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[libvirt-users] virsh update-device issues
by Oleg Bondarev 01 Jul '14

01 Jul '14

Hi, I faced a couple of issues with libvirt update-device function: 1. http://libvirt.org/hvsupport.html says that virDomainUpdateDeviceFlags is supported since 0.8.0 API version in qemu driver. However when trying to update network device (changing source bridge of the interface) on Ubuntu with 0.9.8 libvirt version I get the following error: "*this function is not supported by the connection driver: cannot modify network device configuration"* What may be the reason for such error? 2. Not able to rename target device name of an interface. For example if have running instance with interface: * <interface type='bridge'>* * <mac address='fa:16:3e:80:f4:49'/>* * <source bridge='qbre1894135-13'/>* * <target dev='vnet0'/>* * <model type='virtio'/>* * <alias name='net0'/>* * <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>* * </interface>* and then try to update: *$ sudo virsh update-device --persistent --config --live 1 dev.xml* where dev.xml: * <interface type='bridge'>* * <mac address='fa:16:3e:80:f4:49'/>* * <source bridge='qbre1894135-13'/>* * <target dev='tap123'/>* * <model type='virtio'/>* * </interface>* I get: * error: Failed to update device from dev.xml* * error: Operation not supported: cannot modify network device tap name* This happens even if rename vnet0 to tap123 manually with *ip link set vnet0 name tap123* before interface update. And after instance reboot tap123 is renamed back to vnet0. Is there a strong reason to not allow modifying network device tap name? Will appreciate any assistance with the described issues. Thanks, Oleg

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[libvirt-users] libvirt error
by abhishek jain 01 Jul '14

01 Jul '14

Hi I need to run libvirt without ebtables support as it results in following error while running VM.... sudo virsh start instance-0000000b error: Failed to start domain instance-0000000b error: Error while building firewall: Some rules could not be created for interface tapf733e054-fe: Failure to execute command '$EBT -t nat -A libvirt-J-tapf733e054-fe -j J-tapf733e054-fe-mac' : 'Unable to update the kernel. Two possible causes: 1. Multiple ebtables programs were executing simultaneously. The ebtables userspace tool doesn't by default support multiple ebtables programs running concurrently. The ebtables option --concurrent or a tool like flock can be used to support concurrent scripts that update the ebtables kernel tables. 2. The kernel doesn't support a certain ebtables extension, consider recompiling your kernel or insmod the extension. .'. Please help regarding this. Thanks Abhishek Jain

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[libvirt-users] NWFilter mac address matches chain
by Brian Rak 30 Jun '14

30 Jun '14

The documentation indicates ( via http://libvirt.org/formatnwfilter.html#nwfelemsRulesProtoMAC ) that <mac> rule types should go in the 'root' chain, however one of the example rules ( from http://libvirt.org/git/?p=libvirt.git;a=blob_plain;f=examples/xml/nwfilter/… ) has the mac address match in the ipv4 chain. Which is the correct chain for these?

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[libvirt-users] Unable to migrate vm from redhat to ubuntu using virsh migrate
by Mani Devarajan 30 Jun '14

30 Jun '14

Hello All, I am working on migrating the vm from redhat to ubuntu. the emulator value is as below. Ubuntu: <emulator>/usr/bin/qemu-system-x86_64</emulator> redhat: <emulator>/usr/libexec/qemu-kvm</emulator> When i try to migrate from redhat, i get the following error. It would be great help if you can suggest how to workaround the issue. virsh migrate --live --verbose --persistent vm1 qemu+ssh://host-3/system error: Cannot check QEMU binary /usr/libexec/qemu-kvm: No such file or directory Thanks in advance, Mani

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[libvirt-users] getting CPU usage of KVM
by Restituto Marcus Arevalo 30 Jun '14

30 Jun '14

Greetings sir, I am currently taking up Computer Science in my school. I just want to ask how do you get the CPU usage and Memory usage of the VMs (I'm referring sir to the graphs that the Virtual Machine Manager is displaying)? I need to get the numbers (the numbers are enough, I don't need the graph) of these informations because I will be needing it for my thesis. What suggestions can you give me? Like create a program in C or Java or Python using the libvirt API, etc. Your help will be much appreciated sir. Thank you very much. regards, Marco P.S. I could explain what my thesis is all about in an email if you want/need sir. Thanks again

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[libvirt-users] Connecting to session instance without socket path is not supported by the ssh connection driver
by Theodotos Andreou 30 Jun '14

30 Jun '14

Hi all, I have setup some Virtualbox VMs under my normal user session. When I try to list the vbox machines locally I get: $ virsh -c vbox:///session list Id Name State ---------------------------------------------------- 3 Ubuntu-MASS-controller running When I try to list the machines from a remote location I get: $ virsh -c vbox+ssh://theodotos@10.0.2.2/session list setlocale: No such file or directory error: failed to connect to the hypervisor error: Operation not supported: Connecting to session instance without socket path is not supported by the ssh connection driver I have setup public key authentication between the remote machine and the VBox host. Any idea what am I doing wrong?

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[libvirt-users] libvirt on OpenStack
by kerwin 30 Jun '14

30 Jun '14

Hi, I am running OpenStack Cluster and use libvirt + cgroup to limit vm’s performance https://wiki.openstack.org/InstanceResourceQuota What I am confusing is.. 1. After running a vm instance with some croup limit applied, I can’t find any related cgroup settings. 2. Can I change limit value after instance is running? like change disk_read_iops_sec from 10 to 20. One of the xml file like below. <domain type="kvm"> <uuid>27f49e5c-8ee0-4a09-8269-5fa31acd2983</uuid> <name>instance-000000da</name> <memory>2097152</memory> <vcpu cpuset="1-12">1</vcpu> <sysinfo type="smbios"> <system> <entry name="manufacturer">Red Hat Inc.</entry> <entry name="product">OpenStack Nova</entry> <entry name="version">2013.2.3-1.el6</entry> <entry name="serial">9fa4736a-2b02-11e1-a8e4-5cf3fcb968b4</entry> <entry name="uuid">27f49e5c-8ee0-4a09-8269-5fa31acd2983</entry> </system> </sysinfo> <os> <type>hvm</type> <boot dev="hd"/> <smbios mode="sysinfo"/> </os> <features> <acpi/> <apic/> </features> <clock offset="utc"> <timer name="pit" tickpolicy="delay"/> <timer name="rtc" tickpolicy="catchup"/> </clock> <cpu mode="host-model" match="exact"/> <devices> <disk type="file" device="disk"> <driver name="qemu" type="qcow2" cache="none"/> <source file="/data1/lib/nova/instances/27f49e5c-8ee0-4a09-8269-5fa31acd2983/disk"/> <target bus="virtio" dev="vda"/> <iotune> <read_bytes_sec>25600000</read_bytes_sec> <write_bytes_sec>40960000</write_bytes_sec> </iotune> </disk> <interface type="bridge"> <mac address="fa:16:3e:49:04:ce"/> <model type="virtio"/> <source bridge="br-int"/> <target dev="tape30b3c05-12"/> <virtualport type="openvswitch"> <parameters interfaceid="e30b3c05-126c-45bd-ac31-e5eb5481a652"/> </virtualport> </interface> <serial type="file"> <source path="/data1/lib/nova/instances/27f49e5c-8ee0-4a09-8269-5fa31acd2983/console.log"/> </serial> <serial type="pty"/> <input type="tablet" bus="usb"/> <graphics type="vnc" autoport="yes" keymap="en-us" listen="10.13.128.43"/> </devices> </domain> ✉ -- 朴元奎 kerwin

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[libvirt-users] Reg : How to boot the external system checkpoint snapshots using KVM
by Gousemeera A. 28 Jun '14

28 Jun '14

Hi Team, I have created a "External system checkpoint snapshot" using the following link. http://kashyapc.fedorapeople.org/virt/external-system-checkpoint-snapshot.t… The disk and ram snapshot has been created successfully. The disk snapshot have the QCOW2 file format,I tried to boot the disk snapshot (qcow2)file using the KVM but it throws the error *" No bootable disk availble"* message, also i tried to revert the snapshot it throws the *"external snapshot revert not yet supported"* error message. Versions details: --------------- Libvirt - 1.0.5 (compiled) Ubuntu - 12.04 I had the following doubts on snapshots. 1. It is possible to directly boot the external system check point snapshots ??? 2. Snapshot boot is supported in libvirt kvm ? 3. If snapshot boot is possible, what are the steps to do ? can you please advice me .. Thanks in advance.... Please get back to me if you need any other clarifications... -- *With Thanks & Regards,* *Gousemeera* +91-9842450796

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[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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