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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562 views

KVM guest with acpi installed will not shutdown

I have KVM installed and working on my Debian 7.1 host with two Debian 7.1 guests and some Windows XP guests. When I shutdown using the command 'virsh shutdown ' or hitting the shutdown button in ...
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1answer
96 views

kiB memory of physical ram (linux)

How can I find amount of physical memory on linux. Background: I want to be sure, that the sum of all kvm machines, don't use more RAM than available. I can find the kiB sum like this: for dom in ...
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2answers
278 views

Install ubuntu on my KVM VM by proxmox

I'm a newbie here but I would like to understand how to install ubuntu or centOS on my VM created by KVM (in proxmox). During creation, I've set Linux 3.X/2.6 Kernel (l26) in sheet OS and Do ...
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0answers
94 views

Problems using wondershaper on KVM guest

I am trying to limit bandwidth on one of my KVM guest using Wondershaper. Doing something like this works fine: wondershaper br23 9000 9000 Doing a wget with the setting above gives a download ...
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2answers
118 views

KVM XML config file

I have a KVM server that I expanded the LV of then rebooted. However now when booting I get the error: error: Failed to create domain from /home/kvm/kvmx/kvmx.xml error: (domain_definition):1: ...
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157 views

KVM - task foo:1234 blocked for more than 120 seconds - howto change task scheduler

I recently installed a new Debian Wheezy server with KVM (the "KVM Host") then installed a Debian VM on the KVM (the "VM"), and got very bad performance on the VM. Looking through dmesg on the VM, I ...
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2answers
122 views

qcow2 overlay growing too rapidly

virsh 0.10 I am using qcow2 overlay and a backing file, also qcow2. The overlay is growing way too quick, more than 20 GB in 24 hours, even though I am not writing very much to disk. Is this ...
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1answer
183 views

KVM Slow performance on XP Guest

The system is very slow to do anything, even browse a local folder, and CPU sits at 100% frequently. Guest is XP 32 bit. Host is Scientific Linux 6.2, Libvirt 0.10, Guest XP OS shows ACPI ...
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1answer
116 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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2answers
646 views

How to test KVM guest CPU maximum allocation limit?

Running Ubuntu 13.04 Host and vm Guest. Using virtio for hdd, nic. Max-allocaion CPU cores is 6, minimum is 2. here is a screenshot for clarification: http://i.imgur.com/GmYQBMP.png Ive made a vm ...
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1answer
72 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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2answers
121 views

KVM guest halt to make the host kvm exit

I'm running Linux inside kvm. When I issue the halt command as root in the guest, eventually the guest halts with the kernel log message System halted.. However, the kvm host process keeps running. Is ...
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1answer
219 views

Encrypt connection to Spice console in browser using HTML5 Spice client

At the moment i'm testing a way to connect to my VMs running on kvm-servers using spice and a browser html5 spice client I found. It was easy to set up, following this guide: ...
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1answer
143 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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1answer
95 views

Unbridged tap device

Good UTC evening! I've created a tap0 device on my host, it looks like: tap0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 inet 10.0.0.1 netmask 255.255.255.0 broadcast 10.0.0.255 ...
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2answers
995 views

SmartOS Virtualization with one public IP address

Is it possible? (title of this question) Googling Virtualization with one public IP address yields nothing useful What I have: SmartOS on a dedicated server. Dedicated server has one public IP ...
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0answers
152 views

KVM - 2 external IPs - NAT - forwarding multiple ports to multiple VMs

I have a server with one network device and two external IP addresses. This server is running Debian 7. On this server I want to run two or three virtual machines using kvm/qemu. I want to use both ...
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2answers
192 views

Error KVM-based VM migration

Virtualization environment: KVM Source host: CentOS 5.9/64 Target host: CentOS 6.4/64 As proof of concept before migrating a production machine, I created a small VM & put a minimal Linux ...
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2answers
107 views

libvirt (KVM) inventory application?

I've got a bunch of LibVirt-managed (locally using virsh) KVM VMs on standalone Linux hosts (local KVM, local storage). Is there any web-based application out there that will track the inventory - ...
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0answers
31 views

FUSE KVM with OpenVZ

I have a KVM vps and a OpenVZ vps. I want to FUSE/mount the KVM vps to my OpenVZ vps because the KVM has lots of space but my OpenVZ has less space & high RAM. How can I do this?
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1answer
2k views

Multiple, different VLAN trunks to KVM guests (Linux)

I've hit a roadblock of sorts with an architectural challenge. I've got a server running KVM - which will feature a number of guests, some running virtualised firewalls and others, just plain web ...
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1answer
51 views

KVM-virtualization Host and Guest NoGraphics

i was wondering is it possible to run a virtualized KVM host with no graphics. i dont want to install x11 on the host or the guest either for that matter, they are only going to run linux console ...
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2answers
346 views

Optimal kernel configuration and patches for KVM host

I have a server (single socket Nehalem w/ 24GB RAM) acting primarily as a KVM host containing a bunch of Windows Servers and a few (tickless) Linux instances. I usually compile my desktop kernels ...
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0answers
291 views

Routing suddenly broke on a KVM guest

I have a CentOS-based host and a KVM Debian-based virtual machine on it. A host has an Ethernet bridge on its external network interface, this bridge is used by KVM: br0 Link encap:Ethernet ...
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1answer
105 views

KVM host only using one core out of 8

This KVM host is only running one VM/guest right now, and it is running with -smp 1. Top shows only the first core being active. Is that expected when using -smp1? The guest OS is Windows XP. The ...
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1answer
158 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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0answers
114 views

qemu-img rebase operation taking longer than expected

#ls -1 Image1.qcow2 #qemu-img create -b Image1.qcow2 -f qcow2 Image1-DeltaFile.qcow2 Now I have an overlay called Image1-DeltaFile.qcow2. If I have another copy of Image1.qcow2 on a different ...
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0answers
79 views

Guest machine can't access internet

I've installed kvm, libvirt and virt-manager suite to configure and install virtuals machines. All work fine (virtual machine managing, vnc) but my virtual machine can't access internet. Virtual ...
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3answers
538 views

Guests can't access KVM host server by name although nslookup and dig returns correct record

So I have a KVM host that also runs an apache server with some yum repos. The VM guests are connected to the default virtual network, which is configured to offer DHCP and forwarding with NAT on ...
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1answer
174 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 ...
4
votes
1answer
1k views

Is OpenStack live migration possible without shared storage?

Like many people I am considering creating 'private cloud' using either OpenStack or VMware. VMware vMotion has a nice feature which allows Live Migration of VMs even without shared storage. I have ...
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1answer
212 views

Import virtualBox appliance to KVM

Im new using KVM as a virtualization solution. Currently I'm using VirtualBox to manage my virtual machines in my personal computer, but I'm moving my virtualization to a Server, so I set up a Linux ...
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1answer
204 views

Qcow2 backing image and overlay idea

I have 2 KVM servers running Windows Guests. I want to create a Qcow2 image with Windows 7 on it, install the base software needed, and then make that a backing image, read-only, with one qcow2 ...
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1answer
1k views

KVM + NFS poor disk performance

Situation: We have an Ubuntu server that hosts three VMs using KVM. All guests as well as the host need to access the same files in a certain subfolder of /var . Thus, the subfolder is exported via ...
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1answer
143 views

Mounting an LVM snapshot and converting file: is it safe?

I have KVM running and need to convert some qcow2 disk images from running guests into vmdk format. Is it safe to take an LVM snapshot of the logical volume that the qcow2 file resides on, mount it, ...
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2answers
50 views

Automatic VM disk resize

I got a KVM/Qemu setup that works great. Now I want to streamline the provisioning of new VMs. The two obvious ways are to either clone an existing disk or install from scratch (with an automated ...
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2answers
1k views

virt-install KVM “Cannot open display ”

So I am trying to create a VM using KVM (on CentOS 6.3) and the command I use is as follows: virt-install --connect qemu:///system --virt-type kvm --name ffVM32 --ram 1024 --disk ...
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1answer
197 views

Clone/Backup Strategy for VMs between ESXi and KVM requiring clones to run concurrently with original VMs

I am stuck on this problem and need help. ESXi Free version 5 and qemu-kvm/libvirtd version 0.10. I will put the TL;DR first since it captures the problem fairly well. TL;DR I have 2 VMs on a KVM ...
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1answer
71 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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3answers
227 views

qemu don't start quest with disk image on tmpfs

I have 32bit windows 2k3r3 guest (terminal server) with 4GB guest ram and swapping. I created separate disk image for guest swapping and user's temp dirs. I have enouth RAM in host system and want ...
0
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1answer
93 views

Is Open vSwitch necessary for my setup?

I've been considering moving my VMware-based dedicated server to Linux using KVM/QEMU. The only major hurdle remaining is networking. My current setup is: NIC <---> Public vSwitch <---> ...
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1answer
453 views

OpenStack Instance not using up full space

I have created new instance with Centos 6.4 with 20 GB Disk Space but when i logging to the VPS and Execute df -h the space shown as the following Filesystem Size Used Avail Use% Mounted ...
0
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1answer
81 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 ...
0
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1answer
170 views

KVM Virtual windows7 Paused on starting in Centos

I'm running CentOs 6 and just installed Windows7 in KVM Virtual Machine Manager, But when starting the win7 virtual machine then goes to pause mode , the following content of our win7 xml file : ...
2
votes
2answers
509 views

Can I run a KVM guest with a btrfs subvolume as file system?

I want to run a virtualized Debian stable KVM guest on a Debian stable host (to run untrusted stuff like Skype, Flash or eclipse with third-party plugins). Naturally host and guest will have many ...
2
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0answers
172 views

Why does an IPv6 route added before virtual machine is started not work

I have an external server at Hetzner with Debian 7 and trying to setup KVM with IPv6 Routing (the same setup works for IPv4 without problems). I have one Ubuntu Server VM with two interfaces which ...
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1answer
488 views

Ubutu/KVM: High iowait on guest nodes, root node fine

Recently one of my boxes has been running quite slowly. It's running Ubuntu 12 LTS and kvm to split the server into several nodes. The box has 2 normal SATA drives using software RAID-1. One of the ...
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1answer
799 views

Configure DHCPD with assigned IP address and gateway on different subnets for KVM [closed]

I have a dedi with an IP range of 123.123.123.1/24, the problem is the gateway address: 111.111.111.254 and it's on completely different subnet. I have already setup a bridge and KVM virtualization. ...
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1answer
210 views

DD broke my whole partition - boot failed: not a bootable disk . Any way to recover it?

Im kind of freaking out here, if anyone can help me please help me... This happened to a Windows 2012 KVM virtual machine. I had a very important database running in it, if I could only recover that ...
0
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1answer
101 views

libvirtd - Getting vps to use existing bridge

I've been working on getting KVM running on CentOS 6.4 and ran into a snag. After pouring through several online docs about setting up a bridge for the vps to connect to, and manually attempting to ...