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[libvirt-users] Bridge with macvtap problem
by Eduardo 16 Jun '10

16 Jun '10

Hi friends! I'm using libvirt 0.8.1 with qemu-kvm 0.12.4 on Linux 2.6.34. At the moment there are 2 virtual machines running inside that host without problem. They are using the macvtap feature for networking share. But I can't do ping from the host to the guest, but I need this. And whatever communication between them. Ping with other host is normal. Below follows the xml domain definition of one guest: <domain type='kvm' id='2'> <name>vox2</name> <uuid>2e143f6e-5506-8073-c5fc-3ea92fc2b579</uuid> <memory>524288</memory> <currentMemory>524288</currentMemory> <vcpu>2</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/qemu-system-x86_64</emulator> <disk type='file' device='disk'> <source file='/virtual/vox2.qcow2'/> <target dev='sda' bus='scsi'/> <alias name='scsi0-0-0'/> <address type='drive' controller='0' bus='0' unit='0'/> </disk> <controller type='scsi' index='0'> <alias name='scsi0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </controller> <interface type='direct'> <mac address='52:54:00:2f:fe:3d'/> <source dev='eth0' mode='bridge'/> <target dev='macvtap1'/> <model type='virtio'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </interface> <input type='mouse' bus='ps2'/> <graphics type='vnc' port='5901' autoport='no' keymap='pt-br'/> <video> <model type='vmvga' vram='9216' heads='1'/> <alias name='video0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> </devices> </domain> P.S.: The default network of libvirt is disabled. -- *Eduardo Ramos* Asterisk Manager Linux User www.freedominterface.org +55 12 81129581 exten=>eduardo,1,hangup()

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[libvirt-users] howto search this mailing list archive?
by Julian Robbins 16 Jun '10

16 Jun '10

Another quickie I've long and hard (honest !), but can't find a way to search this ml's archives. How do you do this ? -- Kind regards Julian Robbins

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[libvirt-users] apparmor and kvm/libvirt
by Julian Robbins 16 Jun '10

16 Jun '10

Hi After kindly answering my question on snapshots not working whilst vm is on, i find that apparmor is still disturbing the process where snapshots can get written But although i should just be able to disable apparmor for my vm in virt-manager, whilst vm is off; that when i start the vm the apparmor settings go back to being enabled and set to dynamic This is stopping me from taking snapshots again whilst vm is on. :-( I have also tried disabling the apparmor profile for libvirt on the host but this appears to have had no effect. I know very little about appamor and it is not particularly important to be used in this case. I am using Ubuntu 10.04 LTS on both host and guest 64 bit. -- Kind regards Julian Robbins

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[libvirt-users] SCM_RIGHTS file error when attaching device?
by steven765＠yahoo.com 16 Jun '10

16 Jun '10

So I just upgraded to 0.8.1-1 and virt-manager 8.4 when i try to attach my network card that's been perfectly fine in the past i now get... virsh # attach-device gnome /etc/libvirt/qemu/nic.xml error: Failed to attach device from /etc/libvirt/qemu/nic.xml error: internal error unable to send TAP file handle: No file descriptor supplied via SCM_RIGHTS Any thoughts?

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[libvirt-users] How to configure kvm development environment
by Avdhoot Joshi 15 Jun '10

15 Jun '10

Hi, Installed RHEL 5.5 on AMD Opteron. [root@wlng-ppcore-nd3 ~]# uname -a Linux wlng-ppcore-nd3 2.6.18-194.el5 #1 SMP Tue Mar 16 21:52:39 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux [root@wlng-ppcore-nd3 ~]# virsh version Compiled against library: libvir 0.6.3 Using library: libvir 0.6.3 Using API: QEMU 0.6.3 Running hypervisor: QEMU 0.9.1 This is the default version of virsh using libvirt 0.6.3. Downloaded libvirt 0.8.1, configured it as follows: $ configure $ make $ make install What should be done so that virsh uses the latest 0.8.1 libvirtd binary, how to completely stop 0.6.3? I want to execute a program using virDomainMemoryStats which is available only in latest libvirtd. Thanks, Avdhoot

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Re: [libvirt-users] Problems moving qemu machine to libvirt
by Gunnar Thielebein 15 Jun '10

15 Jun '10

Hi Erik, thanks for the solution provided. I tried that but unfortunately it spits out this error message: > Traceback (most recent call last): > File "/usr/share/virt-manager/virtManager/engine.py", line 588, in run_domain > vm.startup() > File "/usr/share/virt-manager/virtManager/domain.py", line 150, in startup > self._backend.create() > File "/usr/lib/python2.6/dist-packages/libvirt.py", line 300, in create > if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self) > libvirtError: internal error cannot parse QEMU version number in '' Looks to me that libvirt does some version checks with the emulator-node and don't get reliable output. The wrapper script: /etc/libvirt/kvmvde: > #!/bin/bash > exec /usr/bin/kvm "$@" \ > -net nic,vlan=0,model=virtio,macaddr=52:54:61:44:21:23 \ > -net vde,vlan=0,group=libvirtd,mode=0770,sock=/var/run/vde.ctl The xml section: ... > <devices> > <emulator>/etc/libvirt/kvmvde</emulator> > <disk type='file' device='disk'> > <source file='/var/lib/libvirt/images/vlxp01-gt/tmp7Jiyzz.qcow2'/> > <target dev='hda' bus='ide'/> > </disk> ... Btw. is the bridge entry really necessary in the xml file? I wonder if this wouldn't also work, but I am not at this step, currently: => http://libvirt.org/formatdomain.html#elementsNICSSlirp "Generic ethernet connection" > ... > <devices> > <interface type='ethernet'/> > ... > <interface type='ethernet'> > <target dev='vnet7'/> > <script path='/etc/qemu-ifup-mynet'/> > </interface> > </devices> > ... Perhaps this is a place to also start the vde hub? On 10.06.2010 13:34, Erik de Castro Lopo wrote: > #!/bin/bash > exec /usr/bin/kvm $@ \ > -net nic,vlan=0,model=rtl8139,macaddr=52:54:61:44:21:23 \ > -net vde,vlan=0,group=vde2-net,mode=0770,sock=/var/run/kvm-vde-ctl Any reason no to use the virtio driver? Best, Gunnar

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[libvirt-users] Functionality of virsh net-edit
by Arseny Klimovsky 15 Jun '10

15 Jun '10

Hi, I am using version libvirt on debian lenny from backports repository, version 0.7.6-1~bpo50+1, amd64. Th functionality of "virsh net-edit" command is not very clearly documented, and I think it should change a configuration of a running network. But I see it doesn't. So, I want to add new host, for example: #I have old configuration root@xxx:/etc/libvirt/qemu/networks# virsh net-edit default Network default XML configuration edited. #Here I added new line: new host definition root@xxx:/etc/libvirt/qemu/networks# cat default.xml #Here I see that new line root@xxx:/etc/libvirt/qemu/networks# virsh net-dumpxml default root@xxx:/etc/libvirt/qemu/networks# virsh net-edit default #Here I see exactly the old network definition Is this behaviour expected? If yes, how to just add new host on a running network? -- Arseny Klimovsky

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[libvirt-users] Documentation Bug: struct virSchedParameter missing value field
by Guido Winkelmann 14 Jun '10

14 Jun '10

Hi, The libvirt documentation under http://libvirt.org/html/libvirt-libvirt.html#virSchedParameter fails to list the "value" member, even though that is kind of essential for using the struct. This is what the documentation says: struct virSchedParameter{ charfield[VIR_DOMAIN_SCHED_FIELD_LENGTH] field : parameter name int type : parameter type } This is how it looks in the actual header file: typedef struct _virSchedParameter virSchedParameter; struct _virSchedParameter { char field[VIR_DOMAIN_SCHED_FIELD_LENGTH]; /* parameter name */ int type; /* parameter type */ union { int i; /* data for integer case */ unsigned int ui; /* data for unsigned integer case */ long long int l; /* data for long long integer case */ unsigned long long int ul; /* data for unsigned long long integer case */ double d; /* data for double case */ char b; /* data for char case */ } value; /* parameter value */ }; This one had me scratching my head for a while, because the way it is documented, it's absolutely not clear how the struct is supposed to be used. Only after studying the virsh source code for a while did I notice that this struct apparently has more members than the documentation lets on... Guido

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[libvirt-users] Missing target dev for interface
by jeremy avnet 11 Jun '10

11 Jun '10

I have over 20 guests running on a particular host and the three longest running ones are missing the network device information in their XML description: <interface type='network'> <mac address='54:52:10::f2:c5'/> <source network='local'/> </interface> Compared to the others which have: <interface type='network'> <mac address='54:52:d1:32:0a:a1'/> <source network='local'/> <target dev='vnet13'/> </interface> This is problematic as I wanted to use domifstat on the domains. Using the packet counts shown via ifconfig on the host, I was able to determine what the vnet interface should be, but passing that to domifstat doesn't work: $ virsh domifstat maki221 vnet13 Connecting to uri: qemu:///system error: Failed to get interface stats guest19 vnet13 error: invalid argument in invalid path, 'vnet13' is not a known interface How did this happen? Is there a way I can get libvirt to know about the interfaces? And the guest OS's network connections work fine. Thanks! .:. jeremy

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[libvirt-users] Multipath pools - practical for use?
by Justin Clift 10 Jun '10

10 Jun '10

Hi all, Writing up some Fedora documentation, and looking to figure out the best way of mapping multipath network(!) LUNs to pools in libvirt. ie Infiniband SRP LUNs, but would probably apply to Fibre Channel equally as well. There are two approaches I can think of easily: a) Large LUNs (ie TB+) that are mapped to a host server as disk, with each LUN being configured as an LVM pool. This lets the host slice the pool up into volumes with the libvirt volume creation commands. b) Pre-purposed LUNs mapped to a host server as disk, but passed through directly to their respective guests. ie Something like Oracle, with 3 SAN LUNs mapped to guest FOO for its database data In a non-libvirt world I'd look at configuring the LUNs on the host with persistent name using multipath, then present them appropriately to whatever needs them from there. However, libvirt has a pool type called "multipath". Looking at the docs online, it doesn't appear to be all that fully featured at this point. Seems more of a brief mention and footnote, so I'm wondering whether to use it or skip it for now in the Fedora docs. Anyone have thoughts/suggestions/etc? :) Regards and best wishes, Justin Clift -- Salasaga - Open Source eLearning IDE http://www.salasaga.org

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