August 2015 - Users - libvirt List Archives

[libvirt-users] Detaching device behaviour
by Amit Aviram 24 Aug '15

24 Aug '15

Hi all. In libvirt documentation it is written that virDomainDetachDeviceFlags is an asynchronous call: http://libvirt.org/html/libvirt-libvirt-domain.html#virDomainDetachDeviceFl… Does that mean that also virDomainDetachDevice is asynchronous? the reasons mentioned in the above seems relevant for this one as well. Thanks!

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[libvirt-users] Configuration for NATing VMs in a host
by Nacho Otal 24 Aug '15

24 Aug '15

Hi all!, I have a setup in which I want to NAT several Virtual Machines from the host based on ports all of them running CentOS 7.1. The idea is I have several different services running in different VMs and all of them are accessible from the host using different ports that are forwarded to the correct ones in the VMs. I’ve been able to set this up and running configuring the VMs with a virtio network interface and command line redirection on the XML configuration file. However, it is proving to be non stable. Even though VMs are running ok, connection is not possible at some stage until the VM is rebooted and it looks like the port forwarding is not working anymore. I wrote a small script that adds and deletes rules for port forwarding triggered by the qemu hooks and that has brought the needed stability but I’d like to go to a cleaner solution based on firewall-cmd or get rid of it in case it’s possible. On the first draft that I’m using firewall-cmd instead of the iptables rules, it proves to be as unstable as without the qemu hook script. My fear is I’m not configuring libvirt properly. Has anyone experienced such this behaviour and can point me to a better solution?. Thanks for your time, Nacho

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[libvirt-users] Static USB port passthrough is not possible
by Alexander 21 Aug '15

21 Aug '15

Hello, I am currently trying to configure of forwarding devices from specific USB ports which is supported by QEMU. But I don't see any support from libvirt side. Due to libvirt security it occurs to be impossible to passthrough devices from specific bus+port combination. As workaround I may suggest only writing udev rules which use specific script which adds devices to running domains. Unfortunately situation becomes more complicated when I do need to passthrough these devices during system boot -- the special service is required which will handle all these devices after libvirt-guests are up. Does anybody knows how I can do this passthrough without udev workarounds? Thanks. -- Best regards, Alexander Betaev

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[libvirt-users] Windows 10 guest
by Bill Kenworthy 20 Aug '15

20 Aug '15

I am trying to install windows 10 (dreamspark education ISO) into qemu-kvm on Gentoo linux. I got past the cpu problems but am stuck on the image file drivers. The relevant xml is below. It asks for the driver disk which I have, but if I select a driver (either vioscsi or viostor which show as valid it churns away for a few seconds and brings up the cant find driver dialog and cant progress. I've tried both the 102 and 109 RH driver versions (Ive tried most drivers from the ISO's that shows as compatible, usually win8 or 8.1.) Both cdrom xml definitions work fine, but the disk one doesn't and I cant find the magic incantation. <os> <type arch='x86_64' machine='pc-q35-2.4'>hvm</type> </os> <features> <acpi/> <apic/> <hyperv> <relaxed state='on'/> <vapic state='on'/> <spinlocks state='on' retries='8191'/> </hyperv> <kvm> <hidden state='on'/> </kvm> </features> <cpu mode='custom' match='exact'> <model fallback='allow'>core2duo</model> <vendor>Intel</vendor> <topology sockets='1' cores='2' threads='2'/> and <devices> <emulator>/usr/bin/qemu-system-x86_64</emulator> <disk type='file' device='disk'> <driver name='qemu' type='qcow2' cache='none'/> <source file='/mnt/vm/Win10/Win10_disk1.qcow2'/> <target dev='vda' bus='virtio'/> <boot order='2'/> <address type='pci' domain='0x0000' bus='0x02' slot='0x06' function='0x0'/> </disk> <disk type='file' device='cdrom'> <driver name='qemu' type='raw'/> <source file='/mnt/vm/Win10/en_windows_10_education_x64_dvd_6848120.iso'/> <target dev='hda' bus='ide'/> <readonly/> <boot order='1'/> <address type='drive' controller='0' bus='0' target='0' unit='0'/> </disk> <disk type='file' device='cdrom'> <driver name='qemu' type='raw'/> <source file='/mnt/vm/Win10/virtio-win-0.1.102.iso'/> <target dev='hdb' bus='ide'/> <readonly/> <boot order='3'/> <address type='drive' controller='0' bus='1' target='0' unit='0'/> </disk>

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[libvirt-users] Problem after upgrading libvirt to 1.2.9 version on Debian Wheezy
by Fiorenza Meini 19 Aug '15

19 Aug '15

Hi there, I upgraded the package and now I receive this error while trying to start libvirtd. Is there a solution ? BUG: /build/buildd-libnl3_3.2.7-4-amd64-WWfXnH/libnl3-3.2.7/./lib/route/tc.c:970 Regards Fiorenza Meini -- Spazio Web S.r.l. V. Dante, 10 13900 Biella Tel.: +39 015 2431982 Fax.: +39 015 2522600 Numero d'Iscrizione al Registro Imprese presso CCIAA Biella, Cod.Fisc.e P.Iva: 02414430021 Iscriz. REA: BI - 188936 Cap. Soc.: €. 30.000 i.v.

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[libvirt-users] who is the end user of libvirt-iohelper?
by Николай Данашевский 16 Aug '15

16 Aug '15

Hello everybody! I'm trying to make some experiments with writing/reading stream to/from volume. I've realized that libvirt-iohelper are ran to make this operations: 1) reading stream from stdin and writng to a file 2) reading stream from a file and writing to stdout I've also realized that virsh uses libvirt-iohelper via virStorageVolUpload/virStorageVolDownload. But i can't find the place where virsh works with stdin/stdout (reading/writing full data to this I/O).

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[libvirt-users] KVM Storage Pools on LVM
by Phill Edwards 16 Aug '15

16 Aug '15

I have been running some virtual machines on CentOS7 KVM with the VMs living in a folder under a /home directory. Everything I've read says to create LVM volume groups and base storage pools on that. So i followed the instructions at https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/ht… and now have 2 LVM-based storage pools called guest_images_lvm and guest_isos_lvm which are both showing as Active in virt-manager. I now want to move my VMs from /home to the new guest_images_lvm storage pool - but what directory do I copy them to? There doesn't appear to be any directories called guest_images_lvm. I'm not very familiar with LVM - perhaps there is no directory structure? In which case how do I actually move the VMs to the new storage pools? I thought there would be directories under /dev but they're not there. I may have stuffed up the creation of the storage pools as I filled in the Target Path field in virt-manager but left Source Path blank. I found the documentation confusing on this. It creates LVM partitions on /dev/sdb and then says to enter /dev/sdc as the Source Path. is that a mistake? I don't have a /dev/sdc so I ended up leaving this and Build Pool blank. The storage pools got created anyway, but I wonder if this is the source of my problem?

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[libvirt-users] Passing custom ACPI tables
by Wouter Verhelst 14 Aug '15

14 Aug '15

Hi folks, In light of http://blog.sesse.net/blog/tech/2015-08-12-22-19_random_windows_licensing_f… I would like to pass an ACPI table from my host machine to one of my VMs which is managed by libvirt. Does libvirt support adding random ACPI tables to the configuration? If not, is there a way for me to configure custom qemu parameters for a VM? Thanks, -- It is easy to love a country that is famous for chocolate and beer -- Barack Obama, speaking in Brussels, Belgium, 2014-03-26

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[libvirt-users] virsh create snapshot not honoring diskspec?
by Silver Sky Soft Services, Inc. 13 Aug '15

13 Aug '15

Hi, I'm trying to create a snapshot on a specific disk by using diskspec option. However, libvirt/virsh seems to ignore it and takes a snapshot of all disks. Am I using this option incorrectly? In below examples, I'm trying to snapshot only vdb. However even vda is getting snapshotted regardless of diskspec. Is this a known issue? I'm on CentOS 7.1, libvirtd (libvirt) 1.2.8, virsh 1.2.8 [root@localhost scripts]# virsh domblklist centos_nfs Target Source ------------------------------------------------ vda /var/lib/libvirt/images/centos_nfs.SNAP_2015-08-07-081800 vdb /var/lib/libvirt/images/centos_nfs_storage.SNAP_2015-08-07-081800 hdc - [root@localhost scripts]# virsh snapshot-create-as --domain centos_nfs --name SNAP_2015-08-07-090909 --no-metadata --disk-only --atomic --diskspec vdb,snapshot=external Domain snapshot SNAP_2015-08-07-090909 created [root@localhost scripts]# virsh domblklist centos_nfs Target Source ------------------------------------------------ vda /var/lib/libvirt/images/centos_nfs.SNAP_2015-08-07-090909 vdb /var/lib/libvirt/images/centos_nfs_storage.SNAP_2015-08-07-090909 hdc - [root@localhost scripts]# virsh snapshot-create-as --domain centos_nfs --name SNAP_2015-08-07-101010 --no-metadata --disk-only --atomic --diskspec vdb,snapshot=external,file=/var/lib/libvirt/images/centos_nfs_storage.SNAP_2015-08-07-101010 Domain snapshot SNAP_2015-08-07-101010 created [root@localhost scripts]# virsh domblklist centos_nfs Target Source ------------------------------------------------ vda /var/lib/libvirt/images/centos_nfs.SNAP_2015-08-07-101010 vdb /var/lib/libvirt/images/centos_nfs_storage.SNAP_2015-08-07-101010 hdc - Thanks, KiranK

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[libvirt-users] Host and Guest UUID ?
by Jean-Pierre Ribeauville 13 Aug '15

13 Aug '15

Hi, Are there some kind of UUIDs for Host and Guest ? If yes , how may I retrieve them programmatically ? My goal is to trace GUEST migrations. Thx for help. Regards, J.P. Ribeauville P: +33.(0).1.47.17.27.87 Puteaux 3 Etage 5 Bureau 4 jpribeauville(a)axway.com<mailto:jpribeauville@axway.com> http://www.axway.com<http://www.axway.com/> P Pensez à l'environnement avant d'imprimer.

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