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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Xen xl console terminates upon reboot command

I am trying to troubleshoot the boot issue of Xen virtual guest and I need to access the grub menu. I have attached a console to guest with xl console and in other terminal I have executed a command ...
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Is “CPU MHz” from /proc/cpuinfo correct in Xen Dom0?

xenpm get-cpufreq-para indicates that I'm using the ondemand governor (set by cpufreq=xen:ondemand). The output also suggests that the CPU is running at 1.2GHz: scaling_avail_freq : 2000000 1600000 *...
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Xen VM continuously restarts and kernel fails to start init

I am using a VM built using the Xen hypervisor and libvirt management layer. I couldn't connect to the VM after updating the Debian verison from 8 to 9 so I tried logging into the physical machine the ...
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LVM IO Errors Xen Guest (Buster)

I have been running diagnostics on all of my disks, and am down to 2 new seagate 4TB drives, and a Samsung EVO 850 SSD. These all report no errors when running a thorough diagnostic in the Dell Setup ...
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Workstation virtualization on workstation host

Problem exposition I am a system administrator in our company, and I am currently researching a possible solution for more stable workflow in a our company. Our company is a chain of hundreds general ...
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Is it safe to mount the same partition to multiple VMs?

I'm using ubuntu 20.04 with Xen Hypervisor. On my machine I have an SSD that hosts my VM images, and then four sata drives which I have data on. My current set up is to mount the data on my domain0 ...
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89 views

Xen Domain0 Has Network But DomainU does not

After re-installing my domain 0, a guest VM (domain U) is no longer able to connect to the network. I am using Ubuntu 20.4 on my Domain 0 with Xen 4.11. I am able to successfully connect to internet ...
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Dead Citrix XenServer with LVM: How to get the VHDs off the system?

My company recently delegated the task of recovering a fairly old (~2015) Citrix Xenserver to me. The machine had a major electrical fault which caused a hard drive failure and a collapse of the RAID. ...
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Tool to maintain IBM x3650 - get info from faulty HW

I am have a server IBM x3650 M4 running XenServer and Windows guest. The server have a problem with harddrive, yellow exclamation mark blinking. I am able to turn off the server go to BIOS and get ...
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133 views

Why can't I boot xen hypervisor on Ubuntu 20.04.1? panic on cpu 0 timer doesn't work

As the subject says I simply cannot boot into the hypervisor. I'm able to install it just fine though, it says something about the CPU when I try to boot and quickly just reboots. I have ...
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xen VM boot logs - how to locate

Working with a VM that starts to boot and then promptly shuts down. Hoping to locate VM boot logs on Xen host but not sure where to look. Examining /var/log/* doesn't show anything obvious. ...
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How do I manage xen-hypervisor using virt-manager client?

I've installed xen-hypervisor 4.11 on my debian 10 desktop. But, when I add xen connection to my virt-manager it shows this error. Unable to connect to libvirt xen:///. Failed to connect socket to '/...
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116 views

Resizing Ubuntu Server partitions in a Xen environment

I need to increase an Ubuntu partition, in a Xen environment. Through XenCenter, I increased the disk, from 10GB to 100 GB. Now I can see "xvda" size 100 GB. For reasons I don't know, in ...
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libxenlight state driver is not active

I'm trying to create a new xen connection with virt-manager on ubuntu 20.04. At the beginning it didn't work because this error : "failed to connect socket to '/var/run/libvirt/-virtxend-sock. ...
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353 views

Failed to connect socket to 'var/run/libvirt/virtxend-sock': file or directory not found

I want to boot a physical installation of windows 10,so I need to run xen HVM version. Do u have a tutorial that I can follow ? I'm trying to create a new connection inside virt-manager,with xen,on ...
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1answer
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XenServer (Citrix) Management Network Interruption

We have an OOB/management network we use to loginto storage, hosts etc. We're using VLANs to separate out storage, from hosts, to camera's etc. We would like to replace this switch with a new one ...
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1k views

How to get (Citrix/Xen) 'xe' tool on CentOS 7

I have an Xen 7.6 cluster and I need to update the patches. Where do I get the 'xe' application from (for CentOS 7)? I see references to the 'guest-tools' that get installed to manage new VMs but this ...
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GPU Passthrough on Xen Hypervisor

I have a Dell PowerEdge r710 running the Xen hypervisor and I want to get a decent graphics card for a virtual machine. I plan on doing GPU passthrough to dedicate the entire GPU to the virtual ...
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976 views

Compatible AMD GPU for the Dell PowerEdge r710 [closed]

I'm a complete noob when it comes to server virtualization and GPUs, so please bear with me. Are there any decent AMD GPUs that are easily compatible with the Dell PowerEdge r710? I'm looking for ...
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Booting an older kernel in Xen DomU when using pvgrub in Dom0

I'm having issues with the lastest kernel update in a Debian Jessie DomU, and want to boot it using a previous kernel. Dom0 is also running Debian Jessie, and is booting the DomU via PvGrub. I'm ...
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286 views

How to load additional modules when Xen hypervisor is loaded?

I'm currently running Debian 10 with Xen 4.12 installed. I compiled Xen from source on another machine with the below steps: ./configure --target=x86_64 --with-platform=efi --enable-systemd make ...
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How can I stop Freenas from assigning two disks from different SATA controllers the same device number?

I have Freenas running in a VM in XCP-NG. I've followed the guides and I've dedicated a SATA controller to it using PCI-passthrough. Freenas correctly discovers its boot disk, which is virtual, and ...
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1answer
289 views

Issues with vif-nat and Xen after upgrading from Debian 8 to 10

I'm getting this error when running xl create: # xl create ../vm-www.rootspirit.com.cfg Parsing config from ../vm-www.rootspirit.com.cfg libxl: error: libxl_exec.c:118:libxl_report_child_exitstatus: /...
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202 views

XenServer 8.0 running a NTP client in guest PVHVM VM

I would like to run a NTP client in a Xen Linux VM under XenServer (XCP-NG 8.0 to be precise). The Linux VM, Debian Stretch 9.9 (uname -a: Linux debian 4.9.0-9 amd64 #1 SMP Debian 4.9.168-1+deb9u4 (...
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132 views

Is PCIe passthrough on Citrix Xen Hypervisor persistent?

I am virtualising my firewall, NAS and other services to reduce hardware diversity. Specifically I want to run at least PfSense and OpenMediaVault over Citrix Hypervisor (v8 at the time of writing). ...
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1answer
682 views

Cannot Connect to XenServer from XenCenter

Setup; - XenCenter (running on a Windows PC) - XenServer (installed via APT on Ubuntu 18.04 using the command, sudo apt-get install xen-hypervisor-4.9-amd64 I can SSH into the server fine. ...
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206 views

xenserver-iso: Error downloading: open : no such file or directory

I'm trying to build a "vdi_vhd" image using packer on xenserver,but i have got the below error, could you please anyone help me on this,Thanks in advance. [root@localhost bin]# packer build /usr/...
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269 views

Storage Setup for iSCSI/NFS servers

We are preparing to replace our storage servers (iSCSI+NFS). The current servers are Debian Wheezy using mdadm+lvm2 for storage, and failover using drbd and heartbeat (never got heartbeat to work). ...
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126 views

Migrate From Xen LVM to Citrix Xen

I need to migrate some production vm's from Xen 4.2 to Citrix Xen 7.1. I have very little experience with Xen. The VM disks are LVM, see below info. One possible solution might be to do the following ...
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65 views

Installation of virt-manager while yum update and yum install rhvm does not work

I have downloaded RHEV-H 4.2 https://access.redhat.com/products/red-hat-virtualization#getstarted (RHVirtualization 4.2 Host and Manager iso). I uploaded the image and installed on an HP G9 server ...
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1answer
146 views

Xen automatic dom0 IP assignment on a SSPN (Single-Server Private Network)

I'm currently using XCP-ng 7.6.3, and wanting to add a little security and take advantage of traffic shaping, I decided to PCI pass-through the NICs. In order to be able to reach the dom0, I created a ...
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249 views

Edited guest xml with 'virsh edit' to add ttyS0 but ttyS0 is not added

I am facing the errors in /var/log/messages like: Feb 19 20:19:42 guest-dp init: serial (ttyS0) main process (608881) terminated with status 1 Feb 19 20:19:42 guest-dp init: serial (ttyS0) main ...
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1answer
781 views

Getting errors when try to start Debian XEN HVM VM with more than 4 vif's

I've been trying to set up a PfSense firewall on my Debian XEN server for some time now, this works fine until I try to add a fifth (with four it works) interface to the "hvm" VM, then the VM won't ...
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110 views

Performance issue with debian guests on xenserver with iscsi storage

I am facing a performance issue with my small virtualization environnment. I have two Dell PowerEdge 2950 and a Qnap TS-453-BU. The Dells are equipped with XenServer 6.5.0 and they are attached to an ...
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1answer
269 views

Storing Xenserver VM Snapshot UUID as a variable in a shell script to create .xva files from snapshots

I was looking at this question which was asking something sort of similar for help and is the closest thing I could find to helping, but it doesn't solve my issue: export XenServer snapshot as file ...
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627 views

LVM snapshot gets created in a dirty state and cannot be mounted in XEN

I have a server which runs Xen 4.9.2 with Linux Ubuntu 18.04.2 installed in Dom0. There is one virtual machine (DomU) with Linux Ubuntu 12.04.5 that uses LVM logical volume as its root filesystem. ...
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455 views

How to find out RAM speed and L2 L3 cahce sizes of AWS EC2 & lightsail instances

On my desktop $ sudo lshw -short -C memory H/W path Device Class Description ======================================================== /0/0 memory ...
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277 views

Partially working network bridging - Ping works but services can't connect

So, here's the setup - I have a network with a Xen host on it. The Xen host is configured to bridge between the physical network and hosted VMs. i.e. [Network] <-----> [Xen DomO / Bridge] <----...
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314 views

Fedora - Configuring as a Xen Host (EFI preferable)

I've got a new Fedora box that I'm setting up as a Xen host (Dom0), which is proving a little more difficult than expected. First stop - install Xen via DNF and reboot. Find that the Xen boot option ...
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1answer
743 views

VM transfer speed between XCP-ng (XEN) servers

I have two HP DL380 G8 servers with 4x 1TB on HP p420 RAID controllers in RAID 1+0 setup. Eth0s are connected to the router, and Eth3&Eth4s are bonded (LACP) and connected directly between ...
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1answer
172 views

How to fix SolusVM Xen-Hvm template error at creation?

The following log contains an error which happens while executing the template creation script on a SolusVM powered CentOS 6 server. CREATING MBR IMAGE... 1+0 records in 1+0 records out 512 bytes (...
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153 views

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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175 views

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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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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265 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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509 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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2k views

Adding a bridge kills the internet connection from all interfaces

I'm working on Debian stretch with the newest xen from repositories. Installing xen-system and xen-tools gave no errors, though when I try to start a guest (we'll call it dom1) it won't work unless ...
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1answer
52 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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206 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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730 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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