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[libvirt-users] performance with libvirt and kvm
by Nirmal Guhan 04 Aug '10

04 Aug '10

Hi, I am seeing a performance degradation while using libvirt to start my vm (kvm). vm is fedora 12 and host is also fedora 12, both with 2.6.32.10-90.fc12.i686. Here are the statistics from iperf : >From VM: [ 3] 0.0-30.0 sec 199 MBytes 55.7 Mbits/sec >From host : [ 3] 0.0-30.0 sec 331 MBytes 92.6 Mbits/sec libvirt command as seen from ps output : /usr/bin/qemu-kvm -S -M pc-0.11 -enable-kvm -m 512 -smp 1 -name f12kvm1 -uuid 9300bfe2-2b9c-d9f0-3b03-9c7fe9934393 -monitor unix:/var/lib/libvirt/qemu/f12kvm1.monitor,server,nowait -boot c -drive file=/var/lib/libvirt/f12.img,if=ide,bus=0,unit=0,boot=on,format=raw -drive if=ide,media=cdrom,bus=1,unit=0,format=raw -net nic,macaddr=52:54:00:51:7c:39,vlan=0,model=virtio,name=net0 -net tap,fd=21,vlan=0,name=hostnet0 -serial pty -parallel none -usb -vnc 127.0.0.1:0 -k en-us -vga cirrus -balloon virtio If I start a similar vm using qemu-kvm directly, the performance matches with the host. qemu kvm : [ 3] 0.0-30.0 sec 329 MBytes 91.9 Mbits/sec TCP window size is 64K for all the cases. Command used : qemu-kvm vdisk.img -m 512 -net nic,model=virtio macaddr=$macaddress -net tap,script=/etc/qemu-ifup Any clues? Thanks, Nirmal

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[libvirt-users] libvirt and lxc
by Nirmal Guhan 04 Aug '10

04 Aug '10

Is anyone using libvirt for lxc ? I am trying to do so and running into an issue. The system container starts fine with lxc tools and am able to connect to it. Here is the snippet of my xml file (rest is same as in http://libvirt.org/drvlxc.html) <devices> <emulator>/usr/libexec/libvirt_lxc</emulator> <filesystem type='mount'> <source dir='/lxc/f12'/> <target dir='/'/> </filesystem> <interface type='bridge'> <mac address='52:54:00:82:87:64'/> <source bridge='br0'/> <target dev='tap0'/> </interface> <console type='pty'> <target port='0'/> </console> </devices> Am able to start the container but when I do console : virsh # console f12lxc Connected to domain f12lxc Escape character is ^] <<hangs here and I press enter, it destroys the domain>> virsh # Am running Fedora 12 with 2.6.32.10-90.fc12.i686. I changed target dev='tap0' to 'veth' and no change in the behavior. Please help. Thanks, Nirmal

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[libvirt-users] virDomainSetSchedulerParameters() does not support KVM?
by Zhang Qian 30 Jul '10

30 Jul '10

Hi, I have one RHEL 5.5 Xen box and one RHEL 5.5 KVM box. In the Xen box, the following command works well: $ virsh schedinfo RHELu3T Scheduler : credit weight : 256 cap : 0 But in KVM box, it can not work: $ virsh schedinfo RHEL5u3 Scheduler : Unknown error: this function is not supported by the hypervisor: virDomainGetSchedulerType Is it because that the libvirt APIs virDomainGetSchedulerParameters() and virDomainSetSchedulerParameters() does not support KVM? Is there any plan for libvirt to support that? Or any equivalent in libvirt can be used to do the same thing for KVM？ Thanks! Qian

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[libvirt-users] Too many active clients?
by jeremy avnet 29 Jul '10

29 Jul '10

Hello, I'm receiving a lot of these since a couple of days ago: libvirtd: 16:30:10.960: error : qemudDispatchServer:1282 : Too many active clients (20), dropping connection I'm trying to figure out where all these active clients are coming from. I have a daemon running the interacts with libvirtd, but it only creates two long-lived connections (I'm very sure). What constitutes an active connection? The only other libvirtd access that goes on are some quick lived munin process which connect in various ways and using virsh on the command line. Libvirt version 0.7.5-5ubuntu27 on Ubuntu 10.04. Thanks! .:. jeremy

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[libvirt-users] Hello world help needed
by Dale Amon 29 Jul '10

29 Jul '10

I am trying to work my way up the learning curve through a forest of conflicting and mostly non-working examples and help pages spread about the internet. I have had no trouble getting a basic vm to build and to then start it up. But I have utterly failed to gain access to the machine. The only host I have available that can run it is a remote server. I have not got the networking side working yet, but I can live with that for the moment because I have thus far not been able to get access to a simple console on the vm. Here is the machine: <domain type='kvm' id='2'> <name>ubuntu</name> <uuid>8904d893-87dc-dc1f-0219-486745a370f6</uuid> <memory>262144</memory> <currentMemory>262144</currentMemory> <vcpu>1</vcpu> <os> <type arch='x86_64' machine='pc-0.12'>hvm</type> <boot dev='hd'/> </os> <features> <acpi/> </features> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/bin/kvm</emulator> <disk type='file' device='disk'> <source file='/home/myhome/ubuntu-kvm/tmpl3Xutj.qcow2'/> <target dev='hda' bus='ide'/> </disk> <interface type='network'> <mac address='52:54:00:be:d5:c2'/> <source network='default'/> <target dev='vnet0'/> <model type='virtio'/> </interface> <input type='mouse' bus='ps2'/> <graphics type='vnc' port='5900' autoport='yes' listen='127.0.0.1'/> <video> <model type='cirrus' vram='9216' heads='1'/> </video> <serial type='pty'> <source path='/dev/pts/2'/> <target port='0'/> </serial> <console type='pty' tty='/dev/pts/2'> <source path='/dev/pts/2'/> <target port='0'/> </console> </devices> <seclabel type='dynamic' model='apparmor'> <label>libvirt-8904d893-87dc-dc1f-0219-486745a370f6</label> <imagelabel>libvirt-8904d893-87dc-dc1f-0219-486745a370f6</imagelabel> </seclabel> </domain> I dumped the original and added the pty stuff from an example, but when I create it and connect to the console: # virsh -c qemu:///system create ubuntu2.xml --console Domain ubuntu created from ubuntu2.xml Connected to domain ubuntu Escape character is ^] nothing appears and nothing I type echoes. At least I can escape though... I seem to have no trouble creating them, but it sure would be nice to be able to access them. Oh, and btw. Every time I create a VM with the ubuntu ubuntu-vm-builder kvm hardy --mem 256 --iso /path/to/ubuntu-8.10-server-i386.iso ubuntu-vm-builder kvm lucid --mem 256 --iso ubuntu-10.04-server-amd64.iso It leaves a loopback disk behind that never goes away. I've had to reboot the server once already and upped loop_max to 32 so I would be able to work longer before doing so again.

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[libvirt-users] Using Java bindings to event callback
by Bruno Costa 27 Jul '10

27 Jul '10

I'm having some trouble using java bindings for domain events. Can anyone provide me an example on how to use this, namely conn.domainEventRegisterAny? Any suggestions? Thanks, Bruno Costa

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[libvirt-users] libvirt use spice
by Songwen Liao 27 Jul '10

27 Jul '10

Hi，friends， i am the new guy for here...i met a problem with libvirt. i create a new virtual machine with kvm,i want to use the spice protocol to connect the machine's destop. but it's appears that libvirt cannot support spice. So,any idears,what should i do,a patch file ? thanks a lot. -- Name: Ben ----------------------------------------------------------------------------------------------- Mobile: 15800910495 Msn: liaosongwen(a)live.cn QQ: 43455134

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[libvirt-users] libvir: Domain error <domName>: invalid argument in virDomainGetXMLDesc
by Priya 23 Jul '10

23 Jul '10

All, I just downloaded and installed libvirt-bin and this is my first email to the group, so I apologize in advance if my questions are too naive! So, I am trying to access VMs running on xen3.2 hypervisor (host with kernel 2.6.24-24-xen) using virt-manager installed on a machine running Ubuntu 9.04 (client machine). I got to the point where I can connect to my virtual machine and my domain-0 through the virt-manager client (meaning that I already have libvirt, ssh-askpass downloaded and the libvirtd and xend running on my host machine), and on the client machine I can view the window showing the statistics of CPU utilization of my domain-0 and user domain. The attachment shows a shapshot of the virt-manager on my client machine. Now when I try to access the GUI of either of domain-0 or the user domain (by selecting the specific domain and clicking open) I get the following error message in a pop-up on my client and in the libvirtd console on the host: "libvir: Domain error xen_2: invalid argument in virDomainGetXMLDesc" I tried to Google this error, but I don't find any clear answers. It seems to be a bug in the libvirt implementation that has been detected and resolved already. And I am confused as to why is it that such a recent version is still buggy? Should I have downloded another version instead? I desperately wish to resolve this problem and would appreciate any guidance. Many thanks! -- Priya Bhat

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[libvirt-users] How to create a guest os from existing disk image file with virt-install
by Rajiv Rajaian 22 Jul '10

22 Jul '10

Hi I have configured KVM with Fedora Core 13 by enabling the KVM virtualization option while installing OS. I have successfully created the guest OS by using the virt-install API /usr/sbin/virt-install --name centos5 --ram 512 --disk path=/var/lib/libvirt/images/ centos.img,size=5 --network network:default --accelerate --vnc -c /tmp/CentOS-5.3-i386-bin-DVD.iso Os installed successfully and after rebooting am able to login to the guest OS using the virt-viewer command using vnc viewer ..It shows Booting from Hard Disk... GRUB Loading stage2..... But the guest os is not booted I want to the create the guest os from existing configured disk /var/lib/libvirt/images/centos.img.. What modifications should be done with my configuration file ?? Pleas help me to solve this. [root@kvmcluster ~]# virsh dumpxml centos5 <domain type='qemu' id='2'> <name>centos5</name> <uuid>cabfad09-ff8b-e1ca-051a-6729e301f6a1</uuid> <memory>524288</memory> <currentMemory>524288</currentMemory> <vcpu>1</vcpu> <os> <type arch='i686' machine='fedora-13'>hvm</type> <boot dev='cdrom'/> </os> <features> <acpi/> <apic/> <pae/> </features> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>destroy</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/bin/qemu</emulator> <disk type='file' device='disk'> <driver name='qemu' type='raw'/> <source file='/var/lib/libvirt/images/centos.img'/> <target dev='hda' bus='ide'/> <alias name='ide0-0-0'/> <address type='drive' controller='0' bus='0' unit='0'/> </disk> <disk type='file' device='cdrom'> <driver name='qemu'/> <source file='/tmp/CentOS-5.3-i386-bin-DVD.iso'/> <target dev='hdc' bus='ide'/> <readonly/> <alias name='ide0-1-0'/> <address type='drive' controller='0' bus='1' unit='0'/> </disk> <controller type='ide' index='0'> <alias name='ide0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> </controller> <interface type='network'> <mac address='52:54:00:bf:32:c2'/> <source network='default'/> <target dev='vnet0'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </interface> <serial type='pty'> <source path='/dev/pts/2'/> <target port='0'/> <alias name='serial0'/> </serial> <console type='pty' tty='/dev/pts/2'> <source path='/dev/pts/2'/> <target port='0'/> <alias name='serial0'/> </console> <input type='mouse' bus='ps2'/> <graphics type='vnc' port='5900' autoport='yes' keymap='en-us'/> <video> <model type='cirrus' vram='9216' heads='1'/> <alias name='video0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> </devices> <seclabel type='dynamic' model='selinux'> <label>system_u:system_r:svirt_t:s0:c370,c413</label> <imagelabel>system_u:object_r:svirt_image_t:s0:c370,c413</imagelabel> </seclabel> </domain>

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[libvirt-users] Force network to append iptables rules to end or specified number?
by steven765＠yahoo.com 21 Jul '10

21 Jul '10

Subject line says it all. Every time I restart a network libvirt inserts its standard rules at the head of the ip forward chain. The deny lines in there clobber access to my servers. Is there any way to make it append those rules at a specific number or at the end by default? Many Thanks, Steve

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