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• Cannot run a VM with more than three network interfaces with KVM

  - by Bostonvaulter

  I'm running KVM on top of Ubuntu 10.10 Server I can create VM's (Virtual Machine) and network interfaces fine but I cannot seem to add more than three network interfaces. As soon as I have a VM with four network interfaces it gets stuck on startup at the starting SeaBIOS page with this message: Starting SeaBIOS (version pre-0.6.1-20100702_143500-palmer) So far I've verified this with two VM's, a Ubuntu 10.10 desktop and a Vyatta router. The specific network hardware I assign to the VM's doesn't seem to matter. I'm trying to have one bridged interface and three private networks using Vyatta to route between them. Does anyone know why I can't run a VM with more than three network interfaces? Edit: Additionally the KVM thread responsible for the specific VM hangs using ~100% CPU (i.e. one core). Here's the command for the process that is hanging: /usr/bin/kvm -S -M pc-0.12 -enable-kvm -m 512 -smp 1,sockets=1,cores=1,threads=1 -name vyatta -uuid 6dff7c94-6810-423e-5fea-fec10da0e9b7 -nodefaults -chardev socket,id=monitor,path=/var/lib/libvirt/qemu/vyatta.monitor,server,nowait -mon chardev=monitor,mode=readline -rtc base=utc -boot c -drive file=/home/rams/virtual-machines/vyatta.img,if=none,id=drive-ide0-0-0,boot=on,format=raw -device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -drive if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw -device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -device rtl8139,vlan=0,id=net0,mac=00:54:00:be:cc:4b,bus=pci.0,addr=0x3 -net tap,fd=97,vlan=0,name=hostnet0 -device rtl8139,vlan=1,id=net1,mac=52:54:00:da:59:ed,bus=pci.0,addr=0x5 -net tap,fd=98,vlan=1,name=hostnet1 -device rtl8139,vlan=2,id=net2,mac=52:54:00:ce:22:b6,bus=pci.0,addr=0x6 -net tap,fd=99,vlan=2,name=hostnet2 -device rtl8139,vlan=3,id=net3,mac=52:54:00:1e:bc:46,bus=pci.0,addr=0x7 -net tap,fd=101,vlan=3,name=hostnet3 -chardev pty,id=serial0 -device isa-serial,chardev=serial0 -usb -vnc 127.0.0.1:0 -k en-us -vga cirrus -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4 Edit: I've also found an error in dmesg that might be related (it also shows up when running virtd in verbose mode): 14:47:24.399: warning : qemudParsePCIDeviceStrs:1422 : Unexpected exit status '1', qemu probably failed I've also tried disabling app armor but that doesn't seem to make a difference.

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• Virtualization at Oracle - Six Part Series

  - by Monica Kumar

  Oracle's Matthias Pfuetzner and Detlef Drewanz have written a series of blog articles that go through virtualization technologies that can be used with the Oracle stack. I highly recommend them for anyone interested in learning about what Oracle has to offer in Server Virtualization. The series includes: Part 1: Overview Part 2:  Oracle VM Server for SPARC Part 3: Oracle VM Server for x86 Part 4: Oracle Solaris Zones and Linux Containers Part 5: Resource Management as Enabling Technology for Virtualization Part 6: Network Virtualization and Network Resource Management These articles give a good technical overview of the concepts of virtualization as well as the Oracle's server virtualization solutions spanning both SPARC and x86 architectures. Happy Reading!

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• AMD Fusion GPU passthrough to KVM or Xen

  - by BigChief

  Has anyone successfully gotten a passthrough working with the GPU portion of AMD's Fusion APUs (the E-350 is my target) on top of a Linux hypervisor? IE, I want to dedicate the GPU to one VM only, excluding all other VMs as well as the host. I know PCI passthrough can work with patches / kernel rebuilds for Xen and KVM. However, since the GPU is on the same chip, I don't know if the host OS will see it as PCI. I know there are a number of tangential issues here, such as: Poor Fusion drivers in Linux at the moment Unsuccessful patching efforts seem common VT-d / IOMMU is required and (from my reading) is supported on the APU, but the motherboard may not offer it KVM doesn't appear to support primary graphics cards, only secondary graphics cards (described here) However, I'd like to hear from anyone who has messed with this, even failed attempts. Fedora + KVM is my preferred virtualization platform but I'm willing to change that if it makes a difference. EDIT: The goal is to do this for a Windows 7 guest (I know it's asking a lot). Regardless, just assume this is HVM, not PV.

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• KVM slow guest i/o

  - by Akarot

  Host: Debian 6.0 (squeeze) with qemu-kvm and libvirt from squeeze-backports ii qemu-kvm 1.0+dfsg-8~bpo60+1 ii libvirt-bin 0.9.8-2~bpo60+2 Has 3TB sata drives with software raid and lvm. It has a sequential write speed of ~140MB/s measured with dd bs=1M count=512 if=/dev/zero of=test conv=fdatasync Elevator set to cfq Guest Debian 6.0 (squeeze) Uses LVM as storage. Drivers are virtio and cache='none' Sequential write speed is considerably slower with only 25-50MB/s Elevator set to noop I'm kind of running out of ideas for further tweaks but I'm sure that I/O speed should be much faster because many people are reporting almost native performance with lvm.

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• What is the best distro to host a KVM virtualization solution

  - by elventear

  I am looking for a Server oriented distro that we can expect have decent support but also offer as much as possible some of the latest features that KVM might offer. I am leaning towards Ubuntu LTS 10.04, because well it's LTS and more bleeding edge, but I find Ubuntu not serious enough in terms of support (I say this a heavy Ubuntu user). Given that Centos 6 is not out yet, I am not sure if going Centos 5 would be the best option in terms of getting more features from KVM. Any other distro you would recommend that could meet the criteria of long term support? (At least 4 years)

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• KVM CLI install for CentOS 6.3 defaults to Minimal Install

  - by i.h4d35

  So I now I've installed KVM (and its associated tools and packages- libvirt, VMM etc.). On the GUI (i.e using the VMM), installation works as its supposed to. However, when I try to create a VM using the command line interface, the OS (I am working with CentOS 6.3) defaults to a Minimal Install instead of giving me options to choose from at the time of installation. I am trying to install using the following command: virt-install \ --connect qemu:///system \ --virt-type kvm --name testVM2 \ --ram 512 --disk path=/var/lib/libvirt/images/testVM2.img,size=8 --vnc \ --cdrom /media/db18de8e-0853-49fb-80de-5c794d58a46f/CentOS-6.3- x86_64-bin-DVD1.iso \ --network network=default Specifying the OS-type or the OS-variant parameters doesn't make a difference. Is there something that I am missing out on or some other parameter that I must specify? Thanks in advance.

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• Best practice for system clock sync on KVM host

  - by Tauren

  I have an Ubuntu 9.10 server running as a KVM host with ntpd installed on it. The host system has the correct system time. At the moment I only have a single KVM guest, also Ubuntu 9.10 server. I do not have ntpd installed on it, and I just discovered the clock is about 6 minutes slow. It wasn't that way when it was installed about a month ago. I thought that I only needed to keep the host clock synchronized and that the guests used the host clock. But maybe that is a memory from using OpenVZ. I believe the reasoning was related to only the host could modify the physical system clock. Is running ntpd on both the host and all the guests the correct thing to do? Or is there something else that is preferred? How should I keep the guest clocks in sync?

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• Turning a running Linux system into a KVM instance on another machine

  - by Charles

  I have two physical machines that I wish to virtualize. I can not (physically) plug the hard drives from either machine into the new machine that will act as their VM host, so I think that copying the entire structure of the system over using dd is out of the question. How can I best go about migrating these machines from their hardware to the KVM environment? I've set up empty, unformatted LVM logical volumes to host their filesystems, with the understanding that giving the VMs a real partition to work with achieves higher performance than sticking an image on the filesystem. Would I be better off creating new OS installs and rsyncing the differences over? FWIW, the two machines to be VM'd are running CentOS 5, and the host machine is running Ubuntu Server 10.04 for no particularly important reason. I doubt this matters too much, as it's still going to be KVM and libvert that matter.

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• KVM swtitch , screen resolution problem

  - by Vagelism

  I use the lates ubuntu version. Till to day I use it with an acer trravelmate4070 and an LG screen in order to expand my destkop. Works great. Till today that I desided to connect my LG screen to a KVM switch in order to share the big screen with an other pc when I need it. In the KVM switch the resolution is lower and I can not manually change it. I read many solutions about making an .conf file but since I am new to Ubuntu I am afraid , more over I realized that these articles talk for the same problem but not as an expantion screen but as a main screen. Any idea how to config correct this file? I send the links of these articles here: http://robert.penz.name/219/workarou...-kvm-switches/ Where is the X.org config file? How do I configure X there? Thank you!

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• What are the major advantages of Microsoft virtualization products over other(Citrix, Vmware, IBM) v

  - by Kushal Waikar

  What are the major advantages of Microsoft virtualization products(hypervisor products) over any other(Citrix, VMware, IBM) virtualization products in the market ?

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• Reverse KVM solution

  - by aksamit

  I need to setup a computer so that it can be operated from two locations. The locations are about 20 meter from each other and the user wants the experience to be the same from both locations, i.e. no remote desktop or anything like that and preferably a seamless switch. So basically I need a double set of, monitor, keyboard and mouse, and then of course link it together by some kind of suitable hardware.

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• How to route KVM virtual machine audio to Ubuntu 11.10 host using virt-manager?

  - by iGadget

  I've been using KVM in combination with Virt-Manager and Remmina at a fair success up until now. The issue I need to solve now is to get audio from a virtualized Windows XP and make it audible on the Ubuntu 11.10 host. Remmina / RDP works for 'simple' audio (system sounds and such), but when the source gets trickier (e.g. Flash audio), Remmina / RDP messes up. So I figured I'd just connect to the machine directly using Virt-Manager. Unfortunately, it seems that even though I have successfully configured the AC97 audio device on WinXP, it's unable to get it's output to the Ubuntu host. This is probably because Virt-Manager uses VNC (and AFAIK, VNC doesn't transport audio). Does anyone know if there is a solution to fix this? I've heard of Spice, but the installation required so much voodoo last time I checked, I figured I'd let that solution boil to maturity a little longer ;) But perhaps there are other options I haven't thought of yet (which don't require switching to VirtualBox / VMware)...

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• Difference between Xen PV, Xen KVM and HVM?

  - by JP19

  Hi, I know that Xen is usually better than OpenVZ as the provider cannot oversell in Xen. However, what is the difference between Xen PV, Xen KVM and HVM (I was going through this provider's specs? Which one is better for what purposes and why? Edit: For an end-user who will just be hosting websites, which is better? From efficiency or other point of view, is there any advantage of one over the other?

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• Xen or KVM? Please help me decide and implement the one which is better

  - by JohnAdams

  I have been doing research for implementing virtualization for a server running 3 guests - two linux based and one windows. After trying my hands on Xenserver, I am impressed with the architecture and wanted to use the opensource XEN, which is when I am hearing a lot more about KVM, about how good it is and it's the future etc. So, could anyone here please help me answer some of my queries, between KVM and XEN. Based on my requirement of three VMs on one server, which is better for performance - KVM or XEN, considering one the linux vm's will works a file-server, one as a mailserver and the third one a Windows server? Is KVM stable? What about upgrades.. What about XEN, I cannot find support for it Ubuntu? Are there any published benchmarks on both Xen and KVM? I cannot seem to find any. If I go with Xen, will it possible to move to KVM later or vice versa? In summary, I am looking for real answers on which one I should use.. Xen or KVM?

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• LSI 9211-8i won't boot in KVM

  - by Paul McMillan

  I'm running ubuntu 11.04 with an LSI 9211-8i in IT mode with the latest firmware (10). I'm using KVM with VT-d enabled to pass the entire PCIe device through to the guest OS. I have the device disabled in the system BIOS. When I boot my virtual machine, the adapter quits during bios initialization with the following error: Unable to load LSI Corporation MPT BIOS MPT BIOS Fault 0Ch encountered at adapter PCI(00h,04h,00h) Press any key to continue... I know the virtualization is correctly enabled. I've blacklisted the kernel modules in the host OS. Has anyone else encountered this error? I'm about out of ideas here. Edit: I contacted LSI tech support about this, and they suggested that I try RedHat and Xen. Apparently they don't test or support anything else.

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• NFS and KVM. Slow Speed

  - by Javier Martinez

  I have a KVM virtualization in Debian with 2 guests (Debian and Windows 2008). I want to have a 'mount point' shared that can be accessed by the 3 system (host and 2 guests) at the same time. So the only thing that I found was a NFS/SMB network storage. I picked NFS Due to my Ethernet network (10/100), the speed average that I get between accessing/transfering files between the 3 system is always 8~10MB/s. The point is if is there any chance of get a boost system for sharing files between 3 system (at the same time) without wasting the speed of my SATA disks. I mean, without the Ethernet limitation of 10 MB/s

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• kvm memory changes via virsh not propagating to vm

  - by kevintmckay

  Hi I just started using kvm on rhel6 and after creating a vm I tried to increase the memory but the changes I amde in the xml file do not propogate to vm, even after bouncing vm and restarting libvert? [root@kvm01 qemu]# virsh dominfo dev-kvm01 Id: 2 Name: dev-kvm01 UUID: 9b2bf581-2807-3116-b176-60e9c0559943 OS Type: hvm State: running CPU(s): 2 CPU time: 1975.3s Max memory: 7864320 kB Used memory: 7864320 kB Persistent: yes Autostart: disable Security model: selinux Security DOI: 0 Security label: system_u:system_r:svirt_t:s0:c47,c760 (enforcing) [iknowmed@dev-kvm01 ~]$ free total used free shared buffers cached Mem: 3632284 3614508 17776 0 3980 3491676 -/+ buffers/cache: 118852 3513432 Swap: 5668856 0 5668856

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• TCP/IP performance tuning under KVM/Qemu

  - by vpetersson

  With more and more companies switching to public cloud services, I'm curious what you guys' thoughts are on TCP/IP tuning in the cloud. Is it worth bothering with? Given that you don't have access to the host-server, you're somewhat limited I presume Let's say for the sake of the argument that you're running three MongoDB-servers in a replica-set on FreeBSD or Linux that all sync over an internal network. I'd also be curious if anyone made any actual performance benchmarks to back up their arguments. I benchmarked the various network drivers available for KVM/Qemu here, but I'm curious what the gurus here suggest to tune further. I started playing around a bit with the tuning-recommendations as suggested over here, but interestingly enough I saw a decrease in performance, rather than an increase, but perhaps I didn't fully understand the tweaks. Update: I did a few more benchmarks and posted the result here. Unfortunately the result wasn't really what I expected.

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• KVM/Qemu Guest Shutdown problems

  - by Gaia

  on both host and guest running CentOS 6.3 with KVM/Qemu virtualization, I have the following scenarios: "virsh shutdown kvm1" did not shutdown at all. virsh lists guest as running. "service libvirt-guests stop" did not shutdown in 280 seconds (shutdown_timeout=300. on_shutdown=shutdown) "shutdown now" from within guest, guest becomes unreachable. virsh lists guest as running, though it could not connect to it. "shutdown -h now" from within guest works. "shutdown -r now" from within guest works. Libvirt logs show nothing for the first 3 scenarios. I can pause the guest fine. Bottom line, I cannot shutdown from outside the guest. What do I check to figure out what is going on?

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• Free Oracle Special Edition eBook - Server Virtualization for Dummies

  - by Thanos

  Oracle has released a quick and easy-to-read guide on Oracle Virtualization. Now available is "Server Virtualization for Dummies," an Oracle Special Edition eBook. Need to virtualize, but not sure where to start? Virtualization should make things simpler, not more complex. To learn more about how Oracle’s server virtualization solutions can help you eliminate complexity, reduce costs, and respond rapidly to changing needs, download Server Virtualization for Dummies, an Oracle Special Edition eBook. Simply discover how virtualization can make things simpler, from server consolidation to application deployment. This eBook guides you through a range of server virtualization topics, including Why virtualization is critical to transforming today's IT to tomorrow's cloud computing environment. How different types of virtualization are suited to different business needs How application-driven virtualization dramatically accelerates application deployment Oracle Virtualization delivers the most complete and integrated solution for building, flexible IT infrastructures—beyond just server virtualization consolidation. Learn how Oracle Virtualization's unique application-driven approach and integrated management offering helps to accelerate enterprise application deployment and simplify management of data center from disk to apps. All our Customers, prospects, and partners are welcome to follow this link to download an exclusive copy of Server Virtualization for Dummies, Oracle Special Edition today.

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• SmartOS Virtualization with one public IP address

  - by matejkramny

  Is it possible? (title of this question) Googling Virtualization with one public IP address yields nothing useful What I have: SmartOS on a dedicated server. Dedicated server has one public IP address. What I want to do: Host multiple guest OS from that server Problem: Access to the guest through the (server that virtualizes the guest)'s IP address. Is this possible at all? Sorry, newbie to all this Research http://www.machine-unix.com/beginning-with-smartos/#comment-7256 Does not solve my problem - the guide sets up an internal IP http://blog.bgentil.fr/smartos-use-global-zone-as-gateway-for-guests.html Ideas Perhaps it is possible to do host-based translation like with nginx proxy?

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• Flexible virtualization infrastructure Design with libvirt

  - by Lessfoe

  I'm going to install a CentOS6 Server with Virtualization ( libvirtd ) capabilities on a DELL Server with Hardware RAID5 of around 6T of disk space ( It has 4x2T disks in a PERC700 RAID Controller ). I'm going then to install some guests which requires few resources except one that needs 500GB of disk space, 8/16GB of RAM and good performances. I was thinking about file images for guests storage but I'm not sure about the 500GB VM what needs good performances so that an LVM device could be better. So my question is what would be the best layout concerning: RAID setup ( RAID5, RAID1 + 1 disk for OS only. ) disk partitioning ( using the entire disk/ leave free space for future use and extending it with LVM ) guests storage management ( LVM devices or file images ( considering the 500GB VM that is performance demanding ) or mixed ) Where to put guests storage? /var/lib/libvirt/images or maybe in a custom dir separated from system /home/VMs Thanks in advance for any hint.

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• Virtualization of desktop

  - by Agares

  Hi! I'm thinking about virtualization of my laptop(for educational purposes). My idea is to install very light host OS and have all the rest as virtual machines. Microsoft's Hyper-V Standalone would be very good solution, but it's impossible to access virtual machine from computer, where the Hyper-V is the host(isn't it?). So, which virtualization software would be good for me? I wanna have virtualized Windows 7(and maybe some other windowses). My processor support Intel Virtualization Technology.

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• Installing and running a guest OS on KVM-qemu with only serial console access

  - by nixnotwin

  I am trying to installing a bsd distro with virt-installer. With a Linux distro I used this: virt-install -n debian -r 1024 --vcpus=1 --accelerate -v --disk /var/kvm/installation-disks/debian.img,size=6--nographics --network=bridge:br0,model=ne2k_pci,mac=52:54:00:66:68:09 -l http://ftp.de.debian.org/debian/dists/squeeze/main/installer-amd64/current/images/ -x console=ttyS0,115200 This loads the installer directly from the online mirror. With Fedora I used this mirror: http://www.nic.funet.fi/pub/mirrors/fedora.redhat.com/pub/fedora/linux/releases/16/Fedora/x86_64/os/ Are there such mirrors for freebsd or openbsd? The reason I want direct installable ftp/http mirrors is because I can access my physical server only via ssh, and it doesn't have a X server or a window manager to give me a VNC GUI. When I tried installing centos 6 with an online mirror I was able to finish the installation via serial console, but after I rebooted it, the serial console never worked for me. I tried everything possible---editing menu.lst, inttab and securtty files. Fedora 16 booted fine from serial console, but got stuck when it loaded anaconda installer. I tried editing freebsd iso installation media by adding serial console option to boot option. And installation was successful. But couldn't boot into it becuase it wasn't giving console acess. I couldn't edit any files as ufs partition cannot be loaded with write access on my Ubuntu server 10.04. Only debian squeeze worked well, it worked for me even without editing a single configuration file. I want to have CLI versions of fedora/centos and freebsd/openbsd. But, looks like there isn't any hope for me to have them, as I have to depend on a serial console to do everything.

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• How do you get the IP addresses of KVM guests that are using a Bridge Network Device from the KVM host

  - by slm

  Does anyone know of a way using KVM to find out the IP addresses of KVM guests that are using a bridge interface (br0) through the KVM host? Currently I have br0 setup with a single NIC (eth0) included. The KVM host is a system running CentOS 5.6 in case that matters. The guests are also running CentOS 5.6. BTW, the guests do not just show up in the KVM host's arp table, I'm looking for better solutions and/or leads.

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