July 2012 - Users - libvirt List Archives

[libvirt-users] Metadata accessible within guests
by Renich Bon Ciric 09 Jul '12

09 Jul '12

Hello, I'd like to know if there is any way to make metadata; for example, the public part of an SSH, accessible within a Guest? This would be very useful in order to provide access to Guests in an automated way. For example, let's suppose I have an implementation that gives a user the power to create Guests. The user has stored his public SSH key in my implementation. After the user creates a Guest, I can inject (with a proper rc.local script or something of the sorts) his/her SSH key properly. This would be useful for a million things. Another cool feature would be that I could sync the root password with the SPICE/VNC password. anyway, if there is a way to store metadata into an XML and, maybe, access it with some tool from within the Guest, this would be awesome. Thank you for your time. -- It's hard to be free... but I love to struggle. Love isn't asked for; it's just given. Respect isn't asked for; it's earned! Renich Bon Ciric http://www.woralelandia.com/ http://www.introbella.com/

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[libvirt-users] Why the xen vm memory won't bloon
by Tony Huang 09 Jul '12

09 Jul '12

Hello, I have a vm with startup xml file has currentmemory = 256M and memory=1024M. However, once the vm started up, the memory allocation won't change. xentop shows that the memory keeps in 256M. How can I make the vm to allocate more memory when they needed. -- Tony

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[libvirt-users] CPU usage by libvirtd
by Zhihua Che 06 Jul '12

06 Jul '12

Hi, I employed libvirt to monitor 50 domains in one node(host). my monitor calls libvirtd for every stats such as cpu, memory, disk every 10 sec. All my requests are made in one thread. And I found that the libvirtd may cost 30% or above cpu time. Is it normal in my case? I tried to reduce this cpu consumption and found some variable in libvirtd.conf and got a little confused by variables like max_clients, max_workers, max_requests. In my opinion, max_clients limits the number of virConnect created by app. max_workers limits the number of thread to handle requests from clients. Does that mean requests from one client may be handled in multi-thread way if max_workers is greater than max_workers? max_request limits the concurrent RPC calls according the comments in libvirtd.conf. I wonder if it can improve the response time if I give a higher value in the case that all my requests are made in one thread? I've tried several different configurations and they didn't reduce the cpu usage effectively.

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[libvirt-users] Problem halting/restaring a lxc container from within
by david＠dit.upm.es 05 Jul '12

05 Jul '12

Hi, I've been making some tests with libvirt and LXC and found some problems when halting/restarting a LXC container from within. Basically, on a Ubuntu 12.04 system with libvirt installed as package (0.9.8), I've created a basic container image with: lxc-create -t ubuntu -n lxc And started it using the libvirt XML listed below and the following command: virsh -c lxc:// create lxc.xml I can access the container console normally but when I issue a halt or reboot command from inside, the container initiates the halt/reboot execution but it does not finishes it properly. For example: $ sudo halt -p [sudo] password for ubuntu: Broadcast message from ubuntu@my-container (/dev/pts/0) at 23:19 ... The system is going down for power off NOW! ubuntu@my-container:~$ acpid: exiting * Asking all remaining processes to terminate... [ OK ] * All processes ended within 1 seconds.... [ OK ] * Deconfiguring network interfaces... [ OK ] * Deactivating swap... [fail] * Unmounting weak filesystems... [ OK ] umount: /run/lock: not mounted mount: / is busy * Will now halt The container seems to finish the shutdown process but libvirt does not seem to be signaled about it (virsh shows the container is still executing). Something similar happens with reboot. However, if a start that container with: lxc-start -n lxc and do the same test, it works perfectly: # sudo halt -p [sudo] password for ubuntu: Broadcast message from ubuntu@my-container (/dev/lxc/console) at 23:17 ... The system is going down for power off NOW! ubuntu@my-container:~$ acpid: exiting * Asking all remaining processes to terminate... [ OK ] * All processes ended within 1 seconds.... [ OK ] * Deconfiguring network interfaces... [ OK ] * Deactivating swap... [fail] umount: /run/lock: not mounted mount: cannot mount block device /dev/disk/by-uuid/9b50a43d-98c3-45ad-a540-7fcbc629a418 read-only * Will now halt # Any idea about how to investigate/solve this problem?? Thanks in advance, David Fernandez -- lxc.xml file -- <domain type='lxc'> <name>lxc</name> <memory>524288</memory> <os> <type>exe</type> <init>/sbin/init</init> </os> <vcpu>1</vcpu> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/lib/libvirt/libvirt_lxc</emulator> <filesystem type='mount'> <source dir='/var/lib/lxc/lxc/rootfs'/> <target dir='/'/> </filesystem> <interface type='network'> <source network='default'/> </interface> <console type='pty'/> </devices> </domain>

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[libvirt-users] Reboot KVM guest failed via virsh!
by GaoYi 03 Jul '12

03 Jul '12

Hi, I have tried to reboot a KVM guest by this command line: virsh reboot vm1 However, the virsh report: reboot is not supported without json monitor. I am using libvirt-0.9.9 and qemu-0.14.0. Can anyone provide some help? Thanks, Yi

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[libvirt-users] using vmchannel between 6.x host/guests
by Michael MacDonald 03 Jul '12

03 Jul '12

Hi all. Having trouble figuring out the magic to set up VMChannel comms between EL6.x host/guests. My end goal is to enable fence_virt in the guest to talk to fence_virtd on the host via VMChannel. I'd prefer to use that instead of multicast because it is supposed to work even if networking in the guest is down/borked. My analysis is that there is a mismatch between what libvirt is feeding qemu-kvm and what qemu-kvm is willing to accept: virt-install option: --channel unix,path=/var/run/cluster/fence/foobar,mode=bind,target_type=guestfwd,target_address=10.0.2.179:1229 turns into this XML: <channel type='unix'> <source mode='bind' path='/var/run/cluster/fence/foobar'/> <target type='guestfwd' address='10.0.2.179' port='1229'/> </channel> Which then gets fed to qemu-kvm as this: -chardev socket,id=charchannel0,path=/var/run/cluster/fence/foobar,server,nowait -netdev user,guestfwd=tcp:10.0.2.179:1229,chardev=charchannel0, id=user-channel0 And then qemu-kvm barfs like so: qemu-kvm: -netdev user,guestfwd=tcp:10.0.2.179:1229,chardev=charchannel0,id=user-channel0: Invalid parameter 'chardev' Versions: libvirt-0.9.10-21.el6.1 qemu-kvm-0.12.1.2-2.295.el6 NB: I did try this with the versions in 6.2, got the same result. Upgraded to these versions to see if the problem went away, but no joy. NB2: The fence_virt.conf manpage lists the following as example XML for defining a channel device: <channel type=’unix’> <source mode=’bind’ path=’/sandbox/guests/fence_molly_vmchannel’/> <target type=’guestfwd’ address=’10.0.2.179’ port=’1229’/> </serial> Any advice would be greatly appreciated. I can fall back to multicast, of course, but I'd like to make this work if possible. Thanks! Mike

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[libvirt-users] idle connections (?)
by Evaggelos Balaskas 02 Jul '12

02 Jul '12

Hello, i have noticed that for some reason my windows 2003 & windows 2008 VMs drops map drives caused by idle connections. I am not a windows admin and i have no knowledge of troubleshooting this, except reading support.microsoft.com The win admin is yelling that this is a fedora17 libvirt problem and that i need to fix this. I have two different net cards and i am using macvtap with vepa model for the VMs Is there any possibility that could be true ? Can i test somehow or prove that this is not related with libvirt ? Thanks in advance for any help. -- Evaggelos Balaskas - Unix System Engineer http://gr.linkedin.com/in/evaggelosbalaskas

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[libvirt-users] virsh iface-list () - function is not supported
by Ananth 02 Jul '12

02 Jul '12

Hi, I am using KVM hypervisor on Ubuntu 12.04 (libvirt-0.9.8). The call to list the interfaces seem to be failing on this version of libvirt as seen below. virsh # iface-list error: Failed to list active interfaces error: this function is not supported by the connection driver: virConnectNumOfInterfaces I have seen this issue with libvirt 0.9.2 as well, which seemed to be working in 0.9.4 version. Is there any work around for this or any alternate way of querying the interfaces and bridges through libvirt? -- Regards Ananth

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[libvirt-users] qemu-kvm fails on RHEL6
by sumit sengupta 02 Jul '12

02 Jul '12

Hi, When I'm trying to run qemu-kvm command on RHEL6(linux kernel 2.6.32) then I get following errors which I think related to tap devices in my setup. Any idea why is that? bash$ LC_ALL=C PATH=/sbin:/usr/sbin:/bin:/usr/bin QEMU_AUDIO_DRV=none /usr/libexec/qemu-kvm -S -M rhel6.2.0 -enable-kvm -m 512 -smp 1,sockets=1,cores=1,threads=1 -name instance-00000027 -uuid a93aeed9-15f7-4ded-b6b3-34c8d2c101a8 -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/instance-00000027.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -kernel /home/sumitsen/openstack/nova/instances/instance-00000027/kernel -initrd /home/sumitsen/openstack/nova/instances/instance-00000027/ramdisk -append root=/dev/vda console=ttyS0 -drive file=/home/sumitsen/openstack/nova/instances/instance-00000027/disk,if=none,id=drive-virtio-disk0,format=qcow2,cache=none -device virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0 -netdev tap,fd=26,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=fa:16:3e:15:84:3e,bus=pci.0,addr=0x3 -chardev file,id=charserial0,path=/home/sumitsen/openstack/nova/instances/instance-00000027/console.log -device isa-serial,chardev=charserial0,id=serial0 -chardev pty,id=charserial1 -device isa-serial,chardev=charserial1,id=serial1 -usb -device usb-tablet,id=input0 -vnc 127.0.0.1:0 -k en-us -vga cirrus -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 char device redirected to /dev/pts/1 qemu-kvm: -netdev tap,fd=26,id=hostnet0: TUNGETIFF ioctl() failed: Bad file descriptor TUNSETOFFLOAD ioctl() failed: Bad file descriptor qemu-kvm: -append root=/dev/vda: could not open disk image console=ttyS0: No such file or directory [sumitsen@sorrygate-dr ~]$ rpm -qa qemu-kvm qemu-kvm-0.12.1.2-2.209.el6.x86_64 Let me know if you need any other info. Thanks, Sumit

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[libvirt-users] How does libvirt interaction with KVM to create a VM?
by Dennis Chen 02 Jul '12

02 Jul '12

All, These days I am trying to understand the interaction relationship between the libvirt and KVM kernel module, eg. kvm_intel.ko. We know that KVM kernel module expose an entry in form of device file "/dev/kvm" which can be accessed by user space application to control, for example, create a VM using KVM_CREATE_VM with help of ioctl. Now let's say the tool virsh based upon libvirt, we can create a guest domain with the command looks like: #virsh create guest.xml Obviously, the above command will create a VM. But when I try to investigate the libvirt code, I can't find any code play with the "/dev/kvm" to send KVM_CREATE_VM ioctl code to KVM kernel module. But I do found that the reference count of the kvm_intel.ko changed before the virsh create command launched and after. So my question is: how does the libvirt interaction with KVM to create a VM? Anybody can give me some tips about that, eg, the corresponding codes in libvirt? BRs. Dennis

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