- Users - libvirt List Archives

[libvirt-users] How can I setup a privileged container
by WANG Cheng D 03 Jul '14

03 Jul '14

Dear all, I want to setup a privileged container, which means I can set the priority of a process to SCHED_RR (real-time) dynamically by calling sched_setscheduler() in a C program running on a container. In my system (host: fedora19, container: fedora19, libvirt 1.2.5), my C code reports "operation not permitted" when sched_setscheduler() is called. I found a link (https://www.redhat.com/archives/libvir-list/2014-June/msg00562.html) which is talking about container capability drops and keeps, but only "nice" is mentioned and I don't know how to turn on "priority" feature on a container? Any comments are highly appreciated. Cheng

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[libvirt-users] all windows vm could not start because the following file is missing or corrupt
by Lucas -LandM- 02 Jul '14

02 Jul '14

Hi, After some problems in the server I can't start windows XP virtual machines. - Yesterday we got full disk (100%). I deleted some files. Solved. - I update Centos 5.6. I guess libvirt was updated from 0.9 to 0.10. We have to use this kernel: 2.6.32-042stab079.6 because this bug is not in the release: https://bugzilla.openvz.org/show_bug.cgi?id=2915 Now, I try to start windows XP machines and all give me same error could not start because the following file is missing or corrupt c:\WINDOWS\SYSTEM32\CONFIG\SYSTEM If this error were in a particular VM I try to solve it manually, but same error in three diferent VM is not a coincidence. I suppose it is a upgrade issue. What should I do? Thanks in advanced, Lucas

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[libvirt-users] changing the priority of a process in the container is not permitted
by WANG Cheng D 02 Jul '14

02 Jul '14

Dear all, I want to run a process in a container with a real-time (RT) priority. When the sched_setscheduler(0, SCHED_RR, &sparam) is called in the container, an error is reported which is "operation not permitted" I had added the following line in the file /etc/security/limits.conf for both the host and the container, which means allowing all users to change the priority of the process, but it still doesn't work. * - rtprio 100 I wonder how to change the privilege of a container so that it has the similar privilege of the root user of the host. Thank you in advance Cheng

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[libvirt-users] Libvirt installion error: You must install the libyajl library & headers to compile libvirt
by WANG Cheng D 02 Jul '14

02 Jul '14

Dear all, I am installing the libvirt 1.2.5 on my newly installed Fedora19. When I run ./configure, an error is reported: "You must install the libyajl library & headers to compile libvirt" In fact, the package yajl-2.0.4-2fc19.x86_64.rpm has been installed on the fedora19. I found several links talking about this error and I downloaded 3 files (configure.ac, m4/virt-yajl.m4, src/qemu/qemu_capabilities.c) from the link given by Daniel Berrange (http://libvirt.org/git/?p=libvirt.git;a=commit;h=654c709baaa6fdcff6b6d38abb…) , but it does not work. Am I missing something? Best regards, Cheng

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[libvirt-users] virsh update-device issues
by Oleg Bondarev 02 Jul '14

02 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 01 Jul '14

01 Jul '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 01 Jul '14

01 Jul '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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