Stack Overflow
Stack Overflow

Questions tagged [virtual-machine]

A virtual-machine is software emulating complete computer hardware. There are various applications that supply this functionality. **Note**: For questions on the Java VM, use the specific tag [jvm], and for the Android virtual machine, use the tag [dalvik]. For other questions on implementation details of other kinds of VMs like interpreters, automata or Turing-machines, use the tag [vm-implementation]. ONLY QUESTIONS ABOUT PROGRAMMING ARE ON-TOPIC.

If you need non-programming help setting up a virtual machine, ask those questions on Server Fault or Super User.

A virtual-machine is software emulating complete computer hardware. There are various applications that supply this functionality.

The term virtual-machine can be used for a single file containing the software which emulates all the hardware. Virtual-machine software use various hardware and software tricks to speed up the running software.

Programs run on a real machine do not need to be changed to be run on a virtual machine. A program running on a virtual machine works exactly the same as if it were running on its own hardware.

Some virtual machine software include:

8242 questions
4393
votes
24 answers

How is Docker different from a virtual machine?

I keep rereading the Docker documentation to try to understand the difference between Docker and a full VM. How does it manage to provide a full filesystem, isolated networking environment, etc. without being as heavy? Why is deploying software to a…
zslayton
  • 51,416
  • 9
  • 35
  • 50
851
votes
22 answers

Addressing localhost from a VirtualBox virtual machine

I have a local test/development server (HTTP, of course), listening to port 8000. I'm working on Linux, so to test the page on Internet Explorer 6, 7, 8, etc. I run a virtual machine using VirtualBox; I also need to see how it look on Firefox in a…
hasen
  • 161,647
  • 65
  • 194
  • 231
745
votes
4 answers

What is the runtime performance cost of a Docker container?

I'd like to comprehensively understand the run-time performance cost of a Docker container. I've found references to networking anecdotally being ~100µs slower. I've also found references to the run-time cost being "negligible" and "close to zero"…
Luke Hoersten
  • 8,355
  • 3
  • 21
  • 18
722
votes
9 answers

Shortcut to exit scale mode in VirtualBox

What is the shortcut to exit scaled mode in Oracle VM VirtualBox, Windows 7/10 host?
foki
  • 8,624
  • 6
  • 33
  • 32
290
votes
8 answers

Where does Vagrant download its .box files to?

What happens to the .box file after the following command is executed? vagrant box add lucid32 http://files.vagrantup.com/lucid32.box I can't find the lucid32.box file on the file system after download has completed.
Calvin Cheng
  • 35,640
  • 39
  • 116
  • 167
190
votes
21 answers

VirtualBox: mount.vboxsf: mounting failed with the error: No such device

I'm using VirtualBox with OS X as host and CentOS on the guest VM. In OS X I created folder myfolder, added it as shared folder to the VM, turned on the VM, in CentOS created folder /home/user/myfolder and typing: sudo mount -t vboxsf myfolder…
cnaize
  • 3,139
  • 5
  • 27
  • 45
174
votes
37 answers

VBoxManage: error: Failed to create the host-only adapter

I am running vagrant 1.4 and virtual box 4.3 on fedora 17 machine. When I do "vagrant up", I get this error: Bringing machine 'default' up with 'virtualbox' provider... …
Adi
  • 4,149
  • 4
  • 25
  • 41
173
votes
23 answers

SSH to Vagrant box in Windows?

I'm using Vagrant to start a VirtualBox VM in windows. In other platforms, I can just $ vagrant ssh to connect to the VM. How do i connect to this Vagrant box in windows? The way suggested in Vagrant documentation to use PuTTy also did not…
Sathish
  • 20,660
  • 24
  • 63
  • 71
173
votes
11 answers

Using vagrant to run virtual machines with desktop environment

My company's development environment is based on virtual machines, running on VirtualBox. We would like to move one step further, and use the capabilities of Vagrant to have the description of the machine in a text file and then be able to "raise"…
PRiera
  • 1,731
  • 3
  • 11
  • 3
146
votes
9 answers

How do I change the UUID of a virtual disk?

I am trying to create a new virtual machine with Oracle VirtualBox, using an already-existing hard disk. When I try to select the existing hard disk file, a .vhd file, it displays an error saying the virtual hard disk cannot be used because the UUID…
CJAY
  • 6,989
  • 18
  • 64
  • 106
142
votes
21 answers

virtualbox Raw-mode is unavailable courtesy of Hyper-V windows 10

issues: Failed to open a session for the virtual machine ubuntu. Raw-mode is unavailable courtesy of Hyper-V. (VERR_SUPDRV_NO_RAW_MODE_HYPER_V_ROOT). Result Code: E_FAIL (0x80004005) Component: ConsoleWrap Interface: IConsole…
AKB
  • 5,918
  • 10
  • 53
  • 90
136
votes
3 answers

What are the differences between QEMU and VirtualBox?

Recently, I found out that there is the QEMU project. I've used VirtualBox before, and I know about Xen and VMWare. What are the differences between QEMU and VirtualBox? Should I stick with VirtualBox? In which cases is QEMU better?
Pavlo
  • 1,594
  • 2
  • 15
  • 30
133
votes
17 answers

Vagrant Not Starting Up. User that created VM doesn't match current user

I was trying to start up my vagrant machine, so I navigated to the folder where my vagrantfile is, and used: vagrant up && vagrant ssh but I got the following error message: The VirtualBox VM was created with a user that doesn't match the …
Luke
  • 1,736
  • 2
  • 16
  • 34
131
votes
7 answers

How do I access the host machine from the guest machine?

I've just created a new Windows XP VM on my Mac using VMware Fusion. The VM is using NAT to share the host's internet connection. How do I access a Rails application, which is accessible on the Mac itself using http://localhost:3000?
John Topley
  • 113,588
  • 46
  • 195
  • 237
130
votes
3 answers

What kind of virtual machine is BEAM (the Erlang VM)?

From what I understand a virtual machine falls into two categories either "system virtual machine" or a "process virtual machine". It's kind of fuzzy to me where BEAM lies. Is there another kind of virtual machine I am not aware of?
Eric des Courtis
  • 5,135
  • 6
  • 24
  • 37
1
2 3
…
99 100