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1608 discussions

Meaning of "vlan=" and "name=" in Linux KVM
by Arun Khan 12 Jun '12

12 Jun '12

Greetings KVM gurus, I am trying to understand a "use case" scenario for the "vlan=n" option and "name=name" for the "-net nic" and "-net tap" directives. I have done some search but I have not come up with anything that sheds any light on the above. <quote from kvm man> Network options: -net nic[,vlan=n][,macaddr=mac][,model=type] [,name=name][,addr=addr][,vectors=v] Create a new Network Interface Card and connect it to VLAN n (n = 0 is the default). The NIC is an e1000 by default on the PC target. Optionally, the MAC address can be changed to mac, the device address set to addr (PCI cards only), and a name can be assigned for use in monitor commands. Optionally, for PCI cards, you can specify the number v of MSI-X vectors that the card should have; this option currently only affects virtio cards; set v = 0 to disable MSI-X. If no -net option is specified, a single NIC is created. Qemu can emulate several different models of network card. Valid values for type are "virtio", "i82551", "i82557b", "i82559er", "ne2k_pci", "ne2k_isa", "pcnet", "rtl8139", "e1000", "smc91c111", "lance" and "mcf_fec". Not all devices are supported on all targets. -net tap[,vlan=n][,name=name][,fd=h][,ifname=name] [,script=file][,downscript=dfile] Connect the host TAP network interface name to VLAN n, use the network script file to configure it and the network script dfile to deconfigure it. If name is not provided, the OS automatically provides one. fd=h can be used to specify the handle of an already opened host TAP interface. The default network configure script is /etc/qemu-ifup and the default network deconfigure script is /etc/qemu-ifdown. Use script=no or downscript=no to disable script execution. </quote from kvm man> My objective is to create a small "virtual" network using bridges/tap interfaces on the Host OS and running the Guest OSs (the network segment separated by vlan=somenumber) My hypothesis is that with "vlan=X" and "name=somename" the VMs can be separated into different segments i.e. a set of tap interfaces on vlan=10 and another set of tap interfaces on vlan=20 connected to the same bridge br0. I have two VMs started with "kvm -net tap,vlan=10" and "kvm -net tap,vlan=20" respectively but with IP numbers in the same subnet 172.16.0.0/24; they are able to ping each other with different "vlan" numbers. I would appreciate any clarification on the "vlan=" and "name=" options. Sample script for my KVM VMs <script> #!/bin/bash kvm \ -vga std \ -m 1024 \ -cpu core2duo \ -smp 2,cores=2 \ -drive file=/home/kvmusr/KVM/vdisks/centos62.img,index=0 \ -net nic,vlan=1,model=e1000,macaddr=${nic_mac_addr0} \ -net tap,vlan=1,ifname=tap0,script=no,downscript=no \ </script> Thanks, -- Arun Khan

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100% load on core after physically removing USB storage from host
by Emmanuel Noobadmin 12 Jun '12

12 Jun '12

I encountered a problem after removing a USB flash drive using virtual machine manager, I notice that the core assigned to the VM guest goes up to 100% load. Within the guest itself, there is no significant activity. This also prompted me to look at the other physical machine from which I used the USB flash drive to transfer files. And it was also exhibiting the same problem. Installed versions are qemu-kvm-0.12.1.2-2.209.el6_2.5.x86_64 on CentOS 6.2, 2.6.32-220.17.1.el6.x86_64 (Intel C204 PCH) There are no error messages in the log files and things seem to be working except for the fully loaded core. After some testing, the only steps needed are 1. VMM add physical host usb device -> select storage to guest 2. VMM remove hardware 3. Physically remove the USB storage from the host, thread/core assigned to guest goes 100% Repeating the same steps without restarting the guest causes cpu utilization to drop back to normal for about a second or so before going back up again. Problem goes away if I restart the guest. There don't seem to be anything related on RHEL bugtrack except one related to hotplug/unplugging a USB controller more than 1000 times. Is this is a bug or there is actually something else I am supposed to do before removing a physical device from a guest? Also is there anyway I get the core/thread back to normal without restarting the guest?

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SR-IOV with Broadcom NIC??
by David Knierim 06 Jun '12

06 Jun '12

Hi, We recently purchased some HP Gen8 servers with Broadcom BCM57810 NIC controllers. I am running CentOS 6.2 on these servers configured as KVM hosts. Has anyone gotten the Broadcom chips to run with SR-IOV on CentOS 6.2? Any clues on how to get it working? I see from the Broadcom glossy marketing docs that this chip supports SR-IOV, but I cannot find a procedure for configuring it. The Red Hat docs show how to configure the Intel chips and the Emulex web site includes a procedure to configure SR-IOV with their chips. In both procedures, there are vendor-specific steps. It is also pretty obvious that appropriate drivers and firmware are required, which I do not know if I have. Any input would be most welcome. Thanks, David

1 0

Where should CentOS users get /usr/share/virtio-win/drivers for virt-v2v?
by Philip Durbin 04 Jun '12

04 Jun '12

I need to migrate a number of virtual machines from VMware ESX to CentOS 6 KVM hypervisors. Ultimately, I wrote an RPM spec file that solved my problem at https://github.com/fasrc/virtio-win/blob/master/virtio-win.spec but I'm not sure if there's another RPM in base CentOS or EPEL (something standard) I should be using instead. Originally, I was getting this "No root device found in this operating system image" error when attemting to migrate a Window 2008 VM. . . [root@kvm01b ~]# virt-v2v -ic 'esx://my-vmware-hypervisor.example.com/' \ -os transferimages --network default my-vm virt-v2v: No root device found in this operating system image. . . . but I solved this with a simply `yum install libguestfs-winsupport` since [the docs][v2v-guide] say: > If you attempt to convert a virtual machine using NTFS without the > libguestfs-winsupport package installed, the conversion will fail. Next I got an error about missing drivers for Windows 2008. . . [root@kvm01b ~]# virt-v2v -ic 'esx://my-vmware-hypervisor.example.com/' \ -os transferimages --network default my-vm my-vm_my-vm: 100% [====================================]D virt-v2v: Installation failed because the following files referenced in the configuration file are required, but missing: /usr/share/virtio-win/drivers/amd64/Win2008 . . . and I resolved this by grabbing an iso from Fedora at http://alt.fedoraproject.org/pub/alt/virtio-win/latest/ as recommended by http://www.linux-kvm.org/page/WindowsGuestDrivers/Download_Drivers and building an RPM from it with this spec file: https://github.com/fasrc/virtio-win/blob/master/virtio-win.spec Now, virt-v2v exits without error: [root@kvm01b ~]# virt-v2v -ic 'esx://my-vmware-hypervisor.example.com/' \ -os transferimages --network default my-vm my-vm_my-vm: 100% [====================================]D virt-v2v: my-vm configured with virtio drivers. [root@kvm01b ~]# Now, my question is, rather that the [virtio-win RPM from the spec file I wrote](https://github.com/fasrc/virtio-win/blob/master/virtio-win.spec), is there some other more standard RPM in base CentOS or EPEL that will resolve the error above? Here's a bit more detail about my setup: [root@kvm01b ~]# cat /etc/redhat-release CentOS release 6.2 (Final) [root@kvm01b ~]# rpm -q virt-v2v virt-v2v-0.8.3-5.el6.x86_64 See also [Bug 605334 – VirtIO driver for windows does not show specific OS: Windows 7, Windows 2003](https://bugzilla.redhat.com/show_bug.cgi?id=605334) [v2v-guide]: http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/V2V_Guide… Thanks, Phil p.s. I also posted this on Server Fault. If you prefer to answer there, I would be happy to summarize the answers and report back to the list: http://serverfault.com/questions/395347/where-should-centos-users-get-usr-s…

1 0

shut down a Centos 6 guest / libvirt / ACPI
by Michael Kress 03 Jun '12

03 Jun '12

Hi, shutting down a Centos6 kvm guest does not work from outside doing a 'virsh shutdown vmguest', I've installed the CentOS-6.2-x86_64-minimal.iso inside the kvm guest I reckon this is related to acpi ... # dmesg | grep ACPI ACPI Error: A valid RSDP was not found (20090903/tbxfroot-219) ACPI: Interpreter disabled. pnp: PnP ACPI: disabled acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5 /proc/acpi/event does not exist # /usr/sbin/acpid acpid: can't open /proc/acpi/event: No such file or directory # grep ACPI /boot/config-`uname -r` CONFIG_X86_64_ACPI_NUMA=y # Power management and ACPI options CONFIG_ACPI=y CONFIG_ACPI_SLEEP=y CONFIG_ACPI_PROCFS=y CONFIG_ACPI_PROCFS_POWER=y CONFIG_ACPI_POWER_METER=m CONFIG_ACPI_SYSFS_POWER=y CONFIG_ACPI_PROC_EVENT=y CONFIG_ACPI_AC=y CONFIG_ACPI_BATTERY=y CONFIG_ACPI_BUTTON=y CONFIG_ACPI_VIDEO=m CONFIG_ACPI_FAN=y CONFIG_ACPI_DOCK=y CONFIG_ACPI_PROCESSOR=y CONFIG_ACPI_HOTPLUG_CPU=y CONFIG_ACPI_PROCESSOR_AGGREGATOR=m CONFIG_ACPI_THERMAL=y CONFIG_ACPI_NUMA=y # CONFIG_ACPI_CUSTOM_DSDT is not set CONFIG_ACPI_BLACKLIST_YEAR=0 # CONFIG_ACPI_DEBUG is not set CONFIG_ACPI_PCI_SLOT=y CONFIG_ACPI_CONTAINER=y CONFIG_ACPI_HOTPLUG_MEMORY=y CONFIG_ACPI_HOTPLUG_MEMORY_AUTO_ONLINE=y CONFIG_ACPI_SBS=m CONFIG_ACPI_HED=y CONFIG_ACPI_APEI=y CONFIG_ACPI_APEI_GHES=y CONFIG_ACPI_APEI_PCIEAER=y CONFIG_ACPI_APEI_EINJ=m CONFIG_ACPI_APEI_ERST_DEBUG=m CONFIG_X86_ACPI_CPUFREQ=m CONFIG_HOTPLUG_PCI_ACPI=y CONFIG_HOTPLUG_PCI_ACPI_IBM=m CONFIG_PNPACPI=y CONFIG_ATA_ACPI=y CONFIG_PATA_ACPI=m # ACPI drivers # ACPI drivers CONFIG_THINKPAD_ACPI=m # CONFIG_THINKPAD_ACPI_DEBUGFACILITIES is not set # CONFIG_THINKPAD_ACPI_DEBUG is not set # CONFIG_THINKPAD_ACPI_UNSAFE_LEDS is not set CONFIG_THINKPAD_ACPI_VIDEO=y CONFIG_THINKPAD_ACPI_HOTKEY_POLL=y CONFIG_ACPI_WMI=m # CONFIG_ACPI_ASUS is not set CONFIG_ACPI_TOSHIBA=m Any suggestions? Thanks in advance Regards Michael -- Michael Kress, kress(a)hal.saar.de http://www.michael-kress.de / http://kress.net P E N G U I N S A R E C O O L

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Eucalyptus 2.0.3 on CentOS - VM auto fail-over?
by Rafał Radecki 16 May '12

16 May '12

Hi all. I am currently testing Eucalyptus. I have two servers, one of them has CLC, Walrus, CC and NC, the second only NC. When I make a new Xen VM (from kernel, initrd, filesystem image) then it is placed on one of the nodes with NC. I would like to test VM fail-over. When on one node the VM is not running good it should be transferred to the second node as I think. Do I need EBS for that? How should eucalyptus be configured? Any howtos? I have found only basic ones with installation and starting of VM instances. Best regards, Rafal Radecki.

1 0

Remus and CentOS
by Bernd 11 May '12

11 May '12

Hi, has anybody here a setup of Xen running that uses Remus [1]? Best, Bernd [1] http://wiki.xen.org/xenwiki/Remus

1 0

bridging to a bond in KVM
by aurfalien 09 May '12

09 May '12

Hi all, Just wondering if any one has experienced problems with trying to bridge a bonded interface with your KVM guests? There may be some ARP issues as per this link; https://bugzilla.redhat.com/show_bug.cgi?id=584872 Thanks in advance, - aurf

2 2

Display and Video modes - more info
by aurfalien 30 Apr '12

30 Apr '12

Hi all, I've searched around and couldn't really find much on the subject. I am playing around with various video modes (spice, vga, etc...) while keeping the display mode to spice. Wondering why my guests defaulted to Cirrus 9MB as I don;t have that actual video adapter in my machine. And what the explanations are between video modes? I noticed vmvga doesn't work for me but rather then trial and error, it would be nice to read some docs on the subject. Thanks in advance. - aurf

1 0

virtio drivers for Centos 5.8
by aurfalien 30 Apr '12

30 Apr '12

Hi, So I updated my guest from 5.1 to 5.8 via a complete yum update, many many packages BTW. I shutdown the guest, change its "Disk bus" from IDE to Virtio and then upon boot, I get kernel panics as no disk can be found. I do get the splash screen at first however. My guest has /dev/hda, should I change its fstab to reflect /dev/vda instead? Thans in advance, - aurf

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