Xen is a hypervisor based virtualization. It supports x86, AMD64, IA64, ARM and other CPU types, and Linux, Windows, Solaris and *BSD guest operating systems.

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Kernel parameters mem and dom0_mem in XenServer 6.1

We are running XenServer 6.1 in production, and recently had OOM-killer fire and eventually take down one of our blades. I noticed that in the kernel logs from the oom-killer instance that it seemed ...
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3answers
1k views

All Xen domU LVM volumes corrupt after reboot

I'm running a Debian Squeeze dom0, and after rebooting it all 7 of my domUs have data corruption. Each is setup as ext3 partition directly on a separate lvm2 volume. None of the lvm volumes will mount;...
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3answers
16k views

Xen vs. VirtualBox under heavy load?

Which performs better under heavy CPU and memory usage on the virtual servers, Xen or VirtualBox?
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How can I create a new VM pointing to something other than a CD/DVD

I am new to XenServer and want to experiment with adding new virtual machines. I am running XenServer 6.1 and XenCenter. I have successfully created a new VM by burning a DVD and during the creation ...
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Stale NFS handle

I have several xen guest OSs that get their root file system from NFS. I changed /etc/network/interfaces on some of them (on the nfs server) and then rebooted them. Now I get lots of 'Stale NFS ...
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547 views

How do I get the system-serial-number for Xen Server?

I would like to find out how could I be able to retrieve the system-serial-number of virtual machines installed on Citrix XenServer. I had referred to http://stackoverflow.com/questions/15802876/how-...
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612 views

xen with image disk files (instead of LVM)

I am currently running virtualbox on linux to run some simple webserver linux hosts. This is because I like the portability and extra isolation security. Because the host (and guests) are Ubuntu, ...
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244 views

BUG message on xenserver 6.5 - bad memory?

Several times a day I receive the following error in /var/log/messages. The server hangs and requires a reboot to respond again: Feb 1 13:44:54 xenserver-abfuqvrs kernel: [35023.166776] BUG: unable ...
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23 views

Force the GPL/PV driver to a lower link speed

I'm running Xen 4.4.0 on Ubuntu 14.04. On this Dom0 I am running: 1 DomU Ubuntu 14.04 with Shorewall 1 DomU Windows Web Server 2008 R2 with GPL/PV drivers Both domUs connect to the same bridge ...
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162 views

No space to snapshot on xenserver - Catch 22 to move the VMs

I am trying to move some VMs from one Xenserver onto another one but am stuck in a catch 22 situation. I have 3 VMs running on this server all on one storage repository. I don't have space to snapshot ...
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6answers
1k views

Which CPU for XEN - LAMP testbed - Budget [closed]

Dear serverfault knowledgeables, im in a decision dilemma right now, which I can't resolve due to lack of hands on experience. I need to build a testbed for basically virtualizing a LAMP application (...
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2answers
9k views

export XenServer snapshot as file via console

I have created a snapshot of a Citrix XenServer virtual machine using XenCenter, and now I would like to save this snapshot as an *.xva file, just as if I right-click on the snapshot icon in XenCenter ...
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297 views

xen server windows template sysprep Autounattend

Got a Xen Server Template Windows 2008 R2, thats had alot of things already set (disk size, server manager disabled etc, etc) We spin up, windows patch host and re-run sysprep My question is, can ...
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1answer
979 views

Share IP from Xen (XCP) Dom0 to DomU

The situation: Xen Cloud Platform installed on a dedicated server. It is assigned a batch of IPs. I want to create a CentOS 6 VM (domU) that is running a WHM/Cpanel install, and has access to the ...
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1answer
578 views

framebuffer loads under Linux, but not Xen

I recently built a Debian "Wheezy" system, which booted via GRUB to a non-framebuffer console, printing Console: colour VGA+ 80x25 during boot. To /etc/default/grub I added GRUB_GFXMODE=1920x1200 ...
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1answer
58 views

enabling modules for a kernel

I have a KVM/XEN VPS and would like to enable the following modules: ipt_LOG ipt_multiport ipt_state ipt_limit ipt_recent ipt_owner iptable_nat tun/tap iptable_nat ipt_MASQUERADE ipt_POSTROUTING PPTP ...
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1answer
2k views

What is causing `skb rides the rocket` errors?

On one of our busy (virtual) Debian 6 servers we are seeing a lot of messages in the syslog like this: kernel: xen_netfront: xennet: skb rides the rocket: 19 slots We are seeing some connectivity ...
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2answers
275 views

Why do KVM needs Hardware Assisted support to install even Linux based OS

For XEN we dont need Hardware Assisted support for running linux os. But why do we need that for KVM for running even linux based os. Can Kvm be configured to support para virtualization. Edit: ...
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410 views

xenserver ISO library

I am trying to create ISO repository with this guide: http://kb.softescu.ro/server-administration/linux-server-administration/how-to-create-a-local-iso-storage-repository-on-citrix-xenserver/ ("Inside ...
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1answer
63 views

How to expose DomU's to router network?

I currently have a server connected to a router through a single NIC. The server has a running XEN setup with several DomU's. Everything seems to work fine, I can access internet from both Dom0 and ...
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2answers
6k views

Ubuntu on VPS becomes unresponsive: BUG: soft lockup - CPU#0 stuck for 22s

We have a VPS running Ubuntu, on Xen. The problem is this, about once a day, for about 20-50 minutes, at a random time, the server becomes completely unresponsive to the outside world. After this ...
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3answers
4k views

Which hypervisor to play nice with docker.io

I have been running several different virtualisation servers, (ESXi, XenServer, Proxmox/KVM) in the past. I am now in a position where I need to set up a new virtualisation environment that is ...
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2answers
1k views

xl create doesn't bring up console

I've tryed to run VM in Xen 4.2 using xl command (for what I get this should be standard toolstack, while xm is deprecated). In this case I've the following configuration file kernel = '/media/...
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Grub can't find Xen multiboot file

I am running Debian Wheezy on a software RAID 0 with LVM. I'm trying to get Xen to work but grub refuses to boot in it. I installed Xen by following the instructions here: http://wiki.debian.org/Xen ...
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1answer
333 views

Good Xen image repository? [closed]

Does anyone know of a good image repo for Xen, sort of like Appliance store for VmWare? Also something like sourceforge but for xen, with tools and such? I know there used to be jailbreak.org - which ...
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1answer
856 views

Xen 4.4 mixed routed/bridged network vm does not work

I have updated one of my servers from Xen 4.1.4 (Debian squeeze) to Xen 4.4.1 (Debian jessie). As xend/xm is deprecated I would like to use the xl tool kit with Xen 4.4.1. But now I have issues with ...
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3answers
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setting up Ubuntu 10.10 as paravirtualized guest in Xen on RHEL5 host - what kernel?

I've discovered the tool ubuntu-vm-builder, which I've installed and then invoked on an Ubuntu workstation as: sudo vmbuilder xen ubuntu --suite maverick --flavour virtual --arch amd64 --mem=512 --...
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1answer
20 views

Adding “VMs by Software Product” to XenCenter's view menu

XenCenter has a "VMs by Operating System" dropdown menu. I would like to have a similar menu "VMs by Software Product" which displays VMs grouped by certain software products and releases. Each of ...
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1answer
927 views

Ubuntu 10.04 (LTS) DomU on Debian Wheezy Dom0 Xen 4

I have been forced to move from a Centos Dom0 xen 3 Centos + Ubuntu Lucid DomUs To Debian Wheezy Dom0 Xen 4 Ubuntu Lucid DomUs However although I can create new DomUs on wheezy I cannot ...
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49 views

Difficulty sharing physical ethernet device with Xen 4.4

I have a virtualized PowerEdge T320, with a Ubuntu Server 14.04 running Xen 4.4 as host, that I use at my lab to do scientific computations (I'm the admin of the machine). This server has two physical ...
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174 views

External USB drive on xen windows guest

I have an external USB 2Tb drive I'm trying to use with a xen guest. Xen Center 6.1 sees the drive in the removable storage repository and I can assign it to a guest. But the guest (tested Server-...
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1answer
116 views

Openstack Single Physical Network

I am trying to deploy openstack grizzly on a 12 node cluster. I want to use the xen hypervisor. I currently have xenserver installed, and I have 3 virtual machines running Ubuntu 12.04 to use for the ...
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2answers
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Running KVM/XEN/Hyper-V VMs from a RAM disk, is this possible? Practical?

Currently I'm using ESX (v3 and v4) to test a scripted OS (Windows 2003) and application install DVD. The DVD ISO (8GB) is mounted on a 1Gbps NFS datastore and the VMDK's (20GB) are on an SSD mounted ...
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Xen VM could not be installed

I have rented a server from Hetzner. I have installed Xen on Dom 0 - Centos 6.5. I couldn't create a Dom1 Centos 6.5 VM. The Error I see is 'Unable to retrieve 'the link for centos image' while ...
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4answers
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Boot Clonezilla with XenServer VM

I'm currently trying to move a RHEL based server to Citrix XenServer (5.6) VM. My plan was to use Clonezilla LIVE CD, which i have had good suceess with to clone physical to physical before. So i ...
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1answer
139 views

Can no longer add VMs on Xen/DRBD/Pacemaker Cluster

OS: Debian 7.3 & 7.6 Problem: Every attempt to manipulate (create, migrate or even list) the VM's with virsh causes this "Failed to get host power capabilities" warning. I manage a standalone ...
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1answer
107 views

How to know the real amount of RAM in a VPS

I've been told that a VPS's RAM can be manipulated (oversold) by VPS providers. I know I can always buy a VPS from a reputable company, but, really, how can one make sure the allocated memory is the ...
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1answer
914 views

Xen: can't get Dom0 and the DomUs to ping eachother

We have installed a Xen (4.1) configuration and can't get Dom0 and the DomUs to communicate (ping eachother). The DomUs are able to ping eachother but not Dom0, and Dom0 cannot ping the DomUs. We ...
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788 views

Cannot create windows HVM with SDL in xen 4.4.1

I want to create a win HVM, and set sdl=1. I was able to do so. But after I upgraded to xen-4.4.1, I got this error libxl: error: libxl_dm.c:1371:device_model_spawn_outcome: domain 4 device model: ...
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1answer
78 views

Xen cannot see all the LUNs in ISCSI HP StorageWorks MSA2312i Dual Controller Modular Smart Array

I have a HP StorageWorks MSA2312i Dual Controller Modular Smart Array and a second enclosure. I have four vdisks: vd01 (RAID5) (Current Owner A) vd02 (RAID5) (Current Owner B) vd03 (RAID10) (...
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1answer
844 views

host only network xen 4.4

I have one IP address (ipv4) and I am trying to install a domU (debian stable) on a dom0 which runs the latest xen 4.4.1 on debian testing. I have created xenbr0 bridge and it is mapped to my eth0. ...
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1answer
846 views

Xen guest - cannot get network connection beyond the host

I've just installed a XenServer 6.1. It came with a standard configuration, network 0 connected to NIC 0. I created a VM but I can't reach any network beyond the host. From the VM (172.18.32.20), I ...
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1answer
205 views

XEN virtual machine with IPv6 but without IPv4

How should I create a new virtual machine using xen-create-image if I just got the IPv6 from my hoster? When I tried xen-create-image --hostname=s1.example.com --size=70Gb --swap=8Gb --memory=...
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1answer
125 views

create parition for xen with lvm on raid-1

First I don't have any experience creating xen, lvm and RAID-1 server, thus after several reading I stumbled upon this ubuntu documentation to install xen. BUT, because in the documentation it doesn'...
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1answer
69 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
5k views

Xen lvm resize2fs: Bad magic number in super-block

First of all i have to say i've been looking through lots of posts very similar to what i have but none could solve my problem... In my xen server i use 5 lvm disks per virtual machine: /boot / /...
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1answer
71 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 ...
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0answers
378 views

Weird Phusion+nginx spawning delay error

We are trying to migrate an application written on REE from cloud provider A to cloud provider B. The application code, VM specs and operating systems are the same. The basic difference is that cloud ...
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1answer
419 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
191 views

Xm setup on SunFire X4200

I'm trying to set a Xen VM on a SunFire X4200. I'm using Debian Wheezy and have followed this guide https://wiki.debian.org/Xen which I used in previous attempts on different servers and worked ...