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[libvirt-users] running LXC hello world example
by Jacob Everist 23 Jan '14

23 Jan '14

Hello, I am having difficulty getting any sort of LXC container running. I am trying to use the following tutorial to run the hello world example: https://www.berrange.com/posts/2011/09/27/getting-started-with-lxc-using-li… Here are the results of my running the tutorial: [root@terraria ~]# virsh list Id Name State ---------------------------------------------------- [root@terraria ~]# virsh uri lxc:/// [root@terraria ~]# cat helloworld.xml <domain type='lxc'> <name>helloworld</name> <memory>102400</memory> <os> <type>exe</type> <init>/bin/sh</init> </os> <devices> <console type='pty'/> </devices> </domain> [root@terraria ~]# virsh define helloworld.xml Domain helloworld defined from helloworld.xml [root@terraria ~]# virsh start helloworld error: Failed to start domain helloworld error: internal error guest failed to start: PATH=/bin:/sbin TERM=linux container=lxc-libvirt container_uuid=791640de-95a9-082c-7292-c55106bcdca9 LIBVIRT_LXC_UUID=791640de-95a9-082c-7292-c55106bcdca9 LIBVIRT_LXC_NAME=helloworld /bin/sh error receiving signal from container: Input/output error --- As you can see, I am getting an error. How do I go about diagnosing this error? This is a fresh install so the only thing I have been using this machine for is for LXC/libvirt testing. -- Jacob Everist cell: 310-425-9732 email: jacob.everist(a)gmail.com

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[libvirt-users] LXC configuration for Systemd in the user namespace.
by Jan Olszak 23 Jan '14

23 Jan '14

Hi there! Does anyone have a config file for libvirt-LXC, that makes it possible to: 1. Use all namespaces (user namespace in particular) 2. Run systemd inside a container. Thanks! Jan

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[libvirt-users] If it's possible for a third-party PCIe card to be shared by multiple containers
by WANG Cheng D 23 Jan '14

23 Jan '14

Dear all, I have a thirty-party PCIe card in my host which can work properly in native mode. I wonder if this card can be shared by multiple containers. As far as the network interface is concerned, too many efforts have been made for it. Two dedicated cgroup resource schedulers/subsystem(net_cls, net_prio) have been provided at the kernel level, and libvirt has also done a lot of work on virtual networking to enable network interface sharing between containers. As it's difficult for me to implement all these things that have been done for network interface, I should find other way to enable sharing of this card. Do you have any idea? Any comments will be high appreciated. Cheng Wang

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[libvirt-users] How to change virtfs/9p/v9fs umask
by Javi Legido 22 Jan '14

22 Jan '14

Hi there. My question is regarding virtfs/9p/v9fs [1], not sure what's the appropiate name :) Basically I have a KVM + libvirt server sharing a directory with a guest in mapped mode. It works fine, but the only issue is with the file permissions of the files created by the guest inside the host: -They are 0700 for dirs and 0400 for files -The files belongs to the same user that runs the "qemu-system-x86_64" process, which is "libvirt-qemu" Questions: 1. There's a way to change the umask of this user (I'm almost sure that I already tried this and it didn't worked) or to change any setting to force the permissions to be wider? 2. It's acceptable to run the "qemu-system-x86_64" as root, and switch to "passthrough" mode? Below some details of my environment. ==== Host ==== $ uname -r 3.12-1-amd64 $ cat /etc/issue Debian GNU/Linux jessie/sid \n \l $ sudo dpkg -l | grep libvirt ii libvirt-bin 1.2.0-2 amd64 programs for the libvirt library ii libvirt0 1.2.0-2 amd64 library for interfacing with different virtualization systems ii python-libvirt 1.2.0-2 amd64 libvirt Python bindings $ ps ax | grep vm_name 23307 ? Sl 0:40 qemu-system-x86_64 -enable-kvm -name vm_name -S -machine pc-1.1,accel=kvm,usb=off -cpu core2duo,+lahf_lm,+pdcm,+xtpr,+cx16,+tm2,+est,+smx,+vmx,+ds_cpl,+dtes64,+pbe,+tm,+ht,+ss,+acpi,+ds -m 1024 -realtime mlock=off -smp 2,sockets=2,cores=1,threads=1 -uuid 2387f160-ffa2-3463-1aa3-771594779df3 -nographic -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/vm_name.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/dev/vg/lv_vm_name,if=none,id=drive-virtio-disk0,format=raw,cache=none -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -fsdev local,security_model=mapped,id=fsdev-fs0,path=/srv/share -device virtio-9p-pci,id=fs0,fsdev=fsdev-fs0,mount_tag=virtfs_share,bus=pci.0,addr=0x3 -netdev tap,fd=28,id=hostnet0,vhost=on,vhostfd=29 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:68:90:d8,bus=pci.0,addr=0x4 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -device usb-tablet,id=input0 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x7 Guest XML snippet: <filesystem type='mount' accessmode='mapped'> <source dir='/srv/share/> <target dir='virtfs_share'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </filesystem> Thanks. Javier [1] http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/plain/Docume…

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[libvirt-users] PCI Passthrough
by The PowerTool 21 Jan '14

21 Jan '14

I'm trying to pass-through my VGA card to a guest session. I found: http://www.linux-kvm.org/page/How_to_assign_devices_with_VT-d_in_KVM - which is very frustrating because there's no date on the documentation. I suspect it's old. It does clearly say that you must have VT-d support for pci pass-through. It then goes on to say "Some work towards allowing this ["software pass-through"] were done, but the code never made it into KVM". If this is old is there now support for PCI pass-through on hardware that doesn't support VT-d? I have a HP p7-1456c which has: Intel Core i5-3330 Processor (VT-x=yes, VT-d=yes) http://ark.intel.com/products/65509/Intel-Core-i5-3330-Processor-6M-Cache-u… on a MB: H-Joshua-H61-UATX (with specs that say *nothing* about virtualization) http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&docname=c03135925#N… and the H-Joshua-H61-UATX uses the Intel H61 Express Chipset (VT-d=No) http://ark.intel.com/products/52806/Intel-BD82H61-PCH?q=intel%20h61%20expre… On the KVM how to assign devices page it provides a way to verify IOMMU support on Intel: ]# dmesg | grep -e DMAR -e IOMMU [ 0.000000] ACPI: DMAR 00000000d8d29460 000B0 (v01 HPQOEM SLIC-CPC 00000001 INTL 00000001) [ 0.023074] dmar: IOMMU 0: reg_base_addr fed90000 ver 1:0 cap c0000020e60262 ecap f0101a [ 0.023078] dmar: IOMMU 1: reg_base_addr fed91000 ver 1:0 cap c9008020660262 ecap f0105a [ 0.023151] IOAPIC id 2 under DRHD base 0xfed91000 IOMMU 1 Does this mean I do have VT-d/IOMMU support??? I attempted to follow the basic instructions to pass through my VGA card: ]$ lspci -nn | grep VGA 00:02.0 VGA compatible controller [0300]: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller [8086:0152] (rev 09) Then added to my domain definition: <hostdev mode='subsystem' type='pci' managed='yes'> <source> <address domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </source> <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/> </hostdev> With that added code I consistently get "Connection to guest failed" messages and the guest fails to start. /var/log/libvirt/qemu is empty. No log. So my 1st question is can I do this given my hardware? If the answer is "yes" then this is where I'm stuck. Additionally, I tried: ]$ virsh nodedev-detach pci_0000_00_02_0 error: Failed to detach device pci_0000_00_02_0 error: Failed to add PCI device ID '8086 0152' to pci-stub: Permission denied My thinking was simply to verify if I could manually detach the device. I couldn't find a reference searching for this error. Any help would be greatly appreciated! Thank you!

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[libvirt-users] Will virsh command setvcpus/vcpupin be supported by lxc driver in the future?
by WANG Cheng D 21 Jan '14

21 Jan '14

Dear member of libvirt team, I hope the lxc could be dynamically reconfigured, such as the number of vcpu or vcpu pinning. According to http://libvirt.org/hvsupport.html , at present, setvcpus(virDomainSetVcpus) and vcpupin (virDomainGetVcpuPinInfo) are not supported by lxc driver. I wonder if these commands will be supported by libvirt in the future? Best wishes, Cheng Wang

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[libvirt-users] Yet another disk I/O performance issue
by Matteo Lanati 20 Jan '14

20 Jan '14

Hi all, I'm running a VM using libvirt+KVM and I have a disk performance issue. The host is the following: 4 cores Intel Xeon 5140(a)2.33 GHz, 16 GB of RAM, SATA HDD, OS Debian Wheezy, libvirt 0.9.12-11, QEMU-KVM 1.1.2+dfsg-2. The guest: 1 CPU, 2 GB RAM running Debian 7.0, image in compressed qcow2 format. When I try do run "dd if=/dev/zero of=io.test bs=32768k count=40" I get around 500 MB/s on bare metal, while only around 30 MB/s inside the VM. I'm trying to get something more out of the virtualization layer, I hope that there's room for improvement. I'm using virtio, I aready set cache='none' and io='native' in the domain definition. Both host and guest are using deadline as I/O scheduler. The VM uses an ext4 filesystem, while the image is saved on an ext3 disk. I mounted the host and guest filesystems specifying nodiratime and noatime options. Even if I convert the image to raw format nothing changes. I didn't mess with iotune nor blockio. Is there something that I overlooked or any other suggestion? Thanks in advance for your help. Matteo -- A refund for defective software might be nice, except it would bankrupt the entire software industry in the first year. Andrew S. Tanenbaum, Computer Networks, 2003, Introduction, page 14 Linux registered user #463400

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[libvirt-users] Retry reboots in xmls files for libvirt
by Fernando Porro 20 Jan '14

20 Jan '14

Hi, I have a virtual machine defined by xml that start from pxe (network boot), my problem is that sometimes the dhcp server is not ready when the virtual machine try to boot. I need that the virtual machine keep asking for dhcp (network reboot) many times, until dhcp is ready and can start the virtual machine with a valid ip. How can I configure that in the xml file? BR //Fernando

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[libvirt-users] Should domain be undefined after migration, or not?
by Brian Candler 20 Jan '14

20 Jan '14

I have been running a lab using libvirt under Debian Wheezy (libvirt 0.9.12.3-1, qemu-kvm 1.1.2+dfsg-6, virt-manager 0.9.1-4). There are a number of machines as front-end servers and an nbd shared storage backend. When I live-migrate a domain from one machine to another, normally I observe that afterwards the domain remains on the source host (but in "shutdown" state), as well as on the target host (in "running" state). But occasionally I have observed the domain being removed from the source host. The trouble with the domain remaining on the source host is that it is all too easy to double-click on the shutdown domain in virt-manager and start it there accidentally, in addition to the copy on the target host - resulting in disaster. (I know this can be prevented using the sanlock plugin) Furthermore, there could be stale copies of the XML lying around on some machines where the domain had been running at some point in the past. My question is, what is the expected behaviour? Is not removing the domain definition from the source host a bug? Has this been changed in a newer version of libvirt? Thanks, Brian.

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[libvirt-users] jumbo frame
by Anton Gorlov 20 Jan '14

20 Jan '14

I would like to use jumbo frame for local interfaces, but I am not sure in which order to set it up. Should it be set on the physical interface first, then on the bridge and on the guest, or in another way? On some servers there are configurations with vlan on the bridge

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