February 2012 - Users - Libvirt List Archives

Re: [libvirt-users] want to access the page file of VM from host on Xen platform

by Eric Blake

[re-adding the list, so others may benefit from the answers] On 02/09/2012 02:00 PM, Irfan Ahmed wrote: > thanks Eric. Just for clarification, if the page is swaped out from RAM to HDD, will virDomainMemoryPeek functionalso retrive the block of size 'size' from that too or it is only restricted to the pages exist in RAM. virDomainMemoryPeek is limited to reading what is in the guest's RAM. As I said earlier, if you are interested in reading what is in the guest's disk, you might find libguestfs to be a more powerful tool. > > > Is there any example program that uses virDomainMemoryPeek function. Alas, no one has yet wired up virsh to call virDomainMemoryPeek (patches welcome), and I don't personally have any example programs that use it. Rich Jones might have some better ideas (as both author of libguestfs, and as the implementer of virDomainMemoryPeek). -- Eric Blake eblake(a)redhat.com +1-919-301-3266 Libvirt virtualization library http://libvirt.org

13 years, 1 month

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[libvirt-users] want to access the page file of VM from host on Xen platform

by Irfan Ahmed

Is there a way to access swap memory or page file of a virtual machine from host. I am using Xen and want to access the page file contents of my windows XP SP2 virtual machine from dom0. Please do tell me if there is already a tool that could provide this functionality. Any help is appreciated. Thanks and regards, Irfan

13 years, 1 month

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[libvirt-users] bad IO on VM

by Akendo

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I have to create some VM. I using KVM for it, manage by libvirtd. The problem of my is that the IO is very bad. I'm nut sure, but I using currently vmdk. Could this be the problem? My settings for the VM is: vitrio driver vmdk no cache It's so bad that the Oracle DB can't work efficient. http://pastebin.com/raw.php?i=sDyvcJmB so far akendo -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQEcBAEBAgAGBQJPM5NGAAoJEARqOhiQNM7ZQKMIAIVo9+SYmSrJAIooB0xObSEz ERmMANdkaA7tLGBWaSvKTh5Gg0d3NdP9P1aCIS38OXBBKxqy2NRcksgMikJmlaVp DitLHsSKKLNpBZpGe9xBvqrNCbJVdFLmWIjYk+WEBWXlxHFYob9FuSdejQ53JKKI mfLbcfhWb/6mEfcgkWVAWh9PumuRKZ8YLwWOfj/qJhkhnJOfsusai8Ns+TfMpO7s M72d2RYknpyXiNEJSwUIDlEl0OHqStG3T4+Tpx8Wmoqfs+cm4Hklca1GFGV/Wao2 aPYdkLYvMamAMyN8tB2I0c9MXXUQ8mxgruJReHM9NUYoX4iIwIazElPcZBp4FWI= =MDJL -----END PGP SIGNATURE-----

13 years, 1 month

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[libvirt-users] serial console with virt-install

by Felix Blanke

Hello, sorry for bother you again. I'm new to kvm and libvirt, that's why my next question is maybe some sort of noob question :) I have a headless server (no X at all, just ssh) and want to run some virtual machines on it. I have kvm etc. all set up. When doing something like virt-install --connect qemu:///system -n template -r 1024 --disk path=/data/vm/template.qcow2,format=qcow2 -c /data/vm/livedvd-amd64-multilib-2012.iso --os-type linux -v --network=bridge:br0 --virt-type kvm --arch x86_64 --graphics none the vm starts Starting install... Creating domain... Connected to domain template Escape character is ^] That's it, no more output. I see two threads running, each takes up 100% cpu. I tried to help myself via google and read a lot hints like "you need to setup your guest to get a serial console...", but that's not possible when running a fresh vm. All I want to do is getting some sort of console from the vm to start the installation with the given .iso file. Could someone lead me into the right direct? A link to an explanation would be more then enough :) Thanks for your help. Kind regards, Felix Blanke

13 years, 1 month

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[libvirt-users] virt-install: "ERROR Host does not support any virtualization options"

by Felix Blanke

Hello, I have a problem with virt-install. I want to use it to create my vm and manage them. But whenever I execute the virt-install cmd I get the error msg mentioned in the subject. Here are some more informations: hp ~ # virt-install --virt-type kvm --arch x86_64 --debug Mon, 06 Feb 2012 19:57:29 DEBUG Launched with command line: /usr/bin/virt-install --virt-type kvm --arch x86_64 --debug Mon, 06 Feb 2012 19:57:29 DEBUG Requesting libvirt URI default Mon, 06 Feb 2012 19:57:29 DEBUG Received libvirt URI qemu:///system Mon, 06 Feb 2012 19:57:29 DEBUG Requesting virt method 'default', hv type 'kvm'. Mon, 06 Feb 2012 19:57:29 ERROR Host does not support any virtualization options for arch 'x86_64' Mon, 06 Feb 2012 19:57:29 DEBUG Traceback (most recent call last): File "/usr/bin/virt-install-2.7", line 272, in get_virt_type machine=options.machine) File "/usr/lib64/python2.7/site-packages/virtinst/CapabilitiesParser.py", line 732, in guest_lookup {'virttype' : osstr, 'arch' : archstr}) ValueError: Host does not support any virtualization options for arch 'x86_64' hp ~ # virsh --connect qemu:///system Welcome to virsh, the virtualization interactive terminal. Type: 'help' for help with commands 'quit' to quit virsh # capabilities <capabilities> <host> <uuid>604c8a12-cb5b-d911-985d-5404a67ef15d</uuid> <cpu> <arch>x86_64</arch> <model>Westmere</model> <vendor>Intel</vendor> <topology sockets='1' cores='4' threads='2'/> <feature name='rdtscp'/> <feature name='x2apic'/> <feature name='xtpr'/> <feature name='tm2'/> <feature name='est'/> <feature name='vmx'/> <feature name='ds_cpl'/> <feature name='monitor'/> <feature name='pbe'/> <feature name='tm'/> <feature name='ht'/> <feature name='ss'/> <feature name='acpi'/> <feature name='ds'/> <feature name='vme'/> </cpu> <migration_features> <live/> <uri_transports> <uri_transport>tcp</uri_transport> </uri_transports> </migration_features> </host> </capabilities> I have no clue what is going on. I have kvm compiled into my kernel. Normal "kvm" commands are working. Intel VT is enabled in the bios. Any thoughts on this one? Kind regards, Felix Blanke

13 years, 1 month

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[libvirt-users] Creating network bridge without IP address

by Zoltan Lippai

Hi everyone! I have the following setup: domain0 |-domU1 |-domU2 |-domU3 I am running this with libvirt on a XEN server. Right now the server is connected to our office network, but later it will be in a hosted environment. I need domU1 and domU3 to have a public IP, and all of the domUs and the dom0 should have an internal IP address to communicate with each other. So this is what I would like to achieve: domain0 192.168.122.1 |-domU1 192.168.122.2 192.168.1.45 (later this will be changed to the public IP) |-domU2 192.168.122.3 |-domU3 192.168.122.4 192.168.1.46 (this will also be changed to a public IP) On domain0 I have the following network interfaces: br0 Link encap:Ethernet HWaddr 54:04:a6:66:c4:be inet addr:192.168.1.44 Bcast:192.168.1.255 Mask:255.255.255.0 virbr0 Link encap:Ethernet HWaddr 52:54:00:fe:88:0c inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0 This way everything is working fine, except that I don't want domain0 to have a public IP (which is 192.168.1.44 in this case) So is it possible somehow to setup br0 on domain0 without it having an IP address? Thank you, Zoltan Lippai

13 years, 1 month

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[libvirt-users] virsh & vmxnet3 (VMware) VM

by Florent Paillot

Hi, I try to install a VMware VM via virsh with a vmxnet3 network card. Virsh sends me an error : "Insufficient video RAM. The maximum resolution of the virtual machine will be limited to 1176x885. To use the configured maximum resolution of 2560x1600, increase the amount of video RAM allocated to this virtual machine by setting svga.vramSize="16384000" in the virtual machine's configuration file." If I edit the VM settings (via vsphere) and set the Video card memory size to "Auto-dectect video setting" I get the error message : " The task was canceled by a user" when I try to start the VM. If I compare a .vmx generated by vsphere and .vmx generated by virsh I see more lines in the vsphere generated .vmx Is it normal ? Thanks .

13 years, 1 month

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Re: [libvirt-users] qcow2 performance

by Trey Dockendorf

On Mon, Feb 6, 2012 at 2:07 AM, Stefan G. Weichinger <lists(a)xunil.at> wrote: > Am 06.02.2012 03:24, schrieb Trey Dockendorf: >> I wouldn't consider this definitive, but I wrote an article doing >> tests on qcow2 with the variables being preallocation and caching. >> Essentially preallocation + no-cache is the fastest. Article here, >> http://itscblog.tamu.edu/improve-disk-io-performance-in-kvm/. As of >> virt-manager-0.9.0 the only way to generate the qcow2 with >> preallocation is via command line. Details of how are in the article. > > Additional question: > > Doesn't pre-allocation lose its meaning as soon as the image-file is > fully allocated (I mean as soon as it is as big as its maximum size was > defined at start)? > > > Sending response back to list incase someone finds it useful. Preallocation works so that when you create a 100GB image it takes up 100GB from the start. This helps performance because without preallocation the disk would only take up space of whatever is stored on it. So each time you add files the filesystem as to grow the image. With qcow2 the preallocation is just metadata. I've found that ls -lh will show the size correctly but something like "df -h" won't reflect the size of those images, nor will "du -h". - Trey

13 years, 1 month

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[libvirt-users] Network questions

by paul.worner＠thomsonreuters.com

Hi all, When creating a new network: 1) Is there a way to disable automatic spawning of dnsmasq on network creation? I read that leaving out the <DHCP> section should accomplish this, but that is not what I am seeing. 2) Is there a way to disable automatic installation of iptables rules? 3) For that matter, what is the purpose of the default iptables rule set? Doesn't line 3 let all traffic pass anyway? Thanks, Paul Running libvirt 0.9.2 on Ubuntu 11.10 server. Here's the libvirt network config: RAW CONFIG <network> <name>test</name> <bridge name="virbr%d" stp="off" delay="0"/> <forward mode="route"/> <ip address="192.168.0.1" netmask="255.255.255.0"> </ip> </network> COMMAND virsh net-create test.xml RESULTS virsh net-dumpxml test <network> <name>test</name> <uuid>2eff5e7f-847a-1fbf-ec82-01a46ef0f6c2</uuid> <forward mode='route'/> <bridge name='virbr3' stp='off' delay='0' /> <mac address='52:54:00:47:E6:15'/> <ip address='192.168.0.1' netmask='255.255.255.0'> </ip> </network ps aux | grep dns nobody 4391 0.0 0.0 21616 916 ? S 09:45 0:00 dnsmasq --strict-order --bind-interfaces --pid-file=/var/run/libvirt/network/test.pid --conf-file= --except-interface lo --listen-address 192.168.0.1 iptables -L --line-numbers Chain FORWARD (policy ACCEPT) num target prot opt source destination 1 ACCEPT all -- anywhere 192.168.0.0/24 2 ACCEPT all -- 192.168.0.0/24 anywhere 3 ACCEPT all -- anywhere anywhere 4 REJECT all -- anywhere anywhere reject-with icmp-port-unreachable 5 REJECT all -- anywhere anywhere reject-with icmp-port-unreachable

13 years, 1 month

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[libvirt-users] Performance issues with KVM

by Jatin Kumar

Hello, We are using libvirt over KVM. If we run a single virtual machine on a host then the performance is very good but if more than one vm (with 1:1 provisioning) runs on same host the performance is very poor (specially in case of parallel programming). libvirt version: 0.9.2 qemu-kvm-0.14.1 We are using virtio module also. What could be the possible reasons for this behavior. Please tell me if you need more info. -- Jatin

13 years, 1 month

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Users February 2012