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[libvirt-users] F20 Virt-Manager with MacVTap not working
by John Obaterspok 13 Feb '14

13 Feb '14

Hello, I've setup a VM with default networking (NAT) and this works fine but hosts on my LAN can't get to the VM since it uses NAT. When I try to set network to use MacVTap with either default or bridged I get no networking for the VM. Any hints around this? I would like to have the VM's on the same LAN as my host and other machines. I don't care if the VM host can't reach the guests. It did work find in F19 but there I believe I had more MacVtap devices to choose from. -- john

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[libvirt-users] Help? Running into problems with migrateToURI2() and virDomainDefCheckABIStability()
by Chris Friesen 13 Feb '14

13 Feb '14

Hi, We've run into a problem with libvirt 1.1.2 and are looking for some comments on whether this is a bug or design intent. We're trying to use migrateToURI() but we're using a few things (numatune, vcpu mask, etc.) that may need adjustment during the migration. We found that migrateToURI2() mostly works if we use XML created by copying the domain XML from the running instance and modifying the appropriate sections. The problem that we're seeing is that the serial console checking in libvirt/src/conf/domain_conf.c::virDomainDefCheckABIStability() is failing even though we haven't touched the serial console XML: 2014-02-10 19:41:07.196 1264 ERROR nova.virt.libvirt.driver [-] [instance: 42a841a8-034f-4565-937e-adb396a2ec48] Live Migration failure: unsupported configuration: Target domain console count 1 does not match source 0 On occasion it passes if the devices/serial/source element happens to be the same after migration, but this seems to be a fluke. If we remove the devices/serial/source element in the XML it seems to make the serial console check work on the first migration, but upon doing subsequent migration it fails with a console count error: 2014-02-07 16:11:32.459 28759 ERROR nova.virt.libvirt.driver [-] [instance: 1d7c470d-4337-450a-8a40-d0fb375ca2c1] Live Migration failure: unsupported configuration: Target domain console count 0 does not match source 1 Are we doing something wrong? Is there an issue with the console check code? Is there a better way to do what we're trying to do? Any help would be appreciated... Thanks, Chris

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[libvirt-users] Can you verify currently defined libvirt secret provides valid Cephx auth?
by Scott Sullivan 12 Feb '14

12 Feb '14

As the subject suggests, I am wondering if its possible to verify if the currently defined libvirt secret provides valid authentication via Cephx to a Ceph cluster? I ask because ideally I would like to verify that the given cephx credentials in my libvirt secret are valid before I even attempt the virsh attach-device on the domain. I tried searching for a solution to this, but I can't seem to find a way to _just_ check if the currently defined libvirt secret provides valid authentication to the Ceph cluster or not. Is this possible?

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[libvirt-users] LXC container driver
by arnaud gaboury 12 Feb '14

12 Feb '14

Dear all, I am slowly building a Arch Linux VM guest on my Arch Linux host. The guest machine is now built and is recognized as shown by this command : gabx@hortensia ➤➤ ~ % machinectl list MACHINE CONTAINER SERVICE dahlia container nspawn 1 machines listed. I an following the libvirt.org documentation. Now, according this page[1] about lxc driver, i am dealing with namespace requirements. This sentence, in bold, puzzles me: A suitably configured UID/GID mapping is a pre-requisite to making containers secure, in the absence of sVirt confinement. If I understand what a namespace is, I have no idea how to make sure my UIG/GID mapping is well configured. I would appreciate having any hints abut this part of the settings. Another question : is there any advantage/disadvantage using the lxc Userspace tools[2] instead of libvirt to manage these namespaces ? Thank you for help. [1]http://libvirt.org/drvlxc.html [2]http://linuxcontainers.org/

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[libvirt-users] Connection from host to lxc container dbus
by Piotr Bartosiewicz 12 Feb '14

12 Feb '14

Hi, I am unsuccessfully trying to connect from host to containers dbus. Inside container dbus socket file is visible as /run/dbus/system_bus_socket. The problem is that /run is mounted as tmpfs in container (by systemd on container) and thus the directory content is not visible outside the container. Is there any way to make this file visible also outside the container? Regards, Piotrek

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[libvirt-users] SR-IOV: no traffic isolation between VFs with Broadcom 10Gbps cards
by Yoann Juet 11 Feb '14

11 Feb '14

Hi all, I'm testing on debian/unstable SR-IOV feature with Broadcom BCM57810 cards and KVM hypervisor: Compiled against library: libvirt 1.2.1 Using library: libvirt 1.2.1 Using API: QEMU 1.2.1 Running hypervisor: QEMU 1.7.0 bnx2x -> firmware 7.8.17 -> driver from kernel 3.12.7 8 VFs are created on the first PF. For each VF, a specific mac address is set manually using "ip link set eth0 vf x mac xx:xx:xx:xx:xx" command. I run several KVM guests with PCI passthrough (same kernel, bnx2x driver and firmware as the host), performance is close to bare metal. Well, that sounds good, until I start capturing the traffic inside each VM: host traffic is visible as well as traffic destined to other VM. It's like if internal card switching was inoperable. I made several tests with different kernels, different PCIe Passthrough method assignments for libvirt. All failed. Has anyone successfully experiment SR-IOV with Broadcom cards on linux ? ----- Some details: 01:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM57810 10 Gigabit Ethernet (rev 10) 01:00.1 Ethernet controller: Broadcom Corporation NetXtreme II BCM57810 10 Gigabit Ethernet (rev 10) 01:09.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM57810 10 Gigabit Ethernet Virtual Function 01:09.1 Ethernet controller: Broadcom Corporation NetXtreme II BCM57810 10 Gigabit Ethernet Virtual Function 01:09.2 Ethernet controller: Broadcom Corporation NetXtreme II BCM57810 10 Gigabit Ethernet Virtual Function 01:09.3 Ethernet controller: Broadcom Corporation NetXtreme II BCM57810 10 Gigabit Ethernet Virtual Function 01:09.4 Ethernet controller: Broadcom Corporation NetXtreme II BCM57810 10 Gigabit Ethernet Virtual Function 01:09.5 Ethernet controller: Broadcom Corporation NetXtreme II BCM57810 10 Gigabit Ethernet Virtual Function 01:09.6 Ethernet controller: Broadcom Corporation NetXtreme II BCM57810 10 Gigabit Ethernet Virtual Function 01:09.7 Ethernet controller: Broadcom Corporation NetXtreme II BCM57810 10 Gigabit Ethernet Virtual Function # virsh nodedev-dumpxml pci_0000_01_09_0 <device> <name>pci_0000_01_09_0</name> <path>/sys/devices/pci0000:00/0000:00:01.0/0000:01:09.0</path> <parent>pci_0000_00_01_0</parent> <driver> <name>vfio-pci</name> </driver> <capability type='pci'> <domain>0</domain> <bus>1</bus> <slot>9</slot> <function>0</function> <product id='0x16af'>NetXtreme II BCM57810 10 Gigabit Ethernet Virtual Function</product> <vendor id='0x14e4'>Broadcom Corporation</vendor> <capability type='phys_function'> <address domain='0x0000' bus='0x01' slot='0x00' function='0x1'/> </capability> <iommuGroup number='35'> <address domain='0x0000' bus='0x01' slot='0x09' function='0x0'/> </iommuGroup> </capability> </device> # virsh nodedev-dumpxml pci_0000_01_09_1 <device> <name>pci_0000_01_09_1</name> <path>/sys/devices/pci0000:00/0000:00:01.0/0000:01:09.1</path> <parent>pci_0000_00_01_0</parent> <driver> <name>vfio-pci</name> </driver> <capability type='pci'> <domain>0</domain> <bus>1</bus> <slot>9</slot> <function>1</function> <product id='0x16af'>NetXtreme II BCM57810 10 Gigabit Ethernet Virtual Function</product> <vendor id='0x14e4'>Broadcom Corporation</vendor> <capability type='phys_function'> <address domain='0x0000' bus='0x01' slot='0x00' function='0x1'/> </capability> <iommuGroup number='36'> <address domain='0x0000' bus='0x01' slot='0x09' function='0x1'/> </iommuGroup> </capability> </device> Guest A XML: ... <hostdev mode='subsystem' type='pci' managed='yes'> <source> <address domain='0x0000' bus='0x01' slot='0x09' function='0x0'/> </source> </hostdev> ... Guest B XML: ... <hostdev mode='subsystem' type='pci' managed='yes'> <source> <address domain='0x0000' bus='0x01' slot='0x09' function='0x1'/> </source> </hostdev> ... -- Université de Nantes - Direction des Systèmes d'Information

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[libvirt-users] libvirt 1.2.1 / lxc : default virtual network not defined after installing/starting Libvirt
by Mohamed Amine Larabi 11 Feb '14

11 Feb '14

Hi There, I am using Libvirt 1.2.1 on Fedora 20. So, Libvirt is well installed and started but the weird thing is that the 'default' virtual network is not automatically defined and started, knowing that I can define/start it manually and everything goes fine. previously I was using libvirt 1.0.4 and the 'default' virtual network was defined/started at Libvirt startup. so, I am wondering if this new behavior was introduced intentionally in the latest versions of Libvirt or it's a known issue. Thank you in advance for your help. Regards Mohamed.

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[libvirt-users] event-test.py cannot detects domain shutdown
by Kim Larry 10 Feb '14

10 Feb '14

Hi, I used event-test.py from here: http://libvirt.org/git/?p=libvirt-python.git;a=blob;f=examples/event-test.p… which is very lasted version. However, it detects all of events but not domain shutdown. I've searched through Google and got nothing. libvirtd version is 1.1.4 and using Xen for hypervisor. Any ideas? Larry

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[libvirt-users] libvirt/qemu and cgroups
by arnaud gaboury 10 Feb '14

10 Feb '14

Dear list, I am building a Arch server on my Arch box. My tools are QEMU/KVM and libvirt to manage the guest, systemd as system manager. I am looking at implementing the Linux Control Groups facilities for resource management. Even after long hours of reading, I am not quite sure about how to deal with the cgroups facilities. First, do I really need to care about all that, or libvirt and systemd will manage the resource in an efficient way right out of the box? If not, It's all about /etc/cgconfig.conf and cgrules.conf. I am honestly not sure : -what are the correct mount points for cpu, memory etc in the /sys/fs/cgroup directory . - which directories am I supposed to mk, if any ? Then, Archwiki[1] says: # cgcreate -a $USER -g memory,cpu:groupname - what is the groupename I shall create (qemu*, MyMachine) ? - which $USER shall I use (qemu*, my username) ? * qemu:qemu as user:group in /etc/libvirt/qemu.conf Thank you for some help as I admit if I understand the cgroups principle and advantages, I am far from understanding how to create such a group in case of a VM. [1]https://wiki.archlinux.org/index.php/Cgroups

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[libvirt-users] How to use /dev/mapper in virt-manager/libvirt
by Marc Haber 09 Feb '14

09 Feb '14

Hi, my test host is running Debian/GNU Linux unstable and has virt-manger 0.9.5 and libvirt 1.2.1. I am using encryption and thus have devices in /dev/mapper that are not LVs, for example called /dev/mapper/myvirtualdisk. I'd like to configure libvirt in a way that allows me to directly assign such devices to a VM. This does not work when I create a filesystem directory storage pool in virt-manager since virt-manager obviously choked in /dev/mapper/control, which is a character special device that is only readable by root. I currently help myself by linking the devices in question manually to /dev/luksdev and having a filesystem directory storage pool point to that directory. this works, but is ugly. Is there a nicer way to get the contents of /dev/mapper available as volumes in virt-manager? Greetings Marc -- ----------------------------------------------------------------------------- Marc Haber | "I don't trust Computers. They | Mailadresse im Header Mannheim, Germany | lose things." Winona Ryder | Fon: *49 621 31958061 Nordisch by Nature | How to make an American Quilt | Fax: *49 621 31958062

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