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 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
40 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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202 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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661 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
626 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
482 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
89 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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0answers
122 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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1answer
105 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
2k 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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107 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
968 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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1answer
306 views

How to increase KVM guest disk size using LVM VG as storage pool?

The KVM host server is running CentOS 6.5 and a LVM volume group "storage_pool" is used as the main storage pool for KVM. An Ubuntu guest is installed using an ext4 filesystem and mounts the whole ...
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668 views

Apache bench failing with error “No route to host”

Got a new dedicated box. Installed CentOS 6.5 Installed KVM Installed a CentOS 6.5 guest rsync'd websites/database/settings etc over from existing VPS. Set up "dedi.mydomain.com" in DNS to test it ...
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1answer
358 views

Can't use yum on guest - suspect port 80 forwarding in iptables on host at fault?

What's wrong with this set-up? Both host and guest are CentOS 6.5 Specifically, I can't run yum on the guest. I can ping happily to/from the guest, including pinging mirrorlist.centos.org If I ...
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0answers
2k views

“Network error: connection refused” when trying to SSH to guest VM

CentOS 6.5 host, CentOS 6.5 guest. Using kvm. VM gets a local IP from the virbr0 interface. I've set up some port forwarding in iptables. port 80 forward works, but my SSH forward does not. ...
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2answers
635 views

How to give my KVM guests network connectivity? [closed]

I'm completely new to KVM and the whole idea of virtualisation, but have been reading about it for a couple of days and playing with it for the last few hours. Creating, installing, cloning etc... ...
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1answer
55 views

KVM image size has changed

We had a 180GB VM image. Inside the guest VM everything is OK and hdd size is 180G. but when we look the image size on the host it is 475MB. I am afraid that if we restart, the VM wouldn't work. I ...
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1answer
235 views

Issue with OpenShift Origin VM on Debian

I'm following this guide to install an OpenShift Origin VM. But Fedora is complaining at the end. It is saying that /dev/disk/by-uuid/xxx does not exist and by consequences, it seems that it is not ...
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1answer
234 views

SolusVM with KVM and HVM disk limits

I have searched google and also asked SolusVM directly in a ticket just now. I cant seem to find the answer anywhere. Im curious what the max disk space of KVM and also HVM vps units is? I have a ...
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1answer
247 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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2answers
5k views

proxmox KVM routed network with multiple public IPs

I have a dedicated hosting with hetzner. Additionally i have bought a 6IP subnet. My main IP is: 148.111.111.200 My main subnet is: 255.255.255.224 My additional IPs are 148.222.222.1 to ...
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1answer
408 views

vanilla ubuntu-vm-builder on i7 aborts aborts (with PAE?)

host: intel i7-4* cpu, running linux kubuntu 14.04 guest: attempting to create. ubuntu-vm-builder kvm saucy eventually, Get:1 http://archive.ubuntu.com/ubuntu/ saucy-updates/main ...
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1answer
2k views

how to clone a VM on LVM to another in KVM?

On a Debian wheezy i installed KVM for virtualization and install some VMs on it. I use separate LVM disks because of its performance for my VMs disk. Now i need to clone one of them in new LVM disk. ...
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135 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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1answer
224 views

KVM: Machines unbootable after host reboot

Im finding that my KVM guests are unusable after i reboot my host. Specifically, I always get this error: Booting from hard disk Boot failed: not a bootable disk What causes this error? ...
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1answer
314 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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1answer
157 views

kvm hypervisor kernel panic

My kvm hypervisor had been running with 20+ vps guests for a few months. But a few days ago it went to kernel panic. There were no abnormal operation that I found would cause the problem, except that ...
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0answers
70 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 ...
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0answers
48 views

kvm guest cannot initialize network

I'm running a kvm ubuntu guest inside ubuntu both 12.04. Using KVM manager for this. Initially everything was fine, could connect from the guest to the internet, the host all right. But all of a ...
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1answer
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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645 views

Optimizing disk performance on KVM VM configuration

I have a KVM host server running Ubuntu 12.04 LTS, bare bones installation with only KVM installed. The server has an 8 Core Intel(R) Xeon(R) CPU E3-1230 V2 @ 3.30GHz CPU with 32GB of RAM and SATA ...
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1answer
115 views

Should I use FAT or NTFS when using Windows XP as a KVM guest? [closed]

I am installing 32-bit Windows XP as a KVM guest on CentOS 6. Should I be using FAT or NTFS filesystem and why?
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2answers
2k views

Can I have virtio-win package on CentOS?

In "Red Hat Enterprise Linux 6. Virtualization Host Configuration and Guest Installation Guide" in chapter 10.1 "Installing the KVM Windows para-virtualized drivers" it says: The virtio-win ...
0
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1answer
35 views

List all devices emulated for a VM

I have created a VM with the below command in qemu . (KVM enabled) #qemu-kvm -m 1024 -enable-kvm -hda /var/lib/libvirt/images/fedora.img NOW, VM is launched. I would like to know the exact devices ...
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1answer
179 views

Cannot add any virtio discs in virt-manager, how to fix?

I’ve just freshly installed virt-manager and libvirt-bin (and related packages) on a Debian sid system, and have a strange problem I’ve not yet seen on another similar installation: When creating a ...
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0answers
778 views

Any disadvantage of running a virtual machine using files for its drives hosted on freenas/zfs?

I recently got tired of the really slow I/O reads and latency (10-30 MB/s read, not sure for latency but very slow) from a provider I rent a virtual machine from. He uses freenas, the virtual machine ...
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1answer
244 views

Relationship between KVM Virtualization Host and Guest resource utilization

I have a KVM Virtualization host with 8 cores and 32GB of RAM. The machine is used to host VMs used in evaluating software, configurations, etc. Typically there are 2-4 VMs running simultaneously. The ...
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0answers
39 views

Discreet Graphics Over IPMI

We have an Asus RS100-E7/PI2 with an additional ASMB5-iKVM IPMI add on. We use Nvidia G210's in a dual screen set up, dummy forced VGA as the main and a secondary screen HDMI output to an encoder ...
0
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1answer
90 views

Emulate VMware vswitch on KVM [duplicate]

I'm wondering how I would go about emulating how a standard vswitch works in KVM. In VMware you have the following: vmnic -> vswitch(tagged) -> port group (untagged) So all traffic going to the ...
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1answer
1k views

Which CPU model to set for guest KVM when processor is Ivy Bridge?

For a KVM host with an Ivy Bridge processor, which MODEL should use for CPU>CONFIGURATION in Virtual Machine Manager? Ivy Bridge is not available.
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1answer
316 views

Persistent Network Configuration using KVM and libvirt

Our environment will have a KVM host setup dynamically using kickstart (easy enough). The hard part is dealing with network configuration and keeping VLAN configuration (and possibly bridge/host ...
3
votes
1answer
644 views

Migrate CentOS VM using LVM on IDE to run with VirtIO

I'm trying to migrate existing IDE-using, LVM-based CentOS 5.2 VMs to use virtio. The symptom is a kernel panic upon boot when the system can't find any volume groups. Does anyone know how to make ...
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1answer
135 views

Bridging is breaking the server: KVM configuration

I'm pretty new to networking and just can't get my head around this. I'm trying to setup KVM-Qemu so I can run some virtual machines. The instructions I'm following are telling me to use eth0 and ...
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2answers
605 views

How do I configure bridged networking for VMs

I'm setting up a KVM virtualization server in CentOS 6. How do I configure bridged networking? (I think I need network interface eth0 to be accessible to VMs) I have tried to follow this guide: How ...
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1answer
440 views

CentOS Virt-v2v conversion tool

I am trying to use the virt-v2v tool in CentOS for the conversion of virtual to virtual and eventually physical to virtual machines. I am rather confused after spending a day trying to get the ...
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1answer
197 views

G-WAN 4.3.14 maxes CPU on VPS even when idle

Testing gwan_linux32-bit (4.3.14) on a Digital Ocean VPS instance results in the CPU being maxed even when there are no http requests. The VPS instance has 1 core and 512 MB, running 32 bit CentOS ...
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1answer
123 views

Linux kvm: Public bridge without the physical nic

I have a VM host on the internet with my own subnet. I intended to use bridged networking and simply add my one physical NIC to the bridge and be done. But that had several downsides, not the least of ...
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1answer
115 views

How to mount a URL as a CD-ROM on QEMU?

I'm wondering if it's possible to specify a URL for the cdrom option on QEMU, and if so how would I go about doing that? Normally I'd mount an iso like this: <disk type='file' device='cdrom'> ...
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1answer
584 views

Is it useful to deploy OpenStack to a single node?

Due to several limitations and only few and expensive offers of Windows-based dedicated servers, I thought about renting a Linux server instead and running even multiple VMs on that server. I thought ...