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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low write disk speed of windows kvm guest with LVM

I have a trouble with my windows 2008 R2 KVM guest. It write speed to disk extremely slow: But on another VM (windows 10) on this KVM host write speed is ok: # cat /etc/system-release CentOS Linux ...
2
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1answer
704 views

Get link speed of an virtio-net network adapter

I have an linux vm running on kvm with virtio-net, and I want to check the link speed. How can I do that? What I tried so far: # ethtool eth0 Settings for eth0: Link detected: yes It seems that ...
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1answer
116 views

How to explain the machine type concept in the virtualization?

When I was under Debian Wheezy, virt-manager created virtual machines with the "pc-0.12" machine type. Since I am under Debian Jessie, virt-manager creates virtual machines with "pc-i440fx-2.1" ...
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2answers
54 views

What does take all the cpu here?

On a small SSD VPS I got 2 GB of RAM and 2 vCPU core (dedicated to my server), virtualized via KVM. So far so good. The server is mainly used for databases (MySQL) and fast network file storage (via ...
2
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0answers
111 views

how to enable L3 cache on kvm guest?

I start a kvm guest(centos6.5) on a Intel machine(centos6.5),use libvirt, the guest's xml as follow <domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'> ...
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29 views

How to definitively change a parameter in a xml vm domain file?

I have a vm with the machine type = "pc-012". For a reason linked with virtio, I changed the machine type for "pc-1.1" with virsh edit domain command. When I reboot the host, I find again "pc-012" !? ...
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2answers
47 views

Running two Ubuntu KVM virtual machines with bridged (tapped?) networking

I have a server that's running Ubuntu 14.04, and I'm trying to run two virtual machines with bridged networking at the same time. The networking of the first VM works, but the second one has no ...
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1answer
47 views

VM inbound traffic only works with outbound traffic at same time

I've recently configured a VM on a low-end rental VPS service to try to improve load times for a web site I'm running. (The web site makes use of high-reliability technologies that require full access ...
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0answers
84 views

DMAR errors on KVM PCI passthrough, server freezes

I'm using Proxmox VE 3.4.9 in a 7 nodes cluster, and I'm having some stability problems on the 4th node. Sometimes I have a very lot of error like these: Nov 17 09:48:30 node4 kernel: DMAR:[fault ...
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1answer
47 views

KVM port binding

I followed this tutorial to install a KVM virtual machine on my ubuntu server. Now i need to bind a port from the guest to the host. I tried several tutorial to bind the port, but nothing worked. My ...
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1answer
48 views

Golden image updates in qemu

Consider that there are 100 windows virtual machines coming from a single base image and each vm is added to domain along with minor other machine specific settings which can be done by a script. ...
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2answers
34 views

Debian KVM network setup

I have a server with 4 ethernet ports. I want to use two ports for link aggregation to be used for KVM (virtual guests). How can I go about setting this up properly? Create the link agg first then ...
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1answer
32 views

DHCP Server Offers, But Client Doesn't Accept

I currently have a development node that runs KVM virtualized VMs. There is a DHCP server running on the node to provide addresses to the VMs. I had DHCP working previously, but I reinstalled one of ...
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1answer
19 views

Using byobu on KVM Guest via Serial Console

I am logged in to a KVM Guest (running Ubuntu 12.04 on Centos 6.6 host). I followed the instructions here Access pty login prompt in VM The problem is that the console fills the terminal window just ...
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1answer
492 views

CentOS, KVM, VLANs and bridging

I need help designing networking for virtualized guests using KVM. My machine is running CentOS 7 and has 2 NICs. I'd like to achieve the following One physical interface (em1) shall be used for ...
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0answers
25 views

Remove Hardware Support From Qemu [closed]

I am currently experimenting with Qemu 2.4.1 and I'd like the support for few hardware to be removed. Say like USB/Mouse/SoundCard etc. While I was tinkering with the source code, I was able to ...
2
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1answer
82 views

Virtualized X Server on Host Machine

So, I'm trying to tackle a rather odd issue. I'm fairly new with virtualization (the most I've managed is isolating some applications with Docker and VirtualBox, which isn't hard to do). I am more ...
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1answer
42 views

KVM/libvirt: Guest monopolizes bridge

I'm having a problem in which the first guest started on a VM host can send traffic through both of its assigned interfaces, but subsequent guests can only send traffic through one interface. My VM ...
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0answers
154 views

Using KVM with macvtap and VLANs for VM

I want to use the optimizations given for the ASAv (Page 18) which should run with KVM. I am using Ubuntu 14.04 LTS and I should configure macvtap for an higher performance. It just says the ...
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2answers
34 views

kvm raw disk cloning

I have a kvm guest machine on raw disk that I would like to clone so that I could restore it to another kvm host machine on lvm with drbd. I need to do this without any or as little downtime as ...
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0answers
81 views

How to switch in ws2012 from an IDE disk to a Virtio disk?

I am running Windows server 2012 in a virtual machine under Debian Jessie. I tried to follow the Red Hat tutorial in order to switch on the Virtio drivers: 1) I downloaded from Debian the virtio ...
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1answer
62 views

How to tell if VM in KVM is using VT-x

I have a machine running under KVM which is not performing very well. I have been trying to google a way to determine if a VM is using VT-x. I can find plenty of links on how to determine if your ...
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1answer
31 views

Failed to read VM '[Empty Name]' OVF, it may be corrupted

When importing a VM from virt-p2v into rhev/ovirt, I am greeted with a Failed to read VM '[Empty Name]' OVF, it may be corrupted when I visit the VM import tab. The engine.log gives this unhelpful ...
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1answer
687 views

Proxmox KVM fails to start

My new server is Fujitsu Primergy RX1330 M1 with Intel® Xeon® Processor E3-1220 running either Proxmox V4 or Proxmox V3.4 i have this problem : When i create a new virtual machine, during the start ...
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4answers
350 views

How to “really” reduce the size of KVM VMs images?

I've spent many hours searching the web about how to shrink KVM virtual disk images, especially for Windows guests, with no luck. All I've found is to zeroize the VM free space, defrag the virtual ...
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1answer
28 views

Qemu qmp snaphot-drive

what is the correct method to use qemu qmp snapshot-drive ? Is there any other way to create snapshot of qcow2 based VPS without using virsh snapshot-create ? They seem to corrupt the filesystem on ...
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8answers
2k views

Free hypervisor for small configuration

I'm building a server for virtualization for a non profit organization. I was planning on employing VMware ESXI free but I'm second guessing my plan because newer ESXI don't seem to be well supported ...
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0answers
134 views

IBM WebSphere Application Server ND 7.0 installer on a Debian Jessie AMD64 KVM host stuck on generateProfileKey

I am trying to install IBM WebSphere Application Server Network Deployment version 7.0 on an AMD64 KVM VM running Debian Jessie. I cannot start the launchpad.sh script regardless of whether I use ...
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0answers
74 views

Openfiler as KVM guest does not recognize drives

Team, I am using openfiler as a KVM guest, I have provisioned virtual drives and can see them when I login to the openfiler cli and run fdisk -l. I cannot however configure them from the openfiler ...
2
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2answers
693 views

Solidworks: activation license mode is not supported in this virtual environment (Qemu-KVM)

The question is not around Solidworks actually, so please continue to read. The whole idea of virtualization is to be hardware independent. Before our eyes a whole new dependency level is being ...
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0answers
58 views

Ubuntu 14.04 Dektop libVMI installatoin

In Ubuntu 14.04 I install KVM and successfully created Win 7 guest, Info: Kvm version: QEMU emulator version 2.0.0 (Debian 2.0.0+dfsg-2ubuntu1.19), Copyright (c) 2003- Now I am following this link ...
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2answers
464 views

Backup of KVM raw-images

` Hi,guys! I'm running qemu-img-0.12.1.2-2.355.0.1.el6 on CentOS 6.3 using raw images for my virtual machines. Is there any way to safely backup guests, without stopping them? I've tried to make ...
3
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1answer
81 views

VM-VM only network with KVM

I'm trying to create a VM only network where guests can speak to each other, but not with the host. I want to isolate the host for security reasons, as multiple test users will be using the VMs. ...
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1answer
10 views

How can I set the vnet number for my KVM VM?

I need to ba able to sniff the vnetX interface that is created for a KVM VM when it starts. The problem is, the X in vnetX is automatically incremented from 0 with each VM. I've read somewhere that ...
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votes
2answers
35 views

Why is Windows 7 64 bit not recognising my IDE HDD in KVM?

I'm trying to run Windows 7 64 bit on KVM on Ubuntu 14.04.3 LTS (GNU/Linux 3.16.0-46-generic x86_64). If I install Windows 7 32 bit, the windows installer recognizes the IDE HDD, but the 64 bit ...
2
votes
1answer
332 views

dhcp not assigning gateway

So I am running a dev server for KVM virtual machines. I have a DHCP server running locally on the host node with the following configuration: /etc/dhcp/dhcpd.conf ddns-update-style none; ...
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0answers
21 views

KVM - Reassembly of packets done by virtual bridge interfaces

I've 2 guest OSs in KVM based setup, talking to each other using a virtual bridge(VBR) Client--Device1--(VNET1)----VBR----(VNET2)Device2--- Server I see that the packets are getting fragmented by ...
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1answer
244 views

KVM: how to resize guest VM disk via LVM

on the Debian host nl-ams02c-kvm02 there is CentOS guest VM nl-ams02c-ispbgp02. i resized the corresponding LVM like : root@nl-ams02c-kvm02:~# lvextend -L +10000G /dev/raid50/nl-ams02c-ispbgp02 ...
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0answers
112 views

Use host's VGA output from virtual machine

Is there a way to stop a host OS from using its VGA port (on the motherboard) and allow a VM to use it instead with KVM-QEMU? I have read about VGA pass-through, but all the discussion I've found on ...
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0answers
69 views

enable ssh over virtual machines running on kvm

I am trying to connect to a virtual machine running on KVM hypervisor from a host machine (Ubuntu 14.04) through ssh, but it is giving me the following error: ssh: connect to host 10.117.82.2 port ...
0
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1answer
131 views

KVM hypervisor swap

I've had my first CentOS 7 KVM host setup for about a year now, it is a dual quad-core machine with 32GB of physical memory. I have a dozen VM's running with a total allocated memory of 23GB. This ...
1
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1answer
3k views

network configuration (bridging) proxmox

I bought yesterday an proxmox license. All works fine only the network configuration is very complicated. My network configuration: 84.200.50.186 -> hostsystem ip 84.200.50.186 -> VM ip ...
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0answers
103 views

kvm network bridge on centos 6

I have a Centos 6 KVM host. I installed the KVM following this manual: https://wiki.centos.org/HowTos/KVM Its network has been configured as a bridge: [root@server ~]# ifconfig br0 Link ...
2
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1answer
945 views

Delete “orphan” libvirt snapshot

I am trying to live-snapshot using KVM as per this procedure. I must have messed up at some point because I'm in a state I don't understand. My VM is called prod. It was created in file ...
0
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1answer
77 views

port forwarding with libvirt

I'm trying to get port forwarding working through libvirt on top of QEMU and KVM. I found this article (https://snippets.webaware.com.au/howto/running-qemu-with-port-redirection-through-libvirt/), but ...
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2answers
209 views

How do I connect to my libvirt/qemu/guests ? (with no ip address)

I have inherited the administration of a trusty ubuntu server with several virtual servers, also ubuntu using libvirt and qemu. I have the problem I cannot connect to these virtual servers/guests. ...
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0answers
102 views

How to configure HW, OS, network for virtualization with VMDq and SR-IOV features [closed]

I have: SUN X4100 M2 Intel Ethernet Adapter E1G42ET (VMDq and SR-IOV supported) Linux Ubuntu 14.04 Server (host machine) May setup 15 KVM as hypervisor I want some virtual guest machines (linux) ...
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1answer
63 views

Server abandons set static ip and returns to dhcp given address

I have a few virtualized (ubuntu 14.04 LTS) servers under KVM that I'm trying to move to an ip block other than the one reserved for servers under dhcp (the 10.10.2.0/24 block). I change the ip and ...
1
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1answer
593 views

Best options for KVM/qemu/libvirt VM migrations without shared storage

My team has recently been tasked with improving the virtualization infrastructure at the company and one thing we're looking into doing is speeding up migrations. We use local storage only on all VM ...
2
votes
1answer
2k views

Backup of running KVM qcow2 VPS

I want a robust method of taking backup of KVM VPS of qcow2 file, while running. After searching for a long time I found that we can use rsync for live backup. I used following command for rsync: ...