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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2
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1answer
59 views

KVM fastest network between 2 guests

I wonder if there is any way to speed up the network communication between 2 KVM guests on the same physical machine. Would that help at all if I would configure a separate bridge network for just ...
1
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0answers
98 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 ...
2
votes
1answer
65 views

ganeti network: change bridge name

I try to add an instance to network, first first I need to connect the network to a bridge. I'm using bridge vbr0 instead of standard xen-br0, gnt-cluster info shows that ganeti has the default set ...
0
votes
0answers
344 views

virsh shutdown not working on linux guest

Solution to this issue is usually installing acpi on the guest vm and making sure the vm has the following: <features> <acpi/> <apic/> <pae/> </features> I have that, ...
0
votes
1answer
180 views

Import a vm image to a new host machine with virt-manager

I need to recover a guest machine with Windows 2003 on a new host server on Centos 7 with virt-manager. I've shut down a guest machine and simply copied its .img file from /var/lib/libvirt/images. ...
0
votes
2answers
119 views

Iptables on Centos 7 doesn't work after reboot

I am on Centos 7, removed the new firewall and installed a classic iptables service. I have a guest machine in it with Debian 8.1 and static external ip. I do: echo 1 > ...
0
votes
2answers
1k views

Exporting libvirt+KVM virtual machines to files

I am going to retire an old libvirt + KVM server, but I need to preserve the VMs. Unfortunately, the network is down and I cannot create connections to the system. Is there any way to export the VMs ...
2
votes
2answers
461 views

KVM Virtual Server Disk Resize on Ubuntu with GParted

We have Ubuntu 14.04 server on KVM with MySQL database which is just close to fill its disk space, which is 80 GB. We have upgraded the server to 160 GB disk, but the problem is that the new disk ...
0
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0answers
27 views

No package transfer from host to guest on KVM

I want to assign external static IPs to my KVM guests. I do not prefer a NAT solution. What should be the configuration of network and routing tables? I manually assing a static IP to guest. I can ...
0
votes
2answers
32 views

Can libvirtd be used without kvm?

I wanted to try libvirtd with virt-manager (I wanted to test migration.) on a virtual machine (without nested virtualization support enabled, so no kvm...), and I expected it to work (and use full ...
1
vote
1answer
166 views

Extend KVM Volume

I have this setup on KVM Host: virsh # pool-info --pool pool Name: pool UUID: bb13c37c-47fe-c4a9-78a4-9c8abc7524fe State: running Persistent: yes Autostart: yes ...
6
votes
1answer
65 views

Prevent hijacking IPs in KVM/libvirt

How can I prevent a VM user/client from accessing IP addresses he doesn't own but are routed over the same bridge on KVM/Libvirt? IP addresses are routed to a cisco switch vLan consisting of a /24 ...
0
votes
0answers
223 views

Is it possible to passthrough a USB-hub and its devices to a libvirt guest?

Since I am having multiple devices in a libvirt/qemu Windows 8.1 guest I need to plug in and out rather often, I am wondering if it is possible to make life a bit easier. Is it possible to pass ...
0
votes
1answer
71 views

Open VPN and Virtual machines

This is my environment: centos 7 running Gnome with KVM two virtual machines running centos 7 Gnome desktop This is what I would like: Users to log into the any virtual machine from either the ...
0
votes
1answer
217 views

Remote Desktop to KVM Virtual Machine on Centos 7

I have a virtual machine created on centos7. I want to remote connect to it via another computer besides the host. I can not seem find how to access it. I have it set up with a username and password. ...
0
votes
0answers
31 views

KVM Virtual Machines and Public IPs

I currently have some Virtual Machines on my business dedicated server using the KVM layer as apposed to Xen or other virtualization methods. I was wondering if I could get a "best practice" on ...
3
votes
1answer
78 views

How to make sure qemu-img resize does not lose data?

I'm trying to understand how qemu-img resize shrinks the virtual disk. Let's say qemu-img info shows that the virtual size is 20G, and the disk size is only 1G. Now I want to shrink the disk from 20G ...
1
vote
1answer
623 views

Centos 7 public static IP address for a KVM guest

I am on Centos 7 with KVM and virt-manager installed. I have a virtual (guest) machine with Debian 8.1 on it. Network on guest was configured with virt-manages using NAT (with default settings). So ...
0
votes
0answers
140 views

Two NICs for one KVM guest

I deleted an old KVM guest and now have a spare IP address. I now assigned this (previously working!) IP address to another KVM guest, like so: virsh # attach-interface my-guest bridge br0 vnet1 ...
0
votes
1answer
115 views

virsh adding x2apic, cache specific options to kvm config

Anybody know the syntax how to add +x2apic to the virtual machines xml files when I edit them with "virsh edit vm"? From the command line it would be starting with this flag: qemu -cpu ...
2
votes
1answer
552 views

QEMU multiple port forwarding

I would like to forward more than one port. This command run my VM and forwards RDP port successfully: qemu-system-i386 -net nic,model=rtl8139 -net user,hostfwd=tcp::3389-:3389 -m 512M -localtime ...
0
votes
0answers
18 views

Migration from kvm to xen [duplicate]

It is possible to migrate the instance from kvm to xen hypervisor, being migration from full virtualization to paravirtualization , is it possibile.
1
vote
1answer
277 views

virsh: error loading shared libraries: libyajl.so.2 is missing

I just tried to setup some KVMs on RHEL7. My procedure was: yum install qemu-kvm qemu-img yum install virt-install libvirt libvirt-client libvirt-client The I tried out virsh list --all to ...
3
votes
2answers
4k views

Install windows 2012 R2 over KVM-virtualizaton

I'm trying to install Windows Server 2012 R2 over linux KVM-virtualization. The installation process stops and requires drivers to continue. I'm trying with virtio drivers from fedora but doesn't ...
1
vote
1answer
57 views

Is it possible to install virt manager in client mode?

I have a KVM server (updated to Ubuntu 14.04) for several years now, that I handle distantly with virt-manager under different Linux flavours. I recently formatted and reinstalled my main workstation ...
0
votes
2answers
70 views

KVM debian wheezy packages with ceph support

Does anybody know any packages out there for kvm which are compiled with RBD support? I have these installed right now: ii kvm 1:1.1.2+dfsg-6+deb7u8 amd64 ...
-2
votes
1answer
170 views

How do i find the overcommit ratio for CPU on a KVM host or for that matter on any hypervisor?

I have a host and I have installed KVM on it.Now I need to know how much overcommiting of resources it allows, CPU, memory. Is there some command to get the ratios or it all exists in theory and no ...
0
votes
0answers
38 views

How to prevent virt-viewer from asking a password

I am aware of what file I need to create, in order to prevent virt-manager from prompting me for a password. However, I'd like to create a shortcut on my desktop that opens directly the virtual image ...
3
votes
0answers
439 views

QEMU USB passthrough is not working

I stuck at getting USB passthrough working with Windows 8.1 guest OS on Ubuntu Server 14.04. I started by installing qemu using the Ubuntu Documentation (https://help.ubuntu.com/community/KVM). The ...
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votes
1answer
58 views

How to edit the XML config file of a domain with virsh? [closed]

How to easily edit the XML config file of a domain with virsh?
0
votes
1answer
366 views

kvm/qemu host windows guest BSOD about driver_irql_not_less_or_equal for viostore.sys

I have a KVM/Qemu host running 4 Windows Server 2012 guests and after upgrading the host from Ubuntu 12.04 to 14.04 I get blue screens with a bug check string of "driver_irql_not_less_or_equal" that ...
0
votes
0answers
71 views

Monitoring / logging bandwidth usage per KVM on SmartOS?

Usually on a KVM node with CentOS, iptables support is enabled on the bridge (bridge-nf-call-iptables) iptables rules can be used to log the data, 2 chain rules one for incoming and one for outgoing ...
0
votes
0answers
44 views

OpenNebula host CPUs count altering

I am playing around with the latest OpenNebula sandbox for VirtualBox. In the "cloud" view, where users can create and delete their virtual machines, the CPU cores dedicated to each machine are ...
1
vote
1answer
212 views

Creating a virtual network for KVM guests spanning multiple host machines

I have 5 physical machines running Ubuntu 14.04, all of them are together in a network. These all have static IP addresses. Each of these machines has 1 to 4 virtual machines via KVM/QEMU running ...
0
votes
1answer
169 views

Trouble Switching From non-VLAN to VLAN-Enabled Network with Sophos Gateway

Nasty conundrum here. Some background: I have a Sophos UTM ASG220 serving as gateway device for a number of networks, with a Cisco 2960 network switch, and a raft of Red Hat 6.6 servers running KVM ...
0
votes
2answers
314 views

Add a network bridge to Ubuntu and lost internet and lan connection

I'm trying to make network bridging to work on a Ubuntu 15.04 (I'm experimenting in order to make a QEMU/KVM virtual machine that will be visible to the outside network as if it were a distinct ...
0
votes
0answers
239 views

Putty SSH connection timed out but OVH KVM ok

I dont know why today SSH give me an error but i can ping server and connect to SSH via OVH panel with KVM I reboot my server, load new config in putty, change try alive option to 200, change user ...
0
votes
1answer
64 views

enable vnc after virt-install

I've created a virtual machine using virt-install with graphics --none. I want to enable vnc. I've tried virsh -c qemu:///system qemu-monitor-command vm171-SC-1 --hmp change vnc :3 but it doesn't ...
3
votes
3answers
794 views

Is it safe to boot a linux server from a USB drive?

I have an HP DL360 G7 server I plan to install KVM and ZFS on. The purpose is going to be a lab in a box. I have the 8 drive bays in the front loaded with 4 drives and an SSD (for the ZFS ZIL cache). ...
0
votes
1answer
64 views

Kickstarting RHEL7 VM stalls with “No device selected”

I've been using Ashgar Ghori's RHEL7 study guide and have hit a small snag which I have not been able to find a solution to. Using a kickstart file that worked previously, whenever I use it for a new ...
0
votes
0answers
24 views

Configuring additional static IP for Guest Machine

I am trying to bind my Guest machine to respond on my second public IP address. Sometimes it works automatically by DHCP just by configuring my MAC address, sometimes it doesn't work at all. All I ...
0
votes
0answers
96 views

Stucking qemu-kvm process

What i have: CentOS 7.1 as KVM host - Xeon E3-1200 v2, 32GB RAM, with and without dedicated raid controller (i tried both options) 3x Ubuntu 14.04.2 as quest VM (3 CPU, 512MB RAM on each VM) host ...
0
votes
2answers
126 views

Creating several kvm bridges over tagged bond

I have the following configuration in a RHEL6.5 which works great. # ifcfg-em1_2 DEVICE=em1_2 HWADDR=C8:1F:66:D8:77:D2 TYPE=Ethernet ONBOOT=yes NM_CONTROLLED=no MASTER=bond0 SLAVE=yes USERCTL=no ...
1
vote
1answer
200 views

Is there any way to lock/unlock a Hosted Engine in oVirt?

I have a weird situation with my Hosted Engine in oVirt. We have an oVirt cluster set up using gluster as the storage for the engines isos and all the information. About a week ago two of the three ...
0
votes
0answers
70 views

Openstack Icehouse - Hypervisor (KVM) cpu_mode config

I have installed Openstack Icehouse, using the guide located here, and I am trying to find out what 'cpu' is exposed through the hypervisor to a VM. I have found this guide in order to configure the ...
1
vote
2answers
323 views

Virtualization: vCPU pinning with Hyperthreading Host CPU?

I'm using KVM/libvirt on a Linux server with Core i7-2600 CPU, which has the following CPU topology (1 Socket, 4 Cores, 8 Threads): Physical | Logical ---------+-------- Core 0 | 0, 4 Core 1 | 1, ...
1
vote
1answer
61 views

KVM Bridged connection not forwarding ports?

Host and guest are both CentOS 6. Guest has an admin panel listening on port 15672 that I am unable to access from the outside. From the guest, curl localhost:15672 and curl vm1:15672 give me the ...
2
votes
2answers
812 views

Linux Routing with two NICs (LAN vs Internet) with NAT and bridging for VMs

My Setup: There is only one physical machine in this setup, a Host System for Virtual Machines (VMs) with two network adapters. One NIC (eth0) is connected to an internal network (LAN subnet, e.g. ...
0
votes
1answer
867 views

Installing VM on CentOS 6.6 with virt-install hangs

I'm trying to install a Centos 6.6 VM on a CentOS 6.6 host with the following command. virt-install \ --name vm-queue \ --description "Queue Server" \ --ram 2048 \ --disk ...
0
votes
0answers
132 views

mdadm and LVM high load and IOwait

I've got a new CentOS 6.6 server with 2 HDD with mdadm & LVM. As I've used the CentOS install CD I assume everything should be aligned properly. I've just written a KVM image to a LVM LV using dd ...