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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943 views

Xen domU shared drive alternative to NFS?

We have a Xen server where the dom0 acts as both vm host and storage host. Nothing special about the server, the storage is an internal RAID array. No failover partner or anything. Each of the ...
0
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1answer
233 views

Adding an ssh key to a Xen VM

I recently needed to restart a Xen host box, and now I can no longer ssh into the VMs. I was able to before, but now I get Permission denied (publickey). I am not too experienced with Xen, is there ...
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1answer
423 views

KVM VM CPU prioritization on CentOS 5.5

I'm transitioning from Xen 3.4 to KVM on CentOS 5.5. I need to assign CPU priorities to VMs, to ensure that one VM (vmA) always receives priority over another VM (vmB). In Xen I could assign a ...
2
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4answers
8k views

Citrix XenServer: how to add RAM to a guest VM without XenCenter?

Is it possible to add RAM to a guest VM in without using XenCenter, but from the host machine console or a remote machine?
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3answers
2k views

Xen connect to dom0 with vnc?

Is there are a way to connect to dom0 using VNC without running X? I don't want an X server, I just want to see what is on the console. EDIT: Adding some background, since people seem to be really ...
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1answer
252 views

Is it possible to allow multiple VNC connections to a DomU?

Is there a way to enable multiple vnc clients to connect to the same DomU using the Xen 4.0 built-in vnc server?
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1answer
285 views

Can I reset a VNC connection to a DomU?

VNC to my DomU VMs works great. The only problem is that I can only have one vnc client at a time connected, and if someone leaves a session logged in, or if I am disconnected suddenly, I have to wait ...
2
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2answers
2k views

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 ...
2
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1answer
794 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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2answers
427 views

Linux Kernel Oops - source unknown

hopefully someone can help interpret what is going on here: [ 2081.280253] BUG: unable to handle kernel paging request at ffff8801ad287000 [ 2081.280262] IP: [<ffffffff8000f549>] ...
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1answer
144 views

Specify the user for Xen's xm console?

I have a situation where I need xm console <domID> to drop into a specific user in a CentOS PV VM, say UserB. UserA was the first user created in the VM, and whenever I xm console <domID> ...
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1answer
2k views

NIC models for HVM guests in Xen 4.0

Is there a list of NIC models that I should use with various HVM guests in Xen 4.0? Is there even a list of possible choices for the model=field? I'm planning on running both Windows and FreeBSD ...
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2answers
154 views

Is it possible to run SQL Server Developer Edition on Xen VDI?

We're at the end of a VDI deployment and have a new requirement to install SQL Server Developer Edition (2008) on the virtual desktop clients. The DBA's were invited late to the party and ...
1
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1answer
793 views

Change or set domain id on a vm

Is it possible to set a domain id for a vm in xen at all? I'd imagine that changing it while it is running would be problematic, but if I can even set it in the config file or when xm create foo is ...
1
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1answer
843 views

Help me understand how Xen vCPU/CPU works

Say I have a Dual-Core server, that's 4 cores w/ two physical processors. I read numerous articles that states the dom0 should get one physical core to itself. By core, does that mean a single CPU ...
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1answer
695 views

How to migrate a Windows Server 2003 physical server to Xen VM

We have some 10 physical servers running Windows Server 2003. Now we have bought a new xen server. I have added Windows Server 2008 R2 as host as a guest VM in xen host. Now we are planning to move ...
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2answers
139 views

Xen virtual host can reach some sites but not others

Okay, this is killing me. Debian Squeeze, Xen 4.0, brand new install. No iptables rules whatsoever except for the ones added by the default xen bridge script. Dom0 can reach the entire world, no ...
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2answers
682 views

Proper way to partition filesystem with Xen

I'm coming from a vmware environment, wanting to play with Xen. I have a server with 2 x 500G SATA drives (no hardware RAID available, have to use software-based RAID1). My partitions are all RAID1 ...
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2answers
122 views

New Xen host w/ 2 x 500G drives

First time using Xen, I come from a vmware world but would like to expose myself to some Xen technology. With that said, I have a spare server (Dual proc, 8G of RAM w/ 2 x 500G sata drives). Stupid ...
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2answers
256 views

is it possible to deploy squeeze domU under Lenny dom0?

is it possible to deploy squeeze domU under Lenny dom0 ? using xen-tools and debootrap for example any big problems if possible?? regards
4
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1answer
853 views

How to expose virtual 10Gb ethernet port to Xen Domain

I would like to expose a virtual 10Gb ethernet interface into a Xen HVM domain. The base OS is Debian Squeeze, 2.6.32 kernel, Xen 4.0. Is there any way to make this happen without actually having a ...
0
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1answer
952 views

Remount read-only device as read-write on xen guest

I have a xen guest machine running ubuntu 10.04 with a disk device marked as read only. Now if while the xen guest is running I mark the device as read-write how can I tell the guest it can now write ...
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3answers
972 views

clustered file system choice for KVM/XEN in Fibre Channel Environment

Gents, what would you recommend for production use in a FC environment, where live migration is a must? Which clustered file system should we use? OCFS2? Would you still need drbd? Thanks!
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2answers
86 views

What is IP address on a subnet

I'm reading the requirements for a virtualized environment from here which says: IP Address - One IP address on a subnet for the host. - One IP address on a subnet for each VM Guest. I want ...
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1answer
58 views

what virtualization design they have here [closed]

I'm trying to understand what virtualization schema they have here. Initially I thought it's just Xen on a physical server, but if you click FAQ & Features, it takes you to this page that says ...
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6answers
3k 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 ...
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1answer
651 views

CentOS 5.5 needs xenblk.ko, what's the easy way?

I'm taking a class on cloud computing and we're using CentOS 5.5 with xen. When I tried to run mkinitrd to build a vm, I got a message that xenblk was not found, and indeed I can't find the xenblk.ko ...
3
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1answer
246 views

Can i install Xen Hypervisor on a dedicated server that is already in use

I have a dedicated server, currently i sell shared hosting on this server... Now i want to sell VPS also on my server. Is there a way i can sell VPS? Can i use Xen Hypervisor,will it disturb my shared ...
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1answer
3k views

How to unhide a VM in Xen?

After failed OVF import, I have some VMs which are appearing in XenCenter only if I enable Hidden Objects option in View menu. How can I unhide a hidden Virtual Machine in Xen Server?
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1answer
329 views

Networking setup under Xen 4.1

Looks like Xen 4.1 went through some major changes as far as networking goes. With that said, I have two NICs on the host. eth0 and eth1. I want dom0 to be accessible via eth0 and only eth0. I want ...
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3answers
925 views

XenServer on i7 Processors?

Was wondering if anyone is using an i7 XenServer. Didn't see anything in the HCL on the XenServer site. If you are using it how is the performance and should I build one on i7 or a older Xeon ...
2
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1answer
975 views

Ubuntu upstart hangs on interactive start & stop

How do I get Ubuntu upstart to not hang on interactive start & stop? I have created many upstart scripts that work fine during init, but often hang when I enter them at the console. If I CTRL+C ...
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3answers
1k views

Virtualisation: Running KVM, XEN or … on an Integrity (ia64) server (with x86_64 guests)

We have a spare Integrity blade (2x Tukwila quad-core + 16Gb RAM) laying around which I would like to use has a Virtual Host for a couple of Linux VMs. I am having some concerns finding the best ...
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2answers
612 views

XEN VM config locations on Debian Squeeze

I have inherited a debian squeeze VM host, which is not booting anymore. I want to export the virtual machines to another host, including config files and disk containers before killing the machine. ...
4
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3answers
2k 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 ...
1
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1answer
449 views

Setting up Xen on Ubuntu 10.04 LTS (64bit) from a precompiled kernel

I'm looking for a way to install Xen(Dom0) on Ubuntu 10.04 LTS 64bit without having to compile my own kernel. I used to do this for 8.04 using this precompiled kernel: ...
2
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1answer
476 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, ...
2
votes
2answers
3k views

Problem with Xen, xvda and sda

I am creating a cloud for my university using Eucalyptus with Xen (PCs have Debian Squeeze 64 bit installed). I have a problem with the following guest configuration: # # Configuration file for the ...
74
votes
4answers
13k 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 ...
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2answers
285 views

Collectd retrieving only NaN on Xen dom0

For some reason Collectd works fine on all my virtual servers, but on the dom0 of my Xen setup it keeps returning a value of NaN, I have checked the RRD files and it seems somehow all plugins are ...
0
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2answers
197 views

Debian/Nginx/PHP5-FPM on Xen. Is it the right choice?

I have a complex web application running on a Debian/Nginx/PHP5-FPM stack. The application usually has ~600 online users everytime, and ~5000 unique users per-day. The stack is running on a Xen-based ...
0
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1answer
276 views

Why would Xend try to restore a deleted domain/VM?

I have a domain 'host10' that no longer exists on the system. The config file was renamed, the configuration changed to point to a different .img, and the image name was renamed as well. I've done ...
0
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2answers
1k views

What causes the error “Error: Device 0 (vif) could not be connected. Hotplug scripts not working.” on CentOS5.6 x86_64 with Xen kernel?

I have 10 domU's on my CentOS 5.6 server running Xen kernel. All 10 are set to start on system boot; however, for just 1 of the machines, I get this error: Error: Device 0 (vif) could not be ...
0
votes
2answers
779 views

Upgrading a Xen host from debian lenny to squeeze

I am in the process of upgrading the Xen host from Lenny to Squeeze. What is the recommended route for this upgrade? Upgrade the host first then the guests? Will the guests be able to boot if I do ...
1
vote
1answer
2k views

Xen to KVM windows guest migration

I'm trying to work out how to migrate a Xen based windows server guest to a KVM host. I've grabbed a copy of the Xen image and run an image conversion on it. kvm-img convert -O raw ...
1
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1answer
262 views

high load and OOM-killer on domUs while pvmove

Situation xen 4.0.1 dom0 (debian squeeze) domUs all with LVs as disks: disk = [ 'phy:/dev/vg-00/domu-swap,xvda1,w', 'phy:/dev/vg-00/domu-disk,xvda2,w' ]) one VG (vg-00) with 2 PVs Goal Move all ...
2
votes
4answers
926 views

Virtal Machine Managment Control Panel - Xen/KVM [closed]

We are looking for an open-source or low cost virtual machine management control panel. We require it to be able to manage up to dozens of hypervisors and thousands of virtual machines. It should be ...
3
votes
2answers
2k views

RHEL5.5 yum can't see a package (xen) on repo?

hi i'm trying to install xen via yum on RHEL 5.5. When i browse the repo here: http://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/ I can see the package i want. specifically ...
2
votes
3answers
875 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 ...
1
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2answers
349 views

How can I fix this wrong/incomplete Xen routing setup?

I've got some Xen hosts configured in bridged mode, whose VMs use public or private IPs: Host #1 dom0: 3.3.3.71 dom1: 10.0.2.10 dom2: 3.3.3.85 dom3: 10.0.2.11 Host #2 dom0: 3.3.3.72 dom1: ...