Server Fault Stack Exchange
Server Fault Stack Exchange

Questions tagged [virtual-machines]

A virtual machine (VM) is a completely isolated guest operating system installation within a normal host operating system. It is a software implementation of a machine (i.e. a computer) that executes programs like a physical machine.

Modern virtual machines are implemented with either software emulation or hardware virtualization. In most cases, both are implemented together. Usually the term refers to system virtual machines which provide a complete system platform which supports the execution of a complete operating system (OS). Note that process virtual machine exist too, which are designed to run a single program (a single process).

An essential characteristic of a virtual machine is that the software running inside is limited to the resources and abstractions provided by the virtual machine—it cannot break out of its virtual environment.

2821 questions
9
votes
3 answers

VirtualBox guest network lost after host disconnects

I am running VirtualBox both on a Snow Leopard OSX host machine and on a Windows Vista host machine. Whenever my host machines lose internet connection the guest machines seem to lose internet connectivity permanently even after the host connection…
Dave Konopka
  • 193
  • 1
  • 6
9
votes
2 answers

QEMU - incorrect real disk size of a virtual drive

df and ls report different sizes on my host machine because of the difference between the allocated size and the amount of space that's actually used in the EXT4 filesystem. The problem is that both report the wrong size. qemu-img also doesn't…
user3125731
  • 347
  • 5
  • 9
8
votes
3 answers

Qemu TRIM and discard on a physical SSD device

I am running Windows 7 in a Qemu/KVM with a passed through GPU which I use for work-related stuff. I recently got fed up by it's unprecedented slowness due to it running off a mechanical drive, so I added an SSD to my box to 'give' to my…
nohupper
  • 91
  • 1
  • 1
  • 3
8
votes
2 answers

Export VM from Hyper-v as OVF

Using Windows Server 2008 R2 and Hyper-V. I'm migrating all our VMs from Hyper-V to VMWare, and in order to facilitate this I've been asked by our IT support to provide them with the VM in .ovf format. So far I've shutdown and exported the VM from…
TheOrdinaryGeek
  • 429
  • 1
  • 4
  • 13
8
votes
2 answers

Checking if two virtual machines are running on the same host

Is there a way to see if several Virtual Machines are running on the same host? Specifically, I have three VMWare VMs (each running a Ubuntu Server 14.04) and I have tried to compare different pieces of information: dmidecode -s…
ixM
  • 183
  • 2
  • 9
8
votes
1 answer

linux OOM-kill why?

. Greetings, fellow admins. I post in the hope of shedding light on the OOM-kills that haunt one of my company's machines. I cannot decide if they are legit OOMs or not. It's a Centos 6.x with kernel 2.6.32-279.1.1.el6.x86_64. Ram 8 gb, cpu…
Leo
  • 81
  • 1
  • 2
8
votes
3 answers

Backing up VirtualBox VMs

Does anyone have a good complete strategy for backing up a bunch of virtual machines running under VirtualBox? I intend to run a handful of virtual machines on a single hardware platform and back them up nightly to external disks, which will be…
James Green
  • 895
  • 1
  • 9
  • 23
8
votes
4 answers

Hardware vs software license keys in a VM environment

I am working with a vendor who is supplying a server-based application which requires licensing for activation. There are two options, software-based licensing and hardware (USB-dongle) based activation. What are the pros and cons to using hardware…
Shane Wealti
  • 431
  • 5
  • 15
8
votes
1 answer

virtual disk image - file or partition

I'm looking at the differences between using a file versus a partition to store a virtual disk image in VM use. The common knowledge is that partition-based images are faster than file-based images because of a decreased overhead. It makes sense,…
tylerl
  • 15,055
  • 7
  • 51
  • 72
8
votes
3 answers

RAID 10 or RAID 5 for multiple VMs - what is the best choice?

I have just ordered a new rig for my business. We do a lot of software development for Microsoft SharePoint and need the rig to run several virtual machines for development and test purposes. We will be using the free VMware ESXi for virtualization.…
Lars Fastrup
  • 215
  • 1
  • 3
  • 8
8
votes
4 answers

How to enable multiple virtual consoles on linux?

I'm new to linux so I have no clue how to do this (couldn't find it on the web). I'm running a LAMP Virtual Machine and when I press ALT-F2, F3 etc.. to use a Virtual Console I get a blank screen (all black to be exact) not a login option, so the…
rodrigoq
  • 183
  • 1
  • 1
  • 4
7
votes
8 answers

Virtual machine image compatibility between VMware Server and VMware Player

I'm trying to minimize the number of different product versions used on my PC's both at work and at home. So far I have a mixture of: VMware Server 1.0.7 VMware Server 2.0.2 VMware Player 2.5.3 VMware Player 3.0.0 and I would love to upgrade each…
alexandrul
  • 1,435
  • 2
  • 19
  • 25
7
votes
3 answers

VirtualBox and Windows 10: can't connect to a server hosted on VirtualBox

Not a duplicate - I searched a lot and tried to use suggestions from many articles, including answers to this question: VirtualBox: How to set up networking so both host and guest can access internet and talk to each other and this article. But in…
user64675
  • 91
  • 1
  • 2
  • 8
7
votes
2 answers

Hyper-V: Unable To Start a VM From ISO File

Recently I needed to create a new VM, and this VM needed to start from ISO file. When I mounted an ISO file and tried to boot, I’ve seen the following error: Synthetic SCSI Controller (Instance ID xxx): Failed to Power on with Error ‘The version…
HighClouder
  • 109
  • 1
  • 1
  • 7
7
votes
3 answers

How to specify user permissions for managing a Hyper-V machine on a LOCAL host?

I have UserA. Working on ComputerA. I have setup a Virtual Machine on ComputerA under Hyper-V called ComputerA-VM. ComputerA runs Windows 10 Pro. ComputerA is part of domain.com managed by a DC running Windows Server 2012 R2. UserA is a…
Daniel
  • 1,614
  • 9
  • 29
  • 47
1 2 3
…
99 100