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Create VM w/ cache=none on tmpfs
by Miguel Duarte de Mora Barroso 27 Mar '20

27 Mar '20

Hi, I've seen that in the past, libvirt couldn't start VMs when the disk image was stored on a file system that doesn't support direct I/O having the 'cache=none' configuration [0]. On the KubeVirt project, we have some storage tests on a particular provider which does just that - try to create / start a VM whose disk is on tmpfs and whose definition features 'cache=none'. The behavior we're seeing is that libvirt throws this warning: ``` Unexpected Warning event received: testvmig4zsxc2f8swkxv22xkhx2vrb4ppqbfdfgfgqh5gq8plqzrv5,853ff3d9-70d4-43c5-b9ff-4d5815ea557d: server error. command SyncVMI failed: "LibvirtError(Code=1, Domain=10, Message='internal error: process exited while connecting to monitor: 2020-03-25T10:09:21.656238Z qemu-kvm: -drive file=/var/run/kubevirt-ephemeral-disks/disk-data/disk0/disk.qcow2,format=qcow2,if=none,id=drive-ua-disk0,cache=none: file system may not support O_DIRECT\n2020-03-25T10:09:21.656391Z qemu-kvm: -drive file=/var/run/kubevirt-ephemeral-disks/disk-data/disk0/disk.qcow2,format=qcow2,if=none,id=drive-ua-disk0,cache=none: Could not open backing file: Could not open '/var/run/kubevirt-private/vmi-disks/disk0/disk.img': Invalid argument')" ``` But actually proceeds, and is able to start the VM - but seems it coerces the cache value to writeThrough. Is this the expected behavior ? e.g. cache = none can't be used when the disk images are on a tmpfs file system ? I know it was, not sure about now (libvirt-5.6.0-7) ... [0] - https://bugs.launchpad.net/nova/+bug/959637

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Question about local migration between containers
by Or Shoval 26 Mar '20

26 Mar '20

Hello On kubevirt project we are using IpV6 Kind cluster, and trying to support migration, but since both of the containers are on the same host we get this error {"component":"virt-launcher","level":"error","msg":"internal error: Attempt to migrate guest to the same host 32323136-3731-4247-3831-303946353338","pos":"virNetClientProgramDispatchError:172","subcomponent":"libvirt","thread":"44", "timestamp":"2020-03-25T10:41:12.123000Z"} Is there a way to work around this please ? it comes of course from https://github.com/libvirt/libvirt/blob/master/src/qemu/qemu_migration_cook… (not sure what version of libvirt i have but it shows the uuid so i guess this is the one) Thanks

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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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