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[libvirt-users] Does libvirt have API to detect image format
by Jianfeng Tang 14 Aug '14

14 Aug '14

> I am using backing store when I create my volume. However, the backing store file is from another team, which can be either in raw or in qcow2 format. Is there a libvirt API to detect image format by given an image file? Or I have to run qemu-img? >

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[libvirt-users] [qemu-kvm] Network bandwidth limits via libvirt
by Romain Hardouin 13 Aug '14

13 Aug '14

Hi all, I try to understand why the interface bandwidth limits are not applied to my Ubuntu 12.04 VM (qemu-kvm driver) and I would need some insights. I spawn my VM with OpenStack and when I issue a dumpxml on my domain, I can see that bandwidth limits are set: <interface type='ethernet'> <mac address='02:68:b5:c6:fa:a5'/> <bandwidth> <inbound average='500' peak='500' burst='1000'/> <outbound average='500' peak='500'/> </bandwidth> <script path=''/> <target dev='tap68b5c6fa-a5'/> <model type='virtio'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> However when I send a big file with scp I don't see any limits applied to the transfer rate. I've checked the domain log and I didn't see any qemu command line argument related to bandwidth limits. Should I expect to see a specific argument like "bps_wr" for IO limits? Also, should I expect to see something in particular under the cgroup directory for the qemu instance? Or do network limits are managed in another way than with cgroups? Below some information about my hypervisor: % virsh -V Virsh command line tool of libvirt 1.2.2 See web site at http://libvirt.org/ Compiled with support for: Hypervisors: QEMU/KVM LXC UML Xen LibXL OpenVZ VMWare VirtualBox Test Networking: Remote Network Bridging Interface netcf Nwfilter VirtualPort Storage: Dir Disk Filesystem SCSI Multipath iSCSI LVM RBD Sheepdog Miscellaneous: Daemon Nodedev AppArmor Secrets Debug Readline Modular qemu-kvm: 2.0.0 Kernel: 3.2.0-64-generic Any hints will be appreciated :) Thanks, Romain

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[libvirt-users] IP/MAC antispoof-protection
by Anton Gorlov 12 Aug '14

12 Aug '14

Hi all. What right way to protect ip/mac spoofing for guests withnount dhcp and other 1 ip per guest?

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[libvirt-users] Passing literal -cpu model string to qemu
by Richard W.M. Jones 11 Aug '14

11 Aug '14

On aarch64 with -M virt, the default CPU model is cortex-a15 (a 32 bit CPU). This is IMHO a stupid default, but there we are. Therefore most users will need to pass the `-cpu cortex-a53' or `-cpu cortex-a57' flag to qemu, depending on a complex formula of their host CPU and if they are using TCG or not. However I cannot work out how to pass this through libvirt. The obvious one would be: <cpu><model>cortex-a57</model></cpu> This passes `-cpu host' which is both wrong and likely to be a bug. I tried adding various flags and studying the source, but it's extremely non-obvious how to do this. Also adding the following into cpu_map.xml didn't make any difference: --- a/src/cpu/cpu_map.xml +++ b/src/cpu/cpu_map.xml @@ -626,6 +626,11 @@ <vendor name='IBM'/> <pvr value='0x004b0100'/> </model> + </arch> +  + <arch name='aarch64'> + <model name='cortex-a53'/> + <model name='cortex-a57'/> </arch> </cpus> Ideas here? Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-df lists disk usage of guests without needing to install any software inside the virtual machine. Supports Linux and Windows. http://people.redhat.com/~rjones/virt-df/

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[libvirt-users] Windows 8 virtualized on a Linux host
by arnaud gaboury 10 Aug '14

10 Aug '14

I plan to dual boot w8 and Archlinux, and virtualize the same w8 machine with libvirt qemu/kvm. I already did the dual boot. I am now starting the virtualization. My plan was to use the w8 partition as a Disk volume pool [1]. Unfortunately, I didn't noticed only FAT32 was a valid format when I installed w8 on NTFS. I need to change my whole setup, but beforethat, I want to be sure libvirt does not accept NTFS. So please, can you confirm? Then, it seems I am in trouble as my readings let me think w8 will not install on FAT32. Am I correct? Now it sounds to me I am in a dead end. Does anyone have any hint to achieve my plan? Thank you for any suggestions. [1]http://libvirt.org/storage.html

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[libvirt-users] Live blockcopy onto storage pool that is an NFS mount?
by Andrew Martin 09 Aug '14

09 Aug '14

Hello, I am running qemu-kvm 1.4.0 and libvirt 1.0.2 on Ubuntu 12.04. I have two NFS mountpoints configured as two separate pools in virsh: <pool type='dir'> <name>nfs1</name> <uuid>419d799c-2493-6ebc-6848-53b0919e7bad</uuid> <capacity unit='bytes'>6836057014272</capacity> <allocation unit='bytes'>0</allocation> <available unit='bytes'>6836057014272</available> <source> </source> <target> <path>/var/lib/libvirt/images/nfs1</path> <permissions> <mode>0711</mode> <owner>0</owner> <group>0</group> </permissions> </target> </pool> The XML for the nfs2 pool is similar, with the mountpoint being /var/lib/libvirt/images/nfs2. I would like to be able to move the VM disk from one of the NFS mountpoints to another (nfs1 --> nfs2) live. I followed the instructions here: http://thr3ads.net/libvirt-users/2013/02/2174486-Migrate-VMs-to-different-s… However when I attempt the blockcopy command, I receive this error: Failed to create file '/var/lib/libvirt/images/nfs2/vm.qcow2': Operation not permitted Is it not possible to blockcopy in this way to an NFS mount? Thanks, Andrew

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[libvirt-users] File permissions on VNC unix sockets
by Landon Gilbert-Bland 08 Aug '14

08 Aug '14

I am using kvm libvirt/qemu, and am trying to get VNC working with unix sockets. I'm using the following in my XML: <graphics type='vnc' socket='/tmp/kvmtest'/> This works, it creates the unix socket and I can use it for VNC. But it creates the socket with 755 permissions, and owned by libvirt-qemu:kvm. Ideally, I would like it to be 770 root:libvirtd, but could also work with 775 libvirt-qemu:kvm. Basically, I would like the group to be read/write/execute, so that anyone in this group can use virt-manager (or whatever) to get into the vm with vnc. I haven't found a way to change this in the settins. It doesn't seem to be honoring the unix socket settings in /etc/libvirt/libvirdd.conf (it looks like those are only for libvirt-sock and libvirt-sock-ro), and I haven't been able to find any documentation about changing these permissions in the XML. I can manually chmod/chown the socket after it is created (manually or with a cron), but that is far from an ideal solution. I don't suppose anyone has run across a configuration option for this that I have missed? I have only tested this in ubuntu 14.04.1 and debian testing, for what it's worth. Thanks, --landon

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[libvirt-users] Understanding Libvirt Java API in order to get CPU usage of a VM
by Restituto Marcus Arevalo 07 Aug '14

07 Aug '14

I'm having a problemin understanding the Libvirt Java API. Here is my sourcein reading some of the classes: http://libvirt.org/sources/java/javadoc/ I have no idea where to start in order for me to get the CPU usage. Can anybody help? Or at least give me some points on where to start in order for me to get the CPU usage of a VM in KVM? Any suggestions will really help. Thanks regards, Marco

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[libvirt-users] [help] Does "virsh blockpull" works on live virtual machine
by chenyanqiu＠keytonecloud.com 07 Aug '14

07 Aug '14

Hi all, I have a kvm virtual machine running (qemu version 2.0), and I had took several external snapshots of the disk( using "virsh snapshot-create-as"). Now, the existed disk files relationship look like: base <- snap1 <-snap2 <- current using disk file. Now I want to remove snap1 and snap2, and let current disk using the base image file as back file directly. Unfortunately, for some reason, I can not shutdown the vm, and exectue the "virsh blockpull" command. Can I execute the "virsh blockpull" while the vm is power on, and the application in the vm is not affected? Thanks very much! Daniel

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[libvirt-users] possible to dynamically set/add network domain name?
by Rich Megginson 07 Aug '14

07 Aug '14

trying to use virsh net-update to add a domain name libvirt-1.1.3.5-2.fc20.x86_64 sudo virsh net-update default add domain "<domain name='test'/>" --live --config error: this function is not supported by the connection driver: can't update 'domain' section of network 'default' is it possible to add a domain using net-update?

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