February 2015 - Users - libvirt List Archives

[libvirt-users] virRandomBits - not very random
by Brian Rak 01 Jun '18

01 Jun '18

I just ran into an issue where I had about 30 guests get duplicate mac addresses assigned. These were scattered across 30 different machines. Some debugging revealed that: 1) All the host machines were restarted within a couple seconds of each other 2) All the host machines had fairly similar libvirtd pids (within ~100 PIDs of each other) 3) Libvirt seeds the RNG using 'time(NULL) ^ getpid()' This perfectly explains why I saw so many duplicate mac addresses. Why is the RNG seed such a predictable value? Surely there has to be a better source of a random seed then the timestamp and the pid? The PID seems to me to be a very bad source of any randomness. I just ran a test across 60 of our hosts. 43 of them shared their PID with at least one other machine.

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[libvirt-users] Freeze Windows Guests For Consistent Storage Snapshots
by Payes Anand 09 Jun '15

09 Jun '15

Hi, Is it possible to freeze windows guests for a consistent storage level snapshot. I am using openstack icehouse on centos 6.6 Hypervisor: KVM Libvirt: 0.10.2 Qemu: 0.10.2 Guest OS: Windows 7 and Windows Server 2008 I was able to freeze Centos guests by issuing the command: virsh qemu-agent-command <guest_ID> '{"execute":"guest-fsfreeze-freeze"}' For CentOS guests, I enabled access between compute nodes and guests through a socket by setting metadata parameter, hw_qemu_guest_agent=yes for the guest image. And then installing qemu-guest-agent inside the guest. What steps do i have to follow for windows ? Regars, Payes

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[libvirt-users] machine='pc-q35-2.1' and sata controller
by Thomas Stein 25 Mar '15

25 Mar '15

Hello. I'm not able to disable the sata controller on a machine='pc-q35-2.1' type VM. Whenever i delete: <controller type='sata' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x1f' function='0x2'/> </controller> it gets added again when i close the editor. The reason i would like to delete the sata controller is this error while trying to migrate the machine: 2015-02-23 19:04:11.181+0000: 1972: error : qemuMonitorJSONCheckError:381 : internal error: unable to execute QEMU command 'migrate': State blocked by non-migratable device '0000:00:1f.2/ich9_ahci' Someone has an idea to solve this? thanks and cheers t.

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[libvirt-users] Hyper-V 2008 R2 support ?
by Jean-François FILIPPI 08 Mar '15

08 Mar '15

Hi, I'm trying libvirt to connect to Hyper-V servers. It works fine for Hyper-V 2012 servers, however it doesn't work for Hyper-V 2008 R2 (the exact error is | Call to virConnectOpenAuth failed: internal error: Transport error during enumeration: Could not connect (7) (Libvirt::ConnectionError)|.). I'm using the code provided by libvirt documentation (http://libvirt.org/ruby/examples/open_auth.rb) and have authorized basic auth plus unencrypted connection on both 2008 R2 & 2012 servers (http://libvirt.org/drvhyperv.html#auth) Surfing the Internet to find some solutions, I found this (https://www.redhat.com/archives/libvir-list/2014-April/msg00802.html) where a developer talks about stopping 2008 R2 support (because of some technical stuff), while in the documentation (http://libvirt.org/drvhyperv.html) it is explicitely said to be supporting 2008 R2. My question is : does the support has been stopped or does the code to connect to a 2008 R2 server is different from the 2012 server ? I'm using libvirt 1.2.2 and ruby-libvirt 1.2.2. Thanks for your help, Jean-François FILPPI

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[libvirt-users] Broken OS when booting rootfs from 9p share
by Olivier Mauras 02 Mar '15

02 Mar '15

Hello, I've been trying to boot a VM with the rootfs being a 9P share from the host. The VM OS is centos 7. The OS boots but no services can work and it appears that the authentication system is broken. Now the funny thing is that booting the same OS on the same 9P share manually with Qemu works as expected with a fully functionnal OS... So I'm wondering what could libvirt do that render the OS on the share broken - Something with rights ? Selinux is disabled on the host, and accessmode to the share is set to passthrough in both cases. Here's my working Qemu line: qemu -kernel /srv/overlay/kernels/grsec-3.14.33-101/vmlinuz-3.14.33-101.el6.x86_64 -initrd /srv/overlay/kernels/grsec-3.14.33-101/initramfs-3.14.33-101.el6.x86_64.img -fsdev local,id=r,path=/srv/overlay/run/irc,security_model=passthrough -device virtio-9p-pci,fsdev=r,mount_tag=root -nographic -m 256M -machine pc-i440fx-2.1,accel=kvm -netdev tap,id=net0 -device virtio-net,netdev=net0,mac=52:54:00:12:36:34 -smp 1,sockets=1,cores=1 -append 'root=virtfs:root rootflags=trans=virtio,version=9p2000.u ro rootfstype=9p console=ttyS0' And here my libvirt VM config: <domain type='kvm'> <name>irc</name> <uuid>ffbd32eb-a693-eadd-8923-18de80137472</uuid> <memory unit='KiB'>262144</memory> <currentMemory unit='KiB'>262144</currentMemory> <vcpu placement='static'>1</vcpu> <os> <type arch='x86_64' machine='pc-i440fx-2.1'>hvm</type> <kernel>/srv/overlay/kernels/grsec-3.14.33-101/vmlinuz-3.14.33-101.el6.x86_64</kernel> <initrd>/srv/overlay/kernels/grsec-3.14.33-101/initramfs-3.14.33-101.el6.x86_64.img</initrd> <cmdline>root=virtfs:root rootflags=trans=virtio,version=9p2000.u ro rootfstype=9p</cmdline> <boot dev='hd'/> </os> <features> <acpi/> <apic/> <pae/> </features> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <devices> <emulator>/usr/bin/qemu-system-x86_64</emulator> <controller type='usb' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/> </controller> <controller type='pci' index='0' model='pci-root'/> <filesystem type='mount' accessmode='passthrough'> <source dir='/srv/overlay/run/irc'/> <target dir='root'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </filesystem> <interface type='bridge'> <mac address='52:54:00:00:36:34'/> <source bridge='br0'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> <serial type='pty'> <target port='0'/> </serial> <console type='pty'> <target type='serial' port='0'/> </console> <input type='mouse' bus='ps2'/> <input type='keyboard' bus='ps2'/> <graphics type='vnc' port='-1' autoport='yes'/> <video> <model type='cirrus' vram='9216' heads='1'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> <memballoon model='virtio'> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </memballoon> </devices> </domain> My libvirt version is 1.2.9, and qemu is 2.1.2. Thanks for your help, Olivier

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[libvirt-users] DriveReady error after live migration
by Steve Gaarder 27 Feb '15

27 Feb '15

I have three machines running libvirt under Scientific Linux (RHEL derivative) version 6. The virtual machine disk images are running SL 5 and 6, are all stored on NFS, and I can do live migrations with virsh migrate --live guestname qemu+ssh://vmhostname.math.cornell.edu/system Trouble is, within a day or two after the migration, the guest hangs up with repeated DriveReady errors and has to be shut down forcibly and rebooted. I am using Sanlock, with the lock files also stored on NFS. Any ideas? Steve Gaarder System Administrator, Dept of Mathematics Cornell University, Ithaca, NY, USA gaarder(a)math.cornell.edu

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[libvirt-users] KVM management through the web with libvirt and mist.io
by Markos Gogoulos 26 Feb '15

26 Feb '15

Hi, I would like to announce that we have integrated libvirt for managing KVM vms on mist.io. Mist.io is an open source project and a service that can assist you in managing your vms on a unified way, providing a simple interface for all of your infrastructure (multiple public cloud providers, OpenStack based public/private clouds, Docker servers, bare metal servers and now KVM hypervisors). Adding a KVM backend via libvirt will show a list of all of the virtual machines (running and terminated), along with the hypervisor itself. You can execute actions such as reboot, shutdown and start. Instead of having to log in to the hypervisor to reboot a VM that has hanged, you can do it with a few taps on your smartphone, laptop or tablet, along with the rest of your infrastructure. You can also have a web ssh shell if you add an ssh key. Creation of new VMs is not supported yet but is on our plans. You can have a look on a blog post we've written recently at http://blog.mist.io/post/110890044256/announcing-kvm-and-vcloud-support, use the open source tool (http://github.com/mistio/mist.io) or try out the service (https://mist.io) offering more features such as monitoring, adding custom metrics, scripts and logs. Hope you'll find it usefull Cheers, Markos

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[libvirt-users] Adding timestamps for all emulator output
by Andrey Korolyov 26 Feb '15

26 Feb '15

Hello, I think it would be useful if libvirt will be able to prefix all messages from emulator pipes with the date stamping, for example I am trying to catch very rare and non-fatal race with virtio-serial-bus: Guest failure in adding device virtio-serial0.0 which is specific to the Windows guests on qemu-kvm. I have supporting infrastructure which can tell me exact times for every action upon this VM, but as bug is not frequent, the continuous monitoring looks like an overkill for a desired goal - find a correlation between emulator event and message from stderr. Patching emulator itself is barely an option, as it is ugly, requires refresh of the running code via loopback migration and completely non-universal, as every hypervisor should be modified seperately. I`d highly appreciate positive consideration for such functionality addition or can write a patch shortly, if needed. Thanks!

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[libvirt-users] Questión about DNS config on dnsmasq
by Carlos Miranda Molina (Mstaaravin) 26 Feb '15

26 Feb '15

Hello guys... I'm using libvirt in my local laboratory and I have a question/problem about DNS settings over dnsmasq (by libvirt) I have a NAT network separately from my real network, i need simulated some DNS hosts to NAT network like ftp.debian.org (for testing purposes, etc) This is for example a dumpxml (yes, i'm using PXE boot for testing and is working fine) <network> <name>net0</name> <uuid>5a014735-f658-7a87-c7d4-e6b0f488c332</uuid> <forward mode='nat'/> <bridge name='net0' stp='on' delay='0'/> <mac address='52:54:00:b5:24:7b'/> <dns> <host ip='192.168.122.1'> <hostname>mirrors.kernel.org</hostname> <hostname>mirrors.dcarsat.com.ar</hostname> <hostname>ftp.debian.org</hostname> </host> </dns> <ip address='192.168.122.1' netmask='255.255.255.0'> <tftp root='/home/tftp'/> <dhcp> <range start='192.168.122.2' end='192.168.122.99'/> <bootp file='pxelinux.0'/> </dhcp> </ip> </network> Look <dns> & <hostname> section, that works correctly but only if I add hostnames on net0 when was offline. <dns> <host ip='192.168.122.1'> <hostname>mirrors.kernel.org</hostname> <hostname>mirrors.dcarsat.com.ar</hostname> <hostname>ftp.debian.org</hostname> </host> </dns> How i can add more hostnames with my network (net0) are still online...? virsh net-update default add-last dns-host (for example, doesn't work) and the official documentation @ http://libvirt.org/formatnetwork.html#elementsAddress doesn't say more. I test with <forwarder > but doesn't work (192.168.10.100 is a dnsmasq outside libvirt control) <network> <name>net0</name> <uuid>5a014735-f658-7a87-c7d4-e6b0f488c332</uuid> <forward mode='nat'/> <bridge name='net0' stp='on' delay='0'/> <mac address='52:54:00:b5:24:7b'/> <dns> <forwarder addr="192.168.10.100"/> </dns> <ip address='192.168.122.1' netmask='255.255.255.0'> <tftp root='/home/tftp'/> <dhcp> <range start='192.168.122.2' end='192.168.122.99'/> <bootp file='pxelinux.0'/> </dhcp> </ip> </network> Anyone can help me...? thanks -- "La Voluntad es el único motor de nuestros logros" http://blog.ngen.com.ar/

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[libvirt-users] A problem with converting an OVA appliance
by Marko Dimjašević 25 Feb '15

25 Feb '15

Hi all, I've been having a problem when trying to convert an Open Virtualization Appliance (OVA) format appliance to the "virt-image" format. This is how I try to convert the appliance: $ virt-convert --arch=i686 -i ovf appliance.ova The result is: ERROR Couldn't import file "appliance.ova": must be string without null bytes or None, not str This happens on a Debian Wheezy (7.8) machine. virt-convert is at version 0.600.1. All libvirt* packages are at version 1.2.9. Unfortunately, I couldn't find anyone else through web searches having the same issue and then applying their solution. It'd be great if someone can help with trying to figure out what is going on here... -- Regards, Marko http://dimjasevic.net/marko

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