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.

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Hardening Virtual Machine

I have a CentOS based product I'm looking to distribute it as a virtual machine (VMWare, XEN and KVM) and I have been lately assessing the steps needed to protect the VM. The VM's data shouldn't be ...
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1answer
1k views

Getting same IP address for cloned Virtual Images

I was trying to install 3 VM and instead of creating them individually (by using the New VM) I actually cloned them. Now after I start the VM (they are running in the bridge mode) all the VM's are ...
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5answers
717 views

How to keep track of vm hosts and guests and IP addresses?

Internally, we have several VM hosts. We are constantly provisioning new guests on these hosts. What tool to you guys use to keep track of what hosts hosts you have out there, the host system stats, ...
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1answer
231 views

Performance of Virtual machines on very low end machines

I am managing a few cheap servers as my user base isn't large enough to get much more powerful servers. I also don't have the money lying around to invest in a server to prepare for the larger user ...
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3answers
920 views

OpenVZ - share files between virtual machines (VEs)?

Is there any way to share a directory of files between virtual machines running in OpenVZ? My particular use case is that I want to have a shared YUM cache directory, for when they all need to run ...
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2answers
203 views

How can I keep important VMs in memory without disabling swap?

VM Host -> Xenon E5-2440 w/ 48G mem... Everything runs CentOS6.5 (2.6.32-431) I have 4 guest VMs running each w/ 2G of memory. Their disk images are local files. The host machine is also running a ...
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2answers
2k views

How to edit/add file in VMDK

I have a VMDK (with several partitions) file which I need to modify. It is not attached to any particular virtual machine. I've tried using vmware-mount (from the VDDK toolset) in on Ubuntu server ...
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1answer
415 views

Use SSHFS on XenServer 6.1

On Xen Server 6.1, to backup my VMs, I use a script based on the following tools: xe vm-list to build a list of the VMs to backup xe vm-snapshot to take a snapshot of the VMs xe template-param-set ...
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1answer
245 views

Sync virtual machine hostname to displayName in VMware ESXi 5.1

How can I read the paramater called displayName in the .vmx file or "Virtual Machine Name" in vSphere Client from within the VM. If this is possible with vmtoolsd I haven't found it yet. ...
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1answer
259 views

VM Partitioning

If this isn't the right place to ask this please redirect me. I'm using hyper-v to create virtual machines, I have 1.6TB to use, I have the parent on a partition of 50GB, how should I divide up the ...
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3answers
2k views

KVM: maximum number of cores and amount of memory for VMs

I have a new 8 core machine with 16GB of RAM. I want to run VMs on it using Ubuntu and KVM. Nothing else but SSH will be running on the host. My question is what is the maximum amount of cores and of ...
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2answers
1k views

Can you operate a lmgrd license server on a linux VM?

We are running the lmgrd license server on a bare metal linux system. From my understanding, a Linux-based lmgrd uses the MAC address of the primary ethernet board as the parameter from which the ...
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2answers
348 views

ESXi / OpenSolaris / ZFS / Linux

I've been using my Opensolaris BOX for while, with 6 internals drives under ZFS. More recently I've been playing with ESXi and i've got to say this platform is amazing; therefor my plan is to buy a ...
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1answer
821 views

ESX shut down VMs when some but not all storage paths failed

I've been on hold now for an hour waiting for VMware support and am betting serverfault can beat them to the answer! I am running ESX 4.0 and 4.1 on 6 HP blades, using FibreChannel LUN storage. We ...
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2answers
1k views

How to manage changes to set of cloned Virtual Machines?

I am trying to set up a workable model for development. I'm wondering if anyone has recommendations for Virtual machine software and what process to follow to enable the following: Developers grab ...
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1answer
928 views

Hyper-V performance comparisons vs physical client?

Are there any comparisons between Hyper-V client machines and their physical equivalent? I've looked around and can find 4000 articles about improving Hyper-V performance, but I can't find any that ...
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7answers
9k views

Problem booting virtual machine after converting VMDK to VHD

I used the VMWare VCenter Converter Standalone Client to convert a physical drive on my old PC to a virtual drive. The conversion worked fine and I ended up with a valid VMDK file. Next, I wanted to ...
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1answer
456 views

Limit httpd.exe CPU usage

We are using Collabnet Subversion Edge in one of our VMs, and occasionally one of the httpd.exe processes spikes to ~100% and just sits there. I believe it's interfering with our overnight backup ...
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1answer
4k views

Performance issue of Server 2012 VM on ESXi 5.1 U1

I'm having issues with a VM, as stated in the topic, that runs on ESXi U1, build 1065491. The machine is sluggish and i can't figure out why.. Here's the details. It runs on a Dell T420, has ...
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1answer
502 views

ESXi 5.1 on Poweredge 510 freezes after base-esx update

Background / Problem Just experienced an issue where an ESXi host was upgraded from 5.0 --> 5.1 perfectly fine. Then, I did a scan and remediated a patch (ESXi510-201210401-BG) Looking into the host ...
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1answer
2k views

Installing Centos 6 using virt-install over SSH with no graphics - beginner

I have a Centos 6 box with virtualised CPUs that is ready for installing a virtual OSs. I am installing remotely over SSH and my Centos 6 box has no GUI (no GNOME etc) so it's purely command line. ...
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1answer
385 views

Getting CPU steal times on Ubuntu 11.4 Virtual Box

I'm trying to check on CPU steal times in a virtual machine. The goal is for me to be able to detect if my app is running in a VM on over-committed hardware. I'm currently just testing, in ...
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2answers
1k views

How can I restore VM on a new Hyper-V server?

I was working gladly with my VM on my local Hyper-V server. But, after installing some updates on the host the system only show the famous blue screen. I couldn't start my host so I reinstalled it and ...
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1answer
2k views

Using m0n0wall in a VM for testing

I'd like to use m0n0wall inside a (VirtualBox) VM to play about with and see what it can do. Ultimately the goal is to have a number of virtual machines connected to a internal virtual network which ...
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1answer
3k views

Using Windows XP Mode Virtual Machine on a Domain

I've followed the instructions and installed and configured the Windows Virtual PC XP Mode. I've added it as a machine on the network and can log into it and use network resources. In the process I ...
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1answer
49 views

How can I stop Azure from randomly replacing network cards on VMs?

Azure seem to have the habit of randomly changing the hardware configuration of virtual machines, without telling anything to the user. This is of course mentioned in the documentation, although ...
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0answers
227 views

ESXi 4.1 VM gone after hard reboot

I have a serious problem here. After I forced a reboot of a freezed ESXi 4.1 server, a VM is literally gone. When I ssh to the host and run ls -lah inside the datastore, it returnes: ...
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0answers
420 views

Most VMS refuse to start

Setup: Virtual Host, running server 2012, hosting around 10 production VMs Problem: Last night, 2 VMs stopped with no warning, event log notification, or any information. The rest of the VMs on this ...
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2answers
1k views

How can I hide a Virtual Machine in the Hyper-V Manager, so that only administrators can see it?

I have a domain controller that is a virtual machine, last week a user logged on to it and shut it down accidentally. I need to prevent this from happening so I would like to hide this VM in Hyper-V ...
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6answers
10k views

Common and maximum number of virtual machines per server?

For a project I am trying to get real-life estimates for the number of virtual machines per server, both typically and maximally. Of course, the maximum number of VMs would be depending on the type ...
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4answers
535 views

VM Corrupted, what's the next step?

So one of our older VM's, which usually has no issues, is giving this error now when starting. It keeps going in a loop restarting and turning off with this error message. I figure it's probably ...
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7answers
8k views

How to shrink the size of a virtual machine hard disk

I have a Virtual machine hard disk over 20GB in size. But there are only about 8-10GB of files inside. I need to shrink this vhd file to a more manageable (actual) file size. I've tried using the ...
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7answers
5k views

Copy VM from ESXi 5 to ESXi 4?

Searched Serverfault (and Google) for this, haven't been able to find an answer... We copied a VM (folder and files) from an ESXi 5.0 server (5.0.0-623860) to an ESXi 4.0 server (4.0.0-261974). (Also, ...
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6answers
6k views

How to improve Hyper-V performance

I have a windows 2008 (RC2) server running Hyper-V with all of my company's virtual machines. Most of the machines are used to run Continues integration and test environment. Although each machine ...
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4answers
3k views

Rsync Remote to Remote

I'm looking for a solution for using rsync between 2 remote servers. It seems like its not possible. Does any one know why its not possible? I ask that because I think if I know the reason, maybe I ...
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3answers
524 views

Would we be able to find out what VMs the parent server is using?

I am asking a rather ridiculous question here. Is there any way we can find out from the guest OS the parent OS and the VMs it is using? If it is possible, what command do we invoke from the guest OS? ...
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6answers
691 views

How to Create Two Virtual Private Servers on a single Physical Server?

I am a virtualization newbie. I basically have one physical server right now. And I want to create two virtual machines (both will be web servers with small databases and a few scheduled tasks) on ...
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3answers
12k views

How to reduce virtual machine disk size (Hyper-V)

I have server 2008 that runs several virtual machines. Due to an error each machine was allocated with a lot of disk space. I want to change the maximum size limit of the virtual machines but I ...
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2answers
5k views

How to rename a VMWare ESXi 5 VM physically?

When I create a VM on a VMWare ESXi 5 server naming it "MyVM" then "MyVM" directory is created on a data store and files like "MyVM.vmx", "MyVM.vmdk" etc. in it. I've renamed the VM and would like ...
2
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3answers
6k views

How to backup VirtualBox virtual server?

I'd like to setup a server running in a VirtualBox virtual machine on a Linux host system. What would be an effective way to backup this virtual server "whole", so that in the event of either a host ...
2
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6answers
3k views

Simplest way to backup hyper-v machines while they are running?

I'm only getting started with virtualisation. I have a server running Windows Server 2008 R2 Standard and Hyper-V Manager. This server is the host of several virual machines (also Windows Server 2008 ...
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2answers
4k views

Hosting multiple domains on seperate servers but only one public IP address

Is there a way to host multiple websites with different domains on the same public IP address, and when the user enters, say example1.com that goes to one server on my private network(192.168.1.20), ...
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2answers
2k views

VMware ESXi 4.0 upgrade to ESXi 5.1 minimize VM downtime

I am looking for the least amount of down time to do the following: Issue: One ESX Host running ESXi 4.0 (locally attached storage) with one VM running on it. This host needs to be updated to ESXi ...
2
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2answers
359 views

How do I give label to vSwitches on VMWare?

I've searched extensively trying to name the vSwitches that I create, but all I can name them are "vSwitchX" where x= some number. How do I give these switches names? I'm using the Web Client. ...
2
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1answer
126 views

Windows Server 2012 Hyper-V Rename - SQL DB Issues

I set up a Windows Server 2012 virtual machine exactly the way we want it. I shut down the instance, made a copy of the .vhdx virtual drive, then spun up a new VM and attached the copy of the drive. ...
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2answers
104 views

Dividing sets of services on a single server

A group which I'm part of has grown and is about to move from using DigitalOcean VPSes to a single colocated server. At this point, we don't have a need to distribute our service very highly. This ...
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1answer
886 views

Why are eth0 and vmbr0 (bridge) having the same MAC addresses?

I configured my Debian (with KVM on board) as following: /etc/network/interfaces: auto lo iface lo inet loopback auto eth0 iface eth0 inet manual auto vmbr0 iface vmbr0 inet static address ...
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1answer
132 views

Windows Server 2008 Data Center vs Standard Overhead

We are moving to virtual servers with Hyper-v and have MS W2K8R2 Data Center on the hosting servers. My question is there any reason to use Standard vs Data Center for a virtual machine that ...
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1answer
13k views

How to change a VM from split across multiple .vmdk files to a single one or two?

I have a VM with 3 partitions. One main one, one for swap space, one for storage. However, there are dozens of .vmdk files. Some of those .vmdk files are very large (over 1 GB), but the majority ...
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4answers
2k views

Small Linux distro for use as server

I'm doing a development that requires multiple machines, in-order to check. Currently, I'm running Python code on a full-fledged Linux VM. This makes it hard for me to run more than 2 machines inside ...