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[libvirt-users] Understanding 802.1Qbh networking
by Chris Picton 24 Aug '12

24 Aug '12

Hi All I am experimenting with a system comprising Cisco UCS Blades and Nexus 5k switches. I am trying to understand the best way to define network interfaces for my vms, without having to specify exact source device names or PCI addresses, as I want to be able to migrate vms between nodes and not have to worry about namespace or pcispace collisions. At the moment my network definition looks like: <interface type='direct'> <mac address='52:54:00:c0:cb:2a'/> <source dev='eth55' mode='private'/> <virtualport type='802.1Qbh'> <parameters profileid='TestKVMProfile'/> </virtualport> <model type='virtio'/> <driver name='vhost'/> </interface> libvirt added a few extra settings when I added it: <target dev='macvtap0'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> The issue I have with this config is that I am specifying a source dev (eth55), which I would have to keep manual track of across all vms in my infrastructure. Is there a way to use a high-speed virtual network interface, which is created on the fly for the vm, and supports migration cleanly to another kvm host (ie, does not rely on any specific host resource names). Sorry for any confusion caused from my lack of understanding :) Thanks Chris -- Chris Picton Executive Manager: Systems Cell: 082 339 3135 Email: chris(a)nashua-ecn.com Tel: 087 940 0031 Fax: 087 940 0001 Nashua ECN is a Division of Reunert Limited (Reg. No. 1913/004355/06). The contents of this e-mail, which may include one or more attachments, is strictly confidential, and is intended solely for the use of the named recipient(s). If you have received this e-mail in error, you are not permitted to and must not disclose, distribute, or retain it, and are requested to please notify the sender immediately by return e-mail and delete it thereafter.

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[libvirt-users] Libvirt Seg Fault when compiling either 0.9.13 or 0.10.0-rc1
by Shawn Furrow 23 Aug '12

23 Aug '12

Hi all, I am trying to install a version of Libvirt that will be compatible with qemu-kvm-1.1 but I cannot seem to get Libvirt to compile. During the make portion of the install I get the following error: ... make[4]: Entering directory `/home/shawn/libvirt-0.10.0/docs' Generating 404.html.tmp /bin/bash: line 5: 59204 Segmentation fault /usr/bin/xsltproc --stringparam pagename $name --nonet --html ../docs/site.xsl 404.html.in > 404.html.tmp make[4]: *** [404.html.tmp] Error 1 make[4]: Leaving directory `/home/shawn/libvirt-0.10.0/docs' ... I have tried using "./configure --without-xen" and "./autogen --without-xen" for the configure step and then I run make (and get the seg fault error) This error happens for both 0.9.13 and 0.10.0-rc1 so I'm pretty sure its something on my end just don't know what. I am using Ubuntu 10.04 Server and qemu-kvm-1.1. I have been able to get the qemu-kvm and libvirt-bin distribution packages to work together but now I'm trying to build both of them from source so that I can make some modifications to the source code. Any help is appreciated. Thanks, Shawn -- Virginia Tech Bradley Department of Electrical and Computer Engineering B.S. Electrical Engineering B.S. Computer Engineering

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[libvirt-users] libvirt networking
by Dale Amon 23 Aug '12

23 Aug '12

Did something happen in the last day or two that would have screwed up libvirt networking? I just started up a VM that I last ran on Sunday and it has suddenly developed issues with communication with the host machine. Call it VM1 and VMHOST (the libvirt network) and VMHOST_EXT VM1 ping -> Internet works VM1 ssh -> Internet works VM1 ping -> VMHost single ping goes through VM1 ssh -> VMHost works VMHOST_EXT ping -> VM1 works VMHOST_EXT ssh -> VM1 fails The only things that have changed were Ubuntu security updates to VMHOST (It is an Oneiric). The VM1 is intentionally kept unchanging to avoid breaking some software which will not work on newer releases (jaunty). Again, I was using the VM and mounting fs from VMHOST on it as recently as Sunday. Either there is something deep inside Ubuntu that has gotten deeply confused or someone has released an update that breaks things.

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Re: [libvirt-users] automatically detaching PCI host devices from guest for SRIOV usage.
by Rajesh Kumar Mallah 23 Aug '12

23 Aug '12

| Dear Alex , | | What logging level is useful for you ? | | Dear Rajesh, | | Level 1 (Debug) should be enough, but I guess it probably hasn't more | help for us, you had better to login the guest then check network when you were | meeting this issue again, for example, to check if network configuration is valid and try | to restart relevant network services to see if the guest network can work again | or something like that, In addition, you shut down the guest via running 'halt' in | the guest,| Does it work for you if you use libvirt relevant interface such as | 'virsh shutdown guest' | or 'virsh destroy guest'? Dear Alex , The Guest is a minimal debian squeeze install without any GUI desktop in it . Below is the relevant /etc/network/interfaces file. # The loopback network interface auto lo iface lo inet loopback # The primary network interface allow-hotplug eth0 auto eth0 iface eth0 inet static address 192.168.101.11 netmask 255.255.0.0 gateway 192.168.1.1 ------------------------- end of interfaces file ---------------- the allow-hotplug on eth0 allow network to be automatically configured once the attach-device is done. similarly detach-device is handled gracefully. Before posting we have done multiple permutations and combinations of many config parameters and activities. This includes shutting down the guest via 'halt' and 'destroy|shutdown' from the virsh interface. It does not help or makes difference. Most surprisingly there is no alarming messages that are shown in any of the logs , be it the syslog of host or syslog of guest, I have however not seen the libvirtd.log in debug mode which i shall do in a while. I would also like to tell that the issues was discussed in the intel forum but no conclusive solution could be found. The link is: http://communities.intel.com/message/164211#164211 I am sorry for the bit late response but i assure my continued feedback regarding this issue. We are working on a test (spare) hardware and it is easy for us to test any configuration or patches The platform is : SuperMicro AMD Opteron Hardware , with IOMMU and SRIOV enabled , intel 82599EB based dual SFP+ port , linux kernel 3.5.1 from kernel.org. Regds mallah | | | Regards, | Alex | | | | Regards, | Rajesh Kumar Mallah | Tel. 91-11-46710500 (Ext:303) | Cell +919811255597 | Website: http://www.tradeindia.com/ | \|/ \|/ \|/ stop printing \|/ \|/ \|/ | | | | start planting | | |

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[libvirt-users] libvir: Domain Config error : internal error incorrect root element
by 何鑫 22 Aug '12

22 Aug '12

hi, When I use dom = virDomainDefineXML(conn, xml) to define xml, I countered a problem that " libvir: Domain Config error : internal error incorrect root element". Could you please tell me what's wrong with it? I tend to debug such problem above by gdb to step into virDomainDefineXML. When I press "step" in gdb, the console just shows the wrong messages, so I fail to access to the internal function of virDomainDefineXML. My libvirt's version is 0.98 allowing debug with the command "CFLAGS = -g -O2" in libvirt's Makefile. I installed libvirt-bin by "sudo apt-get install libvirt-bin"in ubuntu. Is there something wrong in my installing steps? Thanks a lot! Best Regards, Corey

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[libvirt-users] virsh command vol-upload purpose question
by Li, Chun Wen 22 Aug '12

22 Aug '12

I use virsh vol-upload to upload some data in a volume and use vol-download to download these data from the same volume, both these two commands work well. However, when I first use these two commands, I thought I can use vol-upload to upload some file, then attach this volume to a vm, and access the upload file in this vm. I did this experiment, bud it not success. Once I upload a file into a volume, attach it to a vm, then the vm can not recognize the file type of this vm, if I mkfs to the volume, the file I upload disappear. So, my question is the purpose of the vol-upload is just to save some data in the volume outside vm? And at this point do we have method to access the data upload to the volume from vm? Thanks Bests Kimi Li

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[libvirt-users] What can cause "libvirtd dead but pid file exists."
by xuanmao_001 22 Aug '12

22 Aug '12

Hi, Eric: I noticed that: # service libvirtd status libvirtd dead but pid file exists. I operated VMs(like create, edit, delte) normally for a second, but the libvirtd on host was dead. I checked the libvirtd.log but didn't find any useful information. so I want to know what can cause the problem? another question: I found the message in /var/log/message like "libvirtd: Could not find keytab file: /etc/libvirt/krb5.tab: Permission denied." what is going wrong? my libvirt version: 0.9.8. thanks. xuanmao_001

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[libvirt-users] Finding cause when "virsh list" hangs
by Whit Blauvelt 22 Aug '12

22 Aug '12

Hi, Did something dumb - had two VM hosts with DRBD mirroring of VMs on the same UPS, which failed and crashed them both. While I've got VMs running now on both, "virsh list" and "virsh start" and so on are just hanging. I'm not seeing it log anything in these instances - just hanging. Both systems are Ubuntu 10.10, one with the stock libvirtd 0.8.3 and one with 0.9.12 compiled from source. They each brought up their autostart VMs okay. But I've got no working virsh shell on either now. The 0.9.12 host was, to complicate this report, okay with virsh initially, or "virsh list" anyway. But it hung with a "virsh start," and now "virsh list" fails too. So ... what should I look for to have been left where by the crash that's making virsh hang? Is there any way to get virsh to provide debugging info in a coffee-addled-friendly way? I've of course Googled "virsh list" hanging, but without finding anything that seems to directly apply to my case, although it's been seen before. Thanks, Whit

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[libvirt-users] disappeared VM in virsh
by Akendo 21 Aug '12

21 Aug '12

Hi guys, one of my VM has disappeared in libvirtd. I still can see the process with ps and the configuration file is as well there. But it is not displayed or found with virt-manger/virsh. virsh list shows only 4 of 5, but there is no real error message. I restarted the daemon without solving the problem. Any idea what to do? Here some info: Compiled against library: libvir 0.9.13 Using library: libvir 0.9.13 Using API: QEMU 0.9.13 Running hypervisor: QEMU 0.12.1 uname -a Linux 2.6.32-220.17.1.el6.x86_64 #1 SMP Wed May 16 00:01:37 BST 2012 x86_64 x86_64 x86_64 GNU/Linux It's a CentOS 6 so far Akendo

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[libvirt-users] Libvirt Qemu compatibility
by Shawn Furrow 21 Aug '12

21 Aug '12

Hi all, I am using Ubuntu 10.04 Server and I am trying to figure out which versions of qemu-kvm and libvirt are known to work well together and if there is anything special that needs to be done during their installs. I am trying to work with the latest version of libvirt possible that will be stable with qemu-kvm. Right now, the only configuration I've been able to get working are the "libvirt-bin" and "qemu-kvm" distribution packages. However, I would like to at least install libvirt from source because I want to have access to the source code and make minor changes. Thanks, Shawn -- Virginia Tech Bradley Department of Electrical and Computer Engineering B.S. Electrical Engineering B.S. Computer Engineering

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