June 2014 - Users - libvirt List Archives

[libvirt-users] data monitored by "virDomainBlockStats" API not consistent with ones reading from /proc/[pid]/io, and corrugated with /proc/diskstats
by coperd 26 Jun '14

26 Jun '14

Hi, all. While monitoring KVM VMs’ disk utilisation using libvirt API “virDomainBlockStats", I find that the results acquired is not consistent with the value read from /proc/[vm_pid]/io(i only care about “rd_bytes" and “wr_bytes” fields). Since libvirt doesn’t support host level monitoring, i have to calculate the host’s disk utilisation by reading from the /proc/diskstats file. What’s worse, the individual VM’s disk data may be greater that the physical disk’s total value during some sampling time. It is supposed that the VM’s disk “rd_bytes" and “wr_bytes" should never exceed the value of the physical disk respectively, right ? Doesn’t libvirt virDomainBlockStats read disk information from “proc” ? I want to calculate VM’s bandwidth, here is my way: Firstly, we can get total disk utilisation using tools like iostat("iostat -x”, the %util field represent the disk’s utilisation percentage) Then, given a sampling time period, 10s for example, i collected total bytes read/written by each VM by virDomainBlockStats and total bytes of the physical disk by /proc/diskstats, then delta(VM’s rd+wr bytes)/delta(physical disk’s rd+wr bytes) * %util is the VM’s disk utilization percentage during this time period. Since the appearance of the above situation, i can’t get correct result. I have search a lot for this question, but no answers. Any help would be appreciated.

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[libvirt-users] qemu-bridge-helper issue
by abhishek jain 25 Jun '14

25 Jun '14

Hi I'm able to run the below command using root permission.... sudo kvm -netdev bridge,br=qbr0ccdca50-fa,id=hostnet -M ppce500 Warning: netdev hostnet has no peer Could not initialize SDL(No available video device) - exiting However when I'm running the same command without root authority,I'm getting following logs... kvm -netdev bridge,br=qbr0ccdca50-fa,id=hostnet -M ppce500 failed to create tun device: Operation not permitted failed to launch bridge helper kvm: -netdev bridge,br=qbr0ccdca50-fa,id=hostnet: Device 'bridge' could not be initialized I need to run the above command without root authority.Please help regarding this. Thanks Abhishek Jain

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[libvirt-users] [netcf]IFF_RUNNING flag on a bridge device
by Jianwei Hu 25 Jun '14

25 Jun '14

Hi All, I have one netcf question, please help me to resolve it, thanks. I can set a IFF_RUNNING flag to a bridge device which are no interface device attached. What status of a flag on a bridge device in current kernel?(w/o interface), is this a new change in kernel or other component? In netcf, but there is a patch to fix that flag issue, I can't understand it. fix wrong status of bridge devices The IFF_RUNNING flag is not set on a bridge device if there are no devices attached to it. So bridges without attached devices are reported as inactive. Destroying inactive devices leads to an error and thus the device can't be removed (easily) from the operating system. This patch checks if the device is a bridge and if so ignores the IFF_RUNNING flag. https://git.fedorahosted.org/cgit/netcf.git/commit/?id=7fa5fa5a1e43e6e2afec… My testing results of IFF_RUNNING on non-device bridge: Version: [root@rhel6 boot]# rpm -q kernel netcf kernel-2.6.32-468.el6.x86_64 netcf-0.2.4-1.el6.x86_64 [root@rhel6 ~]# brctl show br0 bridge name bridge id STP enabled interfaces br0 8000.000000000000 no [root@rhel6 ~]# ifconfig br0 br0 Link encap:Ethernet HWaddr 6A:3B:6F:DF:17:A9 BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:6 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:468 (468.0 b) [root@rhel6 ~]# ifconfig br0 up [root@rhel6 ~]# brctl show br0 bridge name bridge id STP enabled interfaces br0 8000.000000000000 no [root@rhel6 ~]# ifconfig br0 br0 Link encap:Ethernet HWaddr 6A:3B:6F:DF:17:A9 inet6 addr: fe80::683b:6fff:fedf:17a9/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:11 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:866 (866.0 b)

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[libvirt-users] get domain id or something else that can help determine domain in network ethernet
by Vasiliy Tolstov 24 Jun '14

24 Jun '14

Hello. I need to do some specific steps to bring up network for domain. I can't use bridge, nat, and other modes. I prefer ethernet type networking that bring up by script. But in case os script i have one big problem - how can i determine and get some domain data - for example if i get domain id, or mac address i can get other needed config. How can i get this data inside the script? Now i can get only interface name, that can't helps me, because it does not contains domain id... -- Vasiliy Tolstov, e-mail: v.tolstov(a)selfip.ru jabber: vase(a)selfip.ru

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Re: [libvirt-users] bridge could not be initialized
by Kashyap Chamarthy 24 Jun '14

24 Jun '14

On Tue, Jun 24, 2014 at 05:24:01PM +0530, Kashyap Chamarthy wrote: > [Please keep the list in CC for technical questions.] Now adding the list for real. > > On Mon, Jun 23, 2014 at 04:45:25PM +0530, abhishek jain wrote: > > Hi > > > > I'm trying to run VM from controller node onto compute node and it is > > stucking at spawning state. > > There could be any number of reasons. You need to carefully examine Nova > logs (/var/log/nova/) to see what's going on when you invoke a guest via > Nova. Hard to say without more investigative details. -- /kashyap

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[libvirt-users] Strange IPv6 Issues
by Tim Schumacher 23 Jun '14

23 Jun '14

Hi folks, I'm having the problem that my guests are most of the time not reachable via IPv6 and cant connect to IPv6 hosts, but if I ping the public IPv6-Adress of my bridge, the host can use IPv6 again. This is for incomming and outgoing traffic. I've attached my network xml file. virsh version reports this: Compiled against library: libvirt 1.2.4 Using library: libvirt 1.2.4 Using API: QEMU 1.2.4 Running hypervisor: QEMU 2.0.0 Routing on the guest looks like this: $ ip -6 route 2a01:4f8:200:2265:5054:ff:febe:e8e6 dev eth0 proto kernel metric 256 fe80::/64 dev eth0 proto kernel metric 256 default via fe80::5054:ff:fe32:e58 dev eth0 metric 1024 Routing on the host looks like this: $ ip -6 route 2a01:4f8:200:2265::/64 dev eth0 proto kernel metric 256 2a01:4f8:200:2265::/64 dev virbr0 proto kernel metric 256 fe80::/64 dev eth0 proto kernel metric 256 fe80::/64 dev vnet0 proto kernel metric 256 fe80::/64 dev vnet1 proto kernel metric 256 fe80::/64 dev virbr0 proto kernel metric 256 fe80::/64 dev vnet2 proto kernel metric 256 fe80::/64 dev vnet3 proto kernel metric 256 fe80::/64 dev vnet4 proto kernel metric 256 fe80::/64 dev vnet5 proto kernel metric 256 default via fe80::1 dev eth0 metric 1024 I'm running Debian Jessy on the host and on the guest. That means that they all are running Kernel 3.14. If you have any idea what could be causing this or if you need any information please post. Thanks for your time and help Tim

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[libvirt-users] ERROR: Domain not found: no domain with matching name 'ubuntu'
by Sanket Panhale 22 Jun '14

22 Jun '14

Hi guys, I am new to QEMU-KVM, libvmi and libvirt stuff. Libvmi uses libvirt. I am trying to to run process-list example of libvmi and getting error as below. It seems that this error may be due to libvirt as it is not able to find domain. I seek your kind help on below error: spanhal1@seclab2:~/KVMModule/libvmi-0.10.1$ sudo ./examples/process-list ubuntu libvir: QEMU error : Domain not found: no domain with matching name 'ubuntu' VMI_ERROR: Failed to get domain id from name. Failed to init LibVMI library.1 Here are few details of step I performed: 1. I have installed KVM module. (version 3.5) 2. Installed QEMU-KVM. (version 1.2.0) 3. Installed libvirt(version 0.1.2.5) 4. Installed libvirt-bin(version 0.9.8-2ubuntu17.19) 5. Installed libvmi. (version 0.10.1) 6. Then I am trying to run process-list example and I am getting error as above. sudo ./examples/process-list ubuntu To deal with this, I tried creating VM with domain name ubuntu using steps given at below link. https://help.ubuntu.com/community/KVM/CreateGuests http://virt-tools.org/learning/install-with-command-line/ Create VM: $sudo apt-get install virtinst $sudo fallocate -l 8192M /var/lib/libvirt/images/guest.img $sudo qemu-img create -f qcow2 /var/lib/libvirt/images/guest.qcow2 8192 spanhal1@seclab2:~/KVMModule$ sudo virt-install --connect qemu:///system -n ubuntu -r 512 -f guest.qcow2 -s 12 -c /home/spanhal1/KVMModule/ubuntu-12.04.4-desktop-amd64.iso --vnc --noautoconsole --os-type linux --accelerate --network=network:default ERROR Host does not support any virtualization options Here are few workaround and information for this error: 1. spanhal1@seclab2:~/KVMModule$ modprobe kvm spanhal1@seclab2:~/KVMModule$ lsmod | grep kvm kvm_intel 137888 0 kvm 422160 1 kvm_intel 2. spanhal1@seclab2:~/KVMModule$ kvm-ok INFO: /dev/kvm exists KVM acceleration can be used Check if virutalization is enabled by BIOS: spanhal1@seclab2:/var/log/libvirt$ sudo modprobe msr spanhal1@seclab2:/var/log/libvirt$ sudo rdmsr 0x3a 5 (Values 3 and 5 mean it's activated). Libvirt log: 2014-06-12 20:06:24.033+0000: 1305: error : virCommandWait:2188 : internal error Child process (LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin /usr/local/bin/qemu-system-x86_64 -help) status unexpected: exit status 1 2014-06-12 20:06:24.034+0000: 1305: error : virCommandWait:2188 : internal error Child process (LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin /usr/local/bin/qemu-system-x86_64 -help) status unexpected: exit status 1 Machine Details: Intel(R) Core(TM) i3-3240 CPU @ 3.40GHz flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm pcid sse4_1 sse4_2 popcnt tsc_deadline_timer xsave avx f16c lahf_lm arat epb xsaveopt pln pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase smep erms OS: Ubuntu 12.04.1 LTS Config file for Libvmi: ubuntu { ostype = "Linux"; sysmap = "/boot/System.map-3.5.0-22-generic"; linux_name = 0x460; linux_tasks = 0x240; linux_mm = 0x278; linux_pid = 0x2b4; linux_pgd = 0x48; } Thanks, Sanket.

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[libvirt-users] /etc/machine-id
by Gene Czarcinski 21 Jun '14

21 Jun '14

I was under the impression that the value of /etc/machine-id was unqiue for every OS installation on a system. This seems to be the case on real hardware. That is, if I install Fedora 19, Fedora 20, and Fedora-rawhide on a system, they will each have a different value for /etc/machine-id. This does not seem to be the case for qemy-kvm-libvirt virtual systems. SOmetimes they are different but I just noticed that a virtual system with both Fedora 20 and Fedora rawhide installed (btrfs partitioning), the two installations have the same value in /etc/machine-id. The two installs have different ext4 partitions for /boot, different subvols for the respective rootfs and the same/shared subvol for /home. Comment? Bug? Gene

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[libvirt-users] Managed USB passthrough
by Michael Han 21 Jun '14

21 Jun '14

Does the "managed" attribute of the hostdev element for a USB device make a difference? The Domain XML Format docs has the following sentence for the hostdev element: If managed is omitted or "no", and for USB devices, the user is responsible to call virNodeDeviceDettach (or virsh nodedev-dettach) before starting the guest or hot-plugging the device, and virNodeDeviceReAttach (or virsh nodedev-reattach) after hot-unplug or stopping the guest. Is that still accurate? The device seems to get passed through fine to my LXC container without any dettach/reattach calls. But I'm seeing some other strange USB behaviour in the guest and just want to see if it's at all related to the managed attribute. Cheers.

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[libvirt-users] Access permissions of passed through character devices
by Pickartz, Simon 20 Jun '14

20 Jun '14

Dear all, I am using libvirt in conjunction with LXC. In accordance with http://libvirt.org/formatdomain.html#elementsHostDevCaps I pass an InfiniBand adapter through to the guest container. However, within the container the access permissions are not the same. Within the host they are like this: crw-rw-rw- 1 root root 10, 56 20. Jun 09:40 rdma_cm crw-rw-rw- 1 root root 231, 224 20. Jun 09:41 ucm0 crw-rw-rw- 1 root root 231, 0 20. Jun 09:41 umad0 crw-rw-rw- 1 root root 231, 1 20. Jun 09:41 umad1 crw-rw-rw- 1 root root 231, 192 20. Jun 09:41 uverbs0 Within the guest, only root may read or write from/to the device: crw------- 1 root root 10, 56 20. Jun 09:40 rdma_cm crw------- 1 root root 231, 224 20. Jun 09:41 ucm0 crw------- 1 root root 231, 0 20. Jun 09:41 umad0 crw------- 1 root root 231, 1 20. Jun 09:41 umad1 crw------- 1 root root 231, 192 20. Jun 09:41 uverbs0 Do you have any ideas how I can tell lxc via libvirt to change the permissions in such a way that they correspond to those on the host system? Best regards, Simon

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