XEN is a hypervisor based virtualization technique.
13
votes
3answers
261 views
Horrible situation - file systems mounted simultaneously by multiple independent OS instances
How do I get out of this situation safely?
Details are as follow:
A xen server has got block devices allocated to VMs. But these devices have also been mounted inside Xen.
In fact 44 of these ...
7
votes
2answers
537 views
Tools for Monitoring Steal Time (st)
We're running on a virtual "dedicated" server, which should, in theory, mean that we're the only guys on the server. In practice.... I'm thinking we might not be.
Notice that although it looks ...
6
votes
2answers
262 views
Mysterious write IO
I am just reviewing the disk IO of a XEN VM server. I stumbled across a DomU that has constant write traffic.
To narrow that traffic further down I logged in to the DomU (CentOS 5, 64 Bit) and ...
6
votes
1answer
2k views
Xen on openSUSE 11.4
I have done a few installs of openSUSE to use as a Xen dom0 and have not got it working yet. These are the steps I followed:
Installed openSUSE 11.4 from Live KDE CD.
Installed all updates via ...
6
votes
1answer
582 views
BUG: soft lockup - CPU# stuck for x seconds
I've seen a few bug reports and questions (on stackexchange and elsewhere) regarding a nagging "BUG: soft lockup - CPU#<n> stuck for <dt>s!". So far, I haven't found any clue as to what ...
5
votes
3answers
756 views
What is the fastest Virtualization solution for Linux?
Is it still XEN? Or is it VirtualBox, KVM, VmWare or else?
With fastest I mean that the guest VM is fast (the smallest speed loss because of Virtualization)
5
votes
2answers
4k views
domain 'ubuntu-hvm' does not exists, xen + ubuntu, hvm guest os installation problem
I am following the installation/setup instructions at https://help.ubuntu.com/community/XenProposed to install ubuntu + xen. I was able to install a PV guest OS. However, when I got to the HVM guest ...
5
votes
1answer
2k views
What is hvc0? (appearing in “who” list)
I have an Ubuntu Server, and when I type who, to see who's connected, I can see that there's a user connected, and instead of being logged to a pts/x, he's connected to hvc0. Is there something to ...
5
votes
2answers
612 views
Good tutorial for setting up a KVM/Xen box and advice on which would be better
I've got a dual xeon, 2GB, 75GB hd server that I'd like to turn into my dedicated virtual environment. Currently I'm using VirtualBox locally to run a mock cluster for Cassandra and Nginx/Haproxy, ...
5
votes
2answers
3k views
GPGPU/CUDA in KVM or Xen
We would like to enable direct access to CUDA-enabled GPUs within either KVM or Xen (or Citrix Xenserver). Specifically, we want to use PCI passthrough to access an NVIDIA Tesla S2050 unit, which is ...
5
votes
1answer
813 views
Force X to use second video card so I can pass through first card to XEN VM?
So I am trying to get X to start on my second (PCI 02.00:00) video card and stop using the main card (PCI 1.00:00). I would like to do this because I want to pass through the PCI 1 card to a XEN HVM ...
5
votes
1answer
357 views
Linux process scheduling - Cap/Weight based?
I am just trying to understand the basics of Linux scheduler.
Is Linux scheduler a Cap based or weight based scheduler?
I was previously using Xen. Now I am moving from Xen to KVM. I read VMs are ...
4
votes
2answers
358 views
VM benchmark tools?
I would like to benchmark of few XEN-constallations:
PV DomU
HVM DomU with PV network and disk drivers
HVM DomU with emulated IDE and PV network
The base will be the same VM with the same ...
4
votes
2answers
159 views
How to backup entire xen dom0 (on debian)
How do you go about creating a bootable backup ISO of my computer (dom0)?
I have tried remastersys and this backs up everything but Xen does not work properly. LiveCDs also do not work.
Does ...
4
votes
2answers
422 views
How do I configure Xen GPU passthrough for my AMD Radeon GPU?
I have an Ubuntu Server 12.10 setup with Xen 4.2.0 installed (compiled from source) and an AMD Radeon 7750 GPU. My Xen installation appears to be working and I can create virtual machines for example.
...
3
votes
1answer
675 views
Running xen inside VirtualBox , possible?
Can i run a Linux system inside VirtualBox or VMware , with xen kernel ?
It's not intended for a real server or production workplace , just to learn the configuration of XEN.
BTW: target computer ...
3
votes
1answer
1k views
avoid IPv6 link local address on interface
I have a setup with virtual Xen hosts connected to a set of VLAN-s. On Dom0, I have set up a bridge for each of my VLAN-s to connect DomU-s to. Bridges are set up in /etc/network/interfaces like ...
3
votes
1answer
955 views
Why would my Linux host suddently stop receiving multicast? All other nics on private network are receiving
Here is my dilemma. Suddenly, as of yesterday, multicast packets are no longer being received from eth1 (private gigabit network) from one node. Routing between all the nodes is fine, no collisions, ...
3
votes
2answers
2k views
Unable to boot VM: Error 13: Invalid or Unsupported Executable Format
I used VMWare vConverter and everything converted fine, but when I try to boot I get an error:
The physical machine boots correctly, so I don't think it is a source machine issue. I am not sure why ...
3
votes
1answer
427 views
Xen domU fails to start with kernel panic
My dom0 is Gento 3.3.2, the kernel is compiled with Xen support. And I am planing to use the same kernel to boot my domU.
This is my domU configuration file:
1 vif = [ 'bridge=xenbr0' ]
2 vcpus ...
3
votes
2answers
138 views
Live-migration of a SLES9 DomU?
With SLES9 SP4 we managed to set up a XEN PV DomU.
We are using SLES10 SP4 as Dom0 and DRBD 8 as disc-backed: a drbd-device corresponds to xvda in the DomU. The DomU uses the xenblk and xennet ...
2
votes
2answers
635 views
What is /dev/xvde1?
I'm having to do with an OpenShift RHEL Linux installation running on Amazon EC2. In the filesystem, there is a device file named /dev/xvde1 mounted to / ... and a device file named /dev/xvde2 mounted ...
2
votes
2answers
2k views
telnet to localhost and loopback device IP works, but not LAN ip (Xen + Ubuntu)
I have set up Xen + Ubuntu per the instructions at https://help.ubuntu.com/community/XenProposed. I am now ready to install a HVM guest OS (Ubuntu Desktop 12.04). After I start my HVM guest OS
xen ...
2
votes
2answers
427 views
Different Kernel in DomU than in Dom0 on xen
If my Dom0 on Xen is kernel 2.6.18 with xen 3.3.1 can i boot a, say, 2.6.34 kernel in a DomU ?
Background: 2.6.18 runs like a charm on Dom0. Don't want to update here, because there is special ...
2
votes
2answers
3k views
XenServer how can I shrink the virtual drive of XenServer domU?
How can I shrink the virtual drive of XenServer image?.
I gave 300Gb of space for one image (domU) and that was mistake. Now I want to shrink it. How can I do that?
The system is already set up and ...
2
votes
1answer
398 views
How long should it take to generate 300 bytes of entropy on a VPS?
I'm running NetBSD on a Xen VPS, and I'm trying to generate a gpg keypair. I've gotten most of the way there, but now I'm getting the following error message:
Not enough random bytes available. ...
2
votes
2answers
500 views
Xen, bridge and multiple IPs on CentOS
There's a new server that is assigned 5 IP addresses. I want to use Xen to run several VMs with various services.
This is my first attempt to install Xen, I use this tutorial as a guideline. Stuck ...
2
votes
1answer
399 views
Learning how to build my own linux kernel
Reference - http://www.linode.com/wiki/index.php/PV-GRUB#Building_Your_Own_Kernel
In order to work with Xen, a number of options that must be selected:
CONFIG_PARAVIRT_GUEST=y
CONFIG_XEN=y
...
2
votes
1answer
3k views
Getting “cpio: Bad magic” when trying to rpm install into a mounted Logical Volume
I need some help with this. I am trying to follow the Xen guide to provision a domU using package installation of the Fedora 15 release (the dom0 is CentOS 5.6). Ive run the rpm install command with ...
2
votes
1answer
544 views
Can rpm handle an install of another OS into another Logical Volume?
I am trying to install fedora as a domU under a CentOS dom0 using the method outlined in The Book of Xen. I have asked another question regarding a consistent error message of cpio: Bad magic when I ...
2
votes
1answer
739 views
Debian 6.0 and Xen PyGrub failure
On my VPS (running Debian 6.0 on Xen with PyGrub) I get the following error when trying to upgrade the system:
Searching for GRUB installation directory ... found: /boot/grub
warning: grub-probe ...
2
votes
0answers
120 views
XEN Bootloader or Kernel error bootloader isn't executable / cannot locate kernel when using XM create
I am currently using Xen for installing VM guests however whenever we run
xm create -c /etc/xen/ks.test.cfg
we get;
Using config file "/etc/xen/ks.test.cfg".
Error: Bootloader isn't executable
...
2
votes
0answers
605 views
PCI passthrough with Xen
I am trying to run Windows XP in a Xen DomU virtual machine with a PCIe device, for which there are no Linux drivers, being passed through from a Debian Squeeze Dom0. My hardware supports ...
2
votes
2answers
273 views
What to do when ubuntu-vm-builder completed?
I already have the VM (Xen based) installed, but the Xen config used specified "Linux kernel" as "None".
The exact command line was:
ubuntu-vm-builder xen precise -v --debug --addpkg openssh-server
...
2
votes
1answer
958 views
PCI passthrough without VT-d
My CPU is Intel T9300, it supports VT-x, but it does not support VT-d. I am using Xen pvops virtualization. I have a PCI device, and my host system can work without it. So I am thinking if it is ...
2
votes
1answer
740 views
no network on domU in network-bridge configuration for Xen-4.0
I created a very standard Xen-4.0 domU with network-bridge configuration. However, no packets get out from the virtual machine to the network which bridge (peth0) is attached to. From guest I can ping ...
2
votes
0answers
448 views
fedora 14 xen virtual machine does not detect network
I'm trying to create a para-virt Fedora 14 xen vm on a host running CentOS 5.5. The VM appears to initially install correctly (the installer finds eth0 and can access the installation media). But when ...
1
vote
1answer
97 views
Xen error on CentOS
During the creating of a new virtual server in xen using this command
xen-create-image --hostname=minecraft.koanhosting.com --ip 87.98.249.146 --install -method=debootstrap
But I keep getting this ...
1
vote
3answers
597 views
XEN Storage Repository has option type=lvm missing (XCP)
Several online documents on this subject talk about creating an SR with the option type=lvm but trying these:
# xe sr-create type=lvm device-config:device=/dev/server/sr_guest1
name-label=sr1
...
1
vote
1answer
380 views
What kind of installation should I choose from CentOS to have it as dom0 xen host?
I want to have CentOS 6.0 x86_64 as a dom0 xen host. During the installation of CentOS there are many options for installation: "minimal" "Basic Server"... "Virtual Host"..
The question is: which one ...
1
vote
2answers
105 views
Xen: Migrating LVM-based machines from Xen Opensource to Xen Cloud Platform
we have several LVM-based VMs running on a Xen Opensource host. "LVM-based", in our case, means that there's a LVM volume for the root partition and another volume for the swap partition. The kernel ...
1
vote
1answer
794 views
Guide to installing Xen on CentOS 5.9 (That is still valid)
I need an idiots guide to installing Xen Hypervisor on CentOS 5.9
We attempted to install it on 6.3 before, but completely failed, so we reverted to 5.9 to see if we had more luck. We had issues ...
1
vote
1answer
395 views
Difference between Oracle VM and Citrix XEN?
I`ve been testing Oracle-VM this day. Is there anyone out there who has tested both XEN-based solutions?
What are the main differences?
1
vote
1answer
664 views
How to increase Xen guest CPU utilization?
My Xen dom0 is a Gentoo x64 pvops. I boot my guest Gentoo, in PV mode, system with the same kernel my dom0 uses. When I emerge in the guest system, building a CPP package, I am experiencing low CPU ...
1
vote
2answers
244 views
Multiple dom0's on a single Xen host?
I've recently been researching Xen, and this has come up as a quistion for me.
Is it possible to have more than 1 dom0 running on a single Xen host?
The reason I ask is that this is very similar ...
1
vote
0answers
44 views
Scrambled Xen Console on dom0
I installed Xen using the recommended procedure on Ubuntu's site using motherboard Supermicro X7SBL-LN2 and Ubuntu 13.04 amd64. After the installing it and rebooting my console looks like this: ...
1
vote
2answers
213 views
ext3 root filesystems goes read-only with aborted journal even after repairs
Short version: ext3 root filesystem on rackspace (xen) VM detects aborted journal on boot and mounts read-only. I've attempted to repair this from a rescue environment with tune2fs and e2fsck as ...
1
vote
0answers
185 views
Use dd to backup disk image within an OpenVZ container
I want to use dd to backup the disk of an OpenVZ VPS in addition to traditional cold tar backups. Because I may need to migrate to a different VPS provider.
From end user point of view, OpenVZ ...
1
vote
0answers
116 views
Xen is unable to use URL's to install CentOS
I can't seem to use URL's when using the netinstall for CentOS, I'm installing CentOS on a Xen VPS.
I keep getting this error in the terminal window, when I use the URL:
...
1
vote
1answer
55 views
vpn conntect over an additional server
I (A) want to connect to my virtual XEN-server (B) with Ubuntu OS via vpn. This server (B) should than connect to another server (C). The traffic should be routed from A to C. C is using CISCO VPN. ...
