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[libvirt-users] libvirt doesn't boot kVM, hangs, qemu on 100% CPU
by Igor Galić 23 Feb '12

23 Feb '12

Hi folks, it's been adventurous. Yesterday night I've started debugging this particular issue of why my KVMs don't boot on Ubuntu 11.10. A first hint was apparmor, which seemed to deny access to the LVM partitions I had assigned as disks. After correctly configuring apparmor, or even disabling it the issue was still the same. After a wild goose chase, I decided to update everything, I now have * libvirt 0.9.8 (built from Ubuntu 12.04 sources) * qemu 1.0 (built from Ubuntu 12.04 sources) * SeaBIOS (built from git master: pre-1.6.4-20120221_203841) I even installed sgabios to see what's going on without having to connect with virt-manager every time. So what's going on? What am I trying to do? I'm trying to boot an Ubuntu amd64 VM, which looks pretty much the same as the Ubuntu host, except that I uninstalled libvirt and qemu-kvm, which felt out of place. This I'm trying to accomplish by booting it with the host's kernel and initrd (os/kernel and os/initrd). So much for the starting conditions. You can find my configuration here: http://sprunge.us/gCVj (I'm attaching it just in case the pastebin goes stale). The first thing that is slightly irritating is that it doesn't validate: """ Relax-NG validity error : Extra element kernel in interleave web.xml:9: element kernel: Relax-NG validity error : Element os failed to validate content web.xml:8: element type: Relax-NG validity error : Error validating value web.xml:8: element type: Relax-NG validity error : Element type failed to validate content web.xml:1: element domain: Relax-NG validity error : Invalid sequence in interleave web.xml:1: element domain: Relax-NG validity error : Element domain failed to validate content web.xml fails to validate """ Interestingly, even if I remove some of the elements that `virt-xml-validate` complains about via `virsh edit`, next time I `edit`, or `dumpxml` it'll be back in place. With sgabios in place, I can fortunately just c/p to show you what a boot looks like: """ SeaBIOS (version pre-1.6.4-20120221_203841-bacon) iPXE (http://ipxe.org) 00:03.0 C100 PCI2.10 PnP PMM+001C9B80+00189B80 C100 iPXE (http://ipxe.org) 00:04.0 C200 PCI2.10 PnP PMM 001C9B80 00189B80 C200 Booting from ROM... """ And that's it. And that's wrong. But I can't seem to figure out how and why. I'll be hugely in debt for your help and welcome any suggestions, ready to provide as much information as you need to solve this issue. So long, i -- Igor Galić Tel: +43 (0) 664 886 22 883 Mail: i.galic(a)brainsware.org URL: http://brainsware.org/ GPG: 6880 4155 74BD FD7C B515 2EA5 4B1D 9E08 A097 C9AE

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[libvirt-users] [libvirt] a question about sanlock
by Alex Jia 22 Feb '12

22 Feb '12

Hi Daniel, I got a question about lock manager, if I enable 'sanlock' in qemu.conf and uncomment 'auto_disk_leases = 1' in qemu-sanlock.conf then restart libvirtd service, libvirtd will be dead, I know I should also uncomment 'host_id = 1' in qemu-sanlock.conf, because I enable 'auto_disk_leases'. The question is the libvirtd must die due to a error users configuration? or could we give some warning information instead of libvirtd die? Thanks & Regards, Alex

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[libvirt-users] libvirt -user'question
by 冰淇淋 21 Feb '12

21 Feb '12

hi,: I am a new user of libvirt ,I asked a question about using libvirt to connect to esxi server. I got the answer is https://www.redhat.com/archives/libvir-list/2012-February/msg00860.html So,I try to make the change on the mailing list you just added. - * Add a dummy expect header to stop CURL from waiting for a response code + * Add an empty expect header to stop CURL from waiting for a response code - curl->headers = curl_slist_append(curl->headers, "Expect: nothing"); + curl->headers = curl_slist_append(curl->headers, "Expect:"); and I did the follow steps in my computer: 1../configure --with-esx 2.make 3.make install 4../autogen.sh --prefix=$HOME/usr 5.make 6.make install I complete installing the libvirt and run the command :virsh --version ,get the right answer 0.9.7 and I run the command :virsh -c esx://me@exampe.com/?tansport=http the error before I mentioned related to http did disappeared ,but and I still get a error like:error: internal error XPath evaluation of response for call to 'RetrieveServiceContent' failed I don't understand what does this error mean,or is my steps wrong ?so I hope you can help me to figure out the promble. thanks a lot and so sorry for trouble you too much .waiting for you reply on line. ps: I have another question about libvirt , I saw this :%if %{with_esx}%if 0%{?fedora} >= 9 || 0%{?rhel} >= 6 in /libvirt0.9.7/livirt.spec,I want to know if libvirt esx driver only can be useful on fedora>=9||rhel>=6,and the other OS like centos 6.0 or redhat ,will disable the use of esx driver of libvirt. thanks again. best regards! ------------------ 原始邮件 ------------------ 发件人: "Matthias Bolte"<matthias.bolte(a)googlemail.com>; 发送时间: 2012年2月21日(星期二) 凌晨5:44 收件人: "冰淇淋"<453193368(a)qq.com>; 抄送: "libvirt-users"<libvirt-users(a)redhat.com>; 主题: Re: [libvirt-users] the probelm in using libvirt to connect esx server 2012/2/20 冰淇淋 <453193368(a)qq.com>: > hi, > I am a new user of libvirt ,i really appreciate libvirt，and want to use it > in my work.I want to use it to conncet to a ESXi server.when I try to > connect to the server ,I use the command :virsh -c > esx://name@exmaple.com,And I get an > > 1.error :error: internal error curl_easy_perform() returned an error: > Couldn't connect to server (7) : couldn't connect to host > so I think maybe the firewall shutdown the 443 for https,so I used > command:virsh -c esx://name@example.com/?transport=http And I still get an > error like: > error: internal error HTTP response code 417 for call to > 'RetrieveServiceContent' > error: failed to connect to the hypervisor HTTP error code 417 is related to the Expect header. The error indicates that the server or a proxy in between doesn't handle the Expect header. I assume that the ESXi sever itself is not the problem, because it works for me here. Maybe there is a HTTP proxy between your computer and the ESXi server that returns this 417 error code. This problem is probably related to libvirt sending a dummy Expect header instead of sending no Expect at all. If you're building libvirt from source you can try this patch that I just send to the mailing list for review https://www.redhat.com/archives/libvir-list/2012-February/msg00860.html It fixes the Expect header problem and might fix your connection problem. -- Matthias Bolte http://photron.blogspot.com </:includetail>

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[libvirt-users] the probelm in using libvirt to connect esx server
by 冰淇淋 20 Feb '12

20 Feb '12

hi, I am a new user of libvirt ,i really appreciate libvirt，and want to use it in my work.I want to use it to conncet to a ESXi server.when I try to connect to the server ,I use the command :virsh -c esx://name@exmaple.com,And I get an 1.error :error: internal error curl_easy_perform() returned an error: Couldn't connect to server (7) : couldn't connect to host so I think maybe the firewall shutdown the 443 for https,so I used command:virsh -c esx://name@example.com/?transport=http And I still get an error like: error: internal error HTTP response code 417 for call to 'RetrieveServiceContent' error: failed to connect to the hypervisor so ,I still can't find the way to connet the server,if you kown how to handle this problem ,i hope you can help me thanks a lot. i will wait for you letter day and night. Best regards

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[libvirt-users] Error deleting a volume
by Bo Bo 17 Feb '12

17 Feb '12

Hello group. This is my first post here so first of all I'd like to greet everybody reading this group. Secondly, I have a problem with libvirt used from a perl script. I would like to undefine a domain and afterwards delete the volume that had been attached to the domain as a disk. The volume is a qcow2 file and is placed in a 'dir' type pool. I succeed in undefining the domain but trying to delete a volume using $vol->delete() crashes the libvirtd. The script catches an exception: libvirt error code: 38, message: server closed connection and the init process echoes an entry to the log: init: libvirt-bin main process (6999) killed by ABRT signal When I try to list volumes afterwards using virsh, I see that not only the volume, but also the pool are missing. Moreover the pool that holds a backing storage for the qcow2 file is also missing. It seems that the delete operation actualy succeeds because the file gets deleted from disk as well. Fortunately the backing storage file is still present on the disk although its pool in virsh disappears. Has anybody come across a similar problem before? Any help is highly appreciated. Best regards Bogdan Katynski

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[libvirt-users] Detecting Co-residency of VMs on KVM
by Shikhar Agarwal 16 Feb '12

16 Feb '12

I am doing an experiment which involves detecting co-resident VMs (testing if 2 VMs are on the same physical machine) on KVM. I have tried using cache covert channel, but this test does not work if the VMs are on different processors within the same host as the caches are not shared then. If I use the tools netperf and iperf to differentiate using network channels, I am not getting clear results. This is because the network is really good (10 Gbps). I believe there are better and more reliable ways for the same. Please suggest some of these. The idea is to find some resource (like memory, disk, etc) that is shared by the VMs and try to run some benchmarks that thrash this resource. Another idea is to take advantage of some optimization that kvm might be doing internally. Please help me. Thank you Shikhar Agarwal Undergraduate Senior IIT-Delhi

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[libvirt-users] Detach devices using Libvirt+Xen
by Daniel Espling 16 Feb '12

16 Feb '12

Hi! We're struggling to get device detaching to work reliably using Xen. We can reliably use the same code to manage devices using Libvirt+KVM without any problems. We've tested this on Xen with both CD-ROM and USB devices without success. See below for detailed descriptions. Thankful for any help! Regards, Daniel Espling --- For CD-ROM, we can mount them using attach-device but cannot remove them using the correspoding call to detach-device: cdrom7.xml contains: <disk type='file' device='cdrom'> <driver name='file' type='raw'/> <source file='/opt/diskimages/test7.iso'/> <target dev='hdc' bus='ide'/> <readonly/> </disk> eject.xml contains: <disk type='block' device='cdrom'> <driver name='file'/> <target dev='hdc' bus='ide'/> <readonly/> </disk> cdrom8.xml is identical to cdrom7.xml apart from the .iso file used. # virsh attach-device deb cdrom7.xml Device attached successfully # virsh detach-device deb cdrom7.xml error: no such device in deb # virsh attach-device deb eject.xml error: Failed to attach device from eject.xml error: POST operation failed: xend_post: error from xen daemon: (xend.err 'Device 5632 not connected') # virsh update-device deb cdrom8.xml --persistent error: Failed to update device from cdrom8.xml error: POST operation failed: xend_post: error from xen daemon: (xend.err 'Device 5632 not connected') dumpxml shows the cdrom device attached exactly as it's defined in the xml. Using virsh we're able to use "virsh detach-disk deb hdc" to unmount the CD-ROM, but we need to be able to do this using the python API. We cannot find a corresponding call to detach-disk and we therefore have to rely on detach-device instead, right? Are there any flags we can use for detachDeviceFlags() to replicate the functionality of detach-disk? ---- Similarly for USB devices, we can mount them OK but not remove them using the corresponding call to detach-device. Calling detach-disk works, but again we need to find the corresponding call for this function using the python API. One thing we've found with mounting USB devices is that they seem to be mounted on the SCSI bus instead of the USB one as specified: Example: usb7.xml contains: <disk type='file' device='disk'> <driver name='file' type='raw'/> <source file='/opt/diskimages/test7.iso'/> <target dev='sda' bus='usb'/> <readonly/> </disk> dumpxml shows: <disk type='file' device='disk'> <driver name='file'/> <source file='/opt/diskimages/test7.iso'/> <target dev='sda' bus='scsi'/> <readonly/> </disk> # virsh attach-device deb usb7.xml Device attached successfully Test attaching again (expected to fail): # virsh attach-device deb usb7.xml error: Failed to attach device from usb7.xml error: Requested operation is not valid: target 'sda' already exists `-testgrid7.leeds.ac.uk /opt/recontext # virsh detach-device deb usb7.xml error: no such device in deb ---- Relevant info: Compiled against library: libvir 0.9.9 Using library: libvir 0.9.9 Using API: Xen 0.9.9 Running hypervisor: Xen 4.0.0 Running CentOS 5.5 (final) Linux 2.6.32.24 #3 SMP Fri Oct 29 16:22:02 BST 2010 x86_64 x86_64 x86_64 GNU/Linux

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[libvirt-users] qcow2 performance
by Stefan G. Weichinger 15 Feb '12

15 Feb '12

Greets, I have to research performance-issues of a W2003-VM within KVM. Right now it's a qcow2-image-file w/ default settings within libvirt (configured by vmm ...) My question: what caching to use? writeback/writethrough/etc ... what to use for data integrity while not getting ultraslow performance? Found https://www.linuxfoundation.jp/jp_uploads/JLS2009/jls09_hellwig.pdf Is there any other list/doc what to use and why? Thanks, Stefan

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Re: [libvirt-users] [libvirt] Fail to import available VM image
by Laine Stump 15 Feb '12

15 Feb '12

On 02/14/2012 11:01 AM, Jun Koi wrote: > On Tue, Feb 14, 2012 at 11:47 PM, Alex Jia <ajia(a)redhat.com> wrote: >> Hi Jun, >> I assume you haven't changed libvirt default URI, it may be a issue, >> I want to know whether it works for you if you explicitly specify >> --connect qemu:///system with virt-install? I think a root reason >> probably is your disk image location, the log said it can't find >> storage volume, if you put img.winp under the /var/lib/libvirt/images, >> then give a disk absolute path to virt-install, Does it work for you? > ok, i change the command a bit, and it went further. > here is how i did: > > (1) compiled everything from source, then install (make install) to my Ubuntu > > (2) start libvirtd on commandline > # libvirtd -d > > (3) import my KVM image to libvirt > > $ virt-install --connect qemu:///system -n winxp -r 800 --accelerate > --vnc -v --noautoconsole --import -f /home/jun/img/img.winxp > > it failed, and the log is like below: > > .... > [Tue, 14 Feb 2012 23:51:49 virt-install 3831] DEBUG (cli:326) > Requesting libvirt URI qemu:///system > [Tue, 14 Feb 2012 23:51:51 virt-install 3831] DEBUG (cli:328) Received > libvirt URI qemu:///system > [Tue, 14 Feb 2012 23:51:52 virt-install 3831] DEBUG (virt-install:259) > Requesting virt method 'hvm', hv type 'default'. > [Tue, 14 Feb 2012 23:51:52 virt-install 3831] DEBUG (virt-install:469) > Received virt method 'hvm' > [Tue, 14 Feb 2012 23:51:52 virt-install 3831] DEBUG (virt-install:470) > Hypervisor name is 'kvm' > [Tue, 14 Feb 2012 23:51:52 virt-install 3831] ERROR (cli:439) Error in > network device parameters: Virtual network 'default' has not been > started. > [Tue, 14 Feb 2012 23:51:52 virt-install 3831] DEBUG (cli:440) > Traceback (most recent call last): > File "/usr/local/lib/python2.6/dist-packages/virtinst/cli.py", line > 884, in get_networks > dev = parse_network(guest, netstr, mac=mac) > File "/usr/local/lib/python2.6/dist-packages/virtinst/cli.py", line > 1642, in parse_network > bridge=opts.get("bridge")) > File "/usr/local/lib/python2.6/dist-packages/virtinst/VirtualNetworkInterface.py", > line 153, in __init__ > self.network = network > File "/usr/local/lib/python2.6/dist-packages/virtinst/XMLBuilderDomain.py", > line 309, in new_setter > fset(self, val, *args, **kwargs) > File "/usr/local/lib/python2.6/dist-packages/virtinst/VirtualNetworkInterface.py", > line 257, in set_network > "started.") % newnet) > ValueError: Virtual network 'default' has not been started. A very common cause of this problem is that a systemwide instance of dnsmasq is already (erroneously) listening on the bridge created by libvirt for the default network. I took your email as an oppurtunity to write an entry in the new Troubleshooting section of the libvirt wiki. It will explain to you how to solve your problem (*if* this is your problem, of course :-). http://wiki.libvirt.org/page/Virtual_network_%27default%27_has_not_been_sta… If that ends up not being your problem, please reply to this message, but sending the reply to libvirt-users(a)redhat.com (I also Cc'ed this message there) rather than to libvir-list(a)redhat.com. (The former is the official list for user questions about libvirt, whil libvir-list is intended for for people discussing the code.) > i guess perhaps just starting "libvirtd -d" on commandline is not > enough. do i need a script to configure and start libvirtd properly > for me? > and it seems i must configure the virtual network somehow? The "default" network should already be there as part of the stock install.

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[libvirt-users] QEMU hook on restore
by Székelyi Szabolcs 13 Feb '12

13 Feb '12

Hi, I'm using libvirt 0.8.3. It looks like to me that when a QEMU domain is restored from save, the hook is called with the "stopped end -" arguments. I've also noticed that the domain description passed to the hook script doesn't contain the network device the host will be attached to (XPath: /domain/devices/interface/target/@dev). Are these a bugs or a features? Thanks, -- cc

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