Questions tagged [virtualization]

Virtualization is a group of software technologies that allow abstraction between layers of a system. This allows separation between the logical layers of the system, providing isolation, flexibility, and/or the ability to run more than one at a time. This differs from most traditional systems where the various layers are inherently tied.

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Traffic not passing through Opnsense firewall in Hyper V

I'm configuring Opnsense in Hyper-V. It is connected to the DMZ on one interface, and the internal network on the other, with internal switches for the VMs. There are VLANs setup and working fine. The ...
0 votes
0 answers
38 views

VirtualBox randomly resets VM's network

I have a VM which is running by VirtualBox 6.1. Ubuntu Server 18.04 is installed on hypervisor and Ubuntu Server 22.04 is installed on VM. The internet on VM works through "Host-Only Adapter"...
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0 answers
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ICMP request | By Virtual NIC | no response

The Issue: I want to Understand what's going on when I'm sniffing from the host machine with Wireshark for instance packets that are coming from the VM that is bridged directly to the physical network....
0 votes
2 answers
533 views

how to convert .tib fille to .vhd/.vmdk

I#ve been looking for ways to convert a .tib file to a .vmdk file, however all solutions i was able to find on the topic rely on old discontinued software that i can no longer find online (for example ...
9 votes
4 answers
1k views

What is the the purpose of using paravirtualization if there is a hardware assisted virtualization?

I am doing a research about QEMU/KVM and Firecracker/KVM. As far as I understood, both Firecracker and QEMU communicates with KVM to eventually benefit hardware assisted virtualization by changing CPU ...
0 votes
1 answer
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VPN SSTP windows client can not ping or connect to VPN server but it can talk to every other PC on the local LAN that VPN server is on

So I have an SSTP (with native Windows client) working fine in a sense. My windows client's local IP is 192.168.10.11 , so its local network is: 192.168.10.x The Remote VPN server is behind a router ...
4 votes
3 answers
18k views

(KVM) virt-manager stuck in password prompt after open VM

so i installed a fresh ubuntu server 14.04 with KVM, i'm connecting with my other ubuntu machine using virt-manager. so after i had permissions problem creating a new VM, i uncomment user="root" and ...
0 votes
1 answer
44 views

Centos 7 - where else to look for a difference in network setup

I have 2 Hetzner dedicated machines with public ip4/28 address ranges. Both were working with Centos 7.8, vagrant and Virtualbox - I could create vms with public IP addresses. I wiped one and set it ...
2 votes
2 answers
228 views

bridge for virtualisation stays in state DOWN - unable to get it up

Running Rocky 9.3, attempting to get a bridge for a public Range of IPs for use with Virtual machines. Same hardware used to run Centos 7.8 machine with it all working, am now trying to set it up the ...
0 votes
1 answer
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Explaining why setting up a WiFi connection that interfaces with a virtual bridge in Linux is problematic

Just like you can bridge two wired ethernet interfaces, you can bridge between an ethernet interface and a wireless interface. However, most Access Points (APs) will reject frames that have a source ...
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Unable to reproduce CentOS 7.8 public IP routing network in Rocky 9.3

I have 2 servers. Both were set up the same and were working on Centos 7.8. I have re-imaged one machine using Rocky 9.3 and have been unsuccessful in getting the public IP routing to VMs to work. The ...
2 votes
3 answers
25k views

System time is wrong in Proxmox VE host, how can I fix it?

I'm using the latest version of Proxmox VE (which is based on Debian) and I can't fix the wrong time problem: $ pveversion -v pve-manager: 1.7-11 (pve-manager/1.7/5470) running kernel: 2.6.32-4-pve ...
11 votes
5 answers
92k views

VMWare ESXi: how to add network drivers to installation?

Background / Problem I have two new servers (Dell R720 & Dell R520) that I plan to install ESXi onto. During the VMWare Hypervisor installation, I'm told that no network adapters exist. Upon ...
0 votes
1 answer
135 views

How to bind mount /sys/kernel/debug with systemd-nspawn?

--bind /home bind mounts /home, but --bind /sys/kernel/debug only leads to an empty directory. Any other options needed? Thank you!
8 votes
1 answer
11k views

ZFS inside a virtual machine

Should I use ZFS inside a virtual machine? According to existing information (in particular this thread, which I will quote below) it is not a good idea, unless certain measures are provided (such as ...
23 votes
8 answers
276k views

How to extend a Linux PV partition online after virtual disk growth

VMware allows to extend the size of a virtual disk online - when the VM is running. The next expected steps for Linux system are: extend the partition: delete and create a larger one with fdisk ...
1 vote
1 answer
349 views

Managing Orphaned .avhdx Files in Hyper-V with PowerShell

I'm managing a Hyper-V environment and looking to clean up my hard drive to free up space. Specifically, I want to delete orphaned .avhdx files and possibly move some to external storage. I prefer ...
4 votes
2 answers
2k views

QEMU and SPICE on Win 10 host

I am trying to run a Linux kernel based VM image (1) using QEMU on Windows 10 host. I have installed QEMU from https://qemu.weilnetz.de/w64/qemu-w64-setup-20190815.exe and SPICE client from https://...
0 votes
1 answer
2k views

Checking if NIC controller has SR-iov capability

I'm trying to use SR-IOV with openstack, and in order to check if the NIC available on my servers support this technolony I did the following: (venv) [root@controller share]# lshw -c network -businfo ...
0 votes
1 answer
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ceph "permission denied" when adding storage OSD

I just setup three storage nodes for ceph in a qemu/kvm environment to learn about it. OS is Ubuntu Server 22.04 LTS. The ceph and ceph-common packages are from standard repos. I followed the ...
1 vote
1 answer
57 views

Set Maximum cpu qemu/libvirt almalinux

I want ask to increase supported CPU core on qemu kvm. When I creating new VM I see error like below error: internal error: QEMU unexpectedly closed the monitor (vm='ID'): qemu-system-x86_64: -accel ...
-1 votes
1 answer
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Understanding CPU steal time in cloud

I am trying to understand about CPU steal time. This article is the top result: https://scoutapm.com/blog/understanding-cpu-steal-time-when-should-you-be-worried To be honest, I do not understand the ...
5 votes
2 answers
5k views

Is it possible to tell which cpus are hyperthreads of the same core?

I have a server that is a quad-core i-7 with hyperthreading enabled. The kernel recognises this as 8 cpus, as it should. I want to create a couple virtual hosts running on this machine. virt-manager ...
1 vote
2 answers
4k views

virt-install: error: unrecognized arguments: (but no arguments listed)

Been trying to create my first VM with KVM but getting a cryptic error from virt-install. It's saying I have a 'unrecognized arguments' but does not say which argument: $ sudo virt-install \ >    ...
2 votes
2 answers
299 views

Modify VM in OVA

I have an OVA that contains a vApp with 9 VMs inside. I need to make a change to the drive contents of one of the VMs in the OVA. The OVA takes a very long time to export from vSphere (24 hours). Is ...
1 vote
1 answer
536 views

What does Sourcing of eucarc mean?

I am trying to setup an on premise cloud by using Eucalyptus. I am following the following link Now in that guide I am not able to figure out what this means: ensure that the environment variables ...
0 votes
1 answer
49 views

Exploring Advanced CPU Virtualization: Amalgamating Cores for Enhanced Performance [duplicate]

Virtualization experts! I have a question that revolves around a potential CPU virtualization concept illustrated below. Is there an existing implementation of this idea, or are there hardware ...
0 votes
0 answers
32 views

Installing CentOS and Windows Server on the Hypervisor [duplicate]

Hello Server Fault community, In our company, we are planning to install an ERP system, and the system provider has specified the following server requirements of the application: CPU: 1x CPU Intel ...
21 votes
2 answers
19k views

Is the Amazon EC2 instance id unique forever?

We're using amazon EC2 and we want to keep track of instaces. Is the Amazon EC2 instance-id unique forever? i.e. If a VM has an instance id of i-12345678 is there a guarantee that when that instance ...
14 votes
8 answers
32k views

Get list of DHCP clients with KVM+libvirt?

I have several VMs running on Ubuntu 9.10 via KVM+libvirt. I want to be able to find out the IP address that has been assigned to each host without physically opening a physical "console" to each ...
127 votes
18 answers
304k views

How do you increase a KVM guest's disk space?

I setup an Ubuntu guest on a CentOS KVM host with initially 6GB of disk space. How do I go about increasing the Ubuntu guest's disk space from the command line? EDIT #1: I'm using a disk image file (...
1 vote
0 answers
28 views

Looking for a good approach to set up an F5/Netscaler lab on MacOS (docker + virtualuzation)

To explain myself - I mainly work with Load Balancers - up to now I used VMWare to set up a local lab with couple of F5s and Netscalers, some web server in the backend, and from time to time a Windows ...
0 votes
1 answer
47 views

How Windows Host can access Guest OS by name

The host OS is Windows, Guest OS is Linux running on VirtualBox. I setup Network and can access the Guest OS from the Host by IP address. Let's say this is IP 192.168.22.10. This part makes sense ...
1 vote
1 answer
7k views

Permission denied for root to ESXi host

I have an ESXi host running a Windows 2008 R2 server VM with vCenter installed. Upon joining the Host to vCenter, suddenly I could not log directly onto the host with the vSphere client using my ...
3 votes
2 answers
11k views

How to build a custom LXD image from install ISO

I have an operating system installation ISO. My goal is to run the second operating system on top of the kernel of Ubuntu host running LXD. I cannot find any base image for the said operating system. ...
0 votes
1 answer
4k views

Error while creating VM using virt-manager on Xen

After a great struggle I got my XEN installed now I am using virt-manager and trying to create a VM. Since my H/W doesnt support full Virtualization using the Para Virtualization installation over ...
0 votes
0 answers
38 views

Move applications and DB to docker or vm

I have one server with one public IP. Apache2 is installed. Mariadb is installed. There are about 50 identical Java applications running on Tomcat on the server. The applications are running on some ...
0 votes
0 answers
128 views

Nvidia-smi missing GPU with SR-IOV disable in bios

I have a HPE serveur (DL385) with 3 Nvidia A100 in it. It is running ubuntu 22.04 with kernel version 6 (I have tried with the 5). By default, it was in energy saving mode in the BIOS. When I tried to ...
0 votes
0 answers
180 views

Veeam replica timeout

I'm encountering an issue during a Veeam replication job, specifically a "Preparing replica VM Error." The error message indicates: "A connection attempt failed because the remote site ...
0 votes
1 answer
3k views

KVM: qemu-system-x86_64: cannot set up guest memory 'pc.ram': Cannot allocate memory

When trying to start a VM (1GB allocated) I have run into memory allocation issue even though I have more than enough memory on the system (16GB): error: Failed to start domain exampleVM error: ...
1 vote
1 answer
153 views

Filter packets with iptables on a tap interface

I'm trying to write firewall rules to prevent a guest machine from accessing the internet. The server (Ubuntu server 22.0, using KVM) has a physical connection (enp34s0), which is connected to the ...
1 vote
2 answers
34k views

How to fix "ERROR [internal] load metadata for docker.io" error while using Docker?

I am compiling sources of one cosmos-based blockchain projects on my MacOS. This project using Docker. I installed Docker and it seems running properly. But at the and of compiling I got this message ...
1 vote
1 answer
278 views

ESXI RAID : add an extend to existing VMFS datastore

I noticed in ESXI (6.5) there is option to create something like software RAID, but it is called "Add an extent to existing VMFS datastore", does anybody have experience of what it does and ...
5 votes
1 answer
223 views

The GPU usage provided by nvidia-smi command is very different from GPU metrics from guest OS

I'm working on a project that can monitor virtual machines' vgpu usage. The hypervisor is vCenter, we have nvidia A16 cards installed on vCenter hosts, and assigned a16 vGPU to a couple of windows VMs ...
-1 votes
1 answer
57 views

How to manage hardware resources efficiently in a cloud gaming service?

I am creating this small cloud gaming service (GeforceNow wannabe) which is powered by windows 10 Pro and VMWware. All other aspect of it is taken care of, Like streaming and data compression and etc. ...
1 vote
3 answers
261 views

In cloud, is it possible to access guest VM from host machine?

In KVM, it is possible to access the guest machine from the host machine. For example, you can SSH to the host machine and then access the guest VM by virsh console vm_name. Is that possible in cloud? ...
1 vote
3 answers
17k views

Afer upgrading qemu, "unsupported machine type 'pc-i440fx-3.1"

I recently installed the latest version (3.1.0) of QEMU, and I have been having trouble getting virt-manager to work correctly, presumably because it isn't connected to the right dependencies. Some of ...
5 votes
4 answers
951 views

Building a low-cost, high-availability cluster using Windows Failover Cluster or Proxmox

I need to build a high availability cluster (key functionality, SLA almost 24/7) for virtual machines (AD DC, FS, WSUS, Print server, one Oracle database, a few Linux (not important to business). ...
0 votes
1 answer
165 views

Internal network drops connection to our own locally hosted web server on a disjointed network

In time I have my internal network drops all connections to my locally hosted website. After rebooting the web server all internal connections to the website works again, but it is only a matter of ...
0 votes
0 answers
208 views

KVM guest/VM use host/physical VGA port

Is it possible to use the physical video interface (hdmi or vga, onboard), so that a VM can be viewed/used thru it? What I want it to plug a monitor on the host and see the VM graphical interface.

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