Questions tagged [virtual-machine]

A virtual machine (VM) is a guest Operating System running in a completely isolated environment within a normal host operating system. Modern virtual machines are implemented with either software emulation or hardware virtualization or (in most cases) both together.

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Unable to uncapture the mouse pointer in QEMU KVM on CentOS 7

I am unable to see the mouse pointer on the console while on KVM Virtualization. I have tried the Ctrl-L+Alt-L but that does not work.
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87 views

How does Docker run GUIs?

I wrote some Java desktop applications and thought I'd run them with Docker to learn about containers. I got the Java applications into a Docker container with an ubuntu image. And that's when I ...
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Diskimage (qcow2) size on NFS in the context of virtualization

We are running a KVM virtualization platform with NFS as storage backend. The disk images are qcow2 files (This is "as-is" and we cannot change the setup). Now we need to move a rather large VM with ...
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1answer
34 views

During automated RHHI installation, what do they mean with 'Virtual Machine Mac address'

When I want to run the ansible scripts for automatically installing RHHI on my physical (RHEL+KVM based) hosts. They ask to edit a json file in which I am required to give the FQDN and MAC address of ...
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54 views

Fedora 29 qemu time problem

Since i upgraded my workstation from fedora28 to fedora29 i encountered a problem with my virtual machine which is running on my workstation. I am using this virtual machine for browsing in the ...
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CPU usage increases on all guests if 1 guest has high usage (QEMU-KVM) [closed]

The point is that if I utilize the CPU on 1 guest, all the other guests see increase in CPU usage. I'm testing with stress-ng, but it's visible with normal workload as well. I really don't know if ...
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171 views

After installing Clear Linux on VMware Player 15, it launches the installer again

I'm trying to download clear linux on my VMware player 15. I got windows 10. But each time I press "install", it installs the files of the OS, and then I press "Reboot" when it's finished, but it ...
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373 views

Why is a machine of type i440fx created when I specify q35 and how do I get q35 to work?

I need to create a Windows VM with a Q35 machine type. However, in spite of specifying q35, and i440fx machine is created. created with: sudo virt-install \ --name wintest \ --boot uefi \ --ram ...
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1answer
28 views

C-state in VM: needed or no?

Would it cause any difference if the cstate is enabled or not on a VM? cat /sys/module/*_idle/parameters/max_cstate So not on the hypervisor, rather on a VM. Any virtualization, question in ...
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56 views

VMware Workstation guests NAT adapters always got the same IP address

I'm on Windows and created three Ubuntu 18.04 Desktop virtual machines using VMware Workstation. This is my NAT and custom host-only network configuration. This is my guest VM's network adapters. As ...
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79 views

Can I run a .vdi file for Windows 8.1. virtual machine in KVM/QEMU or VMM?

Can I run a .vdi file for Windows 8.1. virtual machine in KVM/QEMU or VMM? Do I need to convert the file from .vdi to some format familiar to KVM/QEMU? What are the steps, if possible? I have ...
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What are the processes started for running a virtual machine under Virtual Machine Manager?

I am trying to figure out what processes are run when I start a KVM virtual machine under Virtual Machine Manager. Are these all the processes started for that purpose? What do they do respectively? $...
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1answer
181 views

What is the relation between Virtual Machine Manager and KVM/QEMU?

What is the relation between Virtual Machine Manager and KVM/QEMU? The Wikipedia links says In computing, the Red Hat Virtual Machine Manager, also known as virt-manager, is a desktop virtual ...
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1answer
310 views

virsh: Connected to domain <name> Escape character is ^]

I'm having an issue with viewing output from a virtual machine installed via virt-install. I first used this method, but it left me with the following immediately after running: Starting install... ...
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Increasing the size of RHEL virtual hard drive in Virtualbox? [duplicate]

My host OS is Ubuntu and on top of that I'm running Oracle Virtualbox with RHEL7.5 Workstation. The original amount of space that I allocated was 47GB. I increased that to 80GB by doing: However, ...
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202 views

Linux Mint on Virtual Box Display Bug

I've run into a small problem when I launch Linux Mint on Virtual Box. During bootup everything seems to be fine. Linux mint logo appears and counts down from 9 until automatic boot, during boot 2nd ...
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58 views

Black screen while emulating buildroot built kernel on QEMU

Till this date I was only able to emulate the RPI kernel but I want to emulate BeagleBone Black & i.MX based firmwares that I've built using buildroot. I'm passing the following command:-- qemu-...
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711 views

Run VM GUI on headless machine with kvm

Priorities: Security has high priority in all aspects. Scalability, ease of use and price are close seconds and performance also have a say. What I am trying to do: I am trying to run a minimal (...
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3answers
53 views

disk partitions don't mount to filesystems after reboot

i have a VM machine that rebooted last night and we could't connect to it via ssh. i used console and saw that only / and swap are mounted with lsblk command: NAME MAJ:MIN RM SIZE RO TYPE ...
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1answer
135 views

Render Linux VM applications on Windows Host Xserver

I have a Ubuntu VM on VirtualBox running in headless mode. Host is a Windows 10 machine. I want to be able to render Ubuntu's applications on Windows using XServer. Currently, I tried this: ...
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How to solve gptboot: No /boot/loader on 0:ad(0p2) issue while installing Freebsd?

I have installed FreeBSD 12.0 in vmware virtual machine. After installaion, I am getting below error while booting. gptboot: No /boot/loader on 0:ad(0p2) gptboot: No /boot/kernel/kernel on 0:ad(0p2) ...
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160 views

How do I run a raw file in qemu? [closed]

I have been trying to run this project from github. https://github.com/asafch/xv6-paging My machine is running ubuntu 18.04, so this code isn't running here. I have seen this solution Booting a raw ...
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1answer
86 views

Touchscreen virtual for Linux

I have this Website , I want my Website to work on Tablets too, I don't have a tablet... Therefore I am searching for a Virtual Touchscreen or Emulator for Desktops. Because i have my website to ...
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1answer
74 views

Can I save the working status of Ubuntu before reboot, and recover it after reboot?

Is it possible to save the working status of Ubuntu,and reboot it and recover its working status? By working status of Ubuntu, I mean things such as the programs that are running, and the statuses of ...
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2answers
82 views

When choosing a Docker container image file for my Ubuntu, what do I need to match between them?

When choosing a Docker container image file for my Ubuntu, so that it can run on my Ubuntu, what do I need to match between them? Do I need to choose image files for Linux but not for Unix (MacOS, ...
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1answer
26 views

device from free diskspace does not match-up to size from list block size

The device /dev/sda2 original space at 32GB, then I try to expand to 512GB as it is shown in lsblk but not in disk free listing still show 32GB. I've rebooted the redhat 7.6 vm. $ df -h ...
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29 views

Over-allocation of memory in AIX/UNIX

Just finished my research regarding over-allocation's negative impact to VMs (Wintel). Over-allocation - usage is 2vCPU | allocated is 32vCPU I have not found any link regarding any negative impact ...
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47 views

ARP responses not arriving to virtual interface in Linux

I created virtual interface in Linux from command line, and asked for an IP address from the router with the following commands: ip link add link enp0s3 my-iface type macvlan ifconfig my-iface up ...
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17 views

Is there any way to know when Centos VM was suspended inside VM?

I have Centos VM on Hyper-V. And I want to write script that will restart some service inside VM after VM was paused by hypervisor? Is there any way to make VM know whether it's been paused? Or may ...
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1answer
426 views

How can I enable a virtual machine on KVM to use the WiFi connection on my Ubuntu 18 laptop?

I recently set up KVM hypervisor on my Ubuntu 18 LTS ThinkPad Carbon. I installed qemu, virt-manager, and libvirt to manage the VMs. sudo apt install qemu-kvm libvirt-clients libvirt-daemon-system ...
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464 views

QEMU Commandline arguments to lib-virt are not accepted - unable to save xml file

I am trying to get audio working on a Win10 Guest running on a Ubuntu host following this guide https://blog.zerosector.io/2018/07/28/kvm-qemu-windows-10-gpu-passthrough/ . GPU pass through works ...
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25 views

connect LKVM vms over bridge

I'm using lightweight VM lkvm which creates tun interfaces on the host. Now I want to connect two instances of lkvm over bridge interface, similar to what other VMs do: VM1 ...
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23 views

Where can I find the source code specifically for the minimal debian installer cd?

I want to distribute a debian virtual machine as a OVA file, in order to comply with the GPL I want to provide the source code for debian alongside the debian virtual machine. Instead of downloading ...
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23 views

High swapiness on VM host

Would setting very high swappiness so that more RAM could be assigned to VM impact performance? I would assume that VM related tasks wouldnt be swapped, and the tasks within the VM.
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Whether I can use ipmitool in the VM?

When I start the ipmi_si module: modprobe ipmi_si there gets error: FATAL: Error inserting ipmi_si (/lib/modules/2.6.32-696.el6.x86_64/kernel/drivers/char/ipmi/ipmi_si. My environment is a ...
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35 views

Can OSv UniKernel be run on a Proxmox KVM cluster? [closed]

I have read around and can't see any reason why a proxmox KVM cluster would not be compatible with OSv that can run on KVM but I couldn't find any references to such a set up. I know the kernel is ...
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1answer
25 views

Change storage on KVM

I have virtual machine in KVM "machine01" I have storage on it /data/sas1/virt/virt.qcow2 and not used /data/sas1/virt/virt2.qcow2 I want to change via command line on my supervisor from /data/sas1/...
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142 views

CPU throttling at too low temperature

I'm running linux mint and trying to get a virtual machine to work, but my CPU keeps throttling. I'm tried to run sudo /sbin/vboxconfig but around the "build packages" part it seems like my computer ...
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1answer
138 views

Not able to ssh from VM to VM via linux bridge

I want to able to ssh from VM1 to VM2, both VM are connected to a Linux bridge(br0). Below is my topology VM1(m1)<====SSH====>[br0]<======SSH=====>VM2(m2) 1 Created bridge br0 $ sudo ...
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43 views

VirtualBox failed to open iso? [closed]

When I try to attach an iso, I got the error "could not get the storage format of the medium", and then (VERR_NOT_SUPPORTED), though I am pretty sure the system I chose and the iso match. I am ...
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1answer
124 views

Cannot open a virtual machine

When I try to open a virtual machine, I get the error: "The VirtualBox Linux kernel driver (vboxdrv) is either not loaded or there is permission problems with /dev/vboxdrv. Please reinstall virtualbox-...
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1answer
161 views

Partitioning for Linux From Scratch (LFS)

I'm building the system in VirtualBox with a CentOS 7.5.1804 guest on a Windows 10 host using the v8.2 systemd book (the current is v8.3, but the partitioning content is the same), and I got a little ...
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1answer
446 views

VMs attached to the same bridge cannot ping each other

I am now trying to host two VMs directly by qemu, without any tools like libvirt. I did setup the bridge/tap interfaces for each of them like ip link add br0 type bridge ip addr add 192.168.122.1/24 ...
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261 views

Warning Kvm is Not Available

I am getting this warning message while creating a new VM. below packages are already installed. qemu-kvm-1.5.3-160.el7.x86_64 qemu-img-1.5.3-160.el7.x86_64 Host system Centos 7 lsmod | grep kvm ...
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187 views

QEMU crashed while trying to boot up i.MX6q device kernel

When tried to boot up Kernel uImage of an i.MX6q based embedded device, it seems that QEMU crashes with "Unable to handle kernel NULL pointer dereference at virtual address 00000044". Before crashing ...
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12 views

Allow Guest Users to Edit Network, While Denying Access to Other Folders

I've deployed an in-house web service application onto an airgapped hypervisor hosting a RHEL server guest. The guest RHEL has undergone basic OS hardening. All interactions are web-based, so under ...
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1answer
152 views

Use /30 netmask in Debian with bridged adapter in VirtualBox

I have Debian 9.6 installed in VirtualBox with bridged adapter. My question is, how to config my interfaces to have /30 netmask? I tried a lot a different things but I can't connect my host to the VM ...
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1answer
268 views

Linux fails to boot on VirtualBox with 2 CPUs

I made a Linux Ubuntu 16.04 VDI image on VirtualBox on an Intel i7 machine (4 CPUs), with a set of tools inside. Then I copied that VDI to an old machine (Core 2 duo - 2 CPUs), I created the VM using ...
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1answer
40 views

Error creating VM using VBoxManage

I'm followng Oracles instructions on how to create and manage a vm through VB's CLI. when I run VBoxManage createvm --name Debian_64 --ostype Debian_64 --register I get the following error ...
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170 views

How to manage users and passwords in LXC containers?

Example Container created (no matter if Ubuntu or Debian, the problem is the same) and running. New non-privileged user created inside the container (# useradd -m newUser -p newPass108). It is ...