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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How to get more I/O performance from Citrix XenServer?

I have a Citrix XenServer 6.1 installed on a HP Server (1x Intel Xeon E5630 @ 2.53GHz (4 cores, 8 threads, RAM: 752MB for dom0 and 55286MB for the guests). The server has 2 scsi mirrored disks and is ...
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1k views

Xen memory management on small server

I am currently running VMware vSphere 5 on a server I use for various projects. Mainly I use it for honing my skills with administration and running a few game servers. Recently I was considering a ...
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909 views

How to get HP ASM to work under Xen Hypervisor?

I have a HP DL560, currently running Debian Squeeze as dom0 on Xen Hypervisor, and the fans constantly run at 100%. In the past this wasn't a problem because I could install HP's ASM which includes ...
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1answer
102 views

Safely rebooting a machine

I've got a simple XenServer running here and it suddenly stopped responding (I don't know why, it just doesn't respond to anything, but let's put that aside). I think I need to reboot it, but this ...
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1answer
413 views

How to route the public ip of xen guest outside of host system?

I have an xen kernel installed in centos 5. In that xen kernel, i have decide to create the guest os with public ip for amanda backup server . But i cannot able access the guest os using public ip. ...
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A better inexpensive 2 node cluster

There is a Xen cluster that setup that I really like. It consists of 2 nodes (let's call them 1 and 2). Each node has 2 non-raided drives (A and B). A1 replicates to A2 through DRBD and B2 to B1. ...
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Physical to Virtual Xen on Debian Squeeze

I'm trying to migrate various services from a physical Debian Squeeze box to a number of para-virtualised Xen machines. This is my first venture into Xen, so I'm planning on doing this step by step: ...
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1answer
861 views

Compiling kernel from source (for Xen), do I use plain kernel?

My VPS host uses Xen, and instead of using its custom kernels I could use my own (with pv-grub), the sample kernel of which I had installed to test this was is the following, I am running Debian 6 ...
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526 views

Debian - corrupted GRUB

I have installed Xen on Debian following the official manual from debian.org. After that I runned grub-update and some time later removed Xen, including xen kernel. I runned grub-update one more time, ...
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1answer
875 views

Enlarging image disk space on an existing virtual server (centos 5 guest on centos 5 host - Xen)

Is it possible to increase the size of an existing virtual server image (centos 5 guest on centos 5 host - Xen)? I just installed a new guest, and found out that I did not assign enough storage to the ...
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3answers
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Oracle VM 2.2 nodes rebooting for no obvious reason

I have a simple four node Oracle VM environment. A management server running in vmware, a nfs server for shared storage and two Oracle VM servers running the actual hypervisor. For some reason the ...
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1answer
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DRBD/LVM/Xen Setup not re-syncing/updating

I have a problem with a HA Cluster running on CentOS 5.4 x86_64. Software used: DRBD 8 (kmod-drbd-xen-8.0.16-5.el5_3.x86_64 / drbd-8.0.16-5.el5.centos) Heartbeat LVM2 Xen 3.1.2 My DRBD ...
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1answer
829 views

xen managemenet gui tools

We have 2 physical server with 64gb ram 4 socket of quad 2 core RHEL 5.3 XEN install on top win2k3*8(8 server of win2k3) and win2008*4(4 server win2008) running is any tool at open source to manager ...
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2answers
731 views

Crashing HVM domain, what do I do?

My DomUs on a Xen 3.4 on an RHEL5 are crashing when too much memory is needed: (XEN) p2m_pod_demand_populate: Out of populate-on-demand memory! (XEN) domain_crash called from p2m.c:1091 (XEN) Domain ...
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2answers
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Debian Lenny as Xen domU fails to boot

here's the thing: I have Debian Lenny running Xen dom0, and I want to install another Debian Lenny as domU. I followed the guide at Debian Wiki to the letter. Installation goes fine until Debian ...
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Red Hat Kickstart: How do I Prevent partitioning?

Hey all, I'm currently working on a new virtualisation setup using Xen, and Centos for my workplace. We intend to deploy the domUs into LVM volumes. Currently, the only thing preventing this from ...
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415 views

bash: convert date from to unix timestamp changes timestamp

Running the following command at the xen-servers (either DOM0 or DOMU) at $company gives me a negativ number, on every other system zero (0) (even in my cygwin). date -d "1970-01-01T00:00:00" "+%s" ...
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Moving LVM volume group from one physical disk onto another

I'm an out-of-my-depth PHP developer who has to deal with the following sysadmin problem, pronto. We have an Ubuntu (Ubuntu 14.04.1 LTS) server run Xen (xen-hypervisor-4.4-amd64 4.4.0-0ubuntu5.1). ...
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3answers
2k 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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1answer
158 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 ...
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638 views

Xen VPS not reflecting the RAM upgrade using xm mem-set

I'm trying to upgrade RAM on a Xen VM without reboot. Although it looks working from the host node, the VM isn't picking up the upgraded memory. Upgrading from 756 MB to 1024 MB. Below are the ...
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807 views

How can I install a new xenserver dom0 kernel?

Since Citrix released the full source code to xenserver 6.2 I've been evaluating it. It's works very well, but there is only one problem that I haven't solved. Unfortunately, Citrix do not supply the ...
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646 views

Dom0 not forwarding to DomU

The situation: DomU: Debian SID /etc/network/interfaces auto eth0 iface eth0 inet static address x.x.x.55 gateway x.x.x.49 netmask 255.255.255.255 pointopoint x.x.x.49 Ping DomU -> x.x.x.49 ...
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1answer
366 views

Running commands on FreeBSD Live CD

I'm running FreeBSD 9.1-PRERELEASE on a vps running on XEN virtualization, I tried to update it to 9.1-RELEASE but mergemaster toasted my /etc/master.passwd and /etc/passwd so what i have now is a ...
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1answer
194 views

Access to WAN from one VLAN

i want to create a VLAN for 3 guest VMs. I already have it and every VM can ping each other, but the problem is that any guest CAN NOT have access to Internet Network configuration in Host machine # ...
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2answers
398 views

Randomly crashing Ubuntu 10.04 on multiple Xen VPS host instances

So we have Ubuntu 10.04 running - all 64 bit. Kernel 2.6.36 and 2.6.38-15 are having the same issues. Problem is random VPS servers are hanging. We have about 30 instances with this particular ...
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1answer
441 views

xen and libvirt bridge configuration

I have a Centos 5.5 server with Xen 3.2 and libvirt for virt-manager installed. Before installed libvirt I have the bridge configuration just like the documentation on Xen says: xenbr0, eth0 and ...
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Why is OOM killer hitting here

We have some VMs running kernel 2.26.26-2 under xen 4.0.3 with different CPU and RAM amounts and on some seeing almost random OOM events each rendering the VM unusable. Output is as follows, I have ...
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1answer
271 views

Windows Server 2003 guest on Xen frequently stops responding

I'm running a Windows Server 2003 guest instance in Xen 3.x. This DomU runs fine for a day or two, then stops responding — I don't get any network response, and I can no longer connect to Xen's VNC ...
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1answer
652 views

Apache gets stuck while “reading request” and PID takes 100% CPU

Recently, somewhat coinciding with some server upgrades (although there were a variety of things that changed), Apache started ending up with some of its processes stuck in the "reading request" ...
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Can I virtualize multiple hosts into one virtual system?

I have 5 computer systems in our small office. From my basic understanding of Virtualization technology, I think I can virtualize the 5 systems into one big virtual system. I wish to confirm this. ...
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2answers
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Dedicated memory for Xen dom0?

How to assing the dedicated memory for the xen host system dom0 permamently and how to preventing dom0 memory ballooning ? also what is the minimum memory need for the xen host dom0 when it as already ...
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804 views

Giving Virtual Machines in Xen their own IP Addresses

Installed Xen on a server at home, recently moved it to a data center. Worked fine with DHCP behind my router, with each virtual server and the dom0 getting its own IP address. At the data center, ...
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1answer
539 views

SLES 10 SP1 domU eth0 not up at boot

I have a SLES 10 SP1 domU on a SLES 11 SP1 dom0 for the purposes of a build server. After moving around some file systems, when I rebooted the domU, the networking no longer worked. When logging in ...
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1answer
446 views

Equivalent of xen capping in kvm

I have been using xen hypervisor. I use the credit scheduler and make use of capping in credit scheduler. Now I am migrating to KVM . Is there any good equivalent of that VM capping in kvm ? Any help ...
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Boot hanging on SELINUX?

SELINUX is disabled on this this machine (which is a CentOS instance under Xen) but the boot process gets to a point that mentions an audit and SELINUX and then hangs. Is it ever going to come back? ...
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273 views

Location of vm data on xen center

I can't find the vm data (metadata files, disk images) mounted anywhere on the xenserver server. Where is it located, and how can I reach it from dom0?
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Can I give a virtual machine a unique ID which is accessible from inside the VM?

I want to be able uniquely identify my virtual machines from inside the virtual machine. The problem is that in my setup I cannot use the MAC address for that. Is it possible to configure another ...
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3answers
894 views

Web-based Ajax Console for Xen DomU?

I tried rapidxen once. They provided a web-based ajax terminal webpage, which displays tty0 on the webpage and you can type command on that webpage. It interactive with domU in ajax way, the webpage ...
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2answers
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XEN Server VM Creation Error

Has anyone seen this before and this recently started occurring when a VM boots. 4/7/2011 11:53:08 AM Error: Starting VM 'Web Server 1' - INVALID_SOURCE - Unable to access a required file in the ...
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2answers
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Xen HVM guest has severe clock drift

I am seeing a very severe clock drift on my Xen HVM VPS, rented from a hosting provider, so I don't have access to the dom0 system. I continuously run ntpd, but the clock drifts by as much as 30 ...
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3answers
884 views

What's the Xen compatible VNC client for Mac OS X?

I have a VPS hosting account, and the hosting is offered by Xen, and controllable via VNC. I could connect to my machine with my iOS app, but couldn't with Finder on Mac OS X. Maybe there is an ...
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1answer
4k views

Disk IO causing high load on Xen/CentOS guest

Background I'm having serious issues with a xen based server, this is on the guest partition. It's a paravirtualized CentOS 5.5. I'm not sure if it's hardware or software related, or in between ...
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How to setup a fast VPN server

I am trying to set up a VPN that has a fast download speed. The server I have is a linux server and from there I can download 2 megabytes a second. At home I can also download with 2 megabytes a ...
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Comparison of Hyper-V, Hyper-V Server, VMware ESXi, Xen and Parallels Bare Metal (Community Wiki)

Can we use this question to collect information and the pros and cons of each of the above products? Specifically I am wondering whethere there is any sane reason to use Hyper-V (the role built into ...
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Can Xen be configured to dedicate only one port of a dual-port NIC to a domU?

I'm using CentOS 5.4 on my dom0 with a stock Xen kernel. I'm attempting to use the pciback module to hide some of the Ethernet ports from the host and reserve them for a domU I intend to use for a ...
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4answers
635 views

“xm save” fails on kernel.org domU with Xen 3.4.1

I've installed Xen 3.4.1 from source. Some of my paravirt domUs use the official XenLinux kernel (2.6.18) and some use the mainline kernel.org. When I run "xm save" on the kernel.org guests, the "xm ...
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915 views

Live Xen snapshotting?

If I use xm save domain dumpfile, this pretty much accomplishes what I want to do. However, this does cause some downtime, and I really don't want to close network connections or take the machine out ...
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3answers
549 views

Constantly varying download rate with a complex xen networking setup, why?

The network configuration in my Xen setup is the following: the dom0 has 3 network cards (eth0, eth1, eth2), 3 brigdes (xenbrE, xenbrI, xenbrD) and each brigde integrates the corresponding network ...
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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 ...