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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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How to connect to dom0 console from a trusted domU?

Is there a way to connect from a trusted domU to dom0 via console? I'd imagine I need to install some Xen tooling to do this; but, which tools? And, is there some permissions/firewall I need to ...
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Is it possible to pass command line to grub2 as xen kernel?

I have several domU-s, each uses xen-grub2 configured as kernel to start, i.e. the virtualname.cfg contains no bootloader (like pygrub) but kernel = /path/to/grub-x86_64-xen.bin The thing is that ...
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Xen pool upgrade from 6.5 to 7.6

We are running a XenServer pool on an IBM BladeCenter S with 4 HS22 blades installed. 3 of the blades are in a pool and the fourth not. The blades have no internal storage and all get it from the ...
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How secure is qubes os? [on hold]

How secure is qubes os? Lets say i have bought dedicated bare metal (NOT VPS) server in some country. Installed qubes os, LUKS encrypt disk and run some PROCESS in security qube. Now, lets say ...
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Xen virtual guest having dropped packets

I have noticed dropped packets on my Xen virtual guest. Checking with main server no dropped packets observed. What could be causing this? Im using 4.9.112-32.el7.x86_64 Added new info :
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40 views

SSH into Xen Virtual Machine connection refused

While practicing for SysAdmin certification, I spun up a virtual machine. I could not SSH into it from my laptop on my LAN. I could SSH into the VM from within the host OS. After some reading and ...
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18 views

I/O performance issues with dd “benchmark” on XenServer 7.1 using SLES12-SP3 in HVPVM mode

Why does SLES12-SP3 in HVPVM mode perform that badly compared to the other two? SLES12-SP3 VM inside ESXi 5.5: Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz ...
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2answers
60 views

Kill a process inside an lvm snapshot

In my XEN host, I have a snapshot that cannot be removed with lvremove $ lvremove /dev/vg0/snap-tmp-vm06.docker-disk -fdv DEGRADED MODE. Incomplete RAID LVs will be processed. Using logical volume(s) ...
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2answers
50 views

Adding a bridge kills the internet connection from all interfaces

I'm working on debian stretch with the newest xen from repositories. I've never worked with xen before, so bare with me. I've searched far and wide, and all solutions I apply do not work. Installing ...
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12 views

Use xl or virsh to manage virtual guests?

It seems that you can use either xl or virsh for managing virtual guests. How do these compare? We're using Xen 4.10 if that matters.
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1answer
32 views

Is live migration causing data corruption?

We have two virtual hosts (Xen 4.9) and live migrate guests between them. The storage of the guests is accessible via iSCSI. That is, a guest running on host A has its storage presented as a straight ...
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56 views

How to recover data of a Bluescreen XEN HVM Windows server (SolusVM)?

The server won't boot into any of the following modes and the VPS crashes in the loading screen with a Bluescreen error. SafeMode SafeMode with Networking Last Known Good Configuration Normally How ...
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89 views

grub-mkconfig -o would not update grub.cfg

Problem is that when I want to generate grub.cfg to load Xen kernel it just ignore the priority set at /etc/grub.d/. As far as I know grub-mkconfig should put 10_linux_xen in the grub.cfg but it ...
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46 views

Importing KVM image files (vda drives) as Xen image files (xdva drives)

The other way to title above question was to say KVM to Xen migration. However I wanted to avoid duplicating KVM to Xen migration which seems pretty old. Let me describe my problem. I am running ...
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77 views

xen:libxl__device_pci_reset: The kernel doesnt support reset from sysfs for PCI device

i am launching VMs on XEN hyperviosor with PCI passthrough to the VMs. attaching the PCI ID to the VM while launching, VM is successfully created and lspci in the VM verfies the Vf is attached. ...
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122 views

Xenserver 7 does not see new raid array just added on Dell R710 server

I have a question regarding how Xenserver 7.0 sees and add local storage raid arrays from a Dell R710 server. Originally, the server came with a raid 5 setup of 4 hard drives, for a total of 800GB of ...
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466 views

Convert VHD with LVM to qcow2

I have cloudstack installation with XEN running as hypervisor and VM has vhd image format. My goal is to move VM to the KVM hypervisor and qcow2 image format. To convert from vhd to qcow2 I'm using ...
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49 views

Prometheus' node-exporter, missing diskstats metrics on Xen VMs

For some reason, diskstats metrics are missing from my Xen VMs. Same node-exporter with identical settings works fine on VMW VMs. I am not using selinux or apparmor. Has anyone experienced this? ...
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36 views

Routing from a Xen VM on a private network to the internet

I'm wondering if you can help me. I'm currently trying to setup a Xen hypervisor on a dedicated server that has a mix of public and internal servers. I'd like VMs on the internal network to be able to ...
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34 views

Xen VNC doesn't show frame buffer, only VGA

I'm having difficulties getting VNC to work properly on a Xen server. This happens on three independent servers, one Debian 9 Xen 4.8, one Debian 8 Xen 4.4 and one Ubuntu 14.04 Xen 4.4. The issue is ...
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64 views

The setting could not be created error message

Whenever I open Word or attempt to change the Autorecover files location I see an error that just says The setting could not be created. The only option is to press OK. The location is set to C:\...
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1answer
19 views

Retrieving libvirt-commands to hypervisors

Libvirt is cool, but I need to port a VM from it's configuration to bare QEMU or Xen. To reproduce the setup, I need the commands send to the specific Hypervisors in order reproduce the VM in the ...
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21 views

Eaton IPM can't connect to Xenpool with Citrix Xenserver

I am trying to use Eaton IPM with Ctrix Xenserver to measure how effective Eaton IPM is at reducing energy usage. I have three Xenservers hooked up in a Xenpool and Eaton IPM and Xencenter installed ...
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48 views

Xen VM Machine performances Slow while second machines turn on

Actually If i try to access Second VM Machines at same time means getting performance issue,Even not able to access the application in the VM . I'm very new to this , So could n't find exact issue , ...
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1answer
311 views

Running pfsense on a xenserver - Random network drops?

I have a Xenserver with two NIC's. The first one is connected directly to my buildings router, and the second one is connected to my a switch powering my home LAN, and is set up as the management ...
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144 views

How to install OpenBSD 6.2 guest in XenServer 7?

I'm trying to create new VM from vanilla OpenBSD 6.2 install CD on XenServer 7. I can't even boot install CD. Basically, i get this: Boot device: CD-Rom199MB medium detected - success. CR-ROM: ...
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1answer
55 views

Good approach for installing Openstack on Xen

I'm new to Openstack and I've one physical server with Xen installed on it .. My idea is : I want to use openstack in order to create compute instances on my server (Xen) but actually i'm not sure ...
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2answers
211 views

XenServer Nic Bond; Guest Network Speed?

In my XenServer 7.3 I have 4 Intel 1G network adapters. I configured Nic1 as Management and Nic0 & Nic2 as a LACP Bond based on IP and port (On my Cisco L3 Switch I did the same for the two ...
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1answer
154 views

How big is grub2?

Due to "Meltdown" I am in the progress of moving our CentOS7-XEN-PV-DomUs to HVM mode. See here on why I need to migrate to HVM This involves installing a bootloader - unnessesary on PV-DomUs, since ...
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2k views

Meltdown & Spectre - Does patching the guest kernel of an unpatched hypervisor prevent cross-VM memory leaks?

24 hours after the wide scale release of the vulnerabilities, Rackspace is silent about Spectre and Meltdown. They do not have a plan for patching all of their Xen hypervisors. All their newer ...
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118 views

Xen PVM host showing wrong info about Cpu core and socket

I have XEN install on a machine which has 2 sockets of 4 core each. So total 8 core and each core have 2 thread. So the server have 48 logical CPU. [root@xen ~]# xm info release : 4.1....
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Debian Xen - One VM routings stops working randomly

I have a server installed Debian Xen 4.1. I will refer to this server later with letter A. The server has two virtual servers running. Let's call these servers with letters B and C. All servers A(...
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122 views

Xen guest (ubuntu) does not reboot with 'no bootable device.' after change of disk size

I just increased the size of a disk in a xen (server 6.2) guest (ubuntu 14.04). After the guest shutdown it did not boot up again with the error: 'no bootable device.' Does anybody have an idea how ...
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36 views

How do I set a public IP address for a guest os on Ubuntu Server 16.04

I've been struggling for the past two days to make this configuration. I have a server with 2 ports: - ens2f0 who needs to be used for assigning real IP address - ens2f1 who is connected with local ...
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23 views

Networking between guests on Xen hosts connected by direct wire

I have two Xen hosts connected by a direct ethernet wire (xenbr1) besides their internet connection (xenbr0). The VM-s are connected to a virtual NIC (xenbr2) and access the internet using iptables ...
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42 views

How does Xen emulate devices/network in para-virtualisation cases without Qemu?

In case of running para-virtualised VMs on KVM, we use virtio as PV drivers, Qemu as an emulator and hardware acceleration to provide a solution for para-virtualisation. In case of Xen, they have ...
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2answers
522 views

How to import VMs from files on NFS server local to XenServer

I have a XenServer running in my co-location rack and my XenCenter is running at home and connected to it. What I am trying to do is create some VMs by importing XVA files, but those XVA files are on ...
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1k views

Multiport Server NIC ports?

I need to buy multiport NIC, because I need to replace 4 NIC with one. For example they are: https://www.amazon.com/HP-NC364T-Gigabit-Server-Adptr/dp/B000P0NX3G https://www.amazon.com/Intel-1000-...
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43 views

USB devices don't show up in domU

The command xl usb-list is showing that I have successfully attached a USB device to one of my domain's controllers, but it doesn't show up when I run lsusb on the guest, and lsusb in fact exits with ...
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55 views

Xen hosts don't see each other in broadcast domain

I got this problem, that I can't resolve. There are 3 standalone XenServer hosts. They dont share storage. Every host has four NICs bonded in LACP and connected to Cisco 4500. The bonds are in trunk ...
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2answers
594 views

NUMA placement failed, performance might be affected

I'm running SuperMicro 6048R-E1CR36H Storageserver on Ubuntu Xenial 16.04.03 LTS and Xen Kernel: 4.4.0-97-generic Xen: xen-hypervisor-4.6-amd64:amd64/xenial-security 4.6.5-0ubuntu1.2 Problem: when ...
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89 views

XEN Server 4.4.4 - Cannot create disk partition

In an Oracle VM Server we created a 2nd partition on /dev/sdb, now we want to create the ext4 filesystem on it, but mkfs -t ext4 /dev/sdb2 returns this: mke2fs 1.43-WIP (20-Jun-2013) /dev/sdb2 is ...
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1answer
38 views

Xen guest networking model

It's time to replace old server with new one. In old server all was setup on bare metal. With new server I try to set up virtual server for specific task. Host OS is Debian 9. Guests I will run in ...
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1answer
284 views

How to combine disks from XEN-hosts into one storage? [closed]

We have 4 servers with XenServer 7.x installed. Each server has a large disk (6TB - raid10). How can I combine these disks in one big storage for sharing? This should be an analog of vSAN from VMware.
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1answer
256 views

iostat reports significantly different '%util' and 'await' for two identical disks in mdadm RAID1

I have a server running CentOS 6 with two Crucial M500 SSDs configured in mdadm RAID1. This server is also virtualized with Xen. Recently, I started seeing iowait percentages creep up in the top -c ...
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26 views

Multiple VPS with their nameservers+FTP+etc under same IP

The setup I'm trying to create: a single physical dedicated server with a single public IP a number of hosted virtual machines (DomUs, with XEN) running Virtualmin (LAMP + other services), basically ...
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1answer
239 views

Citrix XenServer Upgrade from 6.2 to 7.1 hardware driver crash

I upgraded a XenServer version 6.2 host to 7.1 One of the VMs (CentOS 6.9, PV type - paravirtualized) on the host runs Asterisk phone software which uses a module called "DAHDI" which is a set of ...
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1answer
462 views

“Logical volume in use” — cannot remove logical volume

On a Xen 4.8 hypervisor, running on Debian Stretch, I am trying to remove the logical volume of a domU that is no longer used. I stopped the domU and successfully removed the logical volume for the ...
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215 views

Configuring xen hypervisor with multiple NIC

I want to configure xen with 2 NIC. The dom0 is configured with CentOS7 where the interface eth0 is facing the local LAN (10.12.X.X) and the eth1 (192.x.x.x) is connected to the corporate LAN. Dom0 ...
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1answer
214 views

How to pass an ignition.json to a Xen CoreOS DOMU when using libvirt or `xl`

I have a baremetal server with Xen, and Debian 9 as DOM0. This server has libvirt, and I can happily create PV domains by using xl, virsh or remotely using virt-manager. I want to streamline coreos ...