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, ...

learn more… | top users | synonyms (4)

0
votes
0answers
2 views

Windows guest on KVM/Qemu suffers horrible key lag

Host OS is Arch Linux with the following versions:- qemu 2.1.0-2 libvirt 1.2.7-1 linux 3.15.8-1 Guest OS is Windows 7 64-bit. This problem did not exist when I first created this VM and started ...
2
votes
2answers
1k views

proxmox KVM routed network with multiple public IPs

I have a dedicated hosting with hetzner. Additionally i have bought a 6IP subnet. My main IP is: 148.111.111.200 My main subnet is: 255.255.255.224 My additional IPs are 148.222.222.1 to ...
0
votes
1answer
42 views

KVM Dynamic Rate Limiting

How can I dynamically rate limit the network speed on individual KVM instances? For example, I want to set a rule where if a user uses over 100mbps inbound or outbound bandwidth for over 30 minutes, ...
1
vote
2answers
686 views

Wake-on-lan to trigger virtual-machine with kvm and libvirt

I'm doing virtualization with KVM and managing via the Libvirt daemon. How do I start a virtual machine via wake-on-lan?
0
votes
1answer
104 views

Networking issues KVM

I have a server that is running Debian 7.2. I recently set up KVM on it, and created two VMs. Both VMs are unable to connect to the Internet. I was following a tutorial, and I'm certain I followed the ...
-1
votes
1answer
350 views

ubuntu's average load never below “0.00 0.01 0.05”

I have several ubuntu 12.04 VMs running on a ubuntu 12.04 KVM host. Those of the virtual machines that are totally idle with no services (except syslog and the other "small" standard stuff of a fresh ...
0
votes
1answer
17 views

KVM - Changing Memory of Guests Live

I have a KVM guest that I would like to dynamically change the memory allocation of. At the moment, to change the memory of the guest, I have to run: sudo virsh edit $GUEST_DOMAIN Then change the ...
0
votes
1answer
33 views

How to speed up QEMU on Windows host?

We want to run our Ubuntu 64bit web server virtualized/emulated on a Windows 64bit host. Intended use is to distribute the VM to customers who might not have "elevated" or "admin" rights on the ...
3
votes
2answers
3k views

set tap0 using virt-manager for bridged wireless

After 3 days I finally have kvm guests working on the network via wireless (link below - thanks!): My network is 192.168.1.0/24 on the host: sudo sh -c "echo 1 > /proc/sys/net/ipv4/ip_forward" ...
0
votes
1answer
35 views

Online resizing of kvm guest root filesystem?

I have a Linux guest that uses an LVM volume directly as root file system (that is, there is no partition table). libvirt config looks thus: <os> <type arch='x86_64' ...
2
votes
1answer
93 views

Poor network performance with KVM (virtio drivers) - Update: with vhost_net

I've set up several KVM based networks before, and never encountered this issue, can't for the life of me think what I'd have set up differently previously. Setup Basically, Ive got and entirely ...
-1
votes
2answers
68 views

SSH Public Key Authentication only works if active session exists before

I have a rather strange problem with my SSH configuration. I set up my server with the help of a Remote Access Card and configured everything with a KVM viewer. So while being logged into the server ...
8
votes
2answers
5k views

free up not used space on a qcow2-image-file on kvm/qemu

we are using kvm/qemu with qcow2-images for our virtual machines. qcow2 has this nice feature where the image file only allocates the actually needed space by the virtual-machine. but how do i shrink ...
1
vote
1answer
289 views

Windows Server 2012 on KVM on Ubuntu 14.04. Runs well for a while and then slows down

I have Windows Server 2012 Essentials running as a VM on KVM running on Ubuntu 14.04 LTS. It performs very nicely after a reboot but after a while it starts slowing down and getting sluggish. This ...
1
vote
2answers
19 views

Any suggestions on setting a vswitch to allow a kvm guest to pxe install from an external boot server?

Any suggestions on setting a vSwitch to allow a kvm guest to pxe install from an external boot server? I'm trying to configure a vSwitch, in Fedora 20, so that I would be able to do a net-install, of ...
1
vote
2answers
705 views

Service networking restart not working on ubuntu

This one has been cracking my head for quite a bit and I can't seem to find a decent answer for it, hoping you guys can shed some light to it... # Loopback interface: auto lo iface lo inet loopback ...
1
vote
2answers
56 views

How to setup IPTables on KVM host - iptables-persistent is being ignored

I'm trying to setup some specific IPTables rules on an ubuntu 14.04.1 host that runs some KVM guests. The box has multiple NICs with multiple IP addresses and the guests use different addresses based ...
0
votes
1answer
34 views

KVM Ubuntu Guest cannot connect to the internet on bridged networking

I have Ubuntu 14.04 (64 bits) + KVM Host with 2 NICs: - eth0 connected to the "public" network - eth1 connected to the br0 bridge with a private ip address range From Host I can access internet, ...
1
vote
1answer
725 views

Assign ipv6 address to KVM guests on bridge mode

System: CentOS 6.5 Network: Bridge on br0 IPv6: ISP Native /64 block. IPv4: ISP address (not internal LAN) Purpose: To assign IPv6 only to guests (manually), I don't want ipv4 address to be ...
0
votes
2answers
1k views

linux KVM guests network performance is slower than host

i have a KVM linux based virtual machines, as the network performance of the host is running perfect with 1 Gbps (on the internal network) and using iperf tools it show that the network is running ...
0
votes
1answer
679 views

Error while creating VM using virt-manager on Xen

After a great struggle I got my XEN installed now I am using virt-manager and trying to create a VM. Since my H/W doesnt support full Virtualization using the Para Virtualization installation over ...
1
vote
2answers
40 views

Migrating Hyper-V VM's to CentOS 6

I have tried to search this around in google, but I haven't actually found anyone migrating from Hyper-V (Windows) to CentOS 6, only the other way around. So, I was wondering if there are any pointers ...
0
votes
2answers
41 views

What does cpu-pinning mean in context of KVM hypervisor with multiple virtual machines

I am looking at configuring a KVM hypervisor to have some virtual machines. THe KVM hypervisor has 8 physical cores (16 with HyperThreading). I want to create 8 virtual machines on it but I am not ...
2
votes
0answers
282 views

What is the preferred clocksource for a kvm guest running debian?

Our development server is running debian 4.0 (etch) as a guest under KVM. For the longest time, it had sporadic issues where many processes would appear to just hang. We finally found the issue - the ...
0
votes
1answer
1k 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 ...
1
vote
0answers
26 views

Virtuall Manager : CentOS Guest Install Garbled Text

I'm trying to install CentOS 6.5 with virtual manager but the menu is garbled. Host machine is running on Debian Wheezy. Thank you in advance.
0
votes
1answer
1k 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 ...
2
votes
3answers
6k views

How do I migrate a KVM guest from host to another?

I have a KVM guest that I need to migrate from one host to another. The migration does not need to be done hot. Its storage is currently backed by LVM block devices, with a bridged network adapter. ...
0
votes
3answers
233 views

qemu don't start quest with disk image on tmpfs

I have 32bit windows 2k3r3 guest (terminal server) with 4GB guest ram and swapping. I created separate disk image for guest swapping and user's temp dirs. I have enouth RAM in host system and want ...
0
votes
1answer
34 views

EL6/KVM guest dies with “pthread_create failed: Resource temporarily unavailable”

I've got a CentOS 6.5 x86-64 KVM server with a bunch of guest VMs of different breeds, mostly EL5 and EL6. However one and only one of them keeps crashing every couple of days with: pthread_create ...
-4
votes
0answers
34 views

How to extend disk space to the LVM filesystem of a kvm virtual machine [on hold]

I am having a vm where I need to add some more disk space. The VM was created using LVM. I would like to add some disk space on /dev/mapper/vg_hosting4-lv_root How can i do this exactly? I can ...
0
votes
1answer
64 views

kvm- launching VM through putty

I want to setup a VM (host:ubuntu server / guest ubuntu server) I connect through putty (from windows) to my server and launch the following commands: #create the guest image qemu-img create -f ...
1
vote
2answers
59 views

Xen PV, Xen HVM and KVM

Am I correct that you can boot up any operating system with either of these virtualization types as they act as a bare metal machine and compile your own kernel? I am looking to switch over from ...
-1
votes
3answers
39 views

Determine if IPs are backed by VPS

Is there any way to determine if IPs are backed by actual VPSes? For example, a VPS host receives a /22 block of IPs. He puts them on his server and requests more, but you want to verify that each IP ...
-1
votes
1answer
27 views

KVM unix socket file permission for VNC

I'm using kvm-qemu/libvirtd for a bunch of kvms. I'm using vnc for the graphical interface. By default, it listens on a tcp socket. I want to have it listen on a unix socket instead. Looking at some ...
0
votes
1answer
1k views

How to limit usb 2.0 port to work as usb 1.1 in ubuntu?

Ive got problem with kvm usb forwarding and printing (windows xp guest goes BSOD when i try to print something). Ive been adviced to change usb to 1.1 version. That only kvm works with 1.1 not 2.0 ...
1
vote
0answers
40 views

How do I get IPv6 packets to my KVM virtual machine?

My setup is: Debian Wheezy x64 on the host and on the guest. I am using a tun/tap setup to connect a virtual machine to the host. The KVM network options I use are: -net ...
3
votes
3answers
2k views

ipv6 with KVM on debian

I have trouble setting up IPV6 on my Proxmox (KVM) server: My ISP sent me this information(xxx=placeholder): IPs: 2a01:XXX:XXX:301:: /64 Gateway: 2a01:XXX:XXX:300::1 /59 This is the interface ...
1
vote
1answer
2k views

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. ...
-1
votes
0answers
36 views

Different virtualization technologies without VT-d (IMMOU)

I need access from a vm for a special ISDN pci adapter. Did anybody made PCI cards work with KVM/Virtualbox with hardware which does NOT support vt-d? As of my research shows: 1, KVM In order to ...
1
vote
1answer
46 views

KVM: How to update amount of cores/procs during runtime

The title says it all. How do I increase the amount of cores/cpus of a vm without requiring a reboot. Strangely I did not find any documentation of how to do this...
0
votes
0answers
42 views

CentOS Host KVM Virtual Machine running a Windows VM - No internet access

I've installed a KVM virtual machine on a CentOS host using libvirt. I've also set up a bridged connection from the interface en0:4 running on IP x.x.x.15 to br0. (The IP is a public one). Running ...
-1
votes
1answer
21 views

Connecting to KVM VM via VNC [closed]

I just installed KVM on centos 6.5 and after I created a VM I don't know how to access via VNC. I used this command to create the VM: virt-install --name=guest_name --arch=x86_64 --vcpus=2 ...
1
vote
0answers
104 views

Ubuntu 14.04 KVM Host - Only network device pcnet working

I've installed a KVM host on Ubuntu 14.04. I've added a networking bridge as br0 and also added the p4p1 network adapter to it. My problem is now that only the "pcnet" networking guest driver is ...
8
votes
8answers
10k views

How do you synchronise huge sparse files (VM disk images) between machines?

Is there a command, such as rsync, which can synchronise huge, sparse, files from one linux server to another? It is very important that the destination file remains sparse. It may be longer (but ...
2
votes
2answers
2k views

Centos KVM Host OS not passing all network traffic Guest OS

I'm running KVM on Centos 5. I have a guest OS, ubuntu 10.04, that has Snort 2.9 installed on it. The guest OS has (2) nic's, eth0 and eth1. One nic, eth0, is configured with an IP and can be ...
1
vote
0answers
29 views

CloudStack virtual machines slow down over the course of a day

I run CloudStack 4.3 using KVM on an Intel(R) Xeon(R) CPU E5-2620 on Ubuntu 14.04 LTS. When I first start a virtual machine it runs quickly. Over the course of the day it slows down to acceptable. ...
0
votes
1answer
1k views

apt-get update can not connect

i run a dedicated ubuntu 10.04 server. i use kvm/libvirt/virsh to run a virtual machine that's also ubuntu 10.04. i bridged the network (1 of 2 IPs is routed via NAT to the LAN, where my VM ...
0
votes
1answer
54 views

What is the safest way to convert a Windows Server 2012 Hyper-v system to Linux with KVM?

I have one server running several different virtual machines with Hyper-v for different clients. All of my clients have given the OK to a maintenance window over one day on a weekend in the future. I ...
0
votes
2answers
23 views

unable to connect from other hosts to vm client

I'm building a vm client from a host using the virtual network 'default': NAT setting in virt-manager kvm which makes a bridge (virbr0) using my host's nic. The vm client receives the default ip of ...