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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Guest networking not working on Debian Jessie Host server KVM with br0 bridged network

GUESTS networking not working at all. In other words guest can not ping host or lan gateway. I have br0 bridge already created, also brctl show that vnet0 was properly added by KVM to br0 on guest ...
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1answer
896 views

Kernel panic installing CentOS7 guest on CentOS7 host

I'm trying to install a CentOS 7 guest as a guest on CentOS 7 KVM host but keep getting a Kernel panic, and it seems to happen at the exact same spot every time. I've even tried installing a CentOS 6 ...
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0answers
79 views

KVM virtual IP address not working on HOST, works on GUEST

I have a setup composed of the following: -> A HOST running KVM with the following network configs: # The loopback network interface auto lo iface lo inet loopback # The primary network interface ...
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0answers
218 views

Proxmox OpenVZ and KVM talking on one host private IP's

I have a proxmox server running version 3.2-132, here's the relevant version information: root@sol:~# pveversion -v proxmox-ve-2.6.32: 3.2-132 (running kernel: 2.6.32-31-pve) pve-manager: 3.2-4 ...
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1answer
488 views

KVM Windows 7 graphics performance using remote desktop

I'm have a Windows 7 installed as a KVM guest on Ubuntu Server 14.04 (headless server). Virtio driver is installed (for system disk). Graphics performance is bad due to lack of graphics driver - there ...
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3answers
2k views

nested virtualization in kvm

I am looking for some advice on configuring KVM on Red Hat 6.5 so that it is able to run Red Hat Hypervisor as a virtual guest. When I am running Red Hat Virtialization Hypervisor as KVM guest then ...
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1answer
278 views

Restarting the networking on the HOST makes GUEST lose connection

I am probably missing something but have a KVM virtualized HOST/GUEST setup. The GUEST is using a bridge (br0) on the HOST for internet connectivity. When I make a "/etc/init.d/networking stop ; ...
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0answers
34 views

KVM Image consumes more space on disk than what du shows

I have a kvm image which by looking at it with du -sh consumes 13GB (12980888) but in reality it consumes 42GB. Found that out the hard way when I scped it and after 18GB it was still copying ...
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0answers
116 views

Find cause of unresponsive Ubuntu 14.04 KVM host

I'm hoping someone can point me in the right direction on a very puzzling problem. I've got an older server running Ubuntu 14.04 that serves as a virtual host for some small virtual (KVM) machines. ...
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0answers
256 views

KVM - Graphics card passthrough

I am trying to passthrough a graphics card to a KVM guest but have been unsuccessful. The graphics cards has been attached and it does appear that the guest is aware of the card, I can see the kernel ...
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1answer
8k views

KVM/libvirt: How to configure static guest IP addresses on the virtualisation host

What I'd like to do is to set the guests' network configuration (IP address, subnet, gateway, broadcast address) from the host system. The used network setup is in bridge mode. How can I configure the ...
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2answers
171 views

Cut'n'paste between X11 Desktop and the virt-manager VNC graphical console of a Win7 VM guest on a Server

I have a licensed copy of MicroSoft Windows 7 professional installed and running as guest on my Linux server running qemu-kvm. This works just fine. But I was unable to figure out how to ...
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0answers
72 views

“Nosy Neighbor” and the CFQ scheduler

I'm trying to understand how does using CFQ affects the "Nosy Neighbor" problem. I'll ask it a bit naively, can a "Nosy Neighbor" even exist when using CFQ? Isn't that CFQ should make sure all ...
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0answers
63 views

openvpn peers can ping network but not reverse

In a nutshell, I have two libvirt/kvm hosts on which I have virtual machines running. The hosting company that these machines are with cannot provide any sort of virtual network between these ...
1
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1answer
323 views

KVM Bridge with external ip with windows server 2012 guest

I'm currently setting up a guest windows server with kvm/qemu on a unbuntu 14.04 host and a bridged network connection to allow the server to be exposed over the internet. I'm trying to give my ...
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0answers
277 views

Libvirt/KVM vm - No network connectivity

I have installed devstack (OpenStacks development platform) on a physical ubuntu 14.04 host and I have been trying to follow the tutorials for manually creating an image. I have tried for Ubuntu and ...
1
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0answers
317 views

Weird Phusion+nginx spawning delay error

We are trying to migrate an application written on REE from cloud provider A to cloud provider B. The application code, VM specs and operating systems are the same. The basic difference is that cloud ...
2
votes
2answers
2k 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 ...
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1answer
395 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 ...
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2answers
1k 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 ...
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2answers
796 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 ...
1
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2answers
65 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 ...
2
votes
2answers
698 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 ...
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1answer
2k 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, ...
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votes
1answer
3k 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 ...
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2answers
141 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
292 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 ...
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0answers
56 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.
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1answer
311 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 ...
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votes
3answers
56 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 ...
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votes
1answer
112 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 ...
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3answers
160 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 ...
2
votes
0answers
225 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 ...
1
vote
1answer
248 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...
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0answers
236 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 ...
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votes
1answer
175 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
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0answers
959 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 ...
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0answers
95 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
253 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 ...
0
votes
1answer
350 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
93 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 ...
0
votes
2answers
727 views

How can I make Windows Server 2012 running on KVM boot with virtio rather than IDE?

I have Windows Server 2012 Essentials running on KVM in Ubuntu 14.04. I've had some problems detailed here Windows Server 2012 on KVM on Ubuntu 14.04. Runs well for a while and then slows down I ...
0
votes
0answers
104 views

IP failover on Proxmox

I have a dedicated server with OVH and I have ordered IP failover. Now I'm wondering how to add them to my Proxmox installation, I tried to add a network interface with a new ip but it didn't work. ...
2
votes
1answer
1k views

Linux bridging for KVM

I have a Debian Wheezy machine on which I tried to setup KVM with bridged networking. Unfortunately, the bridge does not appear to forward traffic correctly. My setup is the following: The physical ...
2
votes
0answers
109 views

Exchange 2010 on KVM - CPU usage reporting incorrectly

Good Morning, I have virtualized an exchange server using KVM (proxmox actually). It is Exchange 2010 SP3 running on server 2012 R2. KVM version 1.7.1. I am using the latest (0.1-74) virtio ...
2
votes
1answer
247 views

Debian Wheezy in KVM: can't set IO scheduler

I'm running a Wheezy box in KVM, by default it runs the kernel 3.2. After I upgrade to 3.14 from backports, I no longer can tune the IO scheduler. Before: # cat /sys/block/vda/queue/scheduler noop ...
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votes
0answers
2k views

Gnome Boxes on CentOS 7 with Windows 7 as a guest

I just installed CentOS 7 and tried to use Gnome Boxes to create some virtual machines. As long as I stick to other Linux distributions everything is fine. But I really do have trouble installing ...
3
votes
2answers
195 views

same subnet,different VLAN in Virtual machine

I have 2 VLAN,VLAN 100 and 101 but only one subnet i am trying to make this work with virtual machine so that VM will have two IP address in same subnet but will actually be in two VLAN. steps ...
1
vote
1answer
168 views

KVM virtualization with two bridges, want routing to use each bridge as mapped in KVM

I can't seem to find an existing question like my scenario. I'm using 2 public bridges for 4 VMs. Two VMs per bridge device. Interface stats show there is use of the assigned bridge for the VM on ...
2
votes
2answers
1k views

Why has CD/DVD host passthrough been disabled in CentOS 7 \ RHEL 7?

I'm learning to use the KVM on CentOS 7 right now. For some reason Red Hat decided to disable the possibility of installing an OS on a virtual machine from a CD\DVD-Rom in RHEL 7. When creating a new ...