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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Cannot use Samsung phone from inside virtual machine

The same phone will work perfectly fine on a machine running native Windows, but things simply do not work when passing the device through to a virtual machine. I installed the drivers as usual, but ...
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14 views

Preparing a Ubuntu install for sharing

I have a virtual version of Ubuntu running in VirtualBox. Currently I have lots of personal information in it. I want to share the virtual image disk with other developers, but I don't want them to be ...
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25 views

Guest OS resolution (text too small) in vmware workstation 12 player

I have a windows 10 host OS where I have installed vmware workstation 12 player. I have an Xubuntu as a guest OS (virtual machine). The complication is: the text is too small in guest OS and almost ...
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2answers
131 views

Accidentally removed a libvirt image file, can I recreate it?

I accidentally removed the wrong image file in my /var/lib/libvirt/images directory. I'm not sure how to recreate one or to undo my removal. Any hints?
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6 views

Virtual to Cloud Migration [closed]

I have been assigned a task for the migration of Virtual Servers (Linux) to Cloud environment . Wanted to ask is V2C different from V2V migration. I am talking about RHEL 6 Servers hosted over an ESX ....
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1answer
28 views

Can't login after editing /etc/security/limits.conf

After edited the /etc/security/limits.conf file to set the nofile parameter to unlimited, server got hanged . Can't login in via ssh. Tried to take console, issue with console. Will reboot of the VM ...
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1answer
17 views

VirtualBox Host - Ram Question - Mem Free Vs Mem Available - Possible Mem Leak?

I'm wondering if our system has lots of free RAM, or if its almost out. I read here regarding MemAvailable but I am wondering how it applies to VirtualBox as I am sure thats the reason the numbers I ...
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1answer
21 views

Why is it taking so long to establish a LAN connection on boot?

I have an issue with a virtual machine taking time to connect to the local network on boot. I create a virtual machine using the following command: virt-install \ --connect qemu:///system \ -...
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1answer
21 views

Clone disk of a running VM and run it on VirtualBox

I'm in the following situation: I need to "clone" the disks (sda, sdb) of a running CentOS VM over SSH (i did this step by following this guide) and deploy them on something like VirtualBox. I tried,...
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22 views

Not sure which audio device to pass through via OVMF

I'm configuring a VGA passthrough on Arch for a virtual Windows machine, and when I use lspci | grep Audio, I get two different devices with different PCI IDs. They look very similar, and I'm not sure ...
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32 views

Is there a more efficient way of defragmenting Linux memory other than rebooting?

I am running Gentoo Linux with kernel 4.4.8-hardened-r1, QEMU-KVM version 2.5.1 and 3227 MB of system-visible RAM (without considering RAM taken by BIOS and my AMD APU's graphics). I have a VM that ...
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0answers
16 views

Fedora Host, Kali VM, KVM/QEMU mouse not working

I have a Fedora 23 host, and I tried to install Kali Linux using Virtual Machine Manager, and every time I did it -- no matter how I configured it -- the mouse would not work. It would only go down ...
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22 views

Is there a way to make faster QEMU snapshots without using libvirt?

I have a Lenovo ThinkPad T430 running Red Hat Enterprise Linux 6.7, kernel 2.6.32 and QEMU-KVM 0.12.1 (per corporate policy I am not allowed to run a more cutting-edge distribution or any more recent ...
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0answers
29 views

QEMU/KVM: USB3 passthrough to FreeBSD

I'm making my first steps in FreeBSD, so please excuse any possible "linuxism". My goal is to run FreeBSD 10.2 inside virtual machine with QEMU/KVM and allow USB3 network card passthrough from the ...
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0answers
52 views

Windows 10 vs. Mac OS as a hypervisor [closed]

I am a developer working with GNU/Linux. However I am required by my workplace to have either a Macbook running OSX, or an a Lenovo running Windows 10 as my work-station. The sole use for those will ...
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47 views

Enable “kvm=off”, “x-vga=on” and “-vga=none” from within Virt-Manager?

I have virtual machine created from Virt-manager, it's Windows. I have attached host PCI device (GPU) to the guest VM, it's recognized, but not used I know options x-vga=on and -vga=none are friends ...
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1answer
39 views

How to configure internet on old linux VM

I have downloaded the first version of Mendrake running kernel 2.0.35 for study purposes. I installed the system on a virtual machine (VirtualBox), i used SCSI virtual hard drive for compatibility &...
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34 views

Access tomcat server on a virtual machine

I'm having this problem, I think it's a very basic problem, many things sound similar, but still I couldn't find the answer: My laptop has windows 10, I install VM Ware and created a virtual machine, ...
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2answers
53 views

libvirt: command to start up all guest virtual machines which have auto-start enabled

I'm using Debian Jessie as a virtual machine host using libvirt/qemu/kvm. I've set some of the guest virtual machines to automatically start when the host OS boots up, this is working fine. For ...
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1answer
26 views

Install Linux to SSD or HDD for virtualizing Windows with QEMU?

In my PC I have 1 TB slow HDD and 120 GB fast SSD. I am curious which one of my drives should be used for Ubuntu installation. I plan to use Windows without dual-boot - by virtualizing it with QEMU (...
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1answer
36 views

Is it possible to p2v a standalone linux system for VMware workstation?

I have a Linux (Fedora 23) box which has among other things VMware workstation installed. I'd like to create a virtual clone of the physical Linux box, so I can run it in VMware workstation in order ...
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15 views

PCI passthrough device memory access incorrect

I have a wrlinux yocto system running on Intel Haswell processor. Here we pass through a PCIe device(broadcom switch) to VM launched using qemu/kvm. The Guest is able to detect the device via config ...
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1answer
32 views

Share a folder between Linux host and Windows guest VM

I'm trying to share a folder between my main OS (openSUSE 42.1) to a guest Windows 7 virtual machine, but I'm unable to set it up properly. I access the VM from virt-manager, and I've read that the ...
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24 views

Converting A Physical Ubuntu Server with boot raid 1 to a Xen domu

So here's the situation: 1 physical server running a very outdated version of ubuntu 14.04 Booting off of a a software raid 1 configured in the installation. This server runs mission critical ...
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38 views

Virtual Machine failover with KVM [closed]

I'm trying failover of VM's in KVM Linux as a learning program. Scenario: 2 HV Bare metal (2 physical servers) having CentOS with KVM. On both the HV there are multiple web-server with guest ...
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1answer
21 views

Moving VirtualBox disks to cloud services

Currently, the official way of deploying a custom distribution or different operating system on Linode is installing it locally in a virtual machine and copying the resulting disk verbatim to a Linode ...
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26 views

Install CentOS 6.2 GUI with XenServer 6.5

This is my first time to use XenServer 6.5. I want to add a CentOS 6.2 Virtual Machine into my XenServer. I put the CentOS 6.2 iso and added > vnc in boot parameter. Below are the screenshot: After ...
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2answers
102 views

How do I compile my Gentoo kernel for AMD IOMMU?

I have an AMD A4-5300 CPU with a motherboard that supports IOMMU and I am trying to enable IOMMU on my Gentoo Hardened 4.3.3-r4 kernel with the intention of using a graphics card on a KVM VM. ...
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2answers
19 views

Proper way distribute several scientific experiments across multiple servers?

In case I have 8 powerful machines, what is the proper way to distribute and balance the load from user applications and scientific experiments? Is virtualization right way to go, or is there any ...
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34 views

VMware Mac OS X 10.11 on Ubuntu Shared Connection Problem

I've just installed Mac OS X El Capitan 10.11 on my Ubuntu host pc and I cannot connect to the Internet, when I go to settings in Mac OS it just displays no ethernet connection is found. How can I ...
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27 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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1answer
32 views

Proxmox hook for VMs

We have Proxmox installation. We want to execute a command after new VM was added. It is required for QEMU port redirection since setting redir option is not avaialble on GUI: qm set 102 -args "--...
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30 views

Access to disk partitions from QEMU

I have two OSes installed on my hard drive - Windows and Linux. These are setup in a dual-boot configuration. The hard drive uses GPT and UEFI. I'm looking for a way to grant QEMU (in Linux) access ...
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2answers
32 views

upload files from remote VM without graphic interface to google drive

I would like to upload a zipped folder to my google drive. The file is large and takes a long time to download to my local machine and even longer to upload it to drive. I was hoping to save some ...
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1answer
141 views

Bridged networking problem with Xen 4.6 and Ubuntu 16.04

I'm trying to setup a Xen virtualization on Ubuntu 16.04, and Xen 4.6. My plan is to have 1 private network, as well as virtual servers with public IP addresses which should be accessible externally (...
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1answer
38 views

can't find running process which I started via SSH yesterday

Yesterday I connected to my Developer VM Debian Linux via SSH. I started "Mamute" which is a open source stackoverflow clone etc. As I restarted my machine today I reconnected as root and wanted to ...
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43 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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1answer
20 views

How to use a ks.cfg file to create a virtual machine.

I'm studying for the RHCSA exam and both practice exams i'm using have asked me to do this. The question is "Use the ks.cfg file provided to create a virtual machine with hostname blah blah and with ...
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1answer
295 views

Too many rcuos and rcuob processes in my VM

I am running CentOS 7.2 (3.10.0-327.18.2.el7.x86_64) as VMware guest with 2 cpu and 6 GB RAM on my Lenevo W540 iCore 7 having 32 GB RAM. I see 128 processes each for rcuos and rcuob in my VM. This ...
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0answers
17 views

Create an inetrface to two virtual machines

I have two ubuntu virtual machines running on my computer. I want to design an application that provides me with a window via which I can communicate with both machines without having to use the ...
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47 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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2answers
37 views

How to Install VirtualBox Client Extentions in Debian Virtual Machine

I have been struggling to install VirtualBox Client Extentions in a Debian Virtual Machine (Debian 7 & Debian 8), I found the solution yet again buried in a Post group. I did not figured out the ...
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1answer
239 views

Creating new SLES 12 VM on XenServer 6.5 fails

When I try to create a new SLES 12 VM on a XenServer 6.5 host it fails with this error message: "Failed","Starting VM 'AAEB-PUBLIC218LY' Internal error: xenopsd internal error: VM = 4d956449-...
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2answers
35 views

VirtualBox Ubuntu on Windows XP host

I am attempting to make some installations on the Ubunto VirtualBox, running in a Windows XP host. The installation seems to work, I can successfully install programs using sudo apt-get install XXX ...
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1answer
25 views

Pre-built developer ubuntu VM

I'm searching for a Ubuntu (or other Linux distribution) VM with pre-installed Maven, JDK, Code-Editor, etc. It's pretty annoying to install all these tools every time you set up a new development ...
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97 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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0answers
40 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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1answer
54 views

'yum' is not recognized as an internal or external command, operable program or batch file [closed]

I installed CentOS 7 minimal on VirtualBox; when I type: yum install net-tools I get this error: 'yum' is not recognized as an internal or external command, operable program or batch file.
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76 views

an error occurred while mounting /

I have a trouble with virtual Ubuntu image launched on Oracle VM VirtualBox. After last reboot I can't manage to run it, because I'm getting on start message: EXT4-fs (sda1): Couldn't remount RDWR ...
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0answers
58 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 ...