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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Running -march optimized software on another architechture?

I'm running an Athlon64 server with LFS and would like to have a local copy of the server in a virtual machine for testing purposes and building software. My PC uses an i7 and the existing server ...
1
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1answer
2k views

Guide to installing Xen on CentOS 5.9 (That is still valid)

I need an idiots guide to installing Xen Hypervisor on CentOS 5.9 We attempted to install it on 6.3 before, but completely failed, so we reverted to 5.9 to see if we had more luck. We had issues ...
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1answer
3k views

Is it possible to install KVM On A VMWare virtual machine? If so, what are the steps?

I want to understand how to use KVM in CenTOS. At the moment, all I have is a VMWare ESX 5.x server to use. Is there a way to get KVM working on a system that is running on VMWare? Essentially, a ...
2
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1answer
404 views

How to use a backup in OpenVZ

I have a backup (.tgz file) that is an openvz virtual machine. i followed this article and i setup an openvz container but how i will use my backup file? EDIT: i found the tool ovz-web-panel (i am ...
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0answers
529 views

Problem getting Fedora to run in VirtualBox

I'm using Ubuntu 12.04 64-bit, trying to get Fedora 18 64-bit to run in the Oracle VM VirtualBox. I've got VirtualBox installed (via the .deb package available from the official site,) and I got the ...
3
votes
1answer
227 views

How to enlarge existing file to specific size

I have hdd.img file, which I user as HDD for my virtual machine, but it's size is too small, how can I enlarge it? There is one method, something like: dd if=/dev/zero ds=10GB count=8 >> ...
0
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2answers
301 views

Create a CentOS Guest img over Ubuntu

I want to create a basic CentOS 5.8 system from scratch. for now i build my own img for Ubuntu Guest (debootstrap), my host is a Ubuntu 12.04.1LTS but I don't know how to make for a CentOS, is ...
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1answer
5k views

“client denied by server configuration” with “AllowOverride All”

I've installed CentOS 6.3 with Apache 2.2 on a VM. I'm trying to set up a LAMP stack with these VirtualHosts: localhost loads the path /var/www/html/ lcl.mydomain.com loads the path ...
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2answers
718 views

disabling ssh session expiration

I am installed Ubuntu on Virtual Box, and use xshell (a remote terminal application) to ssh to ubuntu. when I hibernate computer during night, after powering it on, the session is expired and I should ...
1
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1answer
150 views

High-latency VM-centric workstation, vs. low-latency, (but, hack-ish) configuration for Oracle 11g

tl;dr Low-latency native (i.e. VM-less) development workstation vs. higher latency VM-centric workstation? Hey StackExchange, I'm unsure of whether or not I should be using a VM for development, as ...
4
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2answers
743 views

Does FreeBSD support network virtualization like Crossbow?

Does FreeBSD support network virtualization like Solaris Crossbow? I've tried to follow the VImage links from the FreeBSD wiki page, but the links are mostly dead. If VImage is no longer part of ...
0
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1answer
661 views

How to install FTP server on Red Hat VM?

I have a windows machine and I need to transfer files from my machine to another Linux virtual machine which I have created. How do I install a FTP server on those VM's to transfer files via FTP ...
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2answers
2k views

Openstack for home cloud hosting

I am experimenting with a couple of technologies that I soon may have to use at work. So for now, I was thinking about duplicating the environment which I may have to create for my office at home so ...
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2answers
843 views

Linux guest VM on mac host - Keyboard

I use a Mac as a development box, but am slowly transitioning to Linux. So I am spending the majority of my time in the Linux guest VM while working. But I still spend a fair amount of time in Mac ...
2
votes
3answers
966 views

How to access a KVM virtual-machine?

I've created a KVM VM using virt-install. There is an image file in the directory /ssd/kvms. How do I access the virtual machine and turn it on? Do I need to assign an IP address, and if so, how do I ...
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0answers
1k views

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 ...
2
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1answer
643 views

Can QEMU/KVM+OCFS2 be configured to punch holes in sparse image files when files are deleted in the guest?

I'm using sparse raw image files for guest VMs and OCFS2 on the host (local-only, not clustered) for the reflink feature. I understand from Googling around that OCFS2 is one of the filesystems that ...
2
votes
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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0answers
248 views

Setup Cloudmin on Centos installed in LVM

I installed CentOS 6 with default LVM partition pattern. according to this pattern Can I use Cloudmin and store KVM Disks in LVM as Logical Volume? I think Cloudmin requires creating new logical ...
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0answers
217 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 ...
3
votes
1answer
7k 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
3k views

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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6answers
54k views

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
503 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
108 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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0answers
448 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
3k views

Fastest remote X from Windows

I have the following set up: |-----------------| |---------------| | Windows | LAN (or VPN) | Linux box | | (local machine) | ...
5
votes
1answer
2k 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 ...
5
votes
1answer
2k views

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 ...
2
votes
1answer
506 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
457 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
1k views

kvm doesn't load Windows 8

I'm launching kvm with the following parameter: kvm -m 2g -smp ncores=2 -hda disk.img -cdrom win8.iso My CPU has VT support and enabled, EDIT I seems to have limited emulate type: pc ...
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1answer
393 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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votes
2answers
4k 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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votes
5answers
18k views

How to improve Windows perfomance when running inside KVM

I use Ubuntu 12.04 64-bit and KVM, my CPU is Core i5 3.3 GHz and I have 8 GB of DDR3 RAM. I run Windows 7 in KVM and it's extremely slow. My co-worker use Debian on the same PC configuration and can ...
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1answer
126 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
969 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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votes
2answers
337 views

Prevent hacking the grub.conf using a 'live rescue' from a live linux iso

It happened that I had set the grub password in grub.conf. But, using a live linux iso, I was able to delete the password from the grub.conf. Please read the steps for the same mentioned in this link: ...
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0answers
162 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, ...
0
votes
1answer
87 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. ...
1
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1answer
545 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 ...
0
votes
1answer
712 views

How to compile kernel for KVM guest (without paravirtualization)?

So I have a KVM machine, where I run an Ubuntu 12.04 (server edition). I want to compile a minimalistic kernel for the KVM guest, but I only found the howto for hosts, and guests with ...
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0answers
313 views

Configure vmware-tools without an initrd image?

Is it possible to run vmware-tools without an initrd? I don't know why I should use an initrd and it makes my kernel compilation more complicated. I can boot into my kernel without initrd but when I ...
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1answer
2k views

How to enable WIFI on VMWare Fedora 12? (It's detecting and working fine on Windows 7)

I am new to Linux. I have Fedora 12 running on my VMware. I am unable to see any options to enable WIFI connection on Fedora. When I am accessing Internet through WIFI and its working perfectly fine ...
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2answers
94 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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votes
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
3k views

Bridging ethernet interface

I have a server with 4 public IP's. I have it with this configuration and I want to bridge the interface eth0 for using it with KVM: So, I have 3 IP's (A.B.C.144, A.B.C.145, A.B.C.146) and another ...
4
votes
1answer
406 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 ...
9
votes
2answers
2k views

Tools for Monitoring Steal Time (st)

We're running on a virtual "dedicated" server, which should, in theory, mean that we're the only guys on the server. In practice.... I'm thinking we might not be. Notice that although it looks ...