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protocol method available on Windows
by john doe 26 Mar '20

26 Mar '20

Hi libvirts, I'm playing with libvirt on Windows (downloaded the x64 msi) but I'm stuck at the following: virsh # net-edit default error: failed to connect to the hypervisor error: invalid argument: transport methods unix, ssh and ext are not supported under Windows Can someone shed some light on what transport method I should use? Any help is appriciated. P.S. I'm not subscribed to the list. -- John Doe

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libvirt dynamic file ownership
by Joe Muro 25 Mar '20

25 Mar '20

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how can i get enough mem stat detai from win7 vm with virtio-win driver install and blnsrv started ?
by thomas.kuang 24 Mar '20

24 Mar '20

hi，every one I have some trouble with the virsh to get vm mem-usage in guest os. [root@localhost ~]# virsh list --all Id Name State 1 wwl_centos7_1708 running 2 windows-virtio-template running I create two vms one guest os is centos, the other is window 7 virsh dommemstat wwl_centos7_1708 actual 4194304 swap_in 0 swap_out 0 major_fault 194 minor_fault 219454 unused 3729588 available 3881812 last_update 1581406529 rss 2969400 so i can get the vm mem-used detail, but if my guest os is windows, though I install virtio-win driver and run blnsrv.exe -i start the service, I fail to get not enough vm mem stat info, as following: virsh dommemstat windows-virtio-template actual 8388608 last_update 1584947706 rss 8263664 can anyone tell me how can I succ to get window's vm with enough mem stat info the same with centos ? thanks u !

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Fwd: KVM hook
by Aditya Sahu 21 Mar '20

21 Mar '20

Hi Team , I am reaching out to you seeking your help for one of my KVM hook script. I am using /etc/libvirt/hooks/network file to trigger an event when a network is created or deleted ( https://www.libvirt.org/hooks.html ). Basically I using a rest call to create the same network in my Infoblox appliance for the network monitoring. However every time I create a network only $2== start or $2==started gets invoked, i have tried pretty much every combination and permutation but did not get any success. I checked the libvirtd.log and found that only $2== start or $2==started gets invoked. In my case i would like to get network created in infoblox appliance as and when it gets created in the KVM and should get deleted as and when it gets deleted from the KVM. Here is snippet of my script #!/bin/bash network_name=`xml_grep --text_only hookData/network/name /etc/libvirt/hooks/net_details` network=`xmllint --xpath hookData/network/ip/@address /etc/libvirt/hooks/net_details|cut -d "=" -f2|tr -d '"'` network_mask=`ipcalc $network |awk '/Network/{print$2}'` if [[ $2=="begin" ]] || [[ $2=="start" ]] || [[ $2=="started" ]]; then curl -k -u admin:infoblox -H "content-type: application/json" -X POST " https://10.196.200.63/wapi/v2.10/network?_return_fields%2B=network&_return_…" -d '{"network": "'$network_mask'"}' network_ref=`curl -k -s -u admin:infoblox -H 'content-type: application/json' -X GET ' https://10.196.200.63/wapi/v2.10/network?_return_fields%2B=network&_return_… '| grep $network_mask| awk -v RS=" " '/_ref/{getline;print$1}' |cut -d "/" -f2-3` else curl -k -u admin:infoblox -H 'content-type: application/json' -X DELETE "https://10.196.200.63/wapi/v2.10/network/$network_ref/default" fi ----------------------------------------------------------------------------------------------------------------------- This script works perfectly fine and creates the network however when i delete the network it does not get deleted from the infoblox appliance. As i mentioned when tailed the libvirtd.log I found that the API to create network gets executed when the network is stopped. Attaching libvirted.log snippet [image: image.png] In this screen shot, stopped hook is triggered but still network creation API is fired which has errored out. Any guidance or help is highly appreciated. -Aditya

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Google Summer of Code - Redfish API implementation
by GUOQING LI 20 Mar '20

20 Mar '20

Hi libvirt crews I am a 4th year Software Engineering student from ChiangMai University, Thailand. Currently, I am doing a research internship at nara institute of science and technology, Japan. I have been working on a research that is related to the performance and security characteristics of various container technologies like Linux containers, gVisor , firecracker, kanta etc. It is supposed to be finished by the middle of next April. I am hoping to get involved with libvirt opensource project before I start my master program in October. I am interested in the Redfish API implementation project suggested by Cédric Bosdonnat. It's a nice modern RESTFUL JSON API which should not be very challenging to work with Python. It seems like There is already a Redfish API client <https://pythonhosted.org/python-redfish/readme.html> written in Python, Do you think it would be a good idea to use it to test the API on server side as i implemented through it ? It would be great If I can get in touch with Cédric Bosdonnat and have further discussion. Any suggestions about the project proposal would be much appreciated. Best regards,🙂 Lee <https://www.dmtf.org/sites/default/files/standards/documents/DSP0266_1.9.0.…>

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Problems with libvirt for MIPS
by Computers Issues 19 Mar '20

19 Mar '20

Hello. It's my first time here, so I'm so sorry if I make mistakes with how I'm sending or posting this. I wanted to ask about some problems I've found with other people, working with libvirt. We wanted to create a new virtual machine under MIPS architecture, using Qemu and libvirt. We are able to create the machine, and it boots, but never gets an IP. I'll leave the commands we've used, for the case someone knows what could be wrong. Qemu commands: libvirt+ 41690 25.0 11.5 837532 147992 ? Sl 14:15 0:04 /usr/bin/qemu-system-mips -name guest=MIPS_32,debug-threads=on -S -object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-137-MIPS_32/master-key.aes -machine malta,accel=tcg,usb=off,dump-guest-core=off -m 256 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid eef94af7-4f20-4a00-9ae9-9b4133c1783b -display none -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-137-MIPS_32/monitor.sock,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -boot strict=on -kernel ~/vmlinux -append root=/dev/hda -device piix3-usb-uhci,id=usb,bus=pci,addr=0x2 -drive file=~/rootfs.ext2,format=raw,if=none,id=drive-ide0-0-0 -device ide-hd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1 -netdev tap,fd=26,id=hostnet0 -device pcnet,netdev=hostnet0,id=net0,mac=52:54:00:09:a4:38,bus=pci,addr=0x1 -device virtio-balloon-pci,id=balloon0,bus=pci,addr=0x3 -device pcnet -netdev user,id=net1 -msg timestamp=on Thanks anyway!!!

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pointer to "spice" device by virNodeDeviceLookupByName
by Андрей Фокин 18 Mar '20

18 Mar '20

Is possible to get a pointer to «spice» by virNodeDeviceLookupByName API? What «name» I should use for? Thanks a lot! -- Андрей Фокин

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live storage migration using blockcopy
by Jing-Wei Su 16 Mar '20

16 Mar '20

Hello, I'm seeking the solution to live storage migration using blockcopy. Previously, the "virsh undefine" is required before blockcopy. https://www.redhat.com/archives/libvirt-users/2015-October/msg00027.html QEMU has "block-dirty-bitmap-*" operations now, are there steps for the live storage migration using blockcopy without undefine? By the way, why's the purpose of "undefine" before blockcopy? Thanks. Sincerely, Jing-Wei

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changing memory size with virsh setmem - results only visible in domain, not on host
by Lentes, Bernd 07 Mar '20

07 Mar '20

Hi, i have a Linux domain (Ubuntu 14.04) where we like to be able to change the amount of usable memory. We have a balloon device and statistics are switched in 5 sec. rhythm. The domain shows very quickly changes (following top) when we change the memory size with setmem, but the host does not show changes in the use of memory for the respective domain. Is that expected behavior ? Host is SLES 12 SP4, libvirt is 4.0.0-8.15.2 Bernd -- Bernd Lentes Systemadministration Institute for Metabolism and Cell Death (MCD) Building 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/mcd Perfekt ist wer keine Fehler macht Also sind Tote perfekt Helmholtz Zentrum MÃ¼nchen 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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KVM on CentOS 7 - sluggish performance with Win10 Guest
by Benjammin2068 06 Mar '20

06 Mar '20

Hey all, I've been running a Win10 Pro (64bit) guest for some time now.... and originally it was pretty snappy and I had no complaints. Somewhere in about the last 3-6 months I've been noticing sluggish performance -- but not overall. The system is mostly remote so I do a lot of my admin via RDP or the local console with the KVM Manager. I recently did a complete fresh install of Win10 Pro (1909. Previous install was 1607) and both show the same problem. The ONLY real thing running on this VM is Milestone's surveillance system (standalone host). Where I see the "sluggish" is: Connecting to milestone mobile server (either through web browser or client). for the small number of cameras, the connection spool up takes like 15 seconds which is noticeably longer than other systems I have set up with more load/tasks in terms of cameras. This used to be speedy and fine. The other place I see sluggish operation is on the desktop doing some typical tasks and seeing "not responding" in the window of the task that goes away - but should it ever appear to begin with? The system is a Supermicro motherboard with Dual Intel(R) Xeon(R) CPU E5-2640 v4 @ 2.40GHz w/64GB The Guest is provided with 20 cores in a config of 1 CPU, 10 cores - 2 threads per core. There are dedicated NICs (dual NIC card) attached to the system via macvtap (and are not used by CentOS in any way except to pass through to this Guest) I'm using QCOW2 for the base OS. The storage volume for video are raw devices. Once a process is running, performance seems fine... it seems to be starting processes or something. I'm not sure -- and I'm not as intimate with KVM/libvirt as I'd like to be yet. So I'm wondering if there's any performance tweaks I should know about. I've read about using .img vs .qcow2 already. I'm using virt-io drivers to some extent.... but is there anything else I'm missing? Thanks in advance, -Ben

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