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 with Xen

I am trying to run Windows XP in a Xen DomU virtual machine with a PCIe device, for which there are no Linux drivers, being passed through from a Debian Squeeze Dom0. My hardware supports ...
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1answer
2k views

VBoxManage: Error: Can't be used as the requested device

I used the soluton from this thread but always i get VirtualBox error: The medium 'lvol.vmdk' can't be used as the requested device type (0x80004005) I've tried all controllers SATA, SCSI, IDE and ...
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203 views

not all initrd.img's are born equal?

I am trying to get a Red Hat 5.8 box booting via pxe. The box is a virtual machine on ESX5.0 it has a Paravirtual SCSI Controller and VMXNET3 network driver. Now these drivers do not come default in ...
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1answer
5k views

What is the difference between virbr# and vnet#?

I am running KVM on RHEL6, and I have created several virtual machines in it. Issuing ifconfig command to the host system command line shows a list of virbr0, virbr1... and vnet0, vnet2... Are they ...
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2answers
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Why doesn't eth0 get an ip address when set up in a bridge?

I'm trying to understand how dhcp for IPv4 is used with bridging. eth0 is configured to be in br0. This is working just fine but only br0 gets a dhcp lease, while eth0 doesn't. Both are configured ...
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File permission issues with shared folders under Virtual Box (Ubuntu Guest, Windows Host)

I am using Ubuntu on Virtual Box and I have a folder which is shared between the host (Windows) and the VM (Ubuntu). When I open any file in the share folder in Ubuntu, I can not change it as its ...
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1answer
369 views

How to get the cloned guest connected to the Internet?

I made a clone of a VM(running a version of Centos 6) on KVM, but the clone wouldn't connect to the Internet. Issuing ifconfig shows no interfaces but the lo. Interestingly, the original system can ...
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1answer
105 views

How to boot a system in a second HD but runing the system in another one?

I have two computers, but the old one is not working well. So I'd like to install the old hard disk on the new computer. I know how to do this and I know how to access the data from sdb. But I have ...
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353 views

Connect to a VPN from a Linux Virtual Machine

I am running an Ubuntu distro inside a VMWare virtual machine with a bridged connection on a Windows 7 host. What I am trying to do is to have the virtual machine connect to a VPN, but I'm not having ...
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2answers
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Fastest remote X from Windows

I have the following set up: |-----------------| |---------------| | Windows | LAN (or VPN) | Linux box | | (local machine) | ...
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1answer
1k views

How to force Debian to wait for DHCP

I am running Debian squeeze in a virtual machine (VirtualBox). The machine has two interfaces: eth0 in "Host-only" mode so that the machine is accessible from the outside; and eth1 in "NAT" mode so ...
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1answer
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Does quiesce exist for Linux?

Quiescing a file system allows you to make a backup of the database while it is still running and other programs and their data as well. The application generally needs to be notified of the quiesce ...
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1answer
357 views

Make box only communicate on lan only?

I am running a VM with Debian as the guest OS (I can choose another distro). It has nginx running along with some other software. Some of the software tries to make outgoing connections (for example ...
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3answers
424 views

Physically break into box? (Memory & disk)

I have a VPS. I might be able to encrypt my partition but I havent tried. My VPS company I believe can reset my root password although the only SSH key I see is my own. With all my data I have it ...
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1answer
365 views

Can I setup a local webserver using ArchLinux and VirtualBox

I intend to create a local webserver using ArchLinux and VirtualBox for testing purposes. I just wonder if Arch Linux has what it takes to create a fully functional webserver?
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1answer
3k views

Getting config error for yum in CentOS

I'm very new to linux, and I am using CentOS in a VM for program testing. Everything seems to be fine, except for every few minutes I get this error: Error Type: <class 'yum.Errors.ConfigError'> ...
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1answer
116 views

How to setup backup if the filesystem is read only

My remote server file system is read-only & its because my hard disk is broken .I want to take backup for taking any further action. Is it possible to setup a manual backup for the affected ...
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2answers
763 views

good Ubuntu/Debian distro for a development/coding VM?

I have a Windows laptop, but I like to use Linux as a development/coding environment. Currently I am currently running Ubuntu 12.04 as a guest OS with VirtualBox. Some of the issues with this setup ...
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154 views

Unmanaged VPS bought today. Sendmail not functioning correctly

I purchased an unmanaged VPS today. I moved my website on over, and when I try to send an email. It returns a blank page. Not to mention I had to install PHP myself. Apache was there, for some reason, ...
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1answer
80 views

Where to find info on how to set up a vm in redhat 7.2

I have a RedHat 7.2 server that was set up by someone else long ago as an e-commerce server. It is still in use for that purpose and I dare not make significant changes to it as my Linux-fu is weak. ...
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1answer
457 views

What File Transferring Method (i.e. FTP) Can I Use for rlogin (Solaris 8 on SPARC)

For all my other Unix Virtual Machines, I use SSH and I use WinSCP to transfer files from my Windows Vista machine to the VM's. Now, One of the VM's is using rlogin, What can I use to transfer files ...
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2answers
2k views

Communicate between Ubuntu VM and Windows host

I'm running an Ubuntu VM on a Windows 7 host. I have two questions: I think that on Windows, localhost is a loopback address, and sending packets to it doesn't actually transmit any data on the ...
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89 views

Linux VPS Configuration

I just recently got my hands on a linux (Fedora) VPS and I would like to ask if there are special configurations that I have to be wary of. Do I still configure it like I would configure a normal ...
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1answer
1k views

Setting up SMTP-AUTH & TLS in Postfix

So I have been in the process of installing a Postfix Server on my CentOS 6.2 Virtual Private Server. I have been following this tutorial: ...
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1answer
335 views

Can you Chroot a program from an OpenVZ environment?

I just recently purchased a Virtual Private Server, and it is OpenVZ virtualization. I am setting up my LAMP stack, and in the past I have always just set up my BIND dns set up in a chrooted ...
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4answers
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Convert image of a partition into image of a disk with partition table

I have an image of an existing partition generated with dd if=/dev/sdXN of=image.bin. Now I want to use this image as the basis for a virtual machine. I know how to convert the image into a format ...
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2answers
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Cannot connect to my Virtual Box Ubuntu system

I have a VirtualBox running an Ubuntu OS. I'd like to access this Ubuntu machine using ssh or telnet. In order to do that I've performed the following steps: sudo apt-get install telnetd sudo ...
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2answers
1k views

Different domains for multiple VM's on host with one WAN IP

I've got only one WAN IP address bound to KVM host system and multiple VM's with internal IP's, say, 10.0.0.1/28. On the other hand I have multiple domain names bound to host system WAN IP. The ...
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1answer
452 views

How can I run `hackxor` inside VirtualBox?

I've found hacking game hackxor, but it's made for vmware. I don't have any experience with vmware and I don't want to install it in my machine. So I'd like to run hackxor inside VirtualBox if it ...
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3answers
335 views

Is there such thing as a “free” equivalent to Microsoft Virtual Server?

As the title says, is there? I'm a student, I'd love to play around with this technology without the fear of my licence disappearing the day I graduate from college (as it might with the Microsoft ...
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1answer
4k views

My VirtualBox Virtual Machine doesn't detect my USB attached disk

I'm using the latest version of both Virtual Box (4.1) and CentOS (6.2). I would like my Western Digital USB drive to be recognized by my VirtualBox guest operating system. My host system, Windows ...
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16answers
38k views

Any reason NOT to run Linux in a VM all the time?

I've switched to using Arch Linux for most of my day to day work and don't need Windows for anything but gaming and the couple of apps that aren't ported to Linux like OneNote. My Linux distro is ...
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669 views

Slow Internet Speeds with Backtrack5 R2 in VMware Workstation

I have been trying to get Backtrack5 to run smoothly on my new laptop and have run into a few issues. I have installed a version of Backtrack5 onto another laptop previously as the primary OS, and ...
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1answer
7k views

VirtualBox guest using Bridged networking unable to obtain DHCP address

I have a computer, called Loki, that works as a virtual machine host and DHCP server. The DHCP daemon is listening on port eth0. Part of /etc/dhcp.conf: subnet 192.168.13.0 netmask 255.255.255.0 { ...
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3answers
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VirtualBox: two network interfaces (NAT and host-only ones) in a Debian guest on Ubuntu

I created a Debian VM on VirtualBox with two interfaces: a NAT one (for accessing internet) and a host-only one. However, I do not know how to make both interfaces work at the same time. If I the ...
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2answers
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Partitioning for Web Servers

I was curious what some general best practices are in relation to partitioning for a new Linux VM that will be used as a web server? Are there certain guides that should be consulted or followed? ...
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3answers
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VNC send Ctrl+Alt+F1-F6 to server

I've been trying to figure this out now for a while, I'm connecting to virtual machines through VNC, and by default you get a graphical or ncurses interface, and CTRL+ALT+F3 takes you to a console ...
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1answer
2k views

Virtual unix command-line environment on the iPad

Is there a lightweight virtualized Linux or other unix environment that I can run on the iPad? Like VirtualBox for iPad. I only really need a minimal system — something along the lines of Microcore ...
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3answers
608 views

Command line friendly virtual machine

I've been using Virtualbox for a while now, but the only way I've learned to interact with it is through the graphical interface. Is there a way for me to send bash commands to the vm through the ...
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1answer
438 views

How to extend an ext3 partition over LVM inside a file (virtual machine)?

I need to extend the root partition of a virtual machine (VM) using LVM (Logical Volume Manager). I can afford a few minutes of downtime so a VM shutdown/reboot is fine. The virtual hard disk is in ...
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4answers
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Booting the already installed Windows from the VirtualBox installed in Ubuntu

I want to boot the Windows which is installed in laptop's internal harddisk(/dev/sda1) from the VirtualBox installed in my Ubuntu. Can somebody tell me how to do this in VirtualBox.
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4answers
3k views

Lightweight isolated linux environment

I want an isolated (guest) Linux environment on my computer that I can mess up without worrying about the host. E.g. install a lot of stuff from source without package management, pollute environment ...
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0answers
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How to access the data stored in guest operating system(i.e Virtual machine) from Host system [duplicate]

Possible Duplicate: Share memory between a virtual machine and the host I wanted to access the data stored in virtual machine from my host machine. I know that each VirtualMachine will have ...
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3answers
2k views

Share memory between a virtual machine and the host

Through shmget and shmat, I am able to access the data stored in one program from another program. Here's the gist of the code: key=ftok("shared.c",'c'); shmid=shmget(key,1024,0644|IPC_CREAT); ...
2
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1answer
314 views

Virtual machines on different X servers

Is it a good idea to run virtual machine on a different X server? I can switch between them using Ctrl + Alt + Fx shortcuts. If my default X server hangs/crashes, I can still continue to work with the ...
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2answers
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strange logs in /var/log/messages

My /var/log/messages contain lots of messages like this: Jan 22 05:45:05 vm kernel: hdc: drive_cmd: status=0x41 { DriveReady Error } Jan 22 05:45:05 vm kernel: hdc: drive_cmd: error=0x04 { ...
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9answers
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How to automatically start and shut down VirtualBox machines?

I need to run a software system that is intended to be installed as an appliance on a dedicated machine. In order to save energy, I plan to run the system on a VirtualBox VM instead. The host is a ...
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3answers
9k views

Which *nix distro is most lightweight for running virtual machines? [closed]

EDIT: This question was expanded to include other Unix-like distros such as Hurd and BSD. Before anyone wonders, I did read related questions and answers; I think I have a sufficiently unique ...
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2answers
6k views

Unable to boot VM: Error 13: Invalid or Unsupported Executable Format

I used VMWare vConverter and everything converted fine, but when I try to boot I get an error: The physical machine boots correctly, so I don't think it is a source machine issue. I am not sure why ...
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1answer
1k views

Limit process resource consumption in CentOS 5 (2.6.18 kernel)

I would like to limit the resource (CPU, Memory, and network bandwidth) consumption of processes on the same server. And it will be good if I can migrate processes from one server to another. I ...