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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Number of CPU cores versus frequency of cores in Qemu/Openbox

I plan to build a workstation mainly for running virtual machines. There will be dozens of virtual machines and they do not execute computationally expensive tasks. I will use mainly Qemu as an ...
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1answer
560 views

Can't boot properly after moving all files off then back on my VM drive

I have created an Ubuntu 12.04 32-bit VM in VirtualBox with a .vdi disk. I then mount this disk with qemu-nbd and move all the files off it; then back onto it. When I boot the VM again I get varying ...
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1answer
1k views

docker - how to run x desktop in a container?

I'm trying to set up my Linux machine to run multiple guest OSes, one of those being a Windows VM, and another a Linux container. The goal here is to prevent me from messing up the host system, while ...
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4answers
17k views

Oh no! Something went wrong! Installing kali linux

I am trying to install a virtual machine running Kali (Formerly backtrack) 1.0.7 in 64 bit. My host machine is a 64 bit MacBook pro running 10.7.5. I am using Oracle VirtualBox version 4.3.12. The ...
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2answers
97 views

Failed to load VMMR0.r0 (VERR_VMM_BUT_AC_CLEAR)

I get this error on my mac when I'm trying to boot up any virtual machine on virtual box on my new MacOS X Yosemite Failed to load VMMR0.r0 (VERR_VMM_BUT_AC_CLEAR) Result Code: ...
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11answers
18k views

Easy way to determine virtualization technology

I have command line access to a Linux machine which may or may not be virtualized. I want to determine what kind of virtualization technology it runs on, if any (VMWare, VirtualBox, KVM, OpenVZ, Xen, ...
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1answer
23 views

How to connect from one VM Guest instance to another to another VM Guest instance

I have Windows 7 as my Host OS and I have a VM guest instance of CentOs 6, now I have created a more Instance guest Centos 6 via Vagrant. All are working fine and I am able to do a ssh/ping from ...
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21 views

How to run Windows with GPU virtualization?

A year ago I switched to Ubuntu for my primary OS, which has worked out just fine. Every now and then I want to play computer games and while using Wine often works, I can't get all of the games that ...
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7 views

switch tty in Gnome Boxes

I have installed Fedora in Gnome Boxes but I don't know how to switch to tty. Second problem is I cannot input password in login prompt. Please help
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297 views

Keyboard doesn't working in boot menu on VirtualBox

I've just trying use CentOS 6.5 LiveCD on VirtualBox but all my attempts fail. When the system starts I see "Automatic boot in 10 sec ..." - if I do nothing, the message disappears after 10 seconds ...
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0answers
15 views

Separation between the User machine and Server machine by another linux for monitoring

I am planning to have three virtual machines with virtual box (m1, m2,m3). I already installed on m1 = Windows XP Home Edition, and on m2 = LUbuntu 15. The big picture is this : m1 : a user m2 : ...
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1answer
1k views

One host, two virtual machines that cannot ping each other. How to solve

We have Virtual Machines operating within the KVM environment. We setup one as a dev server running Apache etc., and the other as a Windows development environment. The two environments are setup ...
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1answer
1k views

Problem runing vmPlayer on fedora 21

First of all: Hello :) And then: After install the program and execute vmPlayer request the kernel headers to recompile it (I guess), after that vmP install the virtual network device, at this point ...
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0answers
18 views

mass_dns: warning: Unable to determine any DNS servers. Reverse DNS is disabled

I'm using UBUNTU 14.04 as virtual machine on windows using VMWARE , after logging i installed nmap but after trying to run nmap -sP 10.42.0.0 i get the following message mass_dns: warning: ...
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38 views

QEMU doesn't boot iso file in UEFI

The Problem I would like to run a Windows 8.1 iso inside QEMU KVM. For this I have downloaded the necessary OVMF files (from here). I could successfully booted a Windows 10 in UEFI mode, but with the ...
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3answers
2k views

Having issues installing Kali Linux in Virtualbox

Trying to install Kali Linux in VB and it freezes. I believe I have the correct version and a good ISO because it comes up and allows me to navigate to "install" Once I press enter, all that happens ...
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0answers
27 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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3answers
654 views

running qemu on Fedora20

With Fedora20 and built from sources qemu-2.1.1, I'm experiencing issues to run qemu with non-root privileges: % qemu-system-x86_64 -hda vdisk.img -m 512M -netdev ...
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1answer
41 views

Setting up MEAN webserver in Ubuntu 14.04 vm

I'm new to the world of web servers. My lab gave me a url with a Ubuntu 14.04 virtual machine. I sorted out enough of what I needed to do to SSH in, install all relevant libraries, and clone my code ...
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67 views

VirtualBox problems since Windows 10 update

I've been having so many different errors with Virtualbox, one after another, since I installed Windows 10, that I don't know where to start. I usually use the latest Linux Mint KDE, 64 bit, but ...
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1answer
13k views

Linux LXC vs FreeBSD jail

Are there any notable differences between LXC (Linux containers) and FreeBSD's jails in terms of security, stability & performance? On first look, both approaches look very similar.
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1answer
25 views

why does my Ubuntu Virtual Machine slow down after a number of searches, and builds?

I recently learned that my Ubuntu Linux file system may cache the result of some commands such as searches, sorts, and perhaps build commands such as make. I run Ubuntu in a VM, and although I have ...
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0answers
7 views

Add new HDD to Azure VM and set RAID 0

I need to attach some HDD to my Ubuntu Azure VM and enable RAID 0 for them to improve the performance. The new storage space will be under /home director (for storing my host data). I have some data ...
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2answers
606 views

Nested virtualization: run RHEVH inside KVM

I have laptop with 16GB RAM, trying to install Red Hat Enterprise Virtualization Hypervizor 3.3 on Virtual Machine Manager (KVM) based Guest, but it gives error "Virtualization Hardware not found" ? ...
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1answer
905 views

Any better alternative to chroot on an OpenVZ VPS?

Are there any better alternative to chroot environment? I'm thinking about running nginx on a jailed environment. BTW, I'm on OpenVZ VPS, so modifying the Kernel is a no-no. (I think that prevents ...
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2answers
874 views

Linux guest VM on mac host - Keyboard

I use a Mac as a development box, but am slowly transitioning to Linux. So I am spending the majority of my time in the Linux guest VM while working. But I still spend a fair amount of time in Mac ...
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1answer
330 views

How to mount VMware-tools cdrom inside a VM

I know this should be easy, but I'm having a hell of a time figuring out where the vmware tools cdrom is (for instance it's not /dev/cdrom) and so I can't figure out how to mount it. I'm on Kali ...
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1answer
2k views

kvm virtual manager connection failed

I installed kvm package in the centos7 i am getting this problem how to solve this. full error is here Unable to connect to libvirt. no connection driver available for qemu:///system Libvirt URI ...
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48 views

Xen ERROR Couldn't find xen kernel for Ubuntu tree

xen-4.2 running on server with multiple CentOS running guest, But when i am trying to install Ubuntu i got following error. How do i install Ubuntu on CentOS Xen Server? [root@example ~]# ...
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1answer
48 views

Start a kvm virtual machine fullscreen on boot

How can I start a Windows virtual machine in kvm on boot in fullscreen mode, in a way that the fact that Windows is running virtualized is completely hidden from the windows user ? Basically after ...
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3answers
1k views

Linux / JVM - OutOfMemoryError: unable to create new native thread

I have a memory problem with a Linux server (CentOS). It is a VM. Below is the context. It has 70Gb of RAM. There are 2 tomcat running on it. One tomcat is given a heap of 13Gb and the other one a ...
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1answer
32 views

Iptables rule to drop packets to and from local network

I want to set a virtual machine on laptop, but I don't trust the guest system fully, so I would like to block it's access to local network (to network 192.168.0.1/16 or 10.0.0.1/8 or ... the other one ...
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1answer
1k views

How to migrate from Proxmox to VMWare?

I am wondering how it is possible to migrate a full hardware VM in Proxmox (qemu) to a full hardware VM in VMWare (vmdk). I have been searching all over the place, and it seems almost impossible to ...
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1answer
149 views

GParted LiveCD fails to start

I have a VM setup in VirtualBox (LinuxMint 17.1). But I'm trying to boot to GParted so I can resize a partition. I'm using gparted-live-0.22.0-2-amd64.iso and it boots correctly. I've tried every ...
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1answer
41 views

ssh over unix pipe or pty device [closed]

Ok, I don't even know how to put this into words. I have a /dev/myDevice which automatically connects to some ssh server when opened. How do I connect to it with ssh? Is this even sane? If it's insane ...
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0answers
36 views

where to compress=lzo, btrfs with virtual disk images, with their vm's internally using btrfs

I've been using compress=lzo on my btrfs volumes, because I read this fast compression method actually increases drive performance. (Haven't tested myself.) I'm starting to use ...
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1answer
48 views

Time is not synchronized in Linux VM

I am using one Linux VM through VNC viewer from my Windows machine. What I am seeing is that time between two is not synchronized, it seems that VM is somewhat 5 minutes delayed from Windows(windows ...
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3answers
729 views

NFS server on qemu guest

I need to know how I can mount block devices, placed on a qemu guest system, from host. So in this case we have NFS server placed on guest system and NFS client on the host's side. There are a lot ...
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1answer
43 views

Create new physical volume using lvm

I have Linux Mint 17.2 codename Rafaela running as a virtual machine with a disk size of 30GB. I used the default LVM installation. I would like now to create a physical volume /dev/drbd0 to use it in ...
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1answer
50 views

virsh and creating storage pools - What is sourcepath “- - - -”

I am running CentOS 7 and was following a chapter in a book dealing with virtualization and creating storage pools. I successfully ran the following command, but I'm not sure what setting - - - - as ...
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2answers
901 views

What do the processes inside a Docker container look like?

I've heard confusion come up several times recently around what a Docker container is, and more specifically what's going on inside, with respect to commands & processes that I invoke while inside ...
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1answer
30 views

Is it possible to run a Linux distro within a VM on Qubes OS?

In particular, I am considering running a minimal distro (maybe ttylinux) within Qubes. I understand that Qubes can run each OS component and application within a separate VM but how about an entire ...
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0answers
34 views

Is it possible to install Xen on a computer (processor supports virtualization) alongside Ubuntu and Windows?

The computer currently triple boots Ubuntu and a couple of Windows versions. Now I want to add Xen into the mix. Would it work if I simply made a new partition for Xen, or does it need to take over ...
0
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1answer
48 views

Check if Ubuntu is being installed in VirtualBox VM

I am trying to automate the installation of Ubuntu from a network repository. I am now successfully able to configure the ISO image and it does the installation automatically. My requirement: I ...
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1answer
18 views

What things should be kept in mind while assigning static IP addresses to Virtual Machines

I always face problems pinging the base machine whenever I assign statics IPs to VMs. I also don't understand what gateway IP should I give,to connect to the internet or just to be able ping the Base ...
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1answer
80 views

Virtual USB HID device

I'm developing an application that will communicate with attached USB HID device. The problem is that there is no real device yet (it is under development by another part of our team), so, I'd really ...
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0answers
16 views

Qemu overlay image size limit

I created a qemu ubuntu vm. Now I use overlay images as a quick way of creating vm's "on the fly". But what is the size limit for an overlay image? Is it the size of the "base" image? Or can it grow ...
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62 views

Using raw physical hard disk in virtual machine, with smart capability and true model number seen

Is it possible to add an entire physical hard disk to a VM, and inside the VM see the hard disk for what it truly is? In VMware Workstation 11.1, if I add a hard disk choosing SCSI, with "Use a ...
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1answer
20 views

Laptop doesn' t want to wake up

My laptop (Notebook HP Pavilion g7t-1100 CTO) have been working fine till today, I enabled Virtual Technology in BIOS and from that time laptop doesn't want to wake up after I slept it. When I disable ...
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0answers
109 views

OpenVZ fails Container creating (Unable to get appcache tarball name for ve-basic.conf-sample with ostemplate debian-7.0-x86-minimal)

I have OpenVZ installed on CentOS 7.1. After I execute vzctl create 101 --ostemplate debian-7.0-x86-minimal I get command /usr/sbin/vzpkg exited with error 8 Unable to get appcache tarball name ...