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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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
25 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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26 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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38 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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8 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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Not able to ssh into host from KVM guest when using user mode networking(default) [migrated]

I used virtual machine manager to create a Ubuntu VM which uses default NAT based networking still using the default address 10.0.2.2 I am not able to ssh into the host, neither can I connect to VM ...
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1answer
35 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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9 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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23 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
19 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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29 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
76 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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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 ...
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14 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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10 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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37 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
35 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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12 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 ...
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1answer
30 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
76 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
57 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 ...
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52 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
58 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
81 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
52 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
54 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
39 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
30 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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20 views

How do you migrate kvm guests from virtualizor to solusvm ?

I have a server that until recently had virtualizor in standard setup (and hosted a few guests - all kvm) / 200 Gb /vg_guests - 3.4 Tb Recently i stopped and disabled virtualizor services and ...
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1answer
54 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 ...
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0answers
25 views

__ticket_spinlock high cpu

We are having a strange problem on our Ubuntu 10.04 KVM infrastructure, where periodically, one of two vm webservers freaks out, with persistently high load, even if we restart the applications. (the ...
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1answer
33 views

Tracing system calls is slow on a KVM VPS?

I run a website on a KVM VPS and I noticed that processes appear to run extremely slowly when being traced. For example, I ran ls on my home directory, which contains 72 files and directories. With ...
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1answer
64 views

Disable TCP checksum offloading on KVM virtual network

I have a virtual network for connecting KVM guests with the host. I need to disable TCP checksum offloading on this network. The ethtool works fine but I want to disable it permanently and I could ...
1
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1answer
54 views

bad page map bug during snapshot

I ran the following command to create a snapshot volume. But the kernel received a bug and the kvm hypervisor stopped responding. Why is the error and how to fix it? lvcreate -L20G -s -n ...
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23 views

KVM: RAM Usage vs. actual consumption on VPS [duplicate]

My VPS hoster is worrying about me consuming more than booked as guaranteed RAM. My VPS is most of the time almost idle, no DB or caching in background. It's only an nginx for hosting static files of ...
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1answer
62 views

Improve Disk Performance of a Linux 2.4 Guest on KVM Host

I have a server running Linux 2.4, and I'd like to virtualize it using KVM. I can run it with a IDE controller, but my applications require more disk performance. The best existing solution is using ...
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1answer
27 views

Live migration (kvm) not working if any I/O operation is in progress [closed]

I did this experiment: on VM I started watching a video on youtube. While video was in progress I started migration. Migration did not complete until video was not finished. I did another experiment: ...
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1answer
53 views

SELinux policy issue

As qemu & KVM are working fine with SELinux out of the box I'd like to enable SELinux to improve guest isolation on my CentOS 6 server. The problem is that I'm using a 3rd parity virtualization ...
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2answers
65 views

KVM: All network traffic to one guest (firewall)

I am currently using a VMWare ESXi 5.5 server for my virtualisation. The network setup is like this: PFSense firewall is the center of it all and connected to: LAN Network (physical NIC 1 assigned by ...
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1answer
39 views

Implementing hardware virtualization for custom hardware

When using QEMU/KVM there are certain network adapters that are supported and emulated. If one wanted to emulate the guest OS's original network adapter (e.g - a Broadcom interface that was present on ...
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1answer
50 views

Retreiving the real hostname of VMs under KVM using Virsh

In KVM Support, virsh list --all lists all the domain name created and not the real host name of the VM. i.e it will list only the display name which will be specified during the creation of VMs. ...
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0answers
59 views

SSD+MDRAID+LVM+KVM results in lower performance than expected

We use kvm for virtualization, the disk images are stored as logical volumes. The logical volumes are stored on a bunch of software-RAID1 (mdadm) arrays composed of Intel DCS3500 SSDs (each array is a ...
2
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2answers
40 views

How to get SRIOV network pool with multiple PFs

For an Ubuntu 12.04 server and KVM/libvirt 1.0.0 with an Intel 82599 network chip: following these docs: ...
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0answers
36 views

Access KVM guest via hostname on private virtual network

KVM on CentOS 6.5. Setup one bridge connected to internet. And one virtual network on subnet 192.168.100.0/24 DHCP start: 192.168.100.128 DHCP end: 192.168.100.254 How to ...
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0answers
17 views

Qemu/KVM: packet queueing from/to guest

I am new to virtualization and trying to understand the pakcet path from guest to physical nic and vice-versa. I am partiaularly interested in understanding what are the various queuing points from ...
0
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1answer
20 views

How to automatically start virtual Networks using virsh?

Following this answers, configuring domains to autostart using virsh is easy; set aside they fail with following error message: error: Failed to start domain [name] error: internal error Network ...
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32 views

KVM, Ubuntu 12.04, Cloudmin and port security

In my test environment I get everything working perfectly the way I want it. Running Cloudmin KVM instances over a bridged adapter. Then when it comes time to install at the data center I hit a brick ...
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1answer
64 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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1answer
25 views

Migrate multiple LVM volumes for KVM guest to image

I want to move some KVM guests to VMWARE and therefore have to create VMDK images of the disks. The virtual disks for the guests are spread around multiple LVM volumes. There are a couple of pointers ...
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19 views

Forward connecting IP address to KVM guests

I'm running kvm with iptables configured to use DNAT and masquerading. However the guest machines are logging the host bridge ip not the connecting client IP address. Is there a way to configure ...