VirtualBox is a free, open source virtualization program from Oracle for the x86/x86_64 architectures.

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Allocating server CPU cores to virtual box guests for heavy compute, light i/o load

Please share your recommendations for allocating CPU cores to guests on big iron. I am asking basically this question 6 years later: Is there an optimal setting for the number of CPU cores exposed ...
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18 views

vagrant re- installation problems

I had to move my environment to new account "newname" from the old one "oldname". I cannot re-initialize vagrant ( i tried vagrant init, or manually deleting /Users/newname/.vagrant.d), it still ...
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38 views

Mount existing partition on VirtualBox

I've been trying to boot my Windows 8.1 on a VirtualBox machine under my Linux Mint 17. Everything is in x64. I've installed VirtualBox and its GUI to do so. My Windows 8.1 is on /dev/sda2, my Mint 17 ...
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29 views

Windows 7 emulate wifi pci card as usb

I have a pci wifi card which I want to share with my ubuntu guest (virtualbox) so that it can act as a wireless router. I know that virtualbox doesn't allow pci passthrough so is there some software ...
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9 views

2nd monitor absent in VirtualBox

I'm using VirtualBox but cannot get a second monitor for my guest. Why not? As you can see in the screenshot, the Win7 guest actually thinks it has two monitors, but there is no window for the second ...
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12 views

Connect 2 physical machine drops Internet connection

I have 2 physical machines, with 2 VM on the first physical. I have been trying to connect 2 physical machines via RJ45 and give internet to the "lan" via NATting RNDIS on one VM (gateway) and routing ...
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1answer
69 views

Randomly getting booted off of SSH despite sending keepalives

I’ve cooked up a Debian 7 virtual machine (with VirtualBox) in an attempt to play with setting up my own server and other such cool tricks. This is all on one computer. I can SSH into the virtual ...
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122 views

LinuxMint 17.1 / Ubuntu 14.10 get stuck on reboot after install in VirtualBox

Trying to install LinuxMint 17.1 / Ubuntu 14.10 and it is getting stuck on the reboot phase after I install it in VirtualBox 4.3.20 r96997. How can I get this fixed?
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69 views

cannot mount vagrant synced folder after packaging box

I have created a vagrant box on osX. With the following configurations I can start the box to use a synced folder. config.vm.box = "mac_osx_1010" config.ssh.insert_key = false ...
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1answer
26 views

Emulating an older OS to use printer on windows 7

I've searched the internet inside out for windows 7 compatible drivers for my printer HP Color LaserJet 3550. I've also tried using a version lower and higher drivers to no avail. Windows 7 still ...
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37 views

How to shrink accidentally expanded VDI?

I've accidentally expanded a dynamically allocated VDI image to ~150TB instead of ~150GB using VBoxManage modifyhd (a lesson to learn: [--resize <megabytes>|--resizebyte <bytes>]) Now, ...
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101 views

How To fix a PPTP VPN client connection (Ubuntu on VirtualBox)

I have just installed Ubuntu 14.04 on VirtualBox and I'm trying to set up a VPN client. I have configured it with the same settings I use on a Mac and I am able to connect from that without any ...
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1answer
29 views

How to connect VirtualBox guest to the host using a VIRTUAL cross-over cable?

Is it possible to configure an Oracle VitualBox guest settings such that is connected to host by a virtual cross-over cable?
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16 views

Can I tunnel to a host-only device?

I have a tricky routing/tunnelling question, hoping someone can help. My setup is this: On my lan, I have a Ubuntu workstation and a Windows 7 PC. The Windows 7 PC is running Oracle Virtual Box, and ...
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1answer
37 views

Does Upgrading VirtualBox affect guest OS activation (Windows 7)

I am running a retail edition of Windows 7 as a guest OS in VirtualBox. Windows 7 activation is sensitive to hardware changes. In the case of a virtual machine, the hardware is mostly emulated. In ...
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16 views

Problems migrating a Windows XP virtualbox from UBuntu 12.04 to 14.04

I've recently re-installed my (now) Ubuntu 14.04 based server which was previously running 12.04. The server is headless and I used to be able to connect in via remote desktop but for some reason I ...
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73 views

Win7 pegging CPU at 100% from wuauserv - why?

I've used Win7 as a guest with an Ubuntu host in VirtualBox for 5+ years now. Recently, either a VirtualBox update or Win7 update has caused it to peg the CPU at 100% for hours, every time I boot it. ...
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34 views

Share a VirtualBox guest machine folder with host machine

My question is simular to this question. Since the question was asked years ago, virtualbox development has changed owners. In my case I have windows 8.1 running a windows 8.1 vm. Is there a way to ...
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21 views

VirtualBox (or WMWare) use VPN as Ethernet connection

I want to create VM and I want that guest OS (Windows) have internet only from VPN, that is created on Host OS. If VPN connection on HOST OS in off - Guest VM must not have any internet, ethernet ...
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1answer
53 views

Vt-x is disabled in BIOS - Failed to open a session for the virtual machine Kali Linux 1.0.9

I am trying to load Kali Linux(kali-linux-1.0.9a-amd64) on Oracle Virtualbox and encountering the following error. How do I fix this?
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28 views

Virtualbox no internet connection at guest OS

I am newbie in this virtualbox thing. So i have no idea how to configure network settings. I have Windows 7 (32bit) as Host OS and Ubuntu (32bit) as guest OS. The issue is that i am not able to access ...
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10 views

What is the difference between Virtualbox .SAV and .VDI files?

I thought that VDI is virtual disk image, and then I learned that it is also used for snapshots. So I opened the snapshots folder and found a bunch of VDIs. So far so good. Then I read somewhere that ...
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1answer
42 views

SSH to a local VirtualBox with Ubuntu

I installed an Ubuntu server image on VirtualBox. Next I configured port forwarding 2222=>22. When I use the following command things work ok : ssh -p 2222 java@127.0.0.1 Password is prompted and ...
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2answers
36 views

Inserting Oracle Solaris 11.2 Repository on VirtualBox Oracle Solaris 11 (64 bit)

I downloaded Oracle Solaris 11.2 Repository from Oracle.com and i can't figure out how to uncompress it and insert it on VirtualBox.. Please let me know what steps to take.. Thank you.. My e mail is ...
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33 views

How to tell virtualbox how to boot from cloned direct access partition

I've managed to paint myself into a corner. I have a ubuntu machine with a virtualbox windows VM on that I spend about 4hours working in each day. I read up online that having direct disk access for ...
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33 views

Some audio devices (PCM_in) could not be opened

Some audio devices (PCM_in) could not be opened. Guest applications generating audio output or depending on audio input may hang. Make sure your host audio device is working properly. Check the ...
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50 views

VirtualBox errors out saying it needs more free disk space when space is clearly available

At my work environment we use VirtualBox for testing. It is set up as Windows host and RHEL 6 as client. Now during testing sometimes the error message popping up which says: You need to free ...
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61 views

Cannot reliably automate xrandr settings in Debian 7 on VirtualBox

Although there are several existing questions on the matter (from which the most helpful answer is this) and various threads on other forums, I cannot reliably set my xrandr settings in Debian 7 on ...
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22 views

Unable to connect to internet from Centos VM

I am using VirtualBox 4.3, I have installed Centos 6.3. I have two adapters attached. 1) NAT 2) Host-Only I want to be able to setup a cluster of 3 machines which can talk to each other and also be ...
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40 views

How to run VMWare and VirtualBox on OSX with Bridged Networking

So here's the issue. I'm running OSX Mavericks as host OS. I've had VirtualBox for a while, and I typically use bridged networking for the VMs I run on Vbox. Had no problems there. I recently ...
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2answers
57 views

Cannot uninstall SQL Server 2008 from Windows Server 2012 r2

I have install SQL Server 2008(64-bit) express on the virtualbox in virtual machine, with guest os Windows Server 2012 R2(It is also domain controller). After the installation, I decide I would like ...
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29 views

Install Windows 8.1 on VirtualBox

I mounted a Windows 8.1 .iso and booted from it. The image below is my issue. I have no idea how to continue. I am trying to install from Ubuntu 14.10.
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1answer
38 views

Connecting to host OS database from guest OS VirtualBox virtual machine

I’m using Pentaho BI server in a CentOS VirtualBox machine, and now I want to connect it to an SQL Server database that I am running in my Windows host OS (localhost). Is there a simple way to do ...
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19 views

Error when running boot2docker from inside Virtual Box

I get Non existent networking host interface name: VirtualBox Host-Only Ethernet Adapter #2 (VERR_INTERNAL_ERROR) error when I try to run boot2docker from virtual box. Error Details: Result Code: ...
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1answer
14 views

VMWare Guest Accessing Host Statistics

I have tried researching this but unfortunately couldn't come across an answer. Is it possible for a vmware esx virtual machine to access statistics about its host machine such as CPU and memory ...
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33 views

How to enable file change notification for network drives?

When you run any program handling local drive, when you externally change file the program usually detects such change and offers to reload it. When the file is located on network no such thing ...
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38 views

VirtualBox Ubuntu Guest OS Doesn't Capture Keyboard

I have Ubuntu 14.04LTS 32-bit running as a VirtualBox guest OS on a Windows 7 64-bit OS. The auto capture keyboard feature is enabled in VirtualBox's preferences so that Alt-Tab keystroke combination ...
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48 views

Renamed etc directory Ubuntu 14.04, rolling back changes doesn't fix created issue

A friend told me he used to go around his VM Linux installs and break things to learn how things worked and to learn how to fix them. I have an Ubuntu 14.04 VirtualBox Linked-Clone created for the ...
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18 views

How to Create a VirtualBox like Oracle developer day VM using CentOs?

Oracle has provided us a way to use Oracle Database on Mac with its Developer day VM's. But its of huge size and I couldn't resume the download. So I want to build a VM with Oracle Database installed. ...
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31 views

Using virtualbox port forwarding with ports <1024 and authbind with linux?

I'm trying to use Virtualbox to separate the services on my machine into their own VM. To achieve this it would be helpful if I could set up port-forwarding from the host to the guests. (using ...
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1answer
46 views

How to redirect TCP traffic from one virtual machine to another in Linux?

What is the simplest way to redirect all TCP traffic from one virtual machine to another in Ubuntu Linux and reverse? And what type of connection I suppose to use in VirtualBox?
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22 views

Why this vagrant file creates 7 network interfaces rather than 3?

I want to do some testing to compare dhcp vs fixed ip of host-only network of virtualbox. I have come up with this Vagrantfile: # encoding: utf-8 # -*- mode: ruby -*- # vi: set ft=ruby : ...
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7 views

Ubuntu 10.04 task-bar content not right aligned in virtual box

I installed Ubuntu 10.04 in VirtualBox. I installed the guest additions. My display resolution is set to 1920x1080 For some reason, my task-bar content doesn't right align. Have a look at the ...
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1answer
43 views

VirtualBox with inaccessible snapshot

So I have a VM done with VirtualBox a few year back, then, 2 years ago, I created a new one using the existing HDD, so VirtualBox decided it will create a differencing HDD instead of a new one like I ...
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13 views

How to use VirtualBox on raw disk where I have my system

I have a dualboot on the same physical drive, but not on the same partition. In windows, I'd like to use virtualbox to boot on linux, like that: VBoxManage internalcommands createrawvmdk -filename ...
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1answer
77 views

Vagrant up command not working

When I do vagrant up command, I get the following error: There was an error while executing `VBoxManage`, a CLI used by Vagrant for controlling VirtualBox. The command and stderr is shown below. ...
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70 views

Genymotion resets VirtualBox networking to “Host-only Ethernet Adapter”

After some (VMWare) deinstallations Genymotion virtual machine can't access Internet. In VirtualBox networking settings there is "VirtualBox Host-only Ethernet adapter set". Ok, I change the adapter ...
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1answer
35 views

Mouse Cursor Dissapears in VirtualBox (windows 7)

I am currently trying to install os x mountain lion as a guest os on my windows 7 pc so that i can use Xcode. I am using this guide: ...
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25 views

Unable to port forward to VM through loopback (127.0.0.1)

I have a somewhat strange issue on my PC where I am unable to reach a Virtual Box VM with port forwarding through 127.0.0.1. It will however work through 127.0.100.1, or 127.x.x.x for that matter. I ...
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19 views

VirtualBox on QEMU host?

I have remote access to a QEMU Windows Server 2012 (64 bit) VM with 12 cores @ 2.8 GHz ("QEMU Virtual CPU version 2.0.0") and 48 GB RAM. For a project I wanted to set up a Linux VM on VirtualBox on ...