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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1answer
142 views

xm re-create configuration file from existing vm

I have Xen set up and working quite nicely. When I reboot and use: xm list I get this output: Name ID Mem VCPUs State Time(s) Domain-0 ...
2
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1answer
279 views

SAN: is it better to have separate LUNs for operating system and data of virtual machines? [closed]

We have an iSCSI SAN that will be used as backing store for virtual machines. We use Xen and will directly present the LUNs as block devices of VMs (so there is no file system with files on it for ...
1
vote
1answer
537 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 ...
0
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1answer
889 views

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 ...
0
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1answer
240 views

No traffic to Xen vif attached to Openvswitch

I'm trying to get my guest VMs to use an openvswitch on Ubuntu 12.04 with 3.8.0-26-generic. I've compiled the most recent stable build Xen 4.3.0 but can only get my guest VMs working with a standard ...
0
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1answer
36 views

Multiple VMs mounting and writing on the same partition

I have multiple VMs ( XEN domains ) which are getting data and writing it on a directory in a ext4 partition. Is this going to introduce data loss or corruption?
4
votes
4answers
337 views

Allocated Memory difference in xen guests with Linux 2.6.18 and 2.6.32

Can some one explain me why there is difference in available memory on Guests with same configuration: Hypervisor:xen 4.2 64 bit VM1: Centos 5.7 with 2.6.18-274.el5xen, Assigned memory from xen is ...
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0answers
51 views

Obtain the free_memory value in xen

I would like to know if there's an alternative to the command I am currently using to get the real free memory for the system (meaning memory that can be assigned to new domU) xm info | grep ...
0
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1answer
243 views

Enable promiscuous mode on Libvirt vif

Does anyone know how to enable promiscuous mode on a libvirt vif? I have a bridge with 3 vifs connected to it. I need one of these vifs to be able to sniff all the traffic flowing through the bridge. ...
1
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2answers
2k views

How do I configure Xen's virtualization of interfaces (eth0 to peth0)?

I installed Xen a while ago but had not yet booted up with the hypervisor. Well I did yesterday and all hell broke loose. I completely lost internet connectivity on my server because of Xen. When I ...
0
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2answers
2k views

IPv6: ADDRCONF(NETDEV_UP): eth2: link is not ready & IPv6: ADDRCONF(NETDEV_UP): xenbr2: link is not ready on Ubuntu Server - Xen bridge

Hi all, I am having some problems getting a Xen bridge up in Ubuntu precise with Xen. I created a first bridge on eth1 with no problems, but the exact same process for eth2 yields the following ...
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2answers
362 views

How create partitions with custom layout in VM on Xen Server?

We use XenServer with RAID 0, as one disk only (I wonder if this is a good approach, if not what would be ?), then we install Xen. After that we put the centOS 6.4 x64 DVD in the server and try to ...
1
vote
1answer
392 views

xen + debian network after upgrade squeeze to wheeze

I've got a Debian + Xen server. After a system upgrade to the stable version the network doesn't come up after boot. Every time after reboot I need to bring it up manually. The network configuration ...
1
vote
2answers
254 views

Xen Networking - Separating Dom0 from DomU

I'm having some issues regarding Xen Networking and I was wondering if you could point me in the right direction. I have a server with 2 NICS (Xen over Ubuntu Server - Xen Bridge scripts) Each NIC ...
0
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1answer
73 views

Xen dom0 and domu ifconfig returns different stats

I expected that when I use ifconfig command to display network traffic RX and TX values both for dom0 and domu machine, there are differences. I run once ping inside the domu. domu ifconfig command ...
3
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0answers
147 views

Network filtering with libvirt + xen + bridge + nat?

How can I properly add basic network filters (clean-traffic or, at least, ip-spoofing prevention) to XEN (xend) guests managed by libvirt? Or, in particular, can I manually execute libvirt's ...
0
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1answer
198 views

After running for approx. 2 days, IIS FTP refuses to connect

Background: Windows Server 2008 R2 64 bit, running inside Xen 6.1. Updated to the latest Xen Citrix Tools for Windows. Disabled IPv6. Currently trying to resolve the following: IIS FTP server ...
4
votes
2answers
297 views

Why is domU faster than dom0 on IO?

I have installed debian 7 on a physical machine. This is the configuration of the machine: 3 hard drives using RAID 5 Strip element size: 1M Read policy: Adaptive read ahead Write policy: Write ...
17
votes
4answers
1k views

What are the benefits of “enterprise-level” virtualization?

For a company with modest virtualization needs - VirtualBox is currently doing fine at hosting a few light servers - what would some of the benefits be of moving to a more robust platform? I'm ...
0
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1answer
404 views

Xen.org Master/Slave in a pool with HA-Lizard

I have a pool of 3 servers with XCP only, each with 1 VM running on them, and managing them through XenCenter. Since the opensource version of xen does not have support for HA, I am using HA-lizard, ...
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0answers
68 views

Xen Debian VM and NFS

I have 2 servers in a pool running a single VM on each server. I just got xencenter running so I am managing through that. I want to have a shared storage (NFS) between the two of them, so that if one ...
1
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1answer
347 views

RAID1 LVM, XEN and flashcache

I am regarding to question: Improving IO with FlashCache I have setup a RAID1 (/dev/md0) LVM (*/dev/vg_xen*) and executed following command: flashcache_create -p thru flashcache0 /dev/sdc /dev/md0 ...
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2answers
2k views

Determine which guest is running on XEN: HVM or PV guest

I'm working with a Xen host which is installed XenServer from Citrix by someone. He already installed a lot of CentOS 5.2 guests on the host. I wonder how to check those guests to know they are PV ...
0
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1answer
176 views

Xen hvc0 console size

Hello I got a Xen running using hvc0 for the guests. Everything works fine except for the size (lines and rows) of the console: It's always 80x25 what makes editing awkward sometimes. If the line one ...
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0answers
175 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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0answers
65 views

How to move a template from one xen nfs storage repository to another?

I have a bunch of templates on an NFS XCP 1.6 storage repository using thin provisioning for some of my VMs. I want to move the template's disks to a different NFS storage repository. There doesn't ...
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2answers
1k views

Xen: synchronizing time with Dom0

I have Xen virtual machines running on Debian 6 (both Dom0 and DomU). I would like to synchronize clock on DomU with Dom0. On http://wiki.xen.org/wiki/Xen_FAQ_DomU I have read that I need to set ...
0
votes
1answer
84 views

Add OpenStack Compute to existing Xen based server

I have an existing server running Cenos 6.x with Xen 4.x and a dozen or so virtual machines. I'm building out an OpenStack environment and was wondering if is possible to install OpenStack compute on ...
0
votes
1answer
508 views

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 ...
1
vote
1answer
763 views

Creation of Xen VM fails with Error: Creating domain failed: name=buildbox03

Since a few hours, my xen VM does not want to be created. The VM is quite unstable so I need to destroy and create is quite often. This morning I was able to do such a destroy-create cycle. A few ...
1
vote
1answer
1k views

Cannot change date/time on virtualized centos install without a reboot

I have a dedicated web server which is running centos with xen virtualization that has centos installed on the vm. I do not have access to the parent server, I can only manipulate the vm, of which I ...
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0answers
40 views

Optimize monothreaded application under XEN

I have an single threaded application who uses 100% cpu on virtual machine under XEN. Adding more VCPU will not help. Is it possible to configure XEN VCPU in order to have better performance with ...
1
vote
2answers
379 views

fix kernel on Xen Server hypervisor vps

I have a cloud server hosted at Rackspace, and they use Xen Server hypervisor. I was running Ubuntu 12.04, and really messed up by attempting to do a release upgrade manually. The hypervisor ...
0
votes
1answer
211 views

XenServer xe CLI on OSX [closed]

Is there a port of the XenServer/XCP xe command-line tool to Mac OS X? Or, alternately, if this tool is open-source, what's the easiest way to get access to the source?
1
vote
1answer
391 views

Booting Ubuntu 12.10 guest on Debian 6.0.4 Xen with pygrub

I'm trying to run a Ubuntu 12.10 off a Debian 6.0.4 and Xen-4.0. I realised that pygrub might not be able to parse the menu.lst (I symlinked menu.lst to grub.cfg in /boot) and ended up with this ...
1
vote
1answer
71 views

Centos install in Xen problems

I'm running ubuntu 12.04.1, and I want to install CentOS 5 or 6 using network installation via http. Using xen images from http://mirror.centos.org/centos/5.7/os/x86_64/images/xen/ my config: ...
0
votes
0answers
201 views

nagios volatile service and system time change warning

I have a nagios service with volatile option on (executes event handler every time it encounters a non-ok hard state). Problem is that if the event handler executes for 2-3 times (that is the expected ...
0
votes
2answers
723 views

Strange Ubuntu boot up warning

I have a VM (Xen based), I can boot up the machine but there are some warning during the boot up. Are they normal? If not, how to solved? md: Scanned 0 and added 0 devices. ...
0
votes
1answer
117 views

Split management network from data in Xen Server

I'm working on configuring our existing pool of four hypervisors running XenServer 6.1 to use a separate management network. Currently the setup is a single link with a public address over which all ...
1
vote
1answer
249 views

Changing the mac address in a libvirt xml config file breaks network connectivity for the guest

I'm using Xen with libvirt and trying to set it up on a bridged interface. I am able to install an OS and everything works as I would expect. If I save the xml output from "virsh dumpxml guest", edit ...
1
vote
1answer
178 views

Network traffic is not being forwarded from a VM to the network using a bridged interface with Xen + libvirt

I'm having trouble getting network access from a VM that I'm running using Xen and libvirt. I've been trying different things and reading similar posts online for a couple of days but I'm really stuck ...
2
votes
2answers
8k views

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 ...
2
votes
3answers
898 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 ...
1
vote
2answers
82 views

mount a partition on an lvm partition

I have a xen dom0 server (named virtserver), which contains a guest machine, let's call it "virtguest". The virtguest used to be a physical machine earlier, and the whole old disk (with several ...
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0answers
280 views

Xen hangs on boot when scrubbing RAM

I have a CentOS 5 server I can boot into the stock kernel just fine, but when I try kernel-xen, it gets stuck here: http://i.stack.imgur.com/wAI20.png When I try adding no-bootscrub to the kernel ...
-1
votes
1answer
130 views

Error: Cannot find ramdisk “hd(0)/boot/grub/menu.lst”

I have a dom0 and try to run domU with config like this: kernel = '/root/xen/dist/install/usr/local/lib/xen/boot/pv-grub-x86_32.gz' ramdisk = 'hd(0)/boot/grub/menu.lst' vcpus = '2' ...
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vote
2answers
185 views

Does Xen need an XServer for graphical display?

I'm trying to create a very small ISO, which is bootable and brings up a DomU such as Windows 7 using Xen. I want to setup the minimal number of packages in the small ISO, therefore I'm wondering if ...
4
votes
1answer
4k views

Can I safely uninstall “Citrix Tools for Virtual Machines”?

Having several virtual servers with Windows 2008 R2 at our web hoster (Germany's "1&1", they seem to use Citrix Xen), I have every now and then some servers that hang (RDP login screen hangs ...
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0answers
1k views

Nagios: check services being orphaned?

Recently I noticed that there are some warnings in the nagios.log: [1366060611] Warning: The check of service 'pt-deadlock-logger' on host 'xx' looks like it was orphaned (results never came back). ...
1
vote
2answers
899 views

How to reset root password CentOS (domU) hosted in Xen?

Need help on resetting root password of a CentOS which is a guess OS (domU) in XEN. I already tried to get to grub but it doesn't display or maybe using a different grub (pygrub). Thanks in advance.