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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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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185 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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1answer
77 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 ...
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835 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
63 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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1answer
150 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 ...
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1answer
173 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 ...
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2answers
68 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 ...
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2answers
329 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 ...
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0answers
78 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. ...
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1answer
413 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 ...
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0answers
63 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 ...
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1answer
150 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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0answers
984 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 ...
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2answers
137 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 ...
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1answer
114 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 ...
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1answer
498 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 ...
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46 views

KVM Networking guest issue due a provider networking limit

I have a KVM setup on Centos 6.4 64 Bits. My server provider assign us a Main IP to the Host with a gateway and netmask. Also our provider assign us additionals IP ( not in the same block as the Main ...
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122 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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223 views

Open vSwitch double VLAN tagging is ignored

I'm trying to add a flow to a KVM machine using Open vSwitch 1.10.2 for it's networking, which double tag all traffic comming from one of the virtual machine's ports. I'm using the following command ...
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63 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 ...
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2answers
721 views

Windows Server 2012 on KVM on Ubuntu 14.04. Runs well for a while and then slows down

I have Windows Server 2012 Essentials running as a VM on KVM running on Ubuntu 14.04 LTS. It performs very nicely after a reboot but after a while it starts slowing down and getting sluggish. This ...
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2answers
114 views

Migrating physical machine to KVM

I have a fairly old debian machine that I need to migrate to KVM-Qemu. What I started is to make a tarball of the root filesystem: tar -cpf rootfs.tar --exclude='dev/*' --exclude='proc/*' ...
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1answer
116 views

KVM bridging for virtual machines is not working

After restarting the server, I can not ping and reach my virtual machines from the net and vice versa [root@pc1(192.168.0.114) ~]# ping 192.168.0.63 PING 192.168.0.63 (192.168.0.63) 56(84) bytes ...
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1answer
153 views

Why do I lose network connectivity for a virtual machine outside /24?

I have a bunch of virtual machines (Ubuntu Server 14.04) hosted on a single real server (Ubuntu Server 14.04 with KVM). The number of virtual machines grow, and I'll soon have more than 254 of them. ...
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1answer
78 views

openvswitch with multiple vlans

I'm having an issue wrapping my head around a setup. We currently use vmware+vsphere and switching to kvm. So we want the similar type setup using openvswitch. So our setup will be like kvm host ...
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3answers
96 views

VLAN based interfaces for virtual machines

I am in the process of designing an experiment in which we have multiple VLANs arriving at a single NIC, with each VLAN being associated to a single VM. The straightforward way to do this would be ...
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1answer
105 views

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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1answer
77 views

weird bridge issue in KVM

on Centos 6.5 i have a bridge network connected to eth4 and my virtual machine (Centos6.5) running on KVM is also connected to that interface(vnet0) bridge name bridge id STP ...
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1answer
46 views

Where are rhev templates stored?

I would like to modify a Red Hat Enterprise Virtualization (RHEV) template. I know I could just use an existing machine and create a new template from this machine - but it would require updating ...
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0answers
55 views

bad inodes in KVM guests

I ran a script to snapshot all logical volumes from KVM guests and backup. But /var/log/messages reported these errors: Jun 02 09:57:08 server lvm[24245]: Monitoring snapshot ...
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1answer
95 views

KVM - Advantages of Installing From PXE

I have been looking at various ways to install KVM guests and am currently using base install ISOs combined with kickstart files automatically install/configure them, but sometimes use cloning. ...
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1answer
455 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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107 views

KVM : domain names are resolved, but cannot ping

I've found that in KVM, my networking is acting funny. Oddly (1) I can resolve external internet locations using nslookup or ping , but I cannot actually receive a ping back. (2) I cannot ping ...
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1answer
202 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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48 views

Problems on using KVM Guest as router

We have two private subnets on different locations BJ and SH. in BJ, subnet is 10.1.0.0/16 in SH, subnet is 10.2.0.0/16 We want them connected, so we build a tunnel through public internet using ...
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1answer
90 views

CentOS 6.5 Server Lockup

Today one of our CentOS 6.5 KVM nodes from OVH crashed after 46 days of uptime and we were unable to find the reason why, we had this issue before with the OVH kernel on another server but this one is ...
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1answer
104 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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1answer
65 views

KVM Dynamic Rate Limiting

How can I dynamically rate limit the network speed on individual KVM instances? For example, I want to set a rule where if a user uses over 100mbps inbound or outbound bandwidth for over 30 minutes, ...
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1answer
38 views

KVM Server error

I have installed KVM server in Centos 6.4 and i have created gluster storage pool in that gluster storage pool i have installed some linux and window VM's i have assigned 1GB RAM and 20 GD virtual ...
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0answers
165 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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449 views

CentOS 6 KVM Host cannot connect to Internet while VMs can

I've configured a CentOS 6.4 server as a KVM host running multiple VMs. VMs running on this KVM host are fine. The problem is: the host itself cannot connect to the Internet. External addresses ...
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2answers
429 views

Best type of virtualization when CPU has more threads than cores

I have a 4 cores/8 threads Intel Xeon processor. This is something I tried to particularly ask in SolusVM support, however I haven't got a good reply. I even don't know if they are right: they told me ...
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2answers
368 views

Force an LXC container to use its own IP address

Sorry if this question has already been asked. I could not find it, I have this setup : +---------------------------------------------------------------------------------------------+ |HOST ...
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1answer
64 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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73 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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89 views

Asus ASMB4 KVM - How to restart from bash command line?

I have a remote server that hasnt been access in a while and it seems the KVM web interface is not working. I can SSH in and get a prompt but I dont have any idea how to either: -reboot the KVM only ...
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2answers
1k views

Ubuntu 14.04 KVM host - not allocating KVM guest correctly, high load

Encountering an odd issue with Ubuntu 14.04 KVM hosts/VMs. We have a number of physical machines, all the same spec, but when we try and start the same type of KVM image (OpenNebula is managing the ...
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71 views

Windows 2003 server on KVM. Device manager shows error for processor. What CPU should I emulate?

I have moved a Windows Server 2003 VM from VMware to KVM running on Ubuntu 14.04 LTS. It's working very well. The only thing that is not perfect is that Device Manager on the Windows guest shows the ...
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1answer
620 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> ...