September 2020 - 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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Problem with xen hvm DomU
by Christoph 08 Jan '21

08 Jan '21

Hi can someone say me whats wrong in this config: <domain type='xen'> <name>fenrir.chao5.int</name> <uuid>7aedcd03-54e8-4055-8d1b-37dd34194859</uuid> <memory unit='KiB'>2097152</memory> <currentMemory unit='KiB'>2097152</currentMemory> <vcpu placement='static'>2</vcpu> <os> <type arch='x86_64' machine='xenfv'>hvm</type> <loader type='rom'>/usr/lib/xen/boot/hvmloader</loader> <kernel>/usr/lib64/xen/boot/hvmloader</kernel> <boot dev='hd'/> </os> <features> <acpi/> <apic/> <pae/> </features> <clock offset='variable' adjustment='0' basis='localtime'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <devices> <disk type='file' device='disk'> <driver name='qemu' type='raw'/> <source file='/dev/vg_astarte/lv_fenrir_root'/> <target dev='hda' bus='ide'/> <address type='drive' controller='0' bus='0' target='0' unit='0'/> </disk> <disk type='file' device='disk'> <driver name='qemu' type='raw'/> <source file='/dev/vg_astarte/lv_fenrir_swap'/> <target dev='hdb' bus='ide'/> <address type='drive' controller='0' bus='0' target='0' unit='1'/> </disk> <controller type='xenbus' index='0'/> <controller type='ide' index='0'/> <interface type='bridge'> <mac address='00:16:3e:05:30:04'/> <source bridge='xenbr5'/> <script path='vif-bridge'/> <model type='netfront'/> </interface> <interface type='bridge'> <mac address='00:16:3e:04:30:04'/> <source bridge='xenbr4'/> <script path='vif-bridge'/> <model type='netfront'/> </interface> <interface type='bridge'> <mac address='00:16:3e:15:30:04'/> <source bridge='xenbr15'/> <script path='vif-bridge'/> <model type='netfront'/> </interface> <interface type='bridge'> <mac address='00:16:3e:14:30:04'/> <source bridge='xenbr14'/> <script path='vif-bridge'/> <model type='netfront'/> </interface> <input type='mouse' bus='ps2'/> <input type='keyboard' bus='ps2'/> <graphics type='vnc' port='6000' autoport='no' listen='0.0.0.0'> <listen type='address' address='0.0.0.0'/> </graphics> <video> <model type='cirrus' vram='8192' heads='1' primary='yes'/> </video> <memballoon model='xen'/> </devices> </domain> If I try to start it with virsh create... then I see only: error: Failed to create domain from /etc/libvirt/libxl/fenrir.chao5.int.xml error: internal error: libxenlight failed to create new domain 'fenrir.chao5.int' ------ Greetz

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Isolated bridge does not bridge
by Paul van der Vlis 04 Jan '21

04 Jan '21

Hello, I want to do some testing and I have removed two VM's from the bridge what connects them to internet, and added them to another isolated bridge what's not connected to internet. Problem is that I cannot reach the other host in the isolated network. Something like this: virsh shutdown kvm66 virsh shutdown kvm68 brctl delif br0 vnet10 vnet6 # the interfaces of kvm66 and kvm68 brctl addbr br1 brctl addif br1 vnet10 vnet6 Then I've replaced br0 to br1 in the XML of both VM's with "virsh edit". Then I did start the VM's using the serial console (no network): virsh start --console kvm66 virsh start --console kvm68 I cannot ping from one machine to the other. Why?? With regards, Paul -- Paul van der Vlis Linux systeembeheer Groningen https://www.vandervlis.nl/

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Set hostname of guest during installation time
by john doe 05 Nov '20

05 Nov '20

Hi, I would like to set the hostname when installing a guest, with the below command the hostname is not set to 'try06' in the guest: virt-install --name=try06 --graphic none --pxe --network bridge=virbr0 How can I set the hostname of the guest during installation time? I realy appriciate the support I'm getting in here, I'm fairly new to libvirt. -- John Doe

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Failed to get udev device for syspath '/sys/devices/virtual/dmi/id'
by Mathieu Tarral 12 Oct '20

12 Oct '20

Hi, I'm facing an issue with libvirt and the LIBXL driver, failing when searching for DMI data in /sys. info : libvirt version: 5.0.0, package: 4+deb10u1 (Guido Günther <agx(a)sigxcpu.org> Thu, 05 Dec 2019 00:22:14 +0100) error : udevGetDMIData:1719 : internal error: Failed to get udev device for syspath '/sys/devices/virtual/dmi/id' or '/sys/class/dmi/id' error : libxlDriverConfigNew:1803 : Unable to configure libxl's memory management parameters error : virStateInitialize:662 : Initialization of LIBXL state driver failed: internal error: Failed to get udev device for syspath '/sys/devices/virtual/dmi/id' or '/sys/class/dmi/id' error : daemonRunStateInit:799 : Driver state initialization failed The relevant function udevGetDMIData in libvirt: https://github.com/libvirt/libvirt/blob/cb09344a2cccc0cc9bcefa3cb53d7af45ba… I don't understand what's happening, as this initialization failure only happens when I boot on the Xen kernel. Also, the /sys/class/dmi* paths are not exposed on Xen. Note: Running on Xen 4.12.1 Any ideas ? Thanks !

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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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cant create network with virt-manager
by Marko Horn 28 Sep '20

28 Sep '20

hello list, i cant create an isolated network with the virt-manager. installed version virt-manager 3.0.0 installed version libvirt 6.2.0 output in error-message: Error creating virtual network: internal error: Failed to apply firewall rules /sbin/iptables -w --table filter --insert LIBVIRT_INP --in-interface virbr3 --protocol tcp --destination-port 67 --jump ACCEPT: iptables: No chain/target/match by that name. Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/asyncjob.py", line 66, in cb_wrapper callback(asyncjob, *args, **kwargs) File "/usr/share/virt-manager/virtManager/createnet.py", line 428, in _async_net_create netobj.create() File "/usr/lib/python3.7/site-packages/libvirt.py", line 3174, in create if ret == -1: raise libvirtError ('virNetworkCreate() failed', net=self) libvirt.libvirtError: internal error: Failed to apply firewall rules /sbin/iptables -w --table filter --insert LIBVIRT_INP --in-interface virbr3 --protocol tcp --destination-port 67 --jump ACCEPT: iptables: No chain/target/match by that name any ideas? thank you marko -- Mitten drin statt nur Datei!

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Help on Meson build Error
by Wei Wang 25 Sep '20

25 Sep '20

Seems it didn't appear on the mailing list, resent it. Hi folks, I'm trying to build libvirt using meson with the latest upstream libvirt, but the compilation fails: (followed on https://libvirt.org/compiling.html, not sure if any dependencies are missed. I checked, src/util/libvirt_util.a.p does not exist.) FAILED: src/util/libvirt_util.a.p/glibcompat.c.o .... In file included from ../src/util/glibcompat.c:19: ./config.h:1026:10: fatal error: config-post.h: No such file or directory FAILED: src/util/libvirt_util.a.p/virfirmware.c.o In file included from ../src/util/virarch.c:22: ./config.h:1026:10: fatal error: config-post.h: No such file or directory FAILED: src/util/libvirt_util.a.p/viraudit.c.o In file included from ../src/util/viraudit.c:22: ./config.h:1026:10: fatal error: config-post.h: No such file or directory Any help is appreciated. Thanks, Wei

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[libvirt] SRIOV configuration
by Edward Haas 24 Sep '20

24 Sep '20

Hello, We encountered a problem while testing SRIOV on kubevirt [1]: We are currently using the Device "hostdev" generic options to pass-through the VF to the guest. It is not done through the "interface" (with type hostdev) because that option requires access to the PF which is not available in our case (the VF is moved to the container namespace where libvirt runs, but not the PF, however libvirt attempts to access the PF and fails). The PCI addresses appearing on the domxml are not the same as the ones mappend/detected in the VM itself. I compared the domxml on the host and the lspci in the VM while the VM runs. This occurs only when SRIOV is defined, messing up also the other "regular" vnics. Somehow, everything comes up and runs (with the SRIOV interface as well) on the first boot (even though the PCI addresses are not in sync), but additional boots cause the VM to mess up the interfaces (not all are detected). This is how the domxml hostdev section looks like: ``` <hostdev mode='subsystem' type='pci' managed='yes'> <driver name='vfio'/> <source> <address domain='0x0000' bus='0x3b' slot='0x0a' function='0x4'/> </source> <alias name='hostdev0'/> <address type='pci' domain='0x0000' bus='0x06' slot='0x01' function='0x0'/> </hostdev> ``` Is there something we are missing or we misconfigured? Tested with 6.0.0-16.fc31 My second question is: Can libvirt avoid accessing the PF (as we do not need mac and other options). 1. https://github.com/kubevirt/kubevirt Thanks, Edy.

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consuming pre-created tap - with multiqueue
by Miguel Duarte de Mora Barroso 24 Sep '20

24 Sep '20

Hello, On KubeVirt, we are trying to pre-create a tap device, then instruct libvirt to consume it (via the type=ethernet , managed='no' attributes). It works as expected, **unless** when we create a multi-queue tap device. The difference when creating the tap device is that we set the multi-queue flag; libvirt throws the following error when consuming it: ``` LibvirtError(Code=38, Domain=0, Message='Unable to create tap device tap0: Invalid argument') ``` After digging a bit on the libvirt code (we're using libvirt 6.0.0), I see this on the logs (immediately before the error): {"component":"virt-launcher","level":"info","msg":"Enabling IFF_VNET_HDR","pos":"virNetDevProbeVnetHdr:190","subcomponent":"libvirt","thread":"33" ,"timestamp":"2020-09-22T10:34:29.335000Z"} I do not understand how it can try to set the VNET_HDR flag, since I have not set it when I created it, which, as per [0] should only happen when requested. Here's the tap device I'm creating: (output of `ip tuntap show`) - tap0: tap persist0x100 user 107 group 107 I'm confused by this, since on [1] it says that only one flag can be used (persist *or* vnet_hdr). Also, from my limited understanding, in order to open a pre-created tap device, it must be set to persistent. Am I right (in the sense that these flags cannot co-exist) ? If so, why would libvirt be setting the VNET_HDR flag on the tap device ? [0] - https://github.com/libvirt/libvirt/blob/v6.0.0/src/util/virnetdevtap.c#L261 [1] - https://github.com/libvirt/libvirt/blob/v6.0.0/src/util/virnetdevtap.c#L209

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