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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34 views

KVM host won't use memory for caching

I have a KVM host (Linux 3.14.32) running 8 virtual machines. They are overprovisioned (memory allocated for them is greater than available physical memory on the host). However they consume only ...
3
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0answers
49 views

Add a second bridge to a virtual machine

We have a ubuntu-12.04 host running another ubuntu-12.04 virtual machine with kvm virtualization and bridged network interface on eth4. This network allows the virtual machine access to the outside ...
2
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106 views

Virtualization limits for Ubuntu Server 14.04 LTS with KVM?

Essentially I'm after something like this: Virtualization limits for Red Hat Enterprise Linux with KVM but for Ubuntu Server 14.04 LTS. I'm trying to create some KVM guests with very large 1TB+ RAM ...
2
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81 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 ...
2
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0answers
262 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 ...
2
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123 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
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0answers
79 views

Change sender-IP for VM in libvirt behind NAT

I have a server with my own public /28 IPv4 Network. On this server I have some vServers, done with KVM/libvirt. These vServers are connected with a virtual network, NATed to the internet. Every ...
2
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84 views

How to relate cloudstack volume ID to guest virtual block device ID?

Under CloudStack 4.2.1, I have an Ubuntu 14.04 guest with 3 attached volumes of the same size. From the CloudStack management page, I can see that each attached volume has a name and an ID (and a ...
2
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108 views

__ticket_spinlock high cpu

We are having a strange problem on our Ubuntu 10.04 KVM infrastructure, where periodically, one of two vm webservers freaks out, with persistently high load, even if we restart the applications. (the ...
2
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916 views

Please help recovering lost volume group

After a reboot, the volume group on my server completely disappeared. [root@dal01 log]# vgdisplay No volume groups found [root@dal01 /]# lvdisplay No volume groups found [root@dal01 ~]# pvdisplay ...
2
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4k views

VNC faster than Spice for remote access to KVM guest?

Having used RDP before, I'm not exactly thrilled with the performance I am seeing from VNC to my KVM virtual machines. The KVM host is Ubuntu 12.04 server x64. I've read that Spice is faster, and ...
2
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777 views

virtualbox to qemu but results in no bootable device qemu

I use vagrant to create my development vm. I exported the vmdk to vdi, and then convert the vdi to img. cd virtualbox_dir/test_vm VBoxManage clonehd test_vm.vmdk raw.vdi 0% ..... 100% qemu-img ...
2
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0answers
596 views

preseed command string fail with newline character using virt-install initrd-inject

I am creating a new virtual machine using libvirt's virt-install command. The command pulls a local preseed file from the hypervisor using initrd-inject: virt-install \ --autostart \ --name vm1 \ ...
2
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0answers
238 views

KVM on Ubuntu: Port forwarding to a guest VM

I installed kvm and set several guests on a server using vmbuilder. Here is the following configuration : server host1 (xxx.xxx.xxx.xxx) -> guest vm1 (192.168.0.3) ...
2
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402 views

KVM host kernel configuration for best performance

I'm currently building a kernel for my server, which should serve for hosting virtual machines using KVM. There are a few kernel configuration options that are already described in the KVM-Wiki. The ...
2
votes
0answers
321 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 ...
2
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769 views

KVM Guests & IPv6, Connectivity breaks after some time

Goal: Assign public available IPv6 adress to every guest Problem: Working IPv6 connectivity suddenly stops working. After starting everything up (network on host, guests) everything works fine. i can ...
2
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0answers
364 views

How to configure opennebula for allowing a cluster private network to host images with public IPs

I am installing open nebula 3.4.1 for running virtual machines a (kvm based) cluster made of 5 computers: a front-end machine having 2 network interfaces and 4 slaves machines with a single network ...
2
votes
0answers
119 views

Windows 2k3 server as a KVM client

Just wondering if anyone else has had issues installing Windows 2K3 server under KVM. I have tried a few times tonight and keep getting "not a supported platform" when the installation first boots. ...
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30 views

KVM - graphic passthrough

My PC have two PCIs and installed CentOS 7. I followed this Document about PCI Passthrough I added iommu and enabled BIOS VT-D grep iommu /boot/grub2/grub.cfg linux16 ...
1
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0answers
43 views

XFS/EXT4: Why is actual file size on disk larger than apparent size? Clarification

On a CentOS 7.1.1503 (3.10.0-229.el7.x86_64) system running KVM/qemu on an XFS filesystem, I'm attempting to work out what specifically is adding additional space to a VM diskimage file. $ ls -ls ...
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0answers
21 views

Set custom cpu string for qemu/kvm

I have some virtual machines with software, which licensing check depends on cpu string. They're running on kvm - with default cpu string value - which is QEMU Virtual CPU version 1.7.1 After ...
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0answers
19 views

Unable create/access storage pool in a KVM

I have trouble using storage pools in my KVM setup. I get the following error message whenever I try to use a pool-* command in my virsh shell. virsh # pool-list error: Failed to get the number of ...
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0answers
77 views

kvm guest routing with 2 default gateways

I have a kvm guest with two virtual NIC. NIC with internal IP III.III.III.III (eth0) NIC with external IP EEE.EEE.EEE.EEE(eth1) I'm using macvtap. The host has his own external IP. I can ping ...
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60 views

KVM NIC passthrough “device already in use”

I have a server with 2 NICs 01:00.0 Ethernet controller: Intel Corporation Ethernet Controller 10-Gigabit X540-AT2 (rev 01) 01:00.1 Ethernet controller: Intel Corporation Ethernet Controller ...
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83 views

Why are Windows XP and 7 qemu/kvm guests not recognizing updates to a local Samba share?

I develop cross-platform software and test the Windows ports with wine, Windows XP, and Windows 7, the latter two tested using qemu with KVM. I also have several versions of OS X and Debian Wheezy as ...
1
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0answers
10 views

Start a script on ganeti node after instance is started or migrated

There is a ganeti cluster. Is there any way to run script on ganeti node after some instance is start running on that node? In both situations - starting from scratch, and migrating live from another ...
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0answers
68 views

Can't connect to Windows Server 2012 Virtual Machine in Red Hat 6

I have installed a WS2012R2 virtual machine using KVM on Red Hat, It has a bridge connection, Both (Host and Guest) have public IP addresses, both have internet access, both can ping any ip address or ...
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0answers
32 views

Routing private IPv4 addresses internally

I have the following set-up involving two KVM hosts and numerous virtual machine guests on each. The guests communicate to each other on both hosts via [192.168.216.0/24]. [192.168.216.42] is ...
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0answers
130 views

Access to equally defined VM in different VLANs

I have a working libvirt cluster and in order to perform some paralellization I have duplicated it. At the moment my scenario looks like this: two clusters whose VM definitions are exactly the same, ...
1
vote
0answers
153 views

Can't get a PowerKVM guest's network to work

I've been stuck by this issue for a couple of days. I am running a Ubuntu 14.04 guest on top of a PowerKVM host (PowerKVM is KVM on IBM's Power Systems, so basically it's just KVM.). I can't get the ...
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110 views

Debian KVM Host, Debian guests : where full-disk encryption should be done?

I have a host under Debian Wheezy, running qemu/KVM. I want to have all my guests fully-encrypted. I can see to possibilities : - Either I encrypt the LVM Volume using dm-crypt (cryptsetup) and use ...
1
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0answers
165 views

When i use virt-install --import, virsh vol-list --pool default return null

I upload my guaji.img file to server, and use following code: sudo virt-install -n guaji -r 512 --os-type=windows --os-variant=winxp --disk #{to_rmt},device=disk,bus=virtio --noautoconsole --import ...
1
vote
0answers
797 views

How Open-VSwitch bridge assigns IP addresses to guest when used on KVM hypervisor?

I have setup ovs switch on ubuntu and configured network xml and guest VM xml files respectively(Set-up for KVM hypervisor). Created new network for openVswitch by creating and defining new vlans.xml ...
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0answers
117 views

Why privacy ipv6 address cannot connect the internet in guest vm

I have a guest ubuntu 14.04 installed in kvm, host is a fedora 20. The eth1 nic of guest is in macvtap bridge mode. Ubuntu default enables ipv6 privacy extension, and prefers the temporary address: $ ...
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0answers
106 views

KVM: VNC connection blocked

I'm running a KVM host with three client vms. Two ubuntu servers and one windows server r2 2008. All three VMs have the VNC option enabled in their XML config file: <graphics type='vnc' ...
1
vote
0answers
117 views

Infiniband + KVM

this question is a copy from stackoverflow, as I was told, my question would fit here better. Despite quite a long search for days, I could not find any good information about the following - though ...
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0answers
220 views

libvirt / kvm guests take very long time to start after host reboot

Host system is CentOS 6.5 x86_64. I have setup an Ubuntu guest by following this wiki. The guest works, but: if I reboot the host, it takes a very long time (about 30 minutes on the last reboot) ...
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0answers
195 views

Enable SDL for KVM under CentOS 7

I'm trying to set up a VM in CentOS 7 with an SDL display, but every time I try to run it, I get the following error: Error starting domain: internal error: process exited while connecting to ...
1
vote
0answers
331 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 ...
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0answers
62 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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992 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
101 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. ...
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vote
0answers
221 views

Selenium in virtual machine is slower than desktop

I've set up a kvm virtual machine, CentOS 6 on both guest and host. I'm using selenium on the guest in order to test a web site. However, it loads significantly slower than trying to hit the web site ...
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286 views

Slower VM Performance for Headless Browser Tests on Xeon

I created a virtual machine on my desktop to run our continuous integration process. After I was happy with it, I moved the VM (keeping the same configuration) onto our server where I found that the ...
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0answers
192 views

virsh vcpu_period and vcpu_quota

I have been looking into ways to divide my CPU amongst KVM guests other than by just setting vCPU access limits. I understand the concept of cpu_shares which can be set/displayed with virsh schedinfo, ...
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0answers
189 views

How does virt-install create and persist and secure the boot disk?

Normally when i run virt install, I boot initially from the network, by installing from source, and also including a "--disk" option. The way i do it is described here ( in the "root" of this ...
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0answers
318 views

SSD+MDRAID+LVM+KVM results in lower performance than expected

We use kvm for virtualization, the disk images are stored as logical volumes. The logical volumes are stored on a bunch of software-RAID1 (mdadm) arrays composed of Intel DCS3500 SSDs (each array is a ...
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0answers
81 views

Bridging Adapter in Ubuntu 12.04 LTS for KVM

Fresh install of Ubuntu 12.04 LTS with libvert/KVM installed. I have 2 virtual machines that I need need to be on the same LAN as the host. The host has two physical interfaces eth0 and eth1. eth1 is ...
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0answers
1k views

KVM guest cannot write to 9p share owned by non-root

I am aiming to set up full write access to a 9p share for a KVM guest. Both host and guest have the same users/groups with the same IDs. Both host and guest should be able to write to the share using ...