KVM (for Kernel-based Virtual Machine) is a full virtualization solution for Linux on x86 hardware containing virtualization extensions (Intel VT or AMD-V). It consists of a loadable kernel module, kvm.ko, that provides the core virtualization infrastructure and a processor specific module, ...

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Centos/OVH: public IP on KVM virtual machine

Since a few days, I'm trying to configure my KVM vm to have a public IP address, without any success. First, I'm on OVH, and you need to know they don't allow networking from different mac addresses. ...
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169 views

Multiple IPs on eth0, bridging to VMs and routing

Current situation: I have a host running 3 virtual machines. One IP for eth0 (xxx.xxx.xxx.239) and one additional for eth0:1 (yyy.yyy.yyy.35). This works fine for me... Host (eth0) (xxx.xxx.xxx.239) ...
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493 views

iptables and virtual machines of KVM, no ping, no ssh from VMs

Hi everyone :) I have two virtual machines KVM. I did two alias to eth0 - eth0:0 and eth0:1 and put them on an external IPs (eth0:0 - 89.114.122.3, eth0:1 - 89.114.122.4)​​. Now the problem is: ...
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177 views

View Desktop of all currently logged in Users on Windows Server

Were running Windows Server 2008 R2 Enterprise in a small research project at home. We need multiple users running Software in the background. For Monitoring purposes I'd like to have the ability to ...
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334 views

Opennebula KVM onevnet

I am experimenting with Open Nebula and KVM and so far I have a frontend and a few hosts (all hosts have two NICs for redundancy). I know that KVM makes on the hosts a virtual interface virbr0. ...
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357 views

Give a KVM Guest only access to OpenVPN

I'm in a kind of weird situation where I need to do the following: Connect an OpenVPN tunnel with static RFC1918 IPs (think of 10.3.3.1 for the server end and 10.3.3.2 for the client end) and have it ...
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298 views

CPU usage is very large in top command of Linux

I run SUSE Linux Enterprise Server 11 SP1 in a virtual machine. The hypervisor is KVM. There is 4 virtual CPU cores for the VM. Now there is a very strange thing. In theory the maximum CPU usage ...
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428 views

Shared storage for VMs without dedicated storage server

On a legacy project I've got 4 physical machines (servers, PM's) where each server has access to the SAN and fixed-space by it's own two devices (via device-mapper multipath). The local disks of the ...
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137 views

Virtualization queries

I am virtualization newbie. Please advise on these questions. Please note using a commercial VM software like Citrix or VMware is not a choice for me. I have at my disposal couple 2x 4 core servers ...
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34 views

openvswitch with multiple vlans

I'm having an issue wrapping my head around a setup. We currently use vmware+vsphere and switching to kvm. So we want the similar type setup using openvswitch. So our setup will be like kvm host ...
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32 views

unable to open KVM when trying to VNC

I am trying to open a KVM session after connecting to the remote host through VNC Scenario: Server: 192.184.148.52 having a VNC server running at 192.184.148.52:2 with XYZ username and has a KVM ...
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74 views

Linux - KVM - very slow disk io

The I/O performance of my new server is pretty low. I Googled and tried everything I can imagine. First of all, here are the Hardware Components: AMD Opteron(tm) Processor 6344 4x Seagate ...
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31 views

How to start a new instance of QEMU based on the same image and snapshot?

I have a QEMU image (qcow2) with a snapshot stored in it. Right now I'm using libvirt to start it. However, I want to be able to run more than one instance of the same image+snapshot. I guess I can ...
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109 views

dnsmasq(as DHCP server) isn't working in KVM+libvirt envirmont

I'm using dnsmasq as DHCP server in VM environment. But It didn't working. I disabled basic DHCP feature in libvirt. <network> <name>default</name> ...
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61 views

check a vps guest memory usage and CPU usage

I have vps guests that are managed by KVM and libvirt. Using virt-df, I am able to check the real disk usage of each vps guest. #virt-df [--options] -d domname Is there a similar utility tool to ...
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75 views

Ping (DUP) with Linux bridges and tap devices

http://imgur.com/qPoy2QJ I have two Linux (Ubuntu 12.04) VM (running on KVM) that networked together using two Linux bridges as shown above. The network interfaces are Linux TAP devices. The problem ...
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26 views

DHCP error when creating a kvm ubuntu image

I'm trying to create a new ubuntu image in kvm using Virtual Machine Manager. I select "CDROM" ad the installation media and insert an Ubuntu CD into the drive. When I hit "Create" the newly created ...
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128 views

Tap interface within a virtual machine has NO-CARRIER

I am trying to hook up a virtual machine to a host using openvpn. When i create a tap interface within the virtual machine using: /usr/sbin/openvpn --mktun --dev tap1 The state of the tap interface ...
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99 views

Slow VM installation on KVM

I have a standard (not modified) KVM+libvirtd installed on clean Centos 6 machine with 8G of RAM and 8 cores CPU. When I am trying to install guest centos 6 using virt-manager it takes ages to finish ...
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683 views

KVM: port forwarding to guest VM

I'm using KVM on Debian wheezy. I want to connect to the guest using ssh with the command ssh 1.2.3.4 -p 10122. What I do is: root@host$ iptables -t nat -A PREROUTING -p TCP --dport 10122 -j DNAT ...
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881 views

Booting Ubuntu as VM with KVM on Ubuntu 12.04

I am trying to boot my very first VM using KVM. I have Ubuntu 12.04 installed, i made sure the BIOS had the right virtualization flag enabled for intel processor by running kvm-ok. I have researched ...
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414 views

KVM guest with acpi installed will not shutdown

I have KVM installed and working on my Debian 7.1 host with two Debian 7.1 guests and some Windows XP guests. When I shutdown using the command 'virsh shutdown ' or hitting the shutdown button in ...
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115 views

KVM permission denied on qcow2 disk over NFS

CentOS 6.3 running libvirt 0.10, trying to access/run a vm using a qcow2 on a Windows Server 2008 NFS mount. I tried nfsvers-3 when mounting but not luck, I get permission denied, presumably because ...
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65 views

KVM console with scrollback

I'm running a Linux guest on a Linux host with kvm -display curses. I'm not able to scroll back with Shift-PageUp. Is there an even simpler display than curses which just prints to the host terminal, ...
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111 views

Why don't the symbolic links in kvm autostart not work

I've deployed 2 kvm guests( db and app) on a Debian7 host. I can set them autostart by root@mhost:~# virsh autostart db root@mhost:~# virsh autostart app This actually creates 2 symbolic links at ...
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122 views

Exporting a snapshot in KVM to create a clone ala Hyper-V 2008

Hyper-V has a nice feature of allowing a snapshot of a VM to be exported, meaning a new VM is created with the state of that snapshot. How can the same be accomplished in KVM ? Qcow2 images on ...
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130 views

add a cgroup controller into libvirt

libvirt by default has cgroup controllers of ["cpu", "devices", "memory", "blkio", "cpuacct"] as shown in qemu.conf. I want to add one more controller of net_cls. I tried to modify the config file to ...
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65 views

Keep guest time after shutdown using KVM/libvirt

I use KVM/libvirt based virtualization. Some of vm guests have set date far in future (2-3 years, different month, day, etc) After each guest shutdown down, the date is being set to host date ...
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377 views

OpenStack Instance not using up full space

I have created new instance with Centos 6.4 with 20 GB Disk Space but when i logging to the VPS and Execute df -h the space shown as the following Filesystem Size Used Avail Use% Mounted ...
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78 views

Finding out the location order of tap interfaces in KVM VM (Libvirt)

I have inserted 8 tap interfaces in a Cisco Libvirt xml file that will create a guestmachine running Ciscio iOs image: <interface type="ethernet"> <start mode="onboot" /> <target ...
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127 views

KVM Virtual windows7 Paused on starting in Centos

I'm running CentOs 6 and just installed Windows7 in KVM Virtual Machine Manager, But when starting the win7 virtual machine then goes to pause mode , the following content of our win7 xml file : ...
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413 views

Ubutu/KVM: High iowait on guest nodes, root node fine

Recently one of my boxes has been running quite slowly. It's running Ubuntu 12 LTS and kvm to split the server into several nodes. The box has 2 normal SATA drives using software RAID-1. One of the ...
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164 views

kvm/qemu via libvirt on CentOS - pass string or key/value or file to guest

I have a sizeable deployment of qemu/KVM VMs already, managed through libvirt. They're all CentOS 5 or 6 hosts and guests (the kernel lacks the 9p filesystem flags, so the "mount" shared filesystem ...
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1answer
103 views

virsh snapshot-create persistent through reboot/ domain destroy-start

If i take a snapshot of a qcow2 image backed domain via virsh snapshot-create domainID and I shutdown the machine (and probably destroy the domain if virsh list still shows it running), will that ...
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1answer
177 views

KVM USB Passthrough Performance

I have a CentOS 6.4 KVM host. I also have an ESXi 5.1 host. Under ESXi I am running a Ubuntu 12.04 guest with a USB TP-Link WN722N Wifi dongle. The Ubuntu guest runs an access point using hostapd. The ...
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94 views

Packets not going through Linux Gateway

Host: centos6 with ip 10.10.11.36 and gateway 10.10.11.33 Guest two vms with ip 10.10.11.60 and 10.10.11.57 and gateway of that of host ie 10.10.11.36 On host packet forwarding is enabled. from ...
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1answer
111 views

What is th tap100i0 device on my debian with KVM?

I want configure a network for virtual machines on KVM. I created a bridge. But I found a new tap100i0 devise was created. Should I take it into account to get the virtual network running?
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184 views

What are the differences in the configuration of the network on Proxmox (KVM)?

I have a dedicated server, one main public IP from /27 and two single public IPs also from the same /27 (I think the provider manages single IPs using the VLAN tags). I want to have a KVM running on ...
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1answer
49 views

KVM: RHE 4 guest hang for multi task usage

I want to host an old RedHat Enterprise Linux 4 with a 2.6.9 kernel on a Debian 7 core2duo host. The RHEL4 was originally deployed on a physical server and used only for development on old software, ...
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1answer
105 views

Equivalent of VMwareResolutionSet.exe for Linux KVM

My company is planning on migrating from our current VDI environment that runs on VMWare and uses HP's RDS protocol, to a solution that is based on Linux KVM/Openstack. Many of the employees use ...
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46 views

looking for a fast way to copy a template to a KVM guest

My KVM guests each has a logical volume on the host to be the entire virtual disk. What will be a fast way to copy a template over to the guest's virtual disk? I tried to create a lzop compressed file ...
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1answer
517 views

CentOS/KVM-libvirt: Public IP on VMs

I'm trying to set up a working vm with public ip adress, but I can't get it working. Here's my config : Network: range: 101.110.22.41 - 45 netmask: 255.255.255.248 gateway: ...
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1answer
407 views

KVM guest clock sync with host

I'm running KVM w/ centos 6.x. My guest vm clocks are booting with a 1-2 second lag from their host. My clocksource for the host is ntp. My clocksource for the guest is "kvm-clock", but I need to ...
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74 views

KVM copy contents of image into raw smaller LVM2 partition

I have a KVM guest, running on a KVM host...both Gentoo Linux. The guest is called webserver.img. It is 21 gigs large, but I am only using 5 gigs inside the image. I want to make a logical volume ...
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122 views

virsh attach-device for serial device

I would like to add a serial device (console) to a guest via the virsh attach-device command. I have a console.xml file containing: <serial type="pty"> <target port="0"/> ...
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1answer
152 views

IPMI console redirect (KVM) via java applet causes multiple keystrokes

I'm using a dell c6100 and can connect to the web based IPMI management tool, and I can get console redirection running via the java applet. But many keystrokes (especially enter) generate 2 or more ...
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161 views

gateway configuration in kvm guest while live migration

I configured the bridge which are connected to guests to communicate with outside. And In the guest, i configure gateway to indicate the bridge IP. (currently achieve this with DHCP) eth0 <--> ...
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56 views

Channelling DOM0 internet connection through DOMU

Bit of an odd queston but wanted to know your opinions on the following: I have a small computer that has Ubuntu (Both DOM0 and DOMU) virtualized using KVM. Now the person that will handle this ...
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82 views

how do I add a vcpu to one of my KVMs in QEMU?

I want to add a vcpu to a virtual server in QEMU. I tried editing the XML file in /etc/libvirt/qemu and starting the server, but that does not seem to work.
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45 views

Interface to comunicate with virtual qemu-kvm machine

I am starting virtual machine with command: /usr/bin/qemu-kvm -M pc-0.15 -cpu core2duo -smp 2 -m 2048 -name something -hda /path/to/disk.img -net nic -net user This machine get IP 10.0.2.15/24 ...