Questions tagged [xen]

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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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?
s1na's user avatar
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4 answers
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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 ...
ananthan's user avatar
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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 ...
aseques's user avatar
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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. ...
user2284355's user avatar
2 votes
2 answers
5k 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 ...
NobleUplift's user avatar
1 vote
2 answers
17k 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 ...
user2284355's user avatar
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2 answers
967 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 ...
Valter Silva's user avatar
1 vote
1 answer
652 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 ...
rush's user avatar
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1 answer
3k views

XenCenter can't connect to XCP server after restart

After restarting a XCP 1.6.10 host machine, XenCenter 6.1 is no longer able to connect to it. The failure message is always "Server failure: Unauthorized". Using ssh with the exact same root ...
dorian's user avatar
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2 answers
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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 ...
user2284355's user avatar
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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 ...
Julio Fong's user avatar
4 votes
1 answer
426 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 ...
HoverHell's user avatar
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1 answer
912 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 works ...
Uwe Keim's user avatar
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2 answers
780 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 ...
Paco's user avatar
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22 votes
4 answers
2k 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 ...
Ward - Trying Codidact's user avatar
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1 answer
933 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, ...
franky's user avatar
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1 answer
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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 ...
user1091344's user avatar
10 votes
2 answers
24k 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 ...
Ha Son Hai's user avatar
1 vote
1 answer
681 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 ...
fdafgfdgfagfdagfdagfdagfdagfda's user avatar
1 vote
0 answers
367 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 ...
Shawn Edwards's user avatar
1 vote
2 answers
4k 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 /proc/...
Mike's user avatar
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1 answer
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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 ...
John P's user avatar
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1 vote
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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 ...
Rapsey's user avatar
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1 answer
4k 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 ...
Hannes's user avatar
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1 vote
1 answer
4k 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 ...
Joseph's user avatar
  • 13
2 votes
2 answers
1k 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 ...
tekknolagi's user avatar
1 vote
1 answer
653 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?
Lorin Hochstein's user avatar
1 vote
1 answer
743 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 ...
Pascal's user avatar
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1 vote
1 answer
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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: ...
rmir's user avatar
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1 vote
2 answers
1k 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. ...
Howard's user avatar
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0 votes
1 answer
451 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 ...
poolski's user avatar
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1 vote
1 answer
2k 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 ...
foob's user avatar
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1 vote
1 answer
809 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 ...
foob's user avatar
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3 votes
3 answers
23k 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 ...
Icu's user avatar
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3 votes
3 answers
3k 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 ...
AtomicPorkchop's user avatar
1 vote
2 answers
2k 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 ...
Exostor's user avatar
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1 vote
0 answers
1k 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: When I try adding no-bootscrub to the kernel command line, I get this and a reboot: ...
James's user avatar
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-1 votes
1 answer
291 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' ...
d_pilot's user avatar
  • 323
2 votes
2 answers
847 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 ...
WillingGood's user avatar
5 votes
1 answer
11k 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 ...
Uwe Keim's user avatar
  • 2,440
2 votes
0 answers
3k 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). ...
quanta's user avatar
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1 vote
3 answers
3k 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.
Raleigh Guevarra's user avatar
0 votes
1 answer
185 views

Setting up VPN on a VPS

I want set up a VPN in my Xen VPS with one static IP. What I should set in /etc/pptpd.conf as localip and remoteip. I followed this tutorial: http://freehostinganswers.com/blog/how-to-install-your-...
Reza S's user avatar
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1 vote
1 answer
556 views

ntpdate setting incorrect date after boot

I have a few Debian XEN virtual machines and upgraded them to wheezy(I need the 3.2 kernel for a project). Everything was okay until I rebooted on of the machines. My current problem is, that ntpdate ...
Izzy's user avatar
  • 835
1 vote
1 answer
2k 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 ...
Icu's user avatar
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0 votes
1 answer
861 views

Issues with Xen Kernel and Debian

My Xen installation has gone weird on me and I am trying to get back to normal. I overflowed the base partition and in my haste to delete unused files I think I deleted something important, so now ...
jordan.baucke's user avatar
0 votes
1 answer
103 views

Xen domU sees 35MB less than assigned

I am using ubuntu precise 12.04 and I am booting a paravirtualized ubuntu 12.04 domU, all being 64 bits. The VM has memory=1024 assigned and xentop at the host correctly shows 1024MB, but htop in the ...
Steffen Heil's user avatar
0 votes
1 answer
623 views

Migrate Windows XP to Xen HVM

I want to migrate a Windows XP machine to a Xen 4.1 HVM virtual machine with Windows XP installed (the custom software will only work with XP). The software is custom made, and needs to be migrated ...
John's user avatar
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4 votes
3 answers
2k views

Use SSHFS on XenServer 6.1

On Xen Server 6.1, to backup my VMs, I use a script based on the following tools: xe vm-list to build a list of the VMs to backup xe vm-snapshot to take a snapshot of the VMs xe template-param-set is-...
Icu's user avatar
  • 1,435
4 votes
3 answers
4k views

CentOS 6 Xen guest fails to boot after 'yum update'. Kernel?

I Seem to be having an issue with a Xen guest not booting after a yum update. DomU Configuration: #kernel = '/boot/solus-vmlinuz' #ramdisk = '/boot/solus-initrd.img' bootloader = '/usr/bin/...
Elijah Paul's user avatar

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