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 ...

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Removing snapshot after removing guest hard disc

I have a server with ESXi 5.5 installed. I recently wanted to add a new hard disk to one of the guests. After adding the virtual disk to it, I took a snapshot just to be sure that nothing would go ...
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22 views

Multicasting on guest Operating System

I have 6 guest Operating Systems (windows server 2008) on a vmware 9.0 My host OS is Windows 8.1, And GNS3 installed on the host OS, where I have my topology with 3 routers configure with multicast ...
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23 views

Network error when running multiple Virtual Boxes

I have a Ubuntu 14.04 physical desktop that's running some Virtual Box instances (also Ubuntu) through Vagrant. The Virtual Box instances are configured to use static ip and with "natdnshostresolver1" ...
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1answer
62 views

Is it possible to bridge/join two or more vritual (Hyper-V) switches with the same address range over VPN?

I have several Hyper-V servers which are not in the same LAN. On every server are several Hyper-V guest VMs which are connected via an internal virtual switch. Now I want to to connect these two ...
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1answer
51 views

live migration of a virtual machine to a different machine

I am trying to do live-migration using KVM (libvirt). VM is called host1 and dest. IP address is 10.81.1.9. However, running the following command gives me an error that I am not sure what this ...
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1answer
183 views

ESXi550-Update02 missing on host with Dell-ESXi-5.5U2-2068190-A00 Image

I recently deployed a new VMWare ESXi Host with the latest Dell-ESXi-5.5U2-2068190-A00 image. I've just scanned it with Update Manager and it says it has 4 patches available. However 2 of them are ...
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37 views

Is it possible to Create a local Virtual Machine (vmWare) from a remote Ubuntu 14.04 installation

I have a bunch of Ubuntu 14.04 machines hosted at a host using their CloudHosting VMWare packages. I have tried to download them but it's not supported. Is there any way to backup my servers and run ...
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2answers
79 views

How To Monitor And Alert For KVM Hypervisors

We have an environment where we are currently monitoring ~50 VM hosts running esxi. We easily get alerts for hardware events and exceeding performance thresholds via vcenter. We're planning on ...
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0answers
163 views

Virtualization-(Cluster) with KVM/libvirt on top of a FC SAN

I'd like to set up a 2-node HA-Cluster based on Ubuntu and KVM running about 30 VM's. Both nodes are connected to a HP MSA(5TB) via Fibre Channel. Multipathing's already working and the nodes are able ...
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1answer
244 views

Is it realistic to host ESXi on a cloud VPS?

We are striving to avoid any on-site infrastructure at our startup. A combination local and cloud-hosted virtual machines have been working for us so far, but now we need an ESXi host as well. ...
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2answers
42 views

Finding IP Of Remote Host Machine By IP Of Guest Machine

I am trying to find a way to figure out on which of the servers the virtual machine actually is residing. I know the ip of the virtual machine. It is in a bridged mode on the local network inside one ...
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57 views

Dealing/Fixing the Ploop issue with OpenVZ — relclaiming lost space

So OpenVZ Ploop has a bug where if users add then delete files the space becomes unclaimed and the disk eventually runs out of space. Now there is a script that fixes that(included below). However, ...
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1answer
105 views

Is there a way to connect VMWare Workstation / Fusion to non-esx Libvirtd-managed virtual machines?

I'm using KVM virtual machines managed through libvirtd server-side for most of my projects. On my desktop however, I'm using VMWare Fusion Professional which, just like its VMWare Workstation cousin, ...
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69 views

Restoring read only domain controller from VM checkpoint

I have several RODC on remote sites, and sometimes power failures corrupts ADDS database which takes some time to recover. I'd like to move RODC to virtual machine (on same server) to be able in case ...
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2answers
277 views

Guest networking not working on Debian Jessie Host server KVM with br0 bridged network

GUESTS networking not working at all. In other words guest can not ping host or lan gateway. I have br0 bridge already created, also brctl show that vnet0 was properly added by KVM to br0 on guest ...
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3answers
117 views

Cannot start Virtual Machine

I am trying to setup a Virtual Server using the Windows Server 2008 Hyper-V but each time, when I click start, after creating the Server, I get an error: An error occurred while attempting to start ...
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1answer
58 views

VMWare ESXi 4.1.0 - Checking SMART info [closed]

I'd like to know if there's a way to check the SMART info for hard drives on VMWare ESXi 4.1.0? Thank you.
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1answer
34 views

What's the difference between Jumpbox and Microsoft App-V?

My organisation has been using App-V to package deployments to users machines in a Windows environment. We're now evaluating Jumpbox as a replacement in this space. The great thing about App-V was ...
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1answer
132 views

Slow Performance on Exported Hyper-V VMs

I have an Windows Server 2012 environment with Hyper-V virtualization. My VMs were running very well but my machine was running low on disk space. After buying an new HDD and installing it on my ...
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2answers
40 views

Version control for virtual disk images

Is there any existing system for efficiently tracking the version history of a virtual disk image? Essentially, I have a disk image which is used as a "template" root filesystem for testing programs. ...
2
votes
1answer
350 views

When cloning a VMware Virtual Machine, how can I prevent MAC address conflicts?

I've run into the following problem on both VMware Fusion (for Macs) and with VMware ESXi/vSphere. Many of you are familiar with the problem, and it is described at VMware KB: "Networking does not ...
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0answers
61 views

KVM virtual IP address not working on HOST, works on GUEST

I have a setup composed of the following: -> A HOST running KVM with the following network configs: # The loopback network interface auto lo iface lo inet loopback # The primary network interface ...
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votes
1answer
41 views

Where to install XenCenter? [closed]

I am new to the XenServer (and server virtualization as well). I have setup successfully the XenCenter on my workstation and I can manage my hypervisors without any problems. I have read in multiple ...
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1answer
1k views

Hyper-V VM doesn't boot off SCSI hard drive

I've converted a VMWare VMDK to a VHDX. The guest is a Windows 8.1 VM. When this is attached to a generation-1 Hyper-V VM as an IDE drive, it boots up fine. When the same VHDX is attached to a ...
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0answers
82 views

how to design network for virtual machines with just one nic

for the past week or so i've been recovering from the shock that i have literally no idea how my isp's network works, by getting a new box and trying to do a sensible design from scratch. our design ...
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2answers
95 views

Virtualising a VERY legacy app

Looking for a bit of help on this one. I have a customer who has a VERY old MS DOS application that is written in some 3GL language of unknown origin. The original software vendor went out of business ...
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1answer
324 views

What is the recommended method to prepare Red Hat/CentOS 7 templates?

If I need to deploy Red Hat 7 from template, I would like to take the recommended steps to make my "golden image" clean. It should boot to the first boot prompt and guide the user through the typical ...
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votes
1answer
60 views

Does VMware ESx server run a operation system of its own to manage the the hardware(like a host OS) inside of VMware ESx server [closed]

Does VMWare ESXi software run a host operating system in itself (bare metal hypervisor). I know that the vSphere client is used to manage the VM's created inside of the server but what about the ...
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votes
1answer
56 views

Can I configure IO error proof Linux on virtualized environment? [closed]

I believe everyone who are working on virtualized environment like Xen has experienced some sort of IO problems which lead to read only mode for guest machine. We experience same issue couple of times ...
0
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1answer
35 views

Kerberos in production on virtual machines

At the moment I am investigating the possibility to use Kerberos as the primary authentication protocol for our cloud structure. We'll probably follow through with this idea and for the sake of HA the ...
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votes
2answers
63 views

How many websites per virtual machine? [duplicate]

We are currently hosting about 10 of our own various websites on a virtualised host. Each website is hosted by its own virtual machine with its own apache. Some of the sites connect to a shared ...
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votes
1answer
150 views

Why Linux guest VMs performs better than Windows ones in terms of network?

I am testing the network performance of VMs in Xen and Hyper-V using Iperf and Netperf. In both hypervisors I found a Linux guest VM in different modes is having a relatively high performance than a ...
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1answer
222 views

Backup and restore vCenter 5.5 in a Lab.

I need to take a copy of our production vCenter and run it in a lab for testing purposes. This part isn't my strong point.How do I go about this and is there any official documentation pertaining to ...
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0answers
46 views

Dynamips Virtual Router not pinging external host after bridging

I have setup a virtual router image with dynamips and setup bridging between tap0 interface of the virtual router and eth0 and br0 with commands [root@cisco_host]# brctl addbr br0 [root@cisco_host]# ...
0
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0answers
47 views

clonehd takes 2 hours for a 100GB disk. Expected?

I have a VirtualBox image using VDI and flexible size. Right now the physical DVI file 94GB. The host is an Ubuntu server and the guest is a CentOS 6.4 with ext4 partition. The host is using a sata ...
0
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1answer
418 views

How to speed up QEMU on Windows host?

We want to run our Ubuntu 64bit web server virtualized/emulated on a Windows 64bit host. Intended use is to distribute the VM to customers who might not have "elevated" or "admin" rights on the ...
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votes
1answer
67 views

Host CPID, Geast CPUID and UserCPUID / what are they?

i found out that there are some IDs associated to the CPUIDs in vmx file of each virtual machine, these IDs are; hostCPUID.{Num} hostCPUID.80000001 guestCPUID.{Num} guestCPUID.80000001 ...
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2answers
2k views

Cannot ping a VM from a Hyper-V host

I am facing a weird situation in my network environment. My infrastructure looks like this: I have a D-LINK DIR-635 acting as my default gateway (192.168.0.1) A physical Windows 2012 Server ...
0
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1answer
49 views

Virtual guest: NTP sync with host

Is there any way to get a virtual guest to only query it's current host for NTP? I'm not talking about configuring ntp.conf with the host's IP here either as VLAN's & firewalls may block that ...
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votes
1answer
49 views

Bochs and Bios Canonica VirtIO SCSI Disk Device running Windows 2008 R2

I have a Windows 2008 R2 server I can only remote this server so I need to know what type of virtual environment is hosted on, The Bio Manufacturer shows Bochs and hard disk shows: Canonica VirtIO ...
4
votes
4answers
81 views

Setting the noatime flag for filesystems inside an lxc container

My host filesystem is ext4 mounted with the noatime flag. But inside an lxc-container, the flag is absent. Here's the output of mount on the host: /dev/sdb1 on /home type ext4 (rw,noatime) And ...
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votes
1answer
131 views

Can you use CGroups inside an OpenVZ Container?

just a quick question, which i have had trouble finding the answer to: The OpenVZ Authors have been contributing a large amount of code to the linux kernel, in order to get virtualization features ...
1
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2answers
93 views

Migrating Hyper-V VM's to CentOS 6

I have tried to search this around in google, but I haven't actually found anyone migrating from Hyper-V (Windows) to CentOS 6, only the other way around. So, I was wondering if there are any pointers ...
1
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0answers
225 views

lxc command always “get error 4 in libc-2.12.so”

I've tried several time to find out why suddenly my LXC not working, I use dmesg | tail it shows: lxc-start[2777]: segfault at fffffffffffffffc ip 000000390347b82c sp 00007fffd9046c18 error 4 in ...
0
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1answer
50 views

How to add an existing encrypted vHDD to a new virtual machine?

I am using VMware workstation with encrypted virtual hdd-s. I tried to use one of the vmdk files as an hdd on another virtual machine, but when I try to add them as an existing disk, I get the ...
1
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2answers
543 views

Can PXE boot of Hyper-V VMs be disabled?

Hyper-V virtual machines have the ability to PXE boot. Obviously, PXE boot raises some security concerns. The problem is, unlike a typical physical machine's firmware, there isn't an obvious way to ...
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2answers
103 views

How to block a VM from accessing other machines on network - XenServer

This might be a little far fetched and might not be possible. I have a virtual machine that will have files on that I don't want people to be able to transfer off - they are allowed access, I just ...
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2answers
172 views

vSwap vs Burstable RAM for OpenVZ

What is the big difference between vSwap and Burstable RAM? Does vSwap create and cause I/O by using disk? I know SWAP will use the disk so is vSwap the same as swap just virtualized in the ...
1
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2answers
114 views

Xen PV, Xen HVM and KVM

Am I correct that you can boot up any operating system with either of these virtualization types as they act as a bare metal machine and compile your own kernel? I am looking to switch over from ...
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0answers
113 views

How do I get IPv6 packets to my KVM virtual machine?

My setup is: Debian Wheezy x64 on the host and on the guest. I am using a tun/tap setup to connect a virtual machine to the host. The KVM network options I use are: -net ...