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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Having different two different public IPs or Xen guests

I'm using XenServer and CentOS. I have successfully configured two Windows Server guests and they both work properly. On the host machine, I have xenbr0, xenbr0:0 and xenbr0:1 (for two different IP ...
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CentOS network bridging and Xen

I'm using CentOS 6 and Xen 4.6 on a bare metal machine. I'm trying to install ubuntu as a guest but I fail in the networking section. (I use netboot image). I have two eths named eth0 and eth1. ...
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Blank LVM partition after recovery. Where is the data?

colleagues! A few days ago, the logical volume has been removed from one machine. Today, it turned out that there were still important data. No problems, everyone knows vgcfgrestore. Found in the ...
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Virsh cannot connect to Xen server

I have installed the latest version of Xen server 6.5. Now I want to connect to it with virsh (libvirt-bin). When I do this I get the error error:end of file while reading data: sh:nc:command not ...
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What's the impact of a high cpu steal time on XenServer's dom0?

From what I understand, cpu steal time is the CPU time that the VM kernel requested, but was denied by the hypervisor because it was serving another VM. We have a XenServer that has dozens of VMs ...
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unrecognized usb passthrough to windows server 2012 r2 on ubuntu 16.04

I have a ubuntu 16.04 lts on a intel NUC machine. I want to use a TV usb tuner, in Japan, which only works for Windows. So, I'm trying to install a windows server 2012 r2 guest VM on the ubuntu ...
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29 views

Xen Server interference on ARP requests

I have a strange behaviour on my network as my unix-like hosts seem to have problems to reach the gateway. Digging into the network traffic via tcpdump, I've seen that two different hosts answer to ...
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Auto Power On Xenserver 6.5

After applying updates to my xenservers I noticed VM's that were turned off turned themselves on after the server I applied updates to rebooted. I do not have any vApps configured and I did not ...
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Can't find logical volume when booting imported disk images in Xen guest

I've got a couple of drives I copied over using ddrescue to image files for booting under Xen. They contain an LVM volume group with a couple of volumes in it, which was originally split across two ...
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50 views

Active/Active MultiPathIO to two HP d2700s?

Our XenServer 6.5 hosts connect over ethernet to shared SAS storage via a single Linux based HP DL360 G6 "bridge". This single StorageServer bridges ethernet to SAS and shares out via an iSCSI ...
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virsh (xen) not listing dom0 nor domU

I have Xen 4.4.2 installed on Ubuntu. xl list shows Dom0 and all DomU but virsh -c xen:/// list --all doesn't return anything. virsh version returns Compiled against library: libvirt 1.2.2 Using ...
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Xen migration - Error [backed has not unmapped grant]

I am trying to migrate between two servers running Xen version: 4.1.6.1 and Ubuntu 12.04.5 LTS. The problem I am currently having is when I migrate from: Server1 -> Server2 (with VNC I see this) ...
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Ping only works twice

I have created a vm inside a xen host. By following this guide, I have managed to ping www.google.com, but it only ping-pongs twice before getting Destination Host Unreachable. If I restart the vm, I ...
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Xen - VM not reflecting memory

I am using Xen to hot-add memory to virtual machines, but it seems that I am not getting the correct vales in /proc/meminfo on the guest. As displayed below the guest has 2 GB of allocated memory. ...
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How to recover XenServer vm's from a mdadm raid 1 HDD

I have an older server, namely, Fujitsu Siemens Primergy TX 150 S6 on witch i have installed XenServer 6.5.0-90233c. On it i have multiple virtual machines of different sizes of witch i need to ...
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Testing migration in vmware workstation

I have VMware Workstation 12 with two centOS guests installed, lets say C1 and C2. I am using Xen inside C1 and C2, lets say X1 and X2 respectively. I want to migrate vms from X1 to X2. I know this is ...
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Kali Linux under Xen

I've been trying to get Kali running as a guest dom, but so far the results have failed. My LVM is located at /dev/sdb --- Volume group --- VG Name vg0 System ID ...
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lvcreate reports disk full, vgdisplay says space still exists

I'm attempting to create some new lvm partitions for a Xen VM. The drives are already set up - running sudo vgdisplay give me the following: --- Volume group --- VG Name n3850a-vg0 ...
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XEN kernel, CPU missing flags?

I'm using Opteron 6386SE processor, 16 cores. It's capabilites (flags) are here: CPU World But when I run cat /proc/cpuinfo (dom0 or guest), flags are missing, for example SSE3 and SSE4. flags ...
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VNC not working on XEN/libvirt domU - debian jessie

Hi recently configured a brand new server for testing purpose: debian jessie (8.3) xen 4.4 (xl toolstack) virtinst I created and started a new domU through virt-install: virt-install \ ...
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Xen+Libvirt: How to use PVH mode with Libvirt?

PVH mode is an hybrid of PVHVM and PV modes, where you use both virtualization and paravirtualization techniques for improved guest performance. It's been introduced around Xen 4.4. I'm using Xen 4.6 ...
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102 views

Xen reduce VCPU

I am trying to reduce the number of VCPU on Dom0, but not understanding why its not reducing the number. Log: [2016-02-11 13:43:25 2550] INFO (XendDomainInfo:1977) Set VCPU count on domain Domain-0 ...
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30 views

Migrate Virtual Machine from KVM to Xen

I'm trying to migrate a Virtual Machine from Qemu KVM to Xen Hypervisor 4.1, but have problems with it. What is the best and simplest way to do it? What I've done so far: I have installed ...
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57 views

Verifying VT-D / IOMMU Support (VGA Passthrough)

I have a 4790K I'd like to use VT-D with for hardware acceleration in a Windows guest VM (Dom0 = Ubuntu 14.04) using Xen. Intel's website CLAIMS the processor supports this: "Intel® Virtualization ...
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Setting up bridge for domU to be accessed from external network(internet)

I am trying to setup virtual guests(PV) using xen 4.4 (xen-tools) on debian 8.3. Problem is that I fail to configure bridge properly I guess ^^. I have setup an interface xenbr0 that uses same IP ad ...
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Xen VGA passthrough w/ XEN_PCIDEV_BACKEND kernel option

Xen's webpage ( http://wiki.xenproject.org/wiki/Xen_VGA_Passthrough ) says this is a requirement for VGA passtrough: "dom0 Linux kernel needs "XEN_PCIDEV_BACKEND" option enabled." I'm running ...
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239 views

Running a Linux docker container inside a Windows Server provisioned through Xen on CentOS (Can it be done?)

How do you properly propagate VT-X through physical hardware into a server provisioned via Xen so that virtualized docker can be run inside the virtual Windows server? L0 is Xen running inside ...
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Xen domain windows 2012 r2 - cant add usb

I have xen 4.4.3-9.el6 on CentOS: 6.7 (Final) Problem is I cant add usb devices to my windows 2012R2 domain; If I usexm usb-add demo_win2012_r2 host:0529:0620: I can see my device in windows but it ...
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1answer
78 views

Handling /etc/fstab when upgrading linode from Xen to KVM

I have a linode that is currently on one of Linode's Xen servers. I see that I am eligible to upgrade to a KVM linode. One thing that concerns me is that Linode's upgrade guide says block devices ...
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Xen networking - dom0 receives ARP requests but no reachability

Both dom0 and domU are Debian 8. Dom0 network configuration is: auto xenbr0 iface xenbr0 inet manual bridge_ports eth1 bridge_stp off bridge_waitport 0 bridge_fd 0 auto xenbr0.4 ...
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XEN VPS wrong memory?

I ordered a VPS on XEN platform with 1 GB of memory. CentOS 6.6 uname -a Linux vps 2.6.32-504.23.4.el6.x86_64 #1 SMP Tue Jun 9 20:57:37 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux I checked the ...
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Unable to get a xen vnc console on centos7

On a xen Centos 7 domU, I am unable to get a vnc console on xvc0. According to the documentation I have seen, this should occur automatically. What I see is anything but - console stays on hvc0. ...
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181 views

Getting “Too many slots” messages on CentOS 7 running as a domU

I have some CentOS 7 guests (domU) running on some CentOS 5 + Xen 3.0 hosts (dom0). I'm seeing a lot of this in dmesg and /var/log/messages: Dec 11 13:33:50 appsrv01 kernel: net eth1: Too many ...
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Manage KVM and or XEN Server from Windows

I cant seem to find a way to mange my KVM and XEN Server from a Windows machine. Is there really no way except a remote desktop connection?
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Xen Vcpus State

hprvsr1 ~ # xl list Name ID Mem VCPUs State Time(s) Domain-0 0 1024 1 r----- 15.6 hprvsr1 ~ # xl ...
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OpenSUSE Xen installlation is not in Grub 2

I'm sorry if this is a duplicate but somehow serverfault search action didn't work with my browser. I have a functional recent OpenSUSE Tumbleweed installation and I want to turn it into a ...
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XenServer - Removing Blade Server from Chassis

I've got to remove one of our PowerEdge M620 blade servers from our M1000e Chassis server to look at the hardware on the server, mainly the mezzanine card installed. Will removing the blade server ...
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How can I track security issues with running kernel under paravirtualisation?

I've got a bunch of client's virtual machines running by various providers who use Xen paravirtualisation. Almost all of these are Debian or Debian based systems. I rely on APT pretty heavily to ...
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78 views

Enabling Nesting for Xen-in-Xen via Libvirt xml

I'm trying to get nested Xen-In-Xen via libvirt. Can someone confirm that adding hap and nestedhvm to the features element in the domU xml config is what is required to get nesting working? Am I ...
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KVM vs XEN PV - which might have higher Server Load [duplicate]

I am wondering KVM vs XEN PV which will create higher server load (From Host perspective). In simple words, if identical VM's ( Linux variant) runs on a KVM based node and XEN PV based node which ...
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131 views

Enable SNMP XenServer 6.5

I want to enable snmp on my servers running xenserver 6.5. I've found a few articles with instructions to do so and the whole process seems pretty straight forward but my question is this - is there ...
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99 views

Backing up Xen Guests from dom0 with disk image file

I have a Xen server dom0 with a number of guests installed and am struggling to find an easy way to manage backups from the dom0 side. Guest scripts: Of course I could run backup scripts on each of ...
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Shared storage for Xen based cluster that allows I/O control

I am looking for a solution that will allow me to control I/O usage for my home Xen based cluster. Basically what I need is a way to limit or scale domUs (VMs) disk throughput. E.g. setup: - VM1 ...
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Effects of Third Party tools on Hypervisor Performance

I am using XEN for managing and introspection of VM's. I used DRAKVUF for sake of introspection. XEN provide built in tools for managing VM's. But I want to use LibVIRT for management. I want to know ...
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Get direct block addresses - Sleuth kit - XEN

I am using sleuth kit library in order to write an introspection tool for XEN hypervisor and my question is if we have the inode number of a file on a disk [ guest VM - ext4 filesystem], for example ...
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Ubuntu LDAP and NFS directory permissions

I have an issue with NFS and directory permissions using LDAP. Users that are members of a certain group cannot access a directory owned by that group (it works fine without NFS). They can access ...
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wget only works when tcpdump is listening

I am running two Virtual Machines over the XEN hypervisor both with Ubuntu trusty (Linaro-Developer version) with the following simple bridge networking setup: Backend domain (dom0): br0 ...
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nat and xen, nat only to external ip

I've setup xen that way that all my vm's have a public ip and a private ip (192.168.0.x). However, those vms which don't have a puplic ip should also get internet access so I did setup nat. iptables ...
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Apply Hotfix/Update in Xen Center

I noticed that hotfix XS65ESP1013 was just issues for xenserver 6.5. I want to apply the update through Xen Center, NOT CLI. What are the proper steps for updating through xen center? I currently ...
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164 views

How to create bridged network interface for Xen?

I'm trying to use Xen on an Ubuntu server for the first time and have a really basic question. I'm following the guide in the Ubuntu docs and under the Network Configuration->Using bridge-utils ...