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, kvm-...

learn more… | top users | synonyms (3)

-1
votes
1answer
26 views

Modifying qemu without screwing up my current install

I currently have kvm installed on my Debian laptop: kvm --version QEMU emulator version 2.1.2 (Debian 1:2.1+dfsg-12+deb8u5a), I want to modify it to supported nested virtualization (ESXi VMs). ...
0
votes
0answers
19 views

kvm host refuses to shutdown when guests are suspended

I've been able to do this before but now all the sudden when I suspend the guests on my Debian kvm host and then shutdown the host it hangs with "a job is running for suspend active libvirt guests" ...
0
votes
1answer
76 views

Proxmox-Server reboots sporadically

I just mentioned that my proxmox-system is rebooting from time to time when performing backup-tasks (bacula, not the proxmox-backup-system). The logs are showing the following: Mar 8 02:30:01 ...
0
votes
0answers
18 views

how to change or modify libvirt xml domain definition?

first of all excuse my bad english. I would like to know if it is possible to modify default xml domain definition location (/etc/libvirt/qemu). I would like to change this default path. tanks your ...
1
vote
1answer
18 views

Creating libvirt “mcast” networks using virt-install?

I would like to create virtual machines with mast network interfaces. This is possible to by first creating a guest using virt-install, then modifying the domain XML. Is there a way to do this from ...
1
vote
1answer
206 views

What are the steps to export a VM from KVM to ESXi?

I want to be able to export a KVM based VM to an ESXi 5.1/5.5 host. My current methods ends up with the VM not being able to boot on the ESXi host. (I have tried importing the same .ova on VirtualBox ...
0
votes
0answers
16 views

How to set up vm delay start when KVM host boot? [duplicate]

I have a KVM host server and running 6 VMs on it. When the server recovers from power failure, all the VMs always autostart at the very same time. I want to autostart one by one, preferably the ...
0
votes
3answers
84 views

Assigning multiple IPs to the same machine with one interface

I have a server with a single physical interface eth0. I intend on running VMs on this server. To that end I have an IPv4 block which is routed to said server. What I'm trying to achieve is to spin-up ...
0
votes
1answer
95 views

Win7 KVM guest with Virtio network driver can't connect to network

I have a ubuntu 15 and KVM. I have an XP guest that appears to basically work. I then set up a Win7 64 bit guest. It would not connect to the LAN. Then I found out about virtio drivers. I ...
2
votes
1answer
93 views

How can I reconfigure a Linux guest in Proxmox to use a virtio-based HDD instead of IDE?

I'm running Proxmox 3.3.1 to host a virtual machine running Linux (64bit, kernel version 3.2.0). The virtual machine uses a 512GB HDD which was unfortunately configured to use the ide driver when ...
0
votes
1answer
238 views

Unable to install Fedora 23 in VM using KVM on Linux Mint 17.2

I'm unable to install Fedora-Live-Workstation-x86_64-23-10.iso into a QEMU virtual machine using virt-manager on Linux Mint 17.2. I've verified that the SHA256 checksum on the ISO is correct. I can ...
2
votes
1answer
360 views

KVM / QEMU: connect to VM without GUI [closed]

Short Version (Solution is below): I have a Windows PC. I have a Debian server (without desktop environment). I have a Ubuntu VM running on Debian server via KVM/QEMU. Question: How can I connect to ...
0
votes
2answers
46 views

How to tell which disk files a KVM guest is using?

I have an Ubuntu guest running under KVM that has several partitions of the same size, each using different virtio RAW disk files on the host. How do I tell which partition on the guest is using ...
1
vote
1answer
86 views

virsh net-define for CoreOS cluster

I have a kvm/qemu/libvirt host with several VMs running happily on br0 with IP addresses that are in the same network as the host they run inside, 192.168.10.0/24. So I'm playing with CoreOS and ...
0
votes
1answer
85 views

Cloning Windows 2012 R2 domain controllers with KVM

Virtual domain controller cloning is a new feature from Windows Server 2012 that I use because it's a very useful and simple way to add additional domain controllers to an Active Directory domain. ...
2
votes
0answers
243 views

tuning tips for CPU load for OpenBSD guest on qemu-kvm Server

I have a CentOS KVM Server running 1 OpenBSD, 1 CentOS and 2 FreeBSD guests. Only the openBSD guest has a higher CPU load on the KVM Server. 8-10% on Server whilst Guest is at idle. The only service ...
1
vote
0answers
105 views

Libvirt & USB Hub Passthrough

I have a virtual machine which I wish to have a USB Hub and all of its devices allocated to a virtual machine. The Hub in question is a USB hub which itself is plugged into one of the ports on the ...
2
votes
1answer
39 views

iptables: add routing for internal guests and port forwarding [closed]

I have the following rules working fine - before I added a private network with a single VM (which can ping all machines on the host but not the outside). I want the VM (192.168.100.2) to reach the ...
0
votes
1answer
37 views

Creating a new domain in libvirt from a base domain

TL;DR at bottom I am building a web interface for libvirt as a project. I am using libvirt-php as the language binding to libvirt and everything is working, except for domain creation, sort of. The ...
0
votes
0answers
52 views

KVM is there a way to map physical memory to host. Like Xen mapping to Dom0

Been looking for an answer to this for a while. I am switching over from Xen virtualisation to KVM, and have been reading about KVM's ability to overcommit memory. I was wondering if anyone can help ...
0
votes
0answers
48 views

Turn off output/force DPMS on unloaded GPU without driver

I'm running a KVM VGA Passthrough VM on my desktop, passing it my dedicated GPU. This VM does not automatically start as I don't always need it. When the VM isn't running, my desktop doesn't touch the ...
0
votes
1answer
43 views

same libvirt config, one machine boots, the other does not

I am migrating a bunch of vms from an old machine to a new one. The old one was using some in-house scripts and lvm logical volumes, the new one uses libvirt and plain files. The configs are rather ...
1
vote
2answers
293 views

Installing VirtIO SCSI on Windows Guest fails

I'm running Windows 10 as guest via KVM / qemu. Unfortunately, Windows doesn't recognize the fedora virtio drivers I want to install for better HDD perfomance. The driver itself does show up, but ...
0
votes
0answers
49 views

NATted host cannot talk to itself unless virbr0 is in promiscuous mode

We have the following situation: A hypervisor using KVM-Qemu/libvirt with a single VM. The VM has the internal IP 192.168.122.151 on the default network pool using virbr0 on the hypervisor. We've ...
0
votes
0answers
34 views

Migrate Virtual Machine from KVM to Xen

I'm trying to migrate a Virtual Machine from Qemu KVM to Xen Hypervisor 4.1, but have problems with it. What is the best and simplest way to do it? What I've done so far: I have installed xen-linux-...
20
votes
2answers
3k views

Very strange file size (more than 600 PB) on a small filesystem

I had a file on an XFS filesystem which size was about 200 GB. It was a QCOW2 image containing a virtual disk of a KVM-driven virtual machine. Something went wrong (maybe it was some glitch of qemu-...
0
votes
1answer
72 views

How to create virtual networks by using libvirt?

I have installed qemu/kvm and have tried to create some virtual machines and network them together. What I would like to achieve is 2-3 virtual machines in their own private network (e.g. 10.0.0.0/24)...
0
votes
0answers
25 views

Do I need acpid daemon in virtualization guest?

I get VPS with KVM virtualisation (server for hosting services). I remove most of desktop services (like dbus, consolekit, xorg) because of security and stability concern. Guest run on virtualised ...
0
votes
0answers
19 views

Add new subnets to KVM Host

I need to assign a handful of /27 subnets to my KVM host node (Centos 6). I routed them correctly at the Cisco switch, so that's all go. Traceroute & ping works fine on gateway on each subnet, ...
1
vote
0answers
31 views

How to do remote calls from server A to B to create virtual machines

This is my first question on serverfault so I hope I'm doing this right as I'm usually on Stackoverflow :-) I have two Ubuntu 14.04 LTS servers, server A and B. Server A runs the web server where ...
0
votes
0answers
83 views

Hardware raid, LVM and KVM cache policy

I have a question about right cache policy for KVM using LVM and hardware raid-controller. So from the bottom: 1. We have LSI RAID controller 9260, 512Mb cache and BBU. Later we also will have ...
1
vote
0answers
27 views

Libvirt does not see updated LVM volume

All VMs run off an LVM pool. I resized one of the LVM volumes to increase VMs drive copacity. Resized it with lvextend as usual. Everything is successful and lvs shows the new size. Libvirt does not ...
1
vote
0answers
161 views

Java application is slow in virtual server (KVM)

I have a Java web application, which runs from JAR, starts embedded Tomcat and is using Spring Boot. Problem is that it runs very slow when running in KVM virtual guest. The same application in the ...
1
vote
0answers
49 views

How does Qemu handle memory?

I'm having a real hard time understanding something and I was wondering if anybody has any experience with this and is able to help. I have two KVM VMHosts, one running qemu 2.4.1 and the other ...
0
votes
0answers
64 views

How to completely migrate Windows Server VMs with no access to hypervisor?

There are two Windows Server VMs (2008R2 & 2012R2) hosted on OVH (via VMware I think). I would like to move away both VMs from OVH to my server running KVM VMs. OVH isn't going to give me any ...
0
votes
1answer
29 views

How do I properly configure KVM

I have a remote dedicated server on which I have installed KVM. When trying to create my first virtual machine I am unable to ssh to the machine. I assumed that I needed another ip address so I ...
0
votes
1answer
135 views

Correct virtio setup on Ubuntu 14.04 64-bit host

At the present moment, my guest is running inside qemu and host is kvm intel, running Ubuntu 14.04, kernel is 4.3.0 stable. From within the guest, when I run "hdparm -i /dev/sdb" on the guest, I get:...
0
votes
0answers
233 views

How slow can be a QCOW2 vm disk (proxmox/KVM) over NFS (dedicated 1Gbit)?

I'm running 3 proxmox 3.4 nodes using NFS shared storage with a dedicated 1GB network switch. root@lnxvt10:~# pveversion pve-manager/3.4-11/6502936f (running kernel: 2.6.32-43-pve) root@lnxvt10:~# ...
2
votes
1answer
51 views

How to create a new domain from an existing base image in virsh

Is there a way of creating a domain with virsh from a base image? I have looked around and found that it is possible using virt-install, however I would prefer it if this was done purely through virsh,...
0
votes
0answers
20 views

Assign a large subnet of IPs to KVM Guest VM

I have KVM host node running a few VMs. I create them using SolusVM panel, however they don't have an option to add bulk IPs in one shot to a guest VM which is silly. I'd like to know how I can add a /...
0
votes
0answers
40 views

how to assign failover ip into windows vm (ubuntu, kvm)

I purchased a dedicate server (Ubuntu 14.04 LTS amd64) with a failover ip from online.net. And i want to setup a windows vm with failover ip using kvm. I tried myself several times, but all failed. ...
0
votes
1answer
35 views

Debian server can't connect to outside world and vice versa

At some point within the past 48 hours my KVM server, which had been running without issue for 6 months, went down completely and was unreachable. Using the control panel to my server, I saw that the ...
1
vote
1answer
30 views

Is a QEMU installation on a raw disk backward compatible?

I create a qemu image like this: qemu-img create -f raw my_disk.raw 2G and (manually) install debian into it: qemu-system-i386 my_disk.raw -enable-kvm -m 1024 -cdrom my_debian_cd.iso Say I do ...
0
votes
0answers
56 views

CentOS 7 machines can't ping each other over ipv6

I got three machines configured for ipv6: CentOS 7 vm1 - 2602:306:cc2d:f591::a/64 CentOS 7 vm2 - 2602:306:cc2d:f591::b/64 Macbook - 2602:306:cc2d:f591::c/64 The two VMS are on the same host (a ...
0
votes
0answers
68 views

Linux / Proxmox KVM machine boots unreliable after migrating to other server

I have a KVM VM running on a Proxmox 2.3 server. The Guest OS inside the KVM machine is an Ubuntu 12.04 LTS 64 bit. I took a consistent backup of the VM (Proxmox VE backup function) and restored the ...
0
votes
0answers
220 views

FreeBSD 10 guest on qemu/kvm CentOS 7 host

I'm trying to install FreeBSD 10 on CentOS host without using graphics (using only serial console). I've tried: # virt-install -n freebsd-a -r 512 --vcpus=1 --os-variant=freebsd10.0 --graphics none -...
0
votes
0answers
171 views

Routing host traffic through Linux KVM (pfSense) router

I have a pfSense virtual machine running on a CentOS 7 host. The host has 2 network adapters, enp1s0 and enp3s0. enp3s0 is connected to a bridge br1. My pfSense virtual machine is also connected to ...
0
votes
1answer
49 views

Linux server, setting up VM with different IP

I just purchased a dedi server (Ubuntu 14.04 LTS) & additional IP's (called Failover IP's) from OVH. I want to setup a KVM virtual machine in order to for them to have their own independent IPs. ...
0
votes
0answers
48 views

ping from internal to external side of gateway doesn't work until one ping from gateway to internal-client

I managed to create isolated network in KVM-QEMU virtual environment. There is a gateway-pc virtual machine which should connect between isolated network and my LAN with dnsmasq installed on this ...
1
vote
0answers
148 views

KVM bad IO sync performance in Linux guest

I'm setting up virtualized Ubuntu 15.10 guest inside Ubuntu 15.04 server using libvirt and KVM. Storage in host system: # mount | grep ext4 /dev/sda1 on / type ext4 (rw,relatime,errors=remount-ro,...