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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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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17 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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12 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So here's the situation: 1 physical server running a very outdated version of ubuntu 14.04 Booting off of a a software raid 1 configured in the installation.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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27 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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17 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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18 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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1answer
49 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
17 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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27 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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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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1answer
18 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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25 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
21 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
80 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
32 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
18 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
120 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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16 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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38 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
29 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
231 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
32 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
18 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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57 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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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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48 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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65 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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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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0answers
51 views

Resize Partition for dev/sda3 [closed]

I am trying to learn Linux. I have Linux-based server on which an Oracle Application running. This is a Virtual Machine and a single VHDx file. Now I want to extend /dev/sda3 as its current available ...
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1answer
27 views

Docker container on Red Hat Linux server 5.9

Can I install Docker on Red Hat server 5.9 so I can take an image container from an installed software and move it to another server? Or should it be enough to update the Kernel up to version 3 so ...
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1answer
56 views

What is the network connection speed between two containers communicating via a virtual bridge running on the same host?

Does a virtual bridge (added to /etc/network/interfaces) limit the transfer speed of data from the memory of one lxc/docker container to another? For example does the memory throughput drop to that ...
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1answer
201 views

Arch linux ( kvm/qemu virtualization ) failed to open libiscsi.so.4

I have fallowed the steps from Arch Linux #KVM and #qemu 1) sudo pacman -S then installed libs libvirt libiscsi libaio qemu qemu-arch-extra qemu-block-iscsi qemu-block-rbd qemu-block-gluster ...
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1answer
88 views

How to enable IOMMU on Gigabyte GA-970-Gaming SLI-CF

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=4965005e-54e9-47b9-92ff-...
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1answer
24 views

How do I configure VirtualBox snapshots running server processes to restore correctly?

I'm running VirtualBox 5.0.20 on an OS X host. There's a variety of guest systems, including Ubuntu, CentOS, Windows and OS X. For each of these systems, I created a live snapshot (i.e. while the VM ...
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37 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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1answer
28 views

How to SFTP into a KVM VM on remote RHEL 7.2 server?

We have a RHEL 7.2 server which runs a virtual RHEL 7.2 machine on KVM. The only way to connect to this VM is to SSH to the server and then SSH again to the VM, using a user on server. How can I ...
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30 views

Install IOTOP/IOSTAT via ZYPPER (or anything else) on a SUSE (SLES) 12 Virual Machine (HyperV)

I have a virtual machine hosted on HyperV. It is a SUSE Enterprise 12 OS residing in a rack somewhere in the dark side of our office. This machine is under-performing during a certain load that takes ...
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1answer
23 views

After installing Ubuntu, partitions do not match mounted directories

I installed an Ubuntu server in a virtual machine. What I really don't understand is the differences between parted and the mounted file system. I allocated a 100GB disk in vmware and it seems to be ...
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1answer
67 views

How to install OS in virt-manager in kali linux v2.0

I have installed Kali Linux in Laptop. Now I have installed virt-manager in Kali. But while installing "fedora 22" in virtual machine it crashes. Below are some command output: service libvirtd ...
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18 views

Qemu/KVM, windows guest password prompt

Ubuntu 16.04 Qemu/KVM Windows 8.1 guest SSH from remote host into hypervisor, run virt-manager. Get prompted for creds: user1@hypervisor, authenticate successfully. Open guest, get prompted for ...
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1answer
33 views

Unix Domain Socket with VM

Is it a true statement that, shared memory does not work between a host OS and guest OS, but a Unix Domain Socket (specifically udp) can communicate between the two? An in depth explanation would be ...
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0answers
23 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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1answer
31 views

Can’t build and start docker container with mariadb

Host OS: Ubuntu 16.04 x86_64 Docker OS: Alpine Linux Edge Docker version: 1.11.0, build 4dc5990 MariaDB version: 10.1.13 I try to install MariaDB via Dockerfile and start it on entrypoint (...
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1answer
55 views

Execute command inside guest vm Libvirt

Is it possible to execute a command for eg:iostat inside a guest VM using libvirt or virsh .I want to find out IOPS for a guest vm but with libvirt java api I am not able to get the IOPS of a vm ,...
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39 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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21 views

VirtualBox guest (Windows 7) resets host (Slackware 13.1)

As pointed in the title I'm in a situation where a VirtualBox guest (Windows 7) resets host (Slackware 13.1). This happens when the guest (Windows) in booting up. The same happens with two virtual ...
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52 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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1answer
38 views

How to fix connection loss in VM?

My virtual machine loses the internet connection sometimes on linux and I need to stay connected constantly. So I wrote the following script: #!/bin/bash wget -q --tries=10 --timeout=20 --spider ...
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1answer
21 views

Can't boot TAILS virtual nachine

I've downloaded TAILS and when I boot everything goes normally until it fully boots up, at which point it shows the desktop for a second and then says "Uh Oh! An error has occured" or something ...