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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19 views

Removing Mdadm raid system and boot with a single disk

I have a linux system running a RAID 1 (MDADM) system. For virtualisation purpose, i need to remove this system of RAID and then boot again the machine with just the main hard disk. Now.. I am not ...
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6 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]# ...
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28 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 ...
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46 views

CentOS Host KVM Virtual Machine running a Windows VM - No internet access

I've installed a KVM virtual machine on a CentOS host using libvirt. I've also set up a bridged connection from the interface en0:4 running on IP x.x.x.15 to br0. (The IP is a public one). Running ...
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23 views

Openstack: Starting multiple shutoff intances

I am using Openstack Icehouse running on Ubuntu. After rebooting Compute node all instances that were running there will be in shutoff state. Is there way to restart them all at once? Only thing I ...
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36 views

Error while booting VMDK in VMWare Player; UNMOUNTABLE_BOOT_VOLUME

Hi all and thanks in advance for taking the time to read this. My employer has provided me with three VMDK files, each representing a different hard drive of a VM. My aim is to get these converted to ...
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10 views

Are Xen 4.1 virtual machines compatible with XCP?

I have a couple of vm installed with Xen 4.1 (basic Xen Hypervisor), now I would like to install XCP packages on my wheezy server. I've read that XCP took control of the server disks and network ...
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62 views

KVM : VMs need several restarts to boot (on 2 different hosts)

I'm using a KVM hypervisor on a Ubuntu Server 12.04 server. My virtual machine's virtual disks are LVM volumes, formatted as ext3. The guest OSes are all Ubuntu 12.04 and 14.04 server. Everything ...
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86 views

Kickstart “Unable to download kickstart file. Check parameter”

So I'm using 2 VMs (CentOS 6.0), one acting as a build server, the other is a new server I'm trying to build with a kickstart. When I start the VM for the new server (with the build server already ...
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21 views

Boot to last VM status on XenServer reboot

I have a Citrix XenServer 6.2 on a non-prod enviroment, which means that could be affected by power outages from time to time. This server has a lot of VMs, some of them are power on and other not. ...
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296 views

ESXi 5.1 SCSI and NMP Errors Filling vmkernel.log

On a group of ESXi 5.1 systems, I am seeing the following errors every 5 minutes or so: 2014-04-04T11:22:45.374Z cpu1:8193)NMP: nmp_ThrottleLogForDevice:2319: Cmd 0x1a (0x4124022be3c0, 0) to dev ...
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49 views

Xenserver firewall consideration

We are setting up Xenserver for a production environment with seperate VMs for a website, billing, control panel, mail. My question is, should we rely on each server's IPtables or is it necessary to ...
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26 views

Jumphost VM not able to communicate with LAN

I have setup a jumphost VM on WinXP. It has 2 NICs. NIC1, which is the LAN, has the following IP settings: IP: 10.0.0.1 /24 (No default/ DNS configured) NIC2, which has external connections, has ...
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38 views

How does Xen resize VMs without shutting them down?

I'm experimenting with Xen on a spare machine and I noticed that it can resize the RAM and CPU allocations of my VMs without shutting them down first. VirtualBox, VMware Fusion, etc. can't do the same ...
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112 views

How do you migrate kvm guests from virtualizor to solusvm ?

I have a server that until recently had virtualizor in standard setup (and hosted a few guests - all kvm) / 200 Gb /vg_guests - 3.4 Tb Recently i stopped and disabled virtualizor services and ...
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15 views

How can I see which Xen guests are using which cpu pools?

xm cpupool-list will show how many domains are on each cpupool xm cpupool-migrate will move a domain to a different pool But I can't find a command to show which cpupool a domain is using, or which ...
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54 views

Xen (SolusVM): Guest Windows partition is not auto-allocating free space

We are creating guest VM on Windows Server 2008 from the template we've built before but when we are giving our guest VM more disk space from the beginning it's not auto allocating that space. So when ...
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24 views

Automated hostname availability for OpenVZ environments

for several years now I am administrating some OpenVZ Hardwarenodes with a fairly low amount of containers per node (10-20). I'm about to setup a new machine, and what's always bothering me is the ...
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77 views

How to diagnose sporadic performance issues?

I have a web application with very varying response times and can't find out what causes that. That's the (quite complicated) setup: Powerful (i7, 32GB RAM) dedicated server in a German data center, ...
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238 views

XenServer open vSwitch performance downgrade

I'm trying to capture part of an inter hypervisor traffic between 2 virtual machines running over XenServer 6.2. I want to mirror some TCP sessions to a 3rd virtual machine with minimum affect to the ...
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34 views

How to benchmark a whole storage infrastructure

I'm a 100% sure that I'm not the first one to consider benchmarking a whole infrastructure, but yet I haven't found any relevant information on how to face this challenge. As I guess we all know what ...
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183 views

Azure VPN shows connecting but I can ping/rdp from local network

I set up a virtual network on Azure and connected it with Site to Site VPN to my local network. I am able to ping and RDP to the VM's in Azure from my local network. The problem is that the VPN ...
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333 views

Dell 12G R720 Hyper-V host virtual/physical NIC stops working

On the host 1 physical adapter is plugged into our network, on host itself I have Hyper-V role. I have created a external switch and binded it to the physical Broadcom NetXtreme Gigabit Ethernet, box ...
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91 views

macvlan on host, macvtap guest, routing via host gives error

I have a setup on CentOS 6.5 Host configuration: macvlan0-> 10.0.0.2/24 ppp0 -> connected to the internet Guest configuration macvtap0-> 10.0.0.4/24 gateway -> 10.0.0.2 Other host ...
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11 views

Vsphere Error OS X Console, Already modified wrapper.conf

I was able to view the console on the vSphere appliance in all three OS X browsers. Can't seem to do it any more, just get a can not connect error. Has anything changed in the last few days? I have ...
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491 views

Citrix XenApp FOSS Alternative

I'm looking for some Free and OpenSource Alternative to Citrix XenApp. I need to serve some Apps to Linux boxes from a Windows host. I've came across Ulteo OVD but it lacks Native Clients and Seamless ...
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27 views

vzpid equivalent for LXC?

I've recently migrated my containers from OpenVZ to LXC as OpenVZ support was dropped from Debian Wheezy. I used a command called vzpid on the host machine that identified from which container the ...
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76 views

Bridged network on OS X only gets UDP broadcast traffic

I've created a bridged network Mac OS X 10.8.5 using ifconfig and TUNTAP for OS X to bridge my wireless connection, en0, with a virtual interface, tap0, which I can use for guest VMs: $ sudo ...
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92 views

Proxmox “File Does Not Exist” Error

Something happened to my Proxmox server and now some VMs won't boot. When I try to boot one in particular, I get the message: proxmox:~# qm start 103 volume 'Backups:103/vm-103-disk-1.raw' ...
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76 views

opensm reports - Invalid requested MGID. What does it mean?

I've been working on a virtualized SR-IOV infiniband interface under Xen. If I run the OpenSM daemon under Dom0 IPoIB appears to work in the passed through VF. However, opensm starts using a lot of ...
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59 views

Hyper-v takes a long time to create snapshots

I'm not sure when, but I've noticed as of recently, whenever I go to make a snapshot of certain machines, it hangs at 2% for a good while and then eventually finishes (fairly quickly, actually). I ...
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65 views

How to detect on Linux that given MAC (HWaddr) is a virtual MAC and will change after rebooting?

Is it possible on Linux to detect automatically that given MAC (HWaddr in ifconfig output) is a virtual MAC and will change after rebooting. or alternatively is there a way to detect virtual network ...
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481 views

XenServer giving bridge access to guest using Private Network

I have two networks configured in XenServer 6.2: Production - Private Network Management - Private Network For each guest, I have two NIC's, one per network. None of the guests should have ...
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81 views

Guest machine can't access internet

I've installed kvm, libvirt and virt-manager suite to configure and install virtuals machines. All work fine (virtual machine managing, vnc) but my virtual machine can't access internet. Virtual ...
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127 views

Qemu virtio-net extra networking interface

I have a qemu debian guest that is being launched with the following command. qemu-system-x86_64 -boot order=c -drive file=image.img,if=virtio -enable-kvm -netdev ...
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158 views

Hyper-V: Ubuntu guests running out of memory

We appear to have a problem with Ubuntu guests running out of memory. We have several on 12.04 (LTS) and one on 13.04 and seem to have the same problem. It takes around 30 days from restart to ...
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38 views

how to programatically create an ubuntu vm

I have to create an ubuntu virtual machine within kvm/libvirt with a specific configuration for a specific set of tasks. I want to do it in a programmatic and reproducible way. I checked out ...
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148 views

Why does Xen fail to create domUs/start the virtual network interface?

I have received two errors while trying to create a new domU on Xen. First, I received this error: Unable to complete install: 'POST operation failed: xend_post: error from xen daemon: (xend.err ...
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52 views

How can I virtualize a running server but exclude directories so the resulting image is smaller than the drive

Following situation: There is a Ubuntu 10.10 Server running with many custom configurations and programs (can't set it up from scratch). One of these programs stores a lot of data (> 1TB) in ...
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158 views

Can't reproduce arp non-response issue with spoofed packets

I'm trying to debug an issue involving a KVM virtual machine instance where the instance doesn't respond to network requests when the source is on another physical machine, which is on the same subnet ...
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97 views

Converting Physical machine to Hyper V VM

I'm running a Physical machine with Windows 7 Ultimate mainly as a file server with 2 hard drives with all the file content stored on D drive with C mainly for OS. This file server is accessible by ...
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103 views

how to carp two interfaces on same node?

I have this CentOS machine with 2 interfaces. eth0--> br0 (.10) eth1--> br1 (.11) Although part of the same network, each interface is being fed from a different switch. I use each bridge in ...
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2k views

VNC faster than Spice for remote access to KVM guest?

Having used RDP before, I'm not exactly thrilled with the performance I am seeing from VNC to my KVM virtual machines. The KVM host is Ubuntu 12.04 server x64. I've read that Spice is faster, and ...
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1k views

Unable to SSH into ESXi 4.1 host - “Access Denied”

I am unable to SSH into an existing ESXi server. I have a user which is in the "root" and "users" group and is able to connect via vSphere. However after enabling "Remote support (SSH)", attempting to ...
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174 views

Creating a Scientific Linux KVM virtual machine over FTP causes errors from Virt-manager

so currently I am attempting to create a new KVM virtual machine using Virt-manager. I've extracted the .iso of Scientific Linux into the root folder of vsFTP I've set up with anonymous access. When ...
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146 views

KVM VPS doesn't reply to all ping requests and loading slow

I have a KVM VPS with qcow2 + IDE Bus + Not Preallocated Disk and default network interface (no virtio). site is loading so slow and about 40% of ping replys are Time out. I have CSF installed and ...
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62 views

Debian virtual server hangs on reboot, need help debugging

I'm admin of a Debian 6 virtual server. I've been trying to diagnose this problem for a while but haven't gotten anything. The server hangs every time I want to reboot it. All services seem to be ...
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580 views

How do I create a tap network bridge between my VM and host machine?

I've created a VM image via vmbuilder. I've been trying to configure the VM to be able to network with the host machine as well as the outside router. I've been following the directions here and here ...
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324 views

What is causing this EXE to hang (intermittently) on Citrix Desktop sessions?

We have a small executable that does 2 things: Read a value from the Registry Launch a URL in Internet Explorer I don't have access to the source for the exe to see what it is doing exactly. ...
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100 views

domU networking is better than dom0

I am using a 2.6.35 domU guest on a 2.6.32 dom0 and a 4.0.1 Xen hypervisor. Using netperf with UDP_RR I get 1819 and 622 transaction per second for domU and dom0 respectively, but in UDP_STREAM test ...