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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16
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9answers
21k views

LVM snapshots as a backup strategy

How viable as a backup strategy would be periodical LVM snapshots of xen domU's? Pros, cons, any gotchas? To me it seems like the perfect solution for a fast, brainless restore. Any investigation ...
8
votes
4answers
9k views

Xen DomU root filesystems becoming read-only on iSCSI virtual IP failover

My Xen servers are openSUSE 11.1 with open-iscsi to our iSCSI SAN cluster. The SAN modules are in an IP failover group behind a virtual IP that the initiators connect to. In the event that the ...
4
votes
1answer
8k 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 ...
4
votes
5answers
3k views

vmware server end of life, where to go now?

We have some virtual machines on vmware server 2.x running on 64 bit hardware and quite happy with it. As vmware server will no longer be offered we are thinking to migrate to ESXi, which seems is ...
1
vote
3answers
3k views

Centos Xen resizing DomU partition and volume group

I have a setup like so: Dom0 LV | DomU Physical Disk | | XVDA1 XVDA2 (/boot) (DomU PV) | VolGroup00 (DomU VG) ...
3
votes
8answers
1k views

Deploy Xen

I would like to deploy Xen virtualization, however I definately not sure which way to go. Citrix Xen Server has (AFAIK) better managment tools, but does not provide software raid. Ubuntu / CentOS ...
1
vote
1answer
2k views

What are XSAVE and /dev/xvda1

So I logged into a new Amazon EC2 instance created with one of their new "standard" AMI's. Instead of seeing /dev/sda1 I see /dev/xvda1 . This relates to Xen somehow. Here's what I can find that ...
1
vote
1answer
2k views

How can I change memory resources from within the DomU?

For a certain job I sometimes need more memory in a DomU (CentOS 5). The trigger for the start of the job are some conditions that I can only check within that DomU: The DomU is waiting for an upload. ...
7
votes
2answers
3k views

KVM to Xen migration

I've recently been appointed to create some VMs for production use, and went gung ho into making a KVM based VM instead of finding out what our production server uses. I've only recently found out ...
4
votes
1answer
996 views

Network Bridge in dom0 can not ping domU's

I am using Debian wheezy with XEN 4.1. I have two network bridges xenbr0 and xenbr1. xenbr0 is linked to the real-eth0-nic so the domU's can talk to the outside world, which worked fine. xenbr1 was ...
80
votes
4answers
15k views

Why is TCP accept() performance so bad under Xen?

The rate at which my server can accept() new incoming TCP connections is really bad under Xen. The same test on bare metal hardware shows 3-5x speed ups. How come this is so bad under Xen? Can you ...
34
votes
7answers
60k views

Xen vs KVM in performance

What is faster on same hardware - Xen or KVM? I'm trying to pick-up a virtualization technology to work, which gives the best performance. There are some benchmarks here that I found on the subject: ...
8
votes
5answers
7k views

How to fine-tune our MySQL server?

MySQL is not my thing, yet I need to fine-tune one of our servers. Here are the requirements/specs: The MySQL server has only one significant database We only have one "type" of application ...
15
votes
7answers
6k views

Is virtualbox good for live server virtualization

I used virtual box before to test OS installation on my own personal computer. I'm not sure if it's suitable for actual virtualization on live servers. I mostly hear about Xen for that. Is virtualbox ...
8
votes
1answer
5k views

VDI Comparison - VMWare View vs. XenDesktop vs. Sun VDI

We're looking at implementing a VDI solution where I work. Currently, we run a mostly Linux shop with Windows clients (Samba PDC too). We've been evaluating a VDI solution for use and was wondering ...
6
votes
2answers
4k views

Intel Atom 330 as a server machine [closed]

That's the processor I'm thinking about getting for a home server / development machine. Going for $80 as intel motherboard + dual core processor combo is a really tempting deal. What I'm planning to ...
4
votes
3answers
3k views

Is KVM stable enough for production use in 2011?

We are planning to virtualize the existing infrastructure by an open source virtualization solution. KVM and Xen are on the final list. Big cloud players are still using Xen, and we found that KVM is ...
8
votes
8answers
2k views

Which virtualization platforms should I choose, Xen or OpenVZ? [closed]

I am upgrading my shared hosting to VPS hosting, mainly to just add server administration skills to my development skills, so I'm facing a lot of new choices just signing up. I need to choose a ...
6
votes
2answers
11k views

Debian/OVH: How to configure multiple Failover IP on the same Xen (Debian) Virtual Machine?

I have a problem on a Xen virtual machine (running latest Debian), when I try to configure a second failover IP address. OVH reports that my IP is misconfigured and they complaint they receive a ...
5
votes
7answers
6k views

Secondary IP (eth0:0) acts like main server IP

I have a CentOS server, configured with 4 consecutive IPs: eth0 5.x.x.251 eth0:0 5.x.x.252 eth0:1 5.x.x.253 eth0:2 5.x.x.254 The problem is that all traffic goes out to the internet with eth0:0 (...
3
votes
2answers
1k views

Xen DomU on DRBD device: barrier errors

I'm testing setting up a Xen DomU with a DRBD storage for easy failover. Most of the time, immediatly after booting the DomU, I get an IO error: [ 3.153370] EXT3-fs (xvda2): using internal journal ...
3
votes
2answers
2k views

Xen host and guest sharing same IP

Is it possible for both Xen host and Xen guest to share same IP (albeit with different ports)? We have a single public IP, and want to have both the Xen host (as host only, no other role) and the Xen ...
1
vote
3answers
5k views

Unable to connect Xend with virt-manager

I have installed debian 6.0.1a. I have install all XEN stuff. including xen kernel, libvirtd, ... but when i want to connect xend, virt-manager shows me this: Verify that: A Xen host kernel was ...
4
votes
2answers
480 views

How do I make all Xen guests use their host clock value?

I've set up Xen server under Linux with several guests running, and all was well. After some time I've noticed the clock on the server drifted away, so I installed 'ntpd', and the clock was back to ...
4
votes
6answers
5k views

How to find dom0 name from hosted domU

I'm actually testing RHEL 5.3 with Xen between two servers in order to have a disaster recovery solution. So I'm playing with moving my domU from one dom0 server to the other server. Unfortunatly ...
1
vote
1answer
3k views

Managing XEN through virt-manager on ubuntu 12.04

I have been trying to make xen work on a remote machine with no GUI.Installed XEN hypervisor on the machine and booted in that kernel.Try to create VM using virt-manager. I tried accessing virt-...
1
vote
3answers
2k views

iptables rule to block incoming/outgoing traffic to a Xen container

I'm trying to setup IPTABLES on my xen host server that will block incoming and/or outgoing access to a xen client on the same machine. Specifically, I need to block outgoing port 25 traffic and ...
1
vote
2answers
3k views

Changing XEN VM configuration

What is the correct way to update a XEN VM configuration? In this case I want a specific domain to stop using /dev/emcpowerg and use /dev/emcpowerh in stead. I have ensured that the two devices have ...
1
vote
1answer
423 views

Xen in routed mode: start fails

When Xen is configured in routed mode, restarting xend fails because the script hotplugpath.sh is missing. ~ # /etc/init.d/xend restart Restarting Xen daemons: xend/etc/xen/scripts/network-route: ...
1
vote
2answers
1k views

Troubleshooting poor disk IO performance

Note that while this question is a little Redis-specific, the main problem is generic: a process takes so much HDD IO write bandwidth that other processes can't write anything. We've got an Ubuntu VM ...
0
votes
1answer
953 views

How do I transfer a Windows XP/Vista/7 partition into Xen?

Good morning Server Fault, I have several hard disks with installations of Windows XP, Vista, and 7. I do not want to (or rather can no longer) reinstall these Windows installations so I want to ...
0
votes
2answers
951 views

Xen console access from the web

Slicehost offers this, but I was wondering if there is a program out there that will do this (make a domU console available in a web browser). If not, where would you start in putting together one?
0
votes
3answers
1k views

NTP time sync not working in a DOMU Centos 5.5 server

I have a Xen Centos 5.5 server with ntpd working in virtual server. NTP time sync seems not working. I have disabled any firewall. my grep -i ntpd /var/log/messages output: Apr 1 16:15:47 ...
6
votes
1answer
1k views

Windows 8 virtualization gives BSOD 0x0000005D

I find that, when trying to run windows 8 on Xen cloud (and also when running it in ESXi), the installer bluescreens with 0x0000005D (UNSUPPORTED PROCESSOR) Initially I thought it was giving the VM ...
5
votes
3answers
9k views

Ubuntu 12.04 Netinstall URL? Xen Host

Well I have an Xen server, I've got a CentOS container up fine but a friend of mine wants (oh god) Ubuntu Server 12.04, why he can't use Debian is beyond my understanding. But anyways, I can't ...
5
votes
4answers
299 views

Virtualization for hardware resiliency?

Can anyone tell me if it is possible to pool several physical servers to run a resilient virtualization environment. Our servers are getting more and more critical to our clients and we want to do ...
3
votes
1answer
151 views

xend doesn't bring up the vif interfaces

I'm trying working with Xen and I've tryed to build up a virtual machine in domU. I'm using the following configuration for the domU kernel = '/media/home_separata/domU_kernel/boot/vmlinuz-linux' ...
3
votes
1answer
438 views

Does ESXi 5 have a “routed IP” feature like Xen?

I have a dedicated server that I would like to use ESXi 5 on. I previously had Xen and it worked great. Initial network configuration was a bit confusing. The problem I have is the hosting company ...
3
votes
1answer
748 views

Straight-forward to Virtualise with XEN or KVM on IBM Server System x3650 M4 791562G?

I want to built a virtualised Server Environment using XEN or KVM. The virtual machines should be purely debian systems - so XEN or KVM should be a sane choice. Now while buying servers, I am ...
2
votes
1answer
470 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
votes
1answer
944 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 ...
2
votes
4answers
2k views

CentOS or OpenSolaris for Xen dom0?

I would like to play around with Xen with the intention of eventually running a bunch of different services on separate virtual machines (partly just because I can), and have the possibility of trying ...
2
votes
1answer
1k views

Cannot connect to Xen domU via VNC if X isn't installed on domU

I'm trying to build a Xen domU that can be connected through the Xen's VNC server. Below is the template (actually it's generated by OpenNebula): name = 'one-153' #O CPU_CREDITS = 256 memory = '128' ...
1
vote
2answers
1k views

Alternatives to bridging infiniband ipoib within xen domains?

I've installed xen-hypervisor-4.1 package onto an Ubuntu 12.04.3 server. It has an infiniband adaptor installed and I run IPoIB with it. What I'm wanting to do is provide the ipoib to one or more ...
1
vote
1answer
147 views

Hammered by botnet; iptables can't keep up [duplicate]

Fructis is a multi-site (and multi-software) VM (Xen) with 2 cores and like 6G of RAM. It hosts popular Drupal and Wordpress websites and is currently getting hammered. I will put all details below. ...
1
vote
2answers
4k views

Xen - can't create domain because 'vdb could not be connected'

I'm trying to start up a Xen VM, however I'm getting the following error: Error: Device 2049 (vbd) could not be connected. Hotplug scripts not working. what does this mean? The dom0 is CentOS and ...
1
vote
2answers
2k views

Xen network-bridge interface renaming

According to the comments in Xen's network-bridge script, the process of starting the bridge with external interface eth0 is thus: # Creates the bridge # Copies the IP and MAC addresses from eth0 to ...
1
vote
1answer
2k views

Xen machine can see others on subnet but not gateway

EDIT: solved it appears that switching static MAC definitions combined with mapping vif/0 and vif/0 statically to eth0 and eth1 (in domU, as per http://tomclegg.net/xen-eth0-renamed) done it. I'm ...
1
vote
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 ...
1
vote
2answers
7k views

Citrix Xen VM's lose networking

My client has a XenServer 6.0.2 installation with 2 Window Server 2008 R2 virtual machines. Whenever the virtual machines are rebooted they lose their IP settings (IP address, subnet, gateway). Each ...