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[libvirt-users] how libvirt create virbr0
by 露露 25 Jul '17

25 Jul '17

libvirt version: 3.4.0 architecture: x86_64 ubuntu16.04-server hypervisor: kvm,qemu when install libvirt from ubuntu distribution deb install libvirt, a virtual bridge virbr0 will be create . But when I build libvirt from souce code, how can I create a virbr0. If I want create another virtual bridge ,How can I create and start the virtual bridge. Thanks

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[libvirt-users] transient configure turn to persistent configure
by 露露 25 Jul '17

25 Jul '17

libvirt version: 3.4.0 architecture: x86_64 ubuntu16.04-server hypervisor: kvm,qemu I call virDomainCreate create a transient vm, After a period of time ,I call virDomainDestroy, the vm configure is stil exist， the vm turn to persistent, I don't known the reason. Thanks

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[libvirt-users] memory snapshot save error
by 露露 25 Jul '17

25 Jul '17

libvirt version: 3.4.0 architecture: x86_64 ubuntu16.04-server hypervisor: kvm,qemu when I want make a memery snapshot for a vm ,and I call virsh save ,but tell me this error: error: Failed to save domain 177 to /datapool/mm.img error: operation failed: domain save job: unexpectedly failed xml configure: <domain type='kvm' id='177'> <name>virt23</name> <uuid>e50c1d59-c4a3-4413-b6c9-20e90cced343</uuid> <metadata/> <memory unit='KiB'>10485760</memory> <currentMemory unit='KiB'>10485760</currentMemory> <vcpu placement='static'>1</vcpu> <resource> <partition>/machine</partition> </resource> <os> <type arch='x86_64' machine='pc-i440fx-2.5'>hvm</type> <boot dev='hd'/> </os> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/bin/kvm</emulator> <disk type='file' device='disk'> <driver name='qemu' type='raw'/> <source file='/datapool/zhuohf/virt23.qcow2'/> <backingStore/> <target dev='vdc' bus='virtio'/> <alias name='virtio-disk2'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </disk> <disk type='file' device='cdrom'> <driver name='qemu' type='raw'/> <source file='/datapool/zhuohf/ubuntu-16.04.2-desktop-amd64.iso'/> [40/38156] <backingStore/> <target dev='hdc' bus='ide'/> <readonly/> <alias name='ide0-1-0'/> <address type='drive' controller='0' bus='1' target='0' unit='0'/> </disk> <controller type='usb' index='0' model='piix3-uhci'> <alias name='usb'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/> </controller> <controller type='pci' index='0' model='pci-root'> <alias name='pci.0'/> </controller> <controller type='ide' index='0'> <alias name='ide'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> </controller> <interface type='network'> <mac address='52:54:00:e0:31:68'/> <source network='default' bridge='virbr0'/> <target dev='vnet11'/> <model type='rtl8139'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> <input type='mouse' bus='ps2'> <alias name='input0'/> </input> <input type='keyboard' bus='ps2'> <alias name='input1'/> </input> <graphics type='vnc' port='5909' autoport='yes' listen='0.0.0.0'> <listen type='address' address='0.0.0.0'/> </graphics> <video> <model type='cirrus' vram='16384' heads='1' primary='yes'/> <alias name='video0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> <memballoon model='virtio'> <stats period='1'/> <alias name='balloon0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </memballoon> </devices> <seclabel type='none' model='none'/> <seclabel type='dynamic' model='dac' relabel='yes'> <label>+0:+0</label> <imagelabel>+0:+0</imagelabel> </seclabel> </domain> before I encounter the same error,that time is my disk not free space，but this time I can't find error reason. Thanks

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[libvirt-users] cannot set maxMemory
by 임영빈 21 Jul '17

21 Jul '17

Hi all, I'm testing the memory hotplugging on devstack (ocata version). According to the article in https://medium.com/@juergen_thomann/memory-hotplug-with-qemu-kvm-and-libvir… , I'm trying to create a virtual machine by setting <maxMemory>. However, I've got an error message in libvirt log as below. 2017-07-20 20:33:21.175+0000: 529: error : virDomainDefCheckUnsupportedMemoryHotplug:1192 : unsupported configuration: memory hotplug tunables <maxMemory> are not supported by this hypervisor driver virt-aa-helper: error: could not parse XML virt-aa-helper: error: could not get VM definition I'm using qemu hypervisor (2.8), and libvirt (2.5.0). As I know, these qemu, libvirt versions support hotplugging memory. Below is the xml file I used to create a virtual machine by using 'virsh create test.xml' command. <domain type='qemu'> <name>QEmu-fedora-i686</name> <uuid>c7a5fdbd-cdaf-9455-926a-d65c16db1809</uuid> <maxMemory slots='4' unit='KiB'>2097152</maxMemory> <memory>219200</memory> <currentMemory>219200</currentMemory> <vcpu>2</vcpu> <cpu> <numa> <cell id="0" cpus="0" memory="2097152" unit="KiB"/> </numa> </cpu> <driver name="qemu" type="qcow2" cache="none"/> <os> <type arch='i686' machine='pc'>hvm</type> <boot dev='cdrom'/> </os> <devices> <emulator>/usr/bin/qemu-system-ppc</emulator> <disk type='file' device='cdrom'> <source file='/home/user/boot.iso'/> <target dev='hdc'/> <readonly/> </disk> <disk type='file' device='disk'> <source file='/home/user/fedora.img'/> <target dev='hda'/> </disk> <interface type='network'> <source network='default'/> </interface> </devices> </domain> Does anyone know the reason? Thanks, Youngbin

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[libvirt-users] SSH from host to domain using hostname
by c.monty＠web.de 20 Jul '17

20 Jul '17

Hello! I want to SSH from host to specific guest using hostname, e.g. ssh <user>@<guest> or ssh test@vm02-fai ssh to guest using IP works w/o issues. I found Wiki article for "NSS module" (http://wiki.libvirt.org/page/NSS_module) but there are no results for the following commands: ld4004:/home # virsh net-dhcp-leases default Expiry Time MAC address Protocol IP address Hostname Client ID or DUID ------------------------------------------------------------------------------------------------------------------- ld4004:/home # virsh domifaddr --source lease vm02-fai Name MAC address Protocol Address ------------------------------------------------------------------------------- ld4004:/home # virsh list Id Name State ---------------------------------------------------- 1 vm02-fai running dnsmasq is running: ld4004:/home # netstat -nulpd | grep dnsmasq udp 0 0 192.168.33.1:53 0.0.0.0:* 10318/dnsmasq udp 0 0 192.168.100.1:53 0.0.0.0:* 20145/dnsmasq udp 0 0 0.0.0.0:67 0.0.0.0:* 20145/dnsmasq How can I fix this issue? THX

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[libvirt-users] libvirt administration tools
by Dominik Psenner 20 Jul '17

20 Jul '17

Hi! To give something back to the community I just now made our daily live backup scripts open source. It is hosted on github and licensed under the Apache-2.0. https://github.com/dpsenner/libvirt-administration-tools Feel free to use it in your production environment or fork and adapt it to fit your needs or even improve it and open pull requests! Cheers -- Dominik Psenner

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[libvirt-users] What may be cause vm "in shutdown" state
by ahongloumeng＠163.com 20 Jul '17

20 Jul '17

Hello， We meet a question about vm state. System environment: linux version: centos 6.8 libvirt version: 3.4.0 qemu version: 2.4.1 When shutdown one of vms, the state of the vm stuck in in shutdown state. And the qemu process is gone. Look up the vm log /var/log/libvirt/qemu/vm.log: "qemu: terminating on signal 15 from pid 54601 2017-07-19 04:41:09.960+0000: shutting down, reason=crashed" What may be cause vm "in shutdown" state Thanks! ahongloumeng(a)163.com

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[libvirt-users] Way to detect virtual machine cpu features
by Lei Zhang 19 Jul '17

19 Jul '17

Hello everyone I want to know how can I use libvirt to detect what cpu features a virtual machine will see. I guess I could do it in following way: 1. if cpu mode is 'custom', use 'virsh cpu-baseline --features' on the cpu model to get model features. 2. if cpu mode is 'host-passthrough' or 'host-model', do a 'virsh capabilities' to list cpu features of physical host, they are identical to features of virtual machine. Is this right way to do things? Look forward to your valuable comments. Best regards, Lei

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Re: [libvirt-users] [Qemu-devel] [PATCH v2] hmp: allow cpu index for "info lapic"
by Igor Mammedov 19 Jul '17

19 Jul '17

On Wed, 19 Jul 2017 16:48:23 +0800 (CST) <wang.yi59(a)zte.com.cn> wrote: > >* wang.yi59(a)zte.com.cn (wang.yi59(a)zte.com.cn) wrote: > > > >> Hi Eduardo, > > >> > > >> Thank you for your reply! > > >> > > >> >On Mon, Jul 17, 2017 at 09:49:37PM -0400, Yi Wang wrote: > > >> > > >> >> Add [vcpu] index support for hmp command "info lapic", which is > > >> > > >> >> useful when debugging ipi and so on. Current behavior is not > > >> > > >> >> changed when the parameter isn't specified. > > >> > > >> >> > > >> > > >> >> Signed-off-by: Yi Wang <wang.yi59(a)zte.com.cn> > > >> > > >> >> Signed-off-by: Yun Liu <liu.yunh(a)zte.com.cn> > > >> > > >> > > > >> > > >> >We have 8 monitor commands (see below) that use the CPU set by > > >> >the "cpu" command (mon_get_cpu()) as input. Why is "info lapic" > > >> >special? > > >> > > >> When we debugging a problem of ipi, we wanted to verify lapic info > > >> on each vCPU, but we found that we could only get vCPU 0's lapic > > >> through "info lapic", so we supposed this patch could help those > > >> who have the same problem as us. > > > > > >I think Eduardo's point is that you can already do: > > > cpu 0 > > > info lapic > > > cpu 1 > > > info lapic > > Yes, I get it, thank you. > > The reason of the problem we met is that we use "virsh qemu-monitor-command", > > so the 'cpu' command didn't work. you can try to use qmp interface directly which supports specifying cpu for monitor commands: qemu supports: -- Command: human-monitor-command Execute a command on the human monitor and return the output. Arguments: 'command-line: string' the command to execute in the human monitor 'cpu-index: int' (optional) The CPU to use for commands that require an implicit CPU maybe "virsh qemu-monitor-command" can also do it, CCing libvirt list > > > > > > > > > --- > > Best wishes > > Yi Wang

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[libvirt-users] Hot-migration of OVS Vlan configuration
by Antoine Millet 13 Jul '17

13 Jul '17

Hi list, I'm using OVS as backend for guest networking on my hypervisors. VLAN configuration for each interface is specified into the guest XML definition. When I need to change VLAN configuration of a running guest, I first edit the inactive XML to keep the changes for future boots, then I use ovs-vsctl to instruct the changes on the existing OVS Port. The problem happen when the guest is migrated to another hypervisor. The "active" XML is used to instantiate the VM on the destination and this XML doesn't incorporate the changes made to the inactive one. All the changes made on source are lost on the running guest at destination. I'm looking for a solution to this problem: - IFAIK, I cannot edit the "active" XML myself other than by using provided Libvirt API (like attach-device), and such API doesn't exists for VLANs modification on OVS interface - I cannot use a migration hook to pass changes made to the inactive XML into the active one because the inactive XML is not reachable from the hook - I found a patch allowing to transport some information attached to an OVS port during migration[1]. Unfortunately, this patch doesn't transport the VLAN configuration - Modification of the active XML during the migration itself is not desirable because it will complicate the migration process by requesting an external tool Did I miss something to achieve VLAN configuration migration? How to implement that into the Libvirt properly? Thanks! Antoine [1] https://www.redhat.com/archives/libvir-list/2012-September/msg01092 .html

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