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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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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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2answers
29 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
46 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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16 views

VM Management & Failover [on hold]

I would like to set up a small server, for a small company, on which would live several virtual machines including: -A Windows test environment for support technicians -centralized logging server(s) ...
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1answer
19 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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Is there any difference in performance when creating VM using default template vs custom snapshot in DO/AWS lightsail? [closed]

AWS Is there any difference in performance, when we creating instance in AWS Lightsail using your blueprints vs using custom snapshot? Example: AWS Using AWS Blueprint $result = $client->...
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0answers
22 views

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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23 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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vcenter server 6.5 and 6.7 both failing [ERROR]: Failed to connect, Unknown host localhost [closed]

I have been trying from yesterday to get vCSA up and running tried, I have followed multiple youtube videos, and got the AD DNS set up complete and made the vCSA work, however, I can't access the vCSA ...
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1answer
52 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
43 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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Does Docker's virtualization belong to the kind of virtualization by virtual appliance?

From Modern Operating Systems 7.8 VIRTUAL APPLIANCES Virtual machines offer an interesting solution to a problem that has long plagued users, especially users of open source ...
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2answers
48 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
19 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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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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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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16 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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21 views

How to set up several virtual networks - sharing eth0 connection, or only-local, or both? — for VM/Container

I wish to generate a number of virtual Ethernet ports to be used for containers and VMs, for the three following scenarios: Sharing the existing eth0 which has previously been assigned an IP address ...
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1answer
34 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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1answer
80 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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0answers
18 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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0answers
19 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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0answers
21 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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0answers
19 views

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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0answers
28 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
22 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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0answers
66 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
47 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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0answers
36 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
65 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
56 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
93 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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94 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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0answers
54 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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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
59 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
66 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
31 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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0answers
58 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 ...
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1answer
72 views

QEMU - Ubuntu Guest on Ubuntu Host - Install works, reboot doesn't

I have successfully installed QEMU to do VGA passthrough. I can get the guest to read the Ubuntu ISO and it will find the img drive I have allocated with fallocate -l 100G /VMs/VMs/video_gpu.img ...
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1answer
46 views

How to convert root filesystem to virtual disk format (img, vmdk or vdi)?

I unpacked the contents of a Mageia 6 ISO image, including a Linux root file system in it, and I've updated the root file system by chrooting into it and running dnf update. I also installed a few ...
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0answers
40 views

Do not access linux host to windows kvm guest [closed]

I installed manjaro linux.Now in manjaro i want run windows 10 guest so in order by using QEMU/KVM and according this site i installed windows 10 on my linux. My linux host ip is: 2:enp5s0: <...
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1answer
150 views

High cpu steal on Core 0 of KVM

In one of my KVM setups I am seeing high CPU stealing for Core 0 of both the guests. I have gone through saveral web results related to cpu steal but no were core steal is explained. If I take ...
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2answers
48 views

When using cloud-init, what order are the users created in?

I am using cloud-init to initialize a RHEL Atomic Host VM. I have the following as my user-data file: #cloud-config groups: - ourgroup users: - name: muser primary_group: ourgroup ...
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1answer
54 views

Will starting a virtual machine created by virtualbox immediately reserve physical RAM assigned to it?

When creating a virtual machine and then installing Android or Windows or other OS on top of it, if I assign 4GB to the virtual machine, will starting the virtual machine immediately reserve 4GB ...
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0answers
75 views

QEMU: How to set up SSH File Exchange (SFTP) between Linux Host and Windows Guest?

Assumed I run a isolated virtual network bridge without public internet access (based on this solution): How can I set up a SFTP file exchange (e.g. via WinSCP) between guest machine and host machine ...
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2answers
240 views

apk tool gives permission denied

I get this error message running alpine linux in a docker container hosted by Ubuntu 18.04 in Vagrant with its host in turn being Windows 10 behind a proxy. I have set the proxy variables but still ...
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0answers
92 views

Unable to boot a compiled kernel [closed]

I am working on a project where I have start of by adding some system calls to a kernel (Linux 3.13.11 to be particular), after adding the calls and writing their prototype in the correct locations ...
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1answer
35 views

why hostnamectl shows virtualization regardless no guest additions installed?

I'm running a very basic debian 9 OS inside Virtualbox, I haven't installed any paravirtualization | guest additions, regardless that I get Virtualization: oracle. Why? isn't it supposed the OS should ...
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2answers
68 views

Virtual machine software [closed]

I am looking for a recommendation for virtualization software for IBM P5 series (ppc 64). I have Fedora 23 installed and just want to run 2-3 virtual machines but as I understood, given specific ...