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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unable to open KVM when trying to VNC

I am trying to open a KVM session after connecting to the remote host through VNC Scenario: Server: 192.184.148.52 having a VNC server running at 192.184.148.52:2 with XYZ username and has a KVM ...
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774 views

Linux - KVM - very slow disk io

The I/O performance of my new server is pretty low. I Googled and tried everything I can imagine. First of all, here are the Hardware Components: AMD Opteron(tm) Processor 6344 4x Seagate ...
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360 views

KVM : VMs need several restarts to boot (on 2 different hosts)

I'm using a KVM hypervisor on a Ubuntu Server 12.04 server. My virtual machine's virtual disks are LVM volumes, formatted as ext3. The guest OSes are all Ubuntu 12.04 and 14.04 server. Everything ...
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236 views

Online resizing of kvm guest root filesystem?

I have a Linux guest that uses an LVM volume directly as root file system (that is, there is no partition table). libvirt config looks thus: <os> <type arch='x86_64' ...
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82 views

How to start a new instance of QEMU based on the same image and snapshot?

I have a QEMU image (qcow2) with a snapshot stored in it. Right now I'm using libvirt to start it. However, I want to be able to run more than one instance of the same image+snapshot. I guess I can ...
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952 views

dnsmasq(as DHCP server) isn't working in KVM+libvirt envirmont

I'm using dnsmasq as DHCP server in VM environment. But It didn't working. I disabled basic DHCP feature in libvirt. <network> <name>default</name> ...
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243 views

check a vps guest memory usage and CPU usage

I have vps guests that are managed by KVM and libvirt. Using virt-df, I am able to check the real disk usage of each vps guest. #virt-df [--options] -d domname Is there a similar utility tool to ...
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308 views

Ping (DUP) with Linux bridges and tap devices

http://imgur.com/qPoy2QJ I have two Linux (Ubuntu 12.04) VM (running on KVM) that networked together using two Linux bridges as shown above. The network interfaces are Linux TAP devices. The problem ...
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46 views

DHCP error when creating a kvm ubuntu image

I'm trying to create a new ubuntu image in kvm using Virtual Machine Manager. I select "CDROM" ad the installation media and insert an Ubuntu CD into the drive. When I hit "Create" the newly created ...
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368 views

Tap interface within a virtual machine has NO-CARRIER

I am trying to hook up a virtual machine to a host using openvpn. When i create a tap interface within the virtual machine using: /usr/sbin/openvpn --mktun --dev tap1 The state of the tap interface ...
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132 views

Networking issues KVM

I have a server that is running Debian 7.2. I recently set up KVM on it, and created two VMs. Both VMs are unable to connect to the Internet. I was following a tutorial, and I'm certain I followed the ...
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512 views

Slow VM installation on KVM

I have a standard (not modified) KVM+libvirtd installed on clean Centos 6 machine with 8G of RAM and 8 cores CPU. When I am trying to install guest centos 6 using virt-manager it takes ages to finish ...
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210 views

KVM permission denied on qcow2 disk over NFS

CentOS 6.3 running libvirt 0.10, trying to access/run a vm using a qcow2 on a Windows Server 2008 NFS mount. I tried nfsvers-3 when mounting but not luck, I get permission denied, presumably because ...
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114 views

KVM console with scrollback

I'm running a Linux guest on a Linux host with kvm -display curses. I'm not able to scroll back with Shift-PageUp. Is there an even simpler display than curses which just prints to the host terminal, ...
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295 views

Why don't the symbolic links in kvm autostart not work

I've deployed 2 kvm guests( db and app) on a Debian7 host. I can set them autostart by root@mhost:~# virsh autostart db root@mhost:~# virsh autostart app This actually creates 2 symbolic links at ...
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306 views

Exporting a snapshot in KVM to create a clone ala Hyper-V 2008

Hyper-V has a nice feature of allowing a snapshot of a VM to be exported, meaning a new VM is created with the state of that snapshot. How can the same be accomplished in KVM ? Qcow2 images on ...
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358 views

add a cgroup controller into libvirt

libvirt by default has cgroup controllers of ["cpu", "devices", "memory", "blkio", "cpuacct"] as shown in qemu.conf. I want to add one more controller of net_cls. I tried to modify the config file to ...
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94 views

Keep guest time after shutdown using KVM/libvirt

I use KVM/libvirt based virtualization. Some of vm guests have set date far in future (2-3 years, different month, day, etc) After each guest shutdown down, the date is being set to host date ...
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102 views

Finding out the location order of tap interfaces in KVM VM (Libvirt)

I have inserted 8 tap interfaces in a Cisco Libvirt xml file that will create a guestmachine running Ciscio iOs image: <interface type="ethernet"> <start mode="onboot" /> <target ...
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304 views

kvm/qemu via libvirt on CentOS - pass string or key/value or file to guest

I have a sizeable deployment of qemu/KVM VMs already, managed through libvirt. They're all CentOS 5 or 6 hosts and guests (the kernel lacks the 9p filesystem flags, so the "mount" shared filesystem ...
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153 views

virsh snapshot-create persistent through reboot/ domain destroy-start

If i take a snapshot of a qcow2 image backed domain via virsh snapshot-create domainID and I shutdown the machine (and probably destroy the domain if virsh list still shows it running), will that ...
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264 views

KVM USB Passthrough Performance

I have a CentOS 6.4 KVM host. I also have an ESXi 5.1 host. Under ESXi I am running a Ubuntu 12.04 guest with a USB TP-Link WN722N Wifi dongle. The Ubuntu guest runs an access point using hostapd. The ...
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176 views

Packets not going through Linux Gateway

Host: centos6 with ip 10.10.11.36 and gateway 10.10.11.33 Guest two vms with ip 10.10.11.60 and 10.10.11.57 and gateway of that of host ie 10.10.11.36 On host packet forwarding is enabled. from ...
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163 views

What is th tap100i0 device on my debian with KVM?

I want configure a network for virtual machines on KVM. I created a bridge. But I found a new tap100i0 devise was created. Should I take it into account to get the virtual network running?
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291 views

What are the differences in the configuration of the network on Proxmox (KVM)?

I have a dedicated server, one main public IP from /27 and two single public IPs also from the same /27 (I think the provider manages single IPs using the VLAN tags). I want to have a KVM running on ...
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68 views

KVM: RHE 4 guest hang for multi task usage

I want to host an old RedHat Enterprise Linux 4 with a 2.6.9 kernel on a Debian 7 core2duo host. The RHEL4 was originally deployed on a physical server and used only for development on old software, ...
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236 views

Proxmox 3.0 installation on any VPS

I have an account on digitialocean.com I create a droplet debian wheezy. I installed proxmox 3.0 manually via command line. At the end of installation I restarted the server but again it uses default ...
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150 views

Equivalent of VMwareResolutionSet.exe for Linux KVM

My company is planning on migrating from our current VDI environment that runs on VMWare and uses HP's RDS protocol, to a solution that is based on Linux KVM/Openstack. Many of the employees use ...
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48 views

looking for a fast way to copy a template to a KVM guest

My KVM guests each has a logical volume on the host to be the entire virtual disk. What will be a fast way to copy a template over to the guest's virtual disk? I tried to create a lzop compressed file ...
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588 views

KVM guest clock sync with host

I'm running KVM w/ centos 6.x. My guest vm clocks are booting with a 1-2 second lag from their host. My clocksource for the host is ntp. My clocksource for the guest is "kvm-clock", but I need to ...
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105 views

KVM copy contents of image into raw smaller LVM2 partition

I have a KVM guest, running on a KVM host...both Gentoo Linux. The guest is called webserver.img. It is 21 gigs large, but I am only using 5 gigs inside the image. I want to make a logical volume ...
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239 views

virsh attach-device for serial device

I would like to add a serial device (console) to a guest via the virsh attach-device command. I have a console.xml file containing: <serial type="pty"> <target port="0"/> ...
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264 views

IPMI console redirect (KVM) via java applet causes multiple keystrokes

I'm using a dell c6100 and can connect to the web based IPMI management tool, and I can get console redirection running via the java applet. But many keystrokes (especially enter) generate 2 or more ...
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280 views

gateway configuration in kvm guest while live migration

I configured the bridge which are connected to guests to communicate with outside. And In the guest, i configure gateway to indicate the bridge IP. (currently achieve this with DHCP) eth0 <--> ...
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61 views

Channelling DOM0 internet connection through DOMU

Bit of an odd queston but wanted to know your opinions on the following: I have a small computer that has Ubuntu (Both DOM0 and DOMU) virtualized using KVM. Now the person that will handle this ...
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150 views

how do I add a vcpu to one of my KVMs in QEMU?

I want to add a vcpu to a virtual server in QEMU. I tried editing the XML file in /etc/libvirt/qemu and starting the server, but that does not seem to work.
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56 views

Interface to comunicate with virtual qemu-kvm machine

I am starting virtual machine with command: /usr/bin/qemu-kvm -M pc-0.15 -cpu core2duo -smp 2 -m 2048 -name something -hda /path/to/disk.img -net nic -net user This machine get IP 10.0.2.15/24 ...
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165 views

KVM guest can't find gateway

I try to setup a KVM server with bridged networking. I followed the docs, but still can't get it working. The guest system can ping the host system and the host the guest system, so the connection ...
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1answer
140 views

scripted resize kvm images

I'm examining the possibility to script the resizing of a kvm image. The goal is to give our customers the possibility to upgrade their vps online. So for instance if a customer has a vps of 10G then ...
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1answer
316 views

Ubuntu 12.04 server - KVM - Networking - Assign dedicated IP to GUEST

Howto setup KVM guest to be reachable by a dedicated ip from www? In this case i would like to assign the ip currently on br0:1 to a virtualmachine. The problem i face here is that when i ssh from ...
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54 views

enabling modules for a kernel

I have a KVM/XEN VPS and would like to enable the following modules: ipt_LOG ipt_multiport ipt_state ipt_limit ipt_recent ipt_owner iptable_nat tun/tap iptable_nat ipt_MASQUERADE ipt_POSTROUTING PPTP ...
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189 views

See processes inside qemu

Sometimes a virtual machine inside kvm/qemu is saturated (load too high). Even a login (ssh) takes several seconds. But the host is still accessible. How can I investigate why the virtual machine is ...
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1answer
56 views

Share share with guest and use specific user id (virtd, kvm)

I am trying to get a shared path setup between a QEMU/KVM guest and the host. The problem I'm having is that KVM runs as the libvirt-qemu user (Ubuntu distro) and thus won't have permissions to any of ...
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287 views

iptables, forward traffic for ip not active on the host itself

I have kvm guest which's netword card is conntected to the host using a tap device. The tap device is part of a bridge on the host together with eth0 so it can access the public network. So far ...
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117 views

How to access vm inside a vm via VNC?

For some reasons I installed virtual machines inside a virtual machine, like this: A( B( C )) where A is the physical machine, B is a vm and the network type is NAT. And C is also a virtual machine ...
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184 views

listing of VM's created before libvirt installation or started by any other VM management tool

if my VM's are not created using virt-manager or are created using any other tool, then virsh system list command does not give them in the list of running VM's however they are running perfectly on ...
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1answer
52 views

Looking for input on Windows+Mac Clients setup

I'm in the process of building the architecture for a new SMB. Some decisions have already been made, but I'm looking for some input from the community. Basically, the fundamental problem I'm trying ...
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492 views

ping latency using vhost_net, macvtap and virtio

I have been testing network throughput and latency and I was wondering if my measurements are as expected. For the test, I used Fedora 17 for both host and guest, using kernel 3.5.2-3.fc17.86_64. ...
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1k views

How to limit usb 2.0 port to work as usb 1.1 in ubuntu?

Ive got problem with kvm usb forwarding and printing (windows xp guest goes BSOD when i try to print something). Ive been adviced to change usb to 1.1 version. That only kvm works with 1.1 not 2.0 ...
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290 views

Cannot connect to SSH intermittently , sshd is running, and other services are online and operating without disruption

So when doing this: ssh -l root myKVMinstance.domain.com i get this: ssh: connect to host myKVMinstance.domain.com port 22: Operation timed out at the same time while that is happening, i am ...