There are no error messages. On the part of the kernel in the VM and the IPv6-stack, everything looks completely ok, no error messages, except that Outbound-Traffic by the PE-Address is quietly blocked. The MAC- Based IPv6 works unchanged and without error as before. My questions: 1. Is there a special setting for the VM, to allow the use of Privacy Extensions for IPv6 unlimited? 2. Or is that possibly even a known and at the moment unsolved problem? 3. Or is this a intended limitation of virtualization? Can anyone help me with a solution or a hint? Thank you. BR, Tom

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[libvirt-users] Certificate checking on TLS migrations to an IP address
by Milan Zamazal 23 Sep '19

23 Sep '19

Hi, I'm trying to add TLS migrations to oVirt, but I've hit a problem with certificate checking. oVirt uses the destination host IP address, rather than the host name, in the migration URI passed to virDomainMigrateToURI3. One reason for doing that is that a separate migration network may be used for migrations, while the host name resolves to the management network interface. But it causes a problem with certificate checking. The destination IP address is checked against the name, which is a host name, given in the destination certificate. That means there is mismatch and the migration fails. I don't think it'd be a very good idea to avoid the problem by putting IP addresses into server certificates. Is there any way to make TLS migrations working under these circumstances? For instance, SPICE remote-viewer allows the client to specify the certificate subject to expect on the host when connecting to it using an IP address. Can (or could) libvirt do something similar? Or is there any other mechanism to handle this problem? Thanks, Milan

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[libvirt-users] VM cloning with memory state
by Benny Zlotnik 23 Sep '19

23 Sep '19

Hi, We are trying to implement VM cloning with snapshots for ovirt. For the most part, everything seems to work fine. However, when saved-state comes into play it gets complicated. As it seems impossible to restore a saved state file for a different VM due to a mismatch in UUID and name, I was wondering if it is possible to somehow work around this? Is it a sensible thing to do? (these are essentially the same VMs in terms of configuration and disk content) Is there a better approach to cloning a VM entirely (with snapshots and memory)? Thanks!

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[libvirt-users] Live-Migration not possible: error: operation failed: guest CPU doesn't match specification
by Lentes, Bernd 19 Sep '19

19 Sep '19

Hi, i have atwo node HA-cluster with pacemaker, corosync, libvirt and KVM. Recently i configured a new VirtualDomain which runs fine, but live Migration does not succeed. This is the error: VirtualDomain(vm_snipanalysis)[14322]: 2019/09/18_16:56:54 ERROR: snipanalysis: live migration to ha-idg-2 failed: 1 Sep 18 16:56:54 [6970] ha-idg-1 lrmd: notice: operation_finished: vm_snipanalysis_migrate_to_0:14322:stderr [ error: operation failed: guest CPU doesn't match specification: missing features: fma,movbe,xsave,avx,f16c,rdrand,fsgsbase,bmi1,avx2,smep,bmi2,erms,invpcid,md-clear,xsaveopt,abm ] The two servers are from HP, they are similar, but not identical. Their CPU's are different: One is "Intel(R) Xeon(R) CPU E5-2630 v3 @ 2.40GHz", following /proc/cpuinfo, the other is "Intel(R) Xeon(R) CPU X5675 @ 3.07GHz". Which guest CPU should i choose for having the guest running smoothly on each host ? Bernd -- Bernd Lentes Systemadministration Institut für Entwicklungsgenetik Gebäude 35.34 - Raum 208 HelmholtzZentrum münchen bernd.lentes(a)helmholtz-muenchen.de phone: +49 89 3187 1241 phone: +49 89 3187 3827 fax: +49 89 3187 2294 http://www.helmholtz-muenchen.de/idg Perfekt ist wer keine Fehler macht Also sind Tote perfekt Helmholtz Zentrum Muenchen Deutsches Forschungszentrum fuer Gesundheit und Umwelt (GmbH) Ingolstaedter Landstr. 1 85764 Neuherberg www.helmholtz-muenchen.de Aufsichtsratsvorsitzende: MinDir'in Prof. Dr. Veronika von Messling Geschaeftsfuehrung: Prof. Dr. med. Dr. h.c. Matthias Tschoep, Kerstin Guenther Registergericht: Amtsgericht Muenchen HRB 6466 USt-IdNr: DE 129521671

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[libvirt-users] About vhost-user-blk support
by Su Hua 12 Sep '19

12 Sep '19

Hi, everyone, ask a question, which version can fully support the device type of qemu hw/block/vhost-user-blk.c? If so, what should the format of the xml file look like? Regards Su

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[libvirt-users] Disk backup for live and offline domains
by Tim Schumacher 11 Sep '19

11 Sep '19

Hi, I followed the instructions on the wiki https://wiki.libvirt.org/page/Live-disk-backup-with-active-blockcommit for a live disk backup. Unfortunately this is not working when the domain is offline because the active blockcommit throws error: Requested operation is not valid: domain is not running For my use case it should be possible for the domain to shut down while the backup is in progress. I'm looking for a way to shorten the backing chain after the backup finishes and the domain is offline. Is there a way to let libvirt decide wether to shorten the backing chain using blockcommit or some alternative way which works on offline domains? As I'm writing this I might as well ask about the current state of "incremental backups". It seems like dirty bitmaps can keep track of which blocks changed and just copy those to the backup. Is there some libvirt command-line frontend for that or is it planned for the future? Thanks. - Tim

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[libvirt-users] Disk backup for live and offline domains
by Tim Schumacher 11 Sep '19

11 Sep '19

Hi, I followed the instructions on the wiki https://wiki.libvirt.org/page/Live-disk-backup-with-active-blockcommit for a live disk backup. Unfortunately this is not working when the domain is offline because the active blockcommit throws error: Requested operation is not valid: domain is not running For my use case it should be possible for the domain to shut down while the backup is in progress. I'm looking for a way to shorten the backing chain after the backup finishes and the domain is offline. Is there a way to let libvirt decide wether to shorten the backing chain using blockcommit or some alternative way which works on offline domains? As I'm writing this I might as well ask about the current state of "incremental backups". It seems like dirty bitmaps can keep track of which blocks changed and just copy those to the backup. Is there some libvirt command-line frontend for that or is it planned for the future? Thanks. - Tim

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[libvirt-users] Reg: <operation not permitted><netlink socket><Qemu device>
by bharath paulraj 09 Sep '19

09 Sep '19

Hi Team, I am writing a new device in QEMU, which opens and reads from Netlink socket from the hypervisor. I need this Netlink socket to support migration of connection tracking entries during VM Live migration. If I am using QEMU command directly to launch the VM, then any operation on Netlink socket works fine. But, If I am using libvirt to create the VM and attaching the device, then I am getting permission denied error. As I found out that this is related to SElinux, I added the svirt_t context as permissive *"semanage permissive -a svirt_t". *With this, I am not receiving permission denied error, instead i am receiving "operation not permitted" error. I changed the user and group field in libvirtd/qemu.conf to root/root. But still, I am facing the same problem. Any suggestions to overcome this? -- Regards, Bharath

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[libvirt-users] Recover snapshots from qcow images
by Petr Stodulka 06 Sep '19

06 Sep '19

Hi guys, I had to move to the new laptop week ago and I screw migration of my virtual machines. I recovered my virtual machines on the new laptop (virsh define) using the backed up xml files, but I am missing any file with metadata about snapshots. The original storage is cleaned so I cannot take these files anymore. Using qemu-info I can see my snapshots inside the qcow images, but libvirt doesn't know about them: ########################################### # virsh snapshot-list rhlvm Name Creation Time State ------------------------------- # qemu-img info rhlvm.qcow2 image: rhlvm.qcow2 file format: qcow2 virtual size: 25G (26843545600 bytes) disk size: 2.9G cluster_size: 65536 Snapshot list: ID TAG VM SIZE DATE VM CLOCK 1 prepared 0 2018-09-05 11:06:06 00:00:00.000 Format specific information: compat: 1.1 lazy refcounts: true refcount bits: 16 corrupt: false ########################################### Is there any nice way to regenerate snapshot metadata for libvirt from the data inside qcow images? I have bunch of VMs so if there is nice way how to recover those data, you will make me really happy :) Thanks, -- Petr Stodulka OS & Application Modernization IRC nicks: pstodulk, skytak Software Engineer Red Hat Czech s.r.o.

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[libvirt-users] KVM NAT stops from working
by Francesc Guasch 04 Sep '19

04 Sep '19

Hi. First of all thank you for the work you are doing with libvirt. I am not sure this is the right place to ask, I'd appreciate if you can give me any hint or directions. I have several similar KVM Linux boxes and one of them has a really strange behavior with the KVM NAT: It just suddenly stops from working. This is a Linux Ubuntu Server 19.04 with - libvirt-bin 4.0.0 - qemu-kvm 1:2.11 Everything works fine and then suddenly the virtual machines can't reach outside. If I run a tcpdump in the host I see the NAT isn't working. When the server just boots I can see the packets with the server address going out: x.y.z.w.49138 > 8.8.8.8.53 Then, it may be some hours or days later, instead the server address I see the internal domains address: 192.168.122.33.19132 > 8.8.8.8.53 ^^^^^^^^^^^^^^ I try to restart the iptables but it won't help. Any hints ? Thank you very much

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