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)

0
votes
1answer
214 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
266 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
78 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
83 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
207 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
87 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
38 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
35 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
42 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
43 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
40 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
260 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
46 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
33 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
65 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
20 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
77 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
26 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
137 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
44 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
63 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
116 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
197 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
46 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
37 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
34 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
26 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
55 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
60 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
196 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
155 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
48 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
45 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
143 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,...
1
vote
1answer
60 views

Use Lvm snapshot for a new (KVM) virtual machine

I need to migrate one CentOS5 (32bit) physical server to in a virtual machine. My idea is to take a snapshot of the LV and then import in kvm creating a new vm. Is this a good idea? More precisely, I ...
2
votes
1answer
88 views

Handling /etc/fstab when upgrading linode from Xen to KVM

I have a linode that is currently on one of Linode's Xen servers. I see that I am eligible to upgrade to a KVM linode. One thing that concerns me is that Linode's upgrade guide says block devices ...
2
votes
2answers
497 views

KVM top shows high CPU load on host for windows7 guest though windows is on idle

we have an virtualization environment with actually 4 VMs (2 x linux, 1 x w2k3, 1 x win7). In the host system (Debian Jessie) top always shows a CPU load of 30-70% (or more) for the qemu process of ...
0
votes
2answers
52 views

Can the server administrator browse date of the hosting based KVM Virtualization?

The hosting in https://www.digitalocean.com/ is based KVM Virtualization. If I purchase a their hosting , and upload private data, can the server administrator browse all my of date?
1
vote
0answers
185 views

Proxmox/KVM: Can not clone VM

I would like to create a clone of a KVM machine - yesterday I was able to create a clone of the same machine within some minutes. Now it takes hours and is still stuck an "0%": create full clone of ...
0
votes
1answer
145 views

IPv6 routing under KVM virtualization

I'm having trouble configuring IPv6 routing under KVM virtualization, and I need your help! On the host machine. It uses bridge (named br0) to give its guest machines Internet access. On the guest ...
0
votes
1answer
29 views

Files left over after removing KVM guest

Looking at this post I ran the following commands to remove a VM: sudo rm /var/lib/libvirt/images/centos01.qcow2 sudo virsh undefine centos01 --managed-save --snapshots-metadata But it looks like I ...
5
votes
1answer
1k views

WARNING KVM acceleration not available, using 'qemu'

Running debian (Linux Rick 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt11-1+deb8u6 (2015-11-09) x86_64 GNU/Linux) Looking at my cpuinfo I can see I have vmx support: flags: fpu vme de pse tsc msr pae mce ...
1
vote
1answer
132 views

Can't ping from guest CentOS 7 VM to another guest CentOS 7 VM

I have a problem with ping VM from and to another VM that run CentOS7. The hypervisor is KVM and I control all with CloudStack. The strange thing is that I can ping from and to secondary storage vm ...
0
votes
1answer
32 views

QEMU/KVM nic properties

1) What's the use of the addr value when specifying a new network interface on QEMU/KVM ? Example: qemu -hda deb.img -net nic,addr=192.168.1.10 2) Is there a way to specify directly the IP address ...