Virtualization is a group of software technologies that allow abstraction between layers of a system. This allows separation between the logical layers of the system, providing isolation, flexibility, and/or the ability to run more than one at a time. This differs from most traditional systems where ...

learn more… | top users | synonyms (2)

5
votes
3answers
17k views

What is the difference between RHEV and oVirt?

When I read the wikipedia articles about RHEV and oVirt, I can't really figure out why Red Hat have both projects, as they seam to solve the same problem? http://en.wikipedia.org/wiki/RHEV ...
5
votes
7answers
2k views

How do I move my production servers into a devlopment VM?

I have about 3 servers that are probably almost 10 years old, all using code what one might consider worst-practices for programming's sake. I'm terrified of making changes to the thing (production ...
5
votes
9answers
297 views

Why is Virtual PC being bundled with Windows 7 significant? [closed]

As I see it: Microsoft has always provided backward compatibility for legacy applications; As far as the end user is concerned, things won't be behaving any different from what they normally expect. ...
5
votes
1answer
58k views

CentOS 7 Minimal Install doesn't comes with networks scripts? Which version to use then? [closed]

I'm installing CentOS 7 as virtual machine but I'm having some problems related to network. As image shows I select Minimal Install for later add trough YUM any packages I want as for example: PHP, ...
5
votes
4answers
297 views

Virtualization for hardware resiliency?

Can anyone tell me if it is possible to pool several physical servers to run a resilient virtualization environment. Our servers are getting more and more critical to our clients and we want to do ...
5
votes
5answers
4k views

What's the point of running a virtual instance?

I sometimes hear things like "we have 5 servers, with 20 virtual xen instances". Why would you do this? What advantages does this have? Is it so you get the redundancy of multiple servers from only ...
5
votes
4answers
636 views

Different ways to shut down a system

I was asked this question in an interview for QA position: Tell me all the possible ways you can shutdown your system. The system could be in a network. I know this question is little vague. ...
5
votes
7answers
1k views

Virtualizing Solaris 10?

What is the best way to virtualize Solaris 10 (not OpenSolaris) under Linux or OpenSolaris? I have software that is only supported under Solaris so OpenSolaris is not an option. I'd like to have ...
5
votes
2answers
6k views

Am I using virtio for my KVM guest?

In one of my KVM guest, when I typed the following command, I get the following /sbin/lsmod | grep vi virtio_balloon 3692 0 So does it mean I am using virtio? Update: When I type cat ...
5
votes
2answers
3k views

Migrating virtual (VMWare) workstations from AMD to Intel hardware

We're a small dev team that runs instances VMWare Ubuntu hosted on AMD x64 machines. Our hardware will be upgraded to Intel i7, but we want to continue to use the virtual images we've built. But ...
5
votes
9answers
18k views

How to find out if a Solaris machine is virtualized or not?

I have a set of machines and want to know how to find out if a given machine is virtualized or not. Any commands?
5
votes
7answers
520 views

Any guidelines to think about when considering virtualizing an exchange server?

A friend of mine's shop is considering virtualizing several of their servers, including their Exchange servers (2007) and their BlackBerry-Exchange gateway systems. The systems support roughly 150 ...
5
votes
3answers
2k views

Windows Virtual PC and VirtualBox on the same PC

I am running Windows 7 Professional x64. Presently I am using Windows Virtual PC. I'd like to try VirtualBox. Can both virtualization platforms be installed and run on the same instance of Windows? ...
5
votes
5answers
957 views

Use or don't use virtualization for Linux Webserver?

I maintain the servers for a big webproject (java + postgres + some tools around) which is currently hosted on three machines: Machine: Mailserver (postfix), Ad-Server (lighttpd + php + openx) ...
5
votes
1answer
656 views

Virtual vs. Named SQL Instances

What are the benefits to using virtual as opposed to running multiple instances of SQL on a box?
5
votes
5answers
231 views

What should be considered when purchasing a virtual machine set up?

I've been asked for an opinion about a purchase of a blade server that should be used for running virtual machines. I have very little experience in this, so what things should be considered in terms ...
5
votes
4answers
4k views

Virtualization platform for older hardware (non Intel-VT/AMD-V)

I am trying to build a small virtualized testbed using some older Xeon-based servers that do not support Intel VT-x. In their previous use, the servers were running VMware ESX 3.5. Is there a more ...
5
votes
3answers
223 views

What options do I have to clone a physical server as easily as a virtual machine?

We use virtual machines a great deal at my company, Hyper-V mainly but we have also dabbled with ESXi plus vCenter. Besides the traditional advantage of being able to consolidate many physical ...
5
votes
2answers
1k views

Difference between “Windows Virtual PC” and “Microsoft Virtual PC”

What is the difference between "Windows Virtual PC" (RTM released today) and "Microsoft Virtual PC"?
5
votes
3answers
3k views

Where to install ESXi so that all local drives are available to VSAN

I am currently setting up a new 3-host VSAN cluster that will be placed into production soon. (Note this is the newer "Virtual SAN" (VSAN) technology, not the older vSphere Storage Appliance (VSA) ...
5
votes
6answers
396 views

Can A Virtual Machine Be Converted to a Virtual Server e.g VMWare?

The Simple Question Can I convert an existing VM to a Virtual Server (e.g. VMWare)? I'm using Oracle's one and only awesome product, VirtualBox, and I'm trying to setup a SharePoint Farm to ...
5
votes
2answers
181 views

Hyper-V Virtual Switches and DHCP

What is the best way to force VLAN segregation accross multiple Virtual switches? I have probably a rather complex setup going in the effort to get essentially 4 separate virtual switches. The ...
5
votes
5answers
6k views

What is the best distro to host a KVM virtualization solution

I am looking for a Server oriented distro that we can expect have decent support but also offer as much as possible some of the latest features that KVM might offer. I am leaning towards Ubuntu LTS ...
5
votes
2answers
774 views

PostgreSQL database server virtualization, yay or nay?

Our former CTO (now "consultant") at some point warned his replacement about not virtualizing database servers, specifically our PgSQL database servers, but rather run them as actual, physical ...
5
votes
3answers
2k views

Certain SQL queries performing very poorly in ESXI hosted environment

We recently set up a new machine with 8 dual-core CPUs, 20 GB RAM, and 3 1-TB drives set up in a RAID of some sort resulting in 2 1-TB drives we actually get to use (I'm not the hardware guy here). ...
5
votes
3answers
8k views

Using LVM snapshots for KVM virtual machine clones

So, I've got a pretty awesome KVM setup running now, CentOS5.5 on the host and guest domains, libvirt managing all the configuration, etc. The guest domain filesystems are stored in LVM on top of a ...
5
votes
2answers
541 views

Does LXC container performance depends of host load?

I am wondering if LXC could offer a full isolated benchmarking environment. Let's say we have 2 identical machines, with the same fresh Linux and without network connection. First machine has a load ...
5
votes
1answer
4k views

Expose virtual machine (vagrant) to local Wifi

I've setup a local virtual machine (ubuntu 12.4) using Vagrant (www.vagrantup.com) and need to share its resources on my local wifi network. It is basically running a webserver which should be ...
5
votes
3answers
3k views

CentOS6 installation from CentOS5 box?

I am trying to build a new CentOS 6 VM from my CentOS 5 host, but it appears that something fundamental has changed between these versions: $ rpm -ivh --nodeps --nodigest --ignorearch --ignoreos ...
5
votes
3answers
550 views

Quick and clean ways to clone virtual machines

I have 2 hypervisors running. One is an ESXi 4, the other one a Hyper-V 2008 R2. My question is: What is the cleanest and easiest way to clone a machine under each hypervisor without using any ...
5
votes
1answer
335 views

virtual_alias_domains - how to use different IP addresses when forwarding mail?

I host 2 web domains (domain1.com and domain2.com) on a CentOS 6.6 Linux server with 4 IP addresses. Postfix 2.6.6 accepts mails to info@domain1.com and info@domain2.com and forwards them to ...
5
votes
1answer
2k views

“kernel: Cannot read proc file system: 1 - Operation not permitted” — millions of such messages each minute in kern.log on OpenVZ VPS? [closed]

I'm seeing repeated never ending such messages in kern.log on my OpenVZ ubuntu 12.04 server. Mar 2 06:23:33 localhost kernel: Cannot read proc file system: 1 - Operation not permitted. Mar 2 ...
5
votes
1answer
2k views

Using Virtualization (vmware or virtualbox) to setup ipv6 network

So I'm working with a Windows 7 host and have both Virtualbox 4.0.10 and VMware Workstation 7.1.4 installed. I have been trying to create an IPv6 network that is host only to communicate between the ...
5
votes
3answers
3k views

XenServer Performance

we've got 2 x HP DL360 G5s with Quad Quad Xeons 2.6GHz and 32GB of memory each running XenServer 5.5 and they access an OpenFiler box (with 8 x 320GB SAS 10K drives) via copper CAT5 (1GB) for the ...
5
votes
5answers
8k views

Debian Squeeze Hyper-V Drivers

I have a fresh Debian 6.0.0 (Squeeze) server running on Hyper-V and I'm trying to get the synthetic drivers loaded into the kernel (2.6.32-5-amd64). The research I've done says that the Linux ...
5
votes
2answers
3k views

Is it possible to tell which cpus are hyperthreads of the same core?

I have a server that is a quad-core i-7 with hyperthreading enabled. The kernel recognises this as 8 cpus, as it should. I want to create a couple virtual hosts running on this machine. virt-manager ...
5
votes
4answers
2k views

Virtualization: 64-bit or 32-bit?

I'm going to install Ubuntu 10.04 Server in a virtual machine and want run MySQL and Lighttpd on it. Are there any benefits or disadvantages between 64-bit and 32-bit virtualization, except the 4 ...
5
votes
4answers
9k views

Is it possible to span one huge VM across several physical commodity servers?

Is it possible to span one huge Virtual Machine across several physical commodity servers? Here is our use case: We need to implement a 32-processor db server with 64 GB of RAM We don't have a ...
5
votes
3answers
2k views

server virtualization: hypervisor (xen) or virtualbox?

Hey guys! I just set up a debian server for websites but now I need to install a windows server on the same machine because I need to run a game server (windows-only). Virtualbox is already installed ...
5
votes
2answers
1k views

What is Ubuntu enterprise cloud?

If I install Ubuntu 10.04 Server, will it provide me with virtual machines which I can use to install different OSes? I need Debian Lenny on a VM for example. What facilities does it provide? Is it a ...
5
votes
1answer
4k views

Connecting to other instances of Hyper-V Manager in domain

I have a test environment that I host from my computer. I have configured an external switch so that it can be accessed by others. Windows 8 Enterprise and Hyper-V Manager Version: 6.2.9200.16384 If ...
5
votes
1answer
349 views

Benefits to private networks between virtual machines on an ESXi host?

I'm planning this development environment with a few database servers, and originally thought I would have a few private networks. I then thought it might be unnecessary as the ESXi cluster already ...
5
votes
1answer
3k views

Should we use irqbalance in a VMware guest?

Should we use irqbalance in a VMware guest? I'm very sure this benefits bare-metal installations on multi-processor systems. I'm rather unsure if this benefits VMware guests, even VMware ...
5
votes
1answer
2k views

Should I Use the Default SQL Server 2012 Accounts or Make Specific Ones?

I'm installing the 180 day trial of SQL Server 2012 on a virtual machine with the intent of buying a license for it later on. From past experiences with installing SQL Server I would always make ...
5
votes
1answer
5k views

Apache2 + Disable Default Virtual Server

This is the first time I actually try to setup a server myself. Everything is working good so far. I have added a new virtual server and changed my domain´s A records and it is now working as ...
5
votes
2answers
2k views

Move and clone VirtualBox machines with filesystem commands

I know of 2 ways to clone a VirtualBox machine on a linux host, one is by using the VirtualBox gui and exporting and re-importing as appliance (in the file menu of VirtualBox). The other is by ...
5
votes
1answer
3k views

What are EC2 Best Practices?

There's scant documentation on this topic. For example, the EBS initialization described in this page is an important first step for running a database on EC2: ...
5
votes
2answers
6k views

Backup of KVM guests when using qcow2 disk files

I got a Ubuntu (hardy) system used for virtualization using KVM. Each guest got it's own qcow2 file used as disk. Guests are running Ubuntu (hardy). What would a good backup strategy be for such a ...
5
votes
3answers
1k views

How to migrate VirtualBox 2 virtual computer to VmWare server2?

How to migrate VirtualBox 2 virtual computer (virtual drive) to VmWare Server 2? Computer itself runs Linux, virtual computers run Windows XP and Windows Vista. I need support for GRE protocol, which ...
5
votes
1answer
1k views

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

Azure seems 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 ...