A virtual machine (VM) is a guest Operating System running in a completely isolated environment within a normal host operating system. Modern virtual machines are implemented with either software emulation or hardware virtualization or (in most cases) both together.

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How to setup unprivileged LXC container without reboot?

I am writing some bootstrapping scripts, and I can't get usermode LXC containers working on vanilla Ubuntu 14.04 headless without a reboot. Here is what i do. First, I download and install Ubuntu ...
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42 views

Getting a Windows 7 installation to run virtualized under Ubuntu?

I've currently installed Windows 7 and Ubuntu via dualboot. To avoid switching the OS by rebooting, i want to be able to start my Windows 7 via a virtual machine. It is important to be able to boot ...
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82 views

Virtualization (KVM) and excessive cached RAM

I've set up a virtual machine through KVM-libvirt (virt-manager) with Windows 10 on it and I'm getting an odd behavior on the host side. I'm running a 64bit Arch host with 24GB of RAM, 12 of which are ...
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355 views

Migrate a qcow2 image between storage pools

I have 2 storage pools. host_images (directory storage pool) remote_images (nfs storage pool) How do I copy qcow images from remote_images to host_images using libvirt APIs? I've tried using the ...
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2k views

PCI passthrough with Xen

I am trying to run Windows XP in a Xen DomU virtual machine with a PCIe device, for which there are no Linux drivers, being passed through from a Debian Squeeze Dom0. My hardware supports ...
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302 views

Setup Cloudmin on Centos installed in LVM

I installed CentOS 6 with default LVM partition pattern. according to this pattern Can I use Cloudmin and store KVM Disks in LVM as Logical Volume? I think Cloudmin requires creating new logical ...
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39 views

fedora 22 filesharing problem with virt-manager and Windows 7 guest

I'm running Fedora 22 (64 bit, 16gb memory, ext4 boot disk) with a cinnamon desktop and I would like to use Virtual Machine Manager to run Windows 7 as a guest. However, I'm having trouble ...
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54 views

Virsh (libvirt-bin) is not able to communicate with Xen server

I have installed the latest version of Xen server 6.5. Now I want to connect to it with virsh (libvirt-bin). When I do this I get the error error:end of file while reading data: sh:nc:command not ...
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47 views

Change with the command iptables not reflected in the output of the command netstat

Scenario: A virtual machine UU (abbrev for Ubuntu) is serving a web-page. The web-page is accessible on CO (abbrev. for CentOS) which has the Virtual Box on which UU is running. However the web-page ...
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66 views

Setting umask of libvirt/virt-manager for proper permissions in a directory shared by host and guest

I'm attempting to create a directory that is fully available to both the host and guest systems of a virt-manager/libvirt/QEMU/KVM virtual machine, with read, write and execute permissions for non-...
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80 views

Why don't I have networking connectivity on my virtual machine?

I have a virtual machine called vnet208. I used to be able to ssh into it, but I made some changes a while ago and then we had some power outages and now I don't have network connectivity. I can get ...
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168 views

How do I ssh into a new virtual machine?

note by derobert: problem was resolved in chat, starting around http://chat.stackexchange.com/transcript/message/24666451#24666451 if someone wants to write up an answer. Turns out the bridge wasn't ...
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391 views

Virtualbox and GPU Pass-trough: Device with host PCI address already attached to this VM

I have server with several GPUs. My idea is to attach them to different VMs in order to use that VMs in CUDA (or OpenCL) calculations. My setup: CPU: Intel Xeon E5-2670 GPUs: 1 x Radeon HD 7970 $...
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147 views

How to differentiate 2 NICs with the same PCI address

I am running Fedora 22, and have a GPU that I passthrough to a KVM guest. I accomplished this by adding pci-stub.ids=<pci id 2>,<pci id 2> to my Grub boot option. The two PCI IDs I'm using ...
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98 views

Moving a whole server into docker instance (or LXC)

It seems to work, to move an existing install into a virtual machine. Is it possible to move a whole Debian server into a docker instance inside the same machine? I would like to get a docker that I ...
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209 views

Is there a way to emulate a wireless card in qemu / kvm?

Is there a way to emulate a wireless card in qemu / kvm? Or is there no point to this? Is it considered just another interface?
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199 views

virt-manager error “format=dir: 'dir' invalid format” when creating qemu VM with ISO

This is virt-manager 1.0.1 on Fedora 20. The server has libvirt 1.2.13-1, qemu 2.2.1-2 on Arch Linux. Go to File -> New Virtual Machine. Select Use ISO Image to install from then browse for it. ...
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Udev rule not working on Debian

I can detect and mount my USB drive on my Debian VM machine. And the first post here - explained below - works on my Ubuntu machine. Should not it work on Debian too? It doesn't of course. Why is that?...
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419 views

Linuxwacom xsetwacom/xorg.conf

I have a CentOS 6.2 workstation with linuxwacom 0.21.0 installed. I am trying to map a button on a cintiq tablet to a keyboard key. I can do it successfully using: xsetwacom set "Wacom Cintiq 24HD ...
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627 views

Network connectivity issue between different hosts from a network namespace in one host

I have created two Ubuntu 12.04 VMs using VMWare Player with NAT network configuration. I am able to ping them from each other. After that, I created a network namespace in one of them and add a ...
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300 views

Differences between primary and secondary VGA pass through in virtualization

Xen, and more recently KVM, allows you to pass a VGA adaptor from the host to the guest as either a primary or secondary device. Both links provide some explanation as to why passing a VGA adaptor ...
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513 views

Vagrant-lxc container not starting

Firstly I'd like to say that I'm new to LXC and I may have some problems getting the right idea of how the things should work. The thing is I'm trying to start a previously download vagrant-lxc box ...
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159 views

sharing folders in virtual box

I'm trying to run a Linux Mint guest inside a Linux Mint host(both 64-bit). I've installed Guest Additions etc. But I'm not able to access the shared folder. sudo mount -t vboxsf kernel /media/...
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In virtual machine manager, is there a way to add disk space to an existing disk?

I know that in virt-manager you can add RAM and processors to the virtual machine, but is there a way to increase the available disk space larger through the GUI? Edit: @slm was able to find the ...
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64 views

Can I use Synaptics' output in KVM?

I have been looking at MenuetOS, a simple graphical OS written entirely in FASM. The only reason I don't actually use it is that its touchpad support is pure garbage: every time I try to run MenuetOS, ...
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324 views

Network in LXC not forwading through a bridge

I've got an LXC container, on the host I've got a bridge between the LXC container and eth0. The LXC container can ping it's Host 10.1.0.5, but can't ping the gateway of 10.1.0.2. The host is able to ...
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425 views

How to manage 2 vm using upstart?

I use an upstart script to monitor a vm and respawn it when it gets killed. I would like to simulate a failover by doing the following. Create a clone of the VM1 say VM2. When either of them is ...
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751 views

Xen is unable to use URL's to install CentOS

I can't seem to use URL's when using the netinstall for CentOS, I'm installing CentOS on a Xen VPS. I keep getting this error in the terminal window, when I use the URL: ┌────────────────┤...
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152 views

VirtualBox appliance import locks up system

I have a Windows Vista x64 appliance that I am trying to import into the Open Source Edition of VirtualBox on Linux Mint 11 x86-64. The ovf file is 21.3 GB in size. The problem I am having is that ...
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18 views

FreeBSD display resolution under Veertu

I'm trying to set up FreeBSD 10.3 under Veertu. When starting X, the largest resolution I can get is 1280x720 (well, I can select 1280x768, but then I have to scroll). My actual screen is much bigger ...
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34 views

Use of virtio on QEMU without KVM

I want to write a simple driver for use inside a QEMU virtual machine, which will be communicating with the host through a respective backend special virtual device. The said driver and backend ...
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54 views

How to enable IOMMU on Gigabyte 990FXA-UD5 R5

I've enabled svm and iommu in the bios, but I get "not available" from dmesg: root@xen:~# dmesg |grep -i iommu [ 0.000000] Command line: placeholder root=UUID=0b6a99ef-b56b-4d71-9f63-4895d0276674 ...
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35 views

Long term solution to running 3D applications in a virtual machine or container

I have a complex script written a few years ago and, although it currently works, almost every time I upgrade my machine something gets broken, and maintaining it really hinders my work. It acts as a ...
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21 views

UUID of LUKS changes when cloned

I am trying to install Centos 7 (under LUKS) on a virtual machine in Fedora 23 using virt-manager and after that to clone that image to multiple USB drives. The problem is that the virtual machine ...
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38 views

Performance issues running Linux Mint on qemu-kvm - maybe run in textmode and use remote graphics for administration?

we are running virtual servers on kvm-qemu, using debian wheezy as a host system. Unfortunately one server is based on Linux Mint 17.3. One big issue is the performance of Linux Mint based on kvm. ...
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50 views

Mount storage from host in bhyve VM

Is it possible to mount storage space from the host environment inside a bhyve virtual machine? I could use a network share, but I figure there would be less overhead mounting the data directly. I'm ...
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60 views

qemu-system-arm problems adding second NIC/bridge

I am running Qemu under a host with two bridge interfaces and would simply like to bridge them to guest NICs. All of this works fine when bridging one NIC either by creating a bridge manually or using ...
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64 views

Fedora 23 Server 64-bit install fails to complete on virtual machine in Windows 10

While attempting to install Fedora SERVER from an iso: Fedora-Server-netinst-x86_64-23.iso the installation stalls completely on Creating ext4 on /dev/sda1. I am using VMware Workstation 12 Player ...
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27 views

Booting from copy of Linux directory structure

I have a folder containing the folder structure of a Linux machine from /. Is there anyway that I can boot from that folder? Ideally I would create a vmdk so I can get a virtual machine out of it. The ...
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54 views

Python installation fails in chroot

I tried to install Miniconda Python in a chroot: chroot $1 wget -q https://repo.continuum.io/miniconda/Miniconda3-3.19.0-Linux-x86_64.sh -O /tmp/miniconda.sh ...
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43 views

How does Ubuntu's indexation work on a virtual machine?

I have read on https://help.ubuntu.com/community/FindingFiles the following sentence: Thankfully my computer indexes all my files every night while I sleep and I can search just the index, which ...
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29 views

Why I can not update Linux core in dockers?

When I run apt-get update && apt-get upgrade in container, the core is not starting to update. Yes, I know, containers use the kernel of host machine and can not execute some ...
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61 views

Virtual CPU utilization(multi core CPU)- Identify the process

I am in a road block and trying to understand the below. Red hat Linux has been installed in a Intel Xeon CPU. We have a 6 core virtual CPU's. I am trying to find out which job is consuming more of ...
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11 views

Remotely use a platform device

I have a linux/android device with a certain hardware module (lets call this pc A), and a driver which uses the hardware as a platform device. Because of testing/os restrictions I'd like to be able ...
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Create Network Interface That Redirects All Traffic to Actual Interface

I would like to create a network interface on my Arch Linux host for a VM to use (probably QEMU) so I can use iptables to firewall all network traffic in/out of the VM. The interface should send all ...
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183 views

Why does NetworkManager explicitly support tun/tap devices?

Apparently NetworkManager recently gained support for macvlan interfaces. I notice it also supports macvtap, and the patch shows it already had some support for tun/tap devices. I thought tap ...
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32 views

Virtualization and SCSI passthrough

Is there a way to do SCSI passthrough in a virtualized environnement under Linux (Linux being the host OS, and MacOSX being the guest OS) ? My goal is to drive a high end scanner for which no driver ...
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24 views

Connecting a Redhat virtual machine to the host NIC that uses network bonds

I'm running Redhat 6.6 on severs with multiple interfaces. And I am successfully using network bonds on the interfaces to connect with the different VLANs on the existing network. The servers are ...
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132 views

/dev/kvm is missing from system supporting kvm-virtualization

I'm trying to enable kvm-virtualization for Android virtual devices. In order to do so, I followed this guide and did the following: Checked, if kvm-virtualization is available: user $ grep --color ...
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183 views

Running QEMU inside XEN virtual machine

Is it possible to run QEMU inside XEN virtual machine? I tried to enable the XEN nested virtualization for with following options to virtual machine configuration file in /etc/xen/vm1.cfg: hap=1 ...