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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392 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 $...
0
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1answer
57 views

Running a Linux distro on a VM on a USB drive

I apologize if this isn't quite the right place to pose this question, but I couldn't find a more appropriate stackexchange site to ask this question. My goal is to have my USB drive loaded with a ...
2
votes
1answer
175 views

how do I create an appropriate drive for a libvirt virtual machine?

I am trying to use virt-install to create a CentOS 7 virtual machine in a CentOS 7 host. Towards that end, I have been reading the virt-install documentation at the RHEL web site, and I have also ...
1
vote
1answer
735 views

How to use Vagrant provisioning to install a package without download?

The title says it all. I'm using Vagrant boxes for several purposes, and in most cases the prepared boxes I can download are totally sufficient. However, sometimes I need one or a few additional ...
0
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0answers
37 views

how do I virt-install a guest from a dvd?

On a CentOS 7 host server, I would like to create a guest virtual machine with CentOS 7 as the guest operating system. I have a CentOS 7 installation DVD that was burned from an iso file in windows, ...
0
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2answers
482 views

Unable to connect to Linux VM from Windows 7 Desktop

ssh destination: --VM : Oracle VM Virtual Box 4.3.20 --Linux installed on VM: Fedora 22 (IP: 10.0.2.15 ) ssh source: --Windows 7 Desktop I installed putty on Windows 7 Desktop and am trying ...
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2answers
994 views

yum No package VirtualBox-5.0 available. on a MINIMAL installation of CentOS 7?

I have tried many tutorials that give explicit steps for installing VirtualBox on CentOS 7, but none of them go to completion without throwing errors. Some of the tutorials assume that you will ...
0
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1answer
1k views

service vboxdrv setup throwing error when installing VirtualBox on CentOS 7

I am trying to install VirtualBox 5.0 on a minimal (terminal only) CentOS 7 server, but I keep getting the following error when I type service vboxdrv setup: The service command supports only basic ...
0
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1answer
22 views

How should I test installation procedure on clean system (quickly and disk-space cheap)?

I was asked to invent an installation procedure for existing application, including compilation, downloading and installing the server and some other things. I have managed to get the program to work ...
17
votes
2answers
1k views

Is developing/testing a linux module safe using a virtual machine?

I'm in an operating systems class. Coming up, we have to do some work modifying kernel code. We have been advised not to use personal machines to test (I suppose this means install it) as we could ...
1
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1answer
100 views

Why isn't VBoxManage booting from DVD?

I am trying to use VBoxManage to create and manage CentOS 7 virtual machines on a CentOS 7 server. The commands below first result in the following conflicting statements: 1.) that the virtual ...
1
vote
1answer
52 views

Thoughts on security in linux [closed]

So ransomware is around again - at least in Denmark. This is a major issue for MS-Windows users, but does almost never affect Linux or Mac. The reason is an issue of debate. But since the consumer ...
0
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1answer
121 views

How to view all users and change the password

What I have done is set up a virtual machine using AQEMU/KVM of Kali Linux, the problem is that I don't remember either of my log in details user name / password. So, is there a way to view those ...
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0answers
32 views

Error installing Zoiper in CentOS virtual machine

I'm trying to install zoiper on my CentOS virtual machine but when I finish installing it, this pops up and zoiper terminates:
0
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2answers
57 views

Allow multiple local servers to share a local domain

I'm wanting to set up multiple local servers in VMWare. For example, one web server, one file server, one openvpn server, etc. I would like to create a domain that works locally (e.g. example....
1
vote
4answers
950 views

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

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(with KVM ...
2
votes
1answer
300 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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0answers
119 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 ...
0
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0answers
33 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
1
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0answers
23 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 : ...
0
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0answers
817 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: ...
0
votes
2answers
260 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: NS_ERROR_FAILURE(...
0
votes
1answer
135 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 ...
2
votes
0answers
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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0answers
30 views

Add new HDD to Azure VM and set RAID 0

I need to attach some hard drives 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 ...
0
votes
1answer
101 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
245 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 can successfully boot a Windows 10 in UEFI mode, but with the ...
1
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1answer
793 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 ...
3
votes
1answer
91 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 ...
0
votes
1answer
80 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 ...
0
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0answers
265 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 kvm/libvirt/...
2
votes
1answer
164 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 the VM is about 5 minutes delayed from Windows (windows ...
1
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1answer
143 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 ...
0
votes
1answer
623 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 ...
25
votes
2answers
4k 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 ...
0
votes
1answer
236 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 ...
0
votes
1answer
165 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 ...
-1
votes
1answer
206 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 ...
0
votes
1answer
30 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 ...
4
votes
1answer
414 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 ...
0
votes
0answers
38 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 ...
1
vote
0answers
238 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 ...
0
votes
0answers
149 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 ...
0
votes
1answer
40 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 ...
0
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0answers
77 views

Turn .vmwarevm into .iso

I was wondering if anyone knows how to take the .vmwarevm and the files inside it and turn it into an .iso. I searched on Google but haven't found anything. It would be amazing if the .iso can ...
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0answers
101 views

Gnome-boxes not able to see virtual machines after sleep

I am having a bit of trouble to solve this issue. I am using gnome-boxes to run my windows boxes for my school project purpose. When I boot the system, everything works just fine When I type : ...
0
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2answers
494 views

Send network traffic via a Windows VM on the same host to use corporate vpn?

At work we have a VPN solution that will only work on windows. I personally do not run Windows at home and run Linux (Ubuntu 14.04). I used Virtual Box to setup a Windows 7 virtual machine to run ...
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0answers
266 views

how do I mount an external hard drive connected via SATA Wire to CentOS 7

I have CentOS 7 installed as a guest OS inside VirtualBox running on a Windows 8.1 machine. There is a SATA Wire connecting the machine to an external hard drive that used to contain a dual boot ...
0
votes
1answer
821 views

enabling vnc after using virt-install

I've created a virtual machine using virt-install with graphics --none. I want to enable vnc. I've tried virsh -c qemu:///system qemu-monitor-command vm171-SC-1 --hmp change vnc :3 but it doesn't ...
0
votes
1answer
39 views

Disk mount on a linux VM , mounted elsewhere

Hi I am using a slightly unnecessary(maybe?) kind of a set up ... A debian build_VM The build_VM ran out of space so I formatted and mounted a disk on to the build_VM But before mounting the ...