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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Linux / JVM - OutOfMemoryError: unable to create new native thread

I have a memory problem with a Linux server (CentOS). It is a VM. Below is the context. It has 70Gb of RAM. There are 2 tomcat running on it. One tomcat is given a heap of 13Gb and the other one a ...
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0answers
5 views

Gnome-boxes not able to see virtual machines after sleep

I am having a bit of trouble to solve this issue. I am using gnome-boxes to run my windows boxes for my school project purpose. When I boot the system, everything works just fine When I type : ...
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2answers
80 views

How to install/run some non-free programs isolated from rest? [on hold]

This is for desktop linux. I want to use the below software but run it in an isolated environment as I don't fully trust them. dropbox chrome firefox with flash player hal-flash to watch drm ...
3
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1answer
516 views

Can't boot properly after moving all files off then back on my VM drive

I have created an Ubuntu 12.04 32-bit VM in VirtualBox with a .vdi disk. I then mount this disk with qemu-nbd and move all the files off it; then back onto it. When I boot the VM again I get varying ...
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2answers
15 views

Send network traffic via a Windows VM on the same host to use corporate vpn?

At work we have a VPN solution that will only work on windows. I personally do not run Windows at home and run Linux (Ubuntu 14.04). I used Virtual Box to setup a Windows 7 virtual machine to run ...
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0answers
23 views

how do I mount an external hard drive connected via SATA Wire to CentOS 7

I have CentOS 7 installed as a guest OS inside VirtualBox running on a Windows 8.1 machine. There is a SATA Wire connecting the machine to an external hard drive that used to contain a dual boot ...
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1answer
24 views

enabling vnc after using virt-install

I've created a virtual machine using virt-install with graphics --none. I want to enable vnc. I've tried virsh -c qemu:///system qemu-monitor-command vm171-SC-1 --hmp change vnc :3 but it doesn't ...
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0answers
16 views

No sound coming from Linux-based virtual machines under Qemu on Linux Mint 16 host - why?

I have been using Qemu and virt-manager for quite some time (years) now and it's only recently that I noticed I don't get any sound output from any of my Linux-based virtual machines — it's always ...
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2answers
8k views

Installing Android-x86 on a USB (not creating a Live USB)?

I want to carry around an Android OS install on a USB so I can have a Google Authenticator with me everywhere I go since I don't own any mobile devices. The idea being that I can run Android through ...
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1answer
1k views

How to migrate from Proxmox to VMWare?

I am wondering how it is possible to migrate a full hardware VM in Proxmox (qemu) to a full hardware VM in VMWare (vmdk). I have been searching all over the place, and it seems almost impossible to ...
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1answer
66 views

VirtualBox guest cannot connect to USB drive, why not?

I have VirtualBox installed in Windows 8.1 and I am using it to launch and use CentOS 7 within VirtualBox. When I connect a USB drive to the computer, and right click over the icon circled in the ...
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1answer
1k views

Problem runing vmPlayer on fedora 21

First of all: Hello :) And then: After install the program and execute vmPlayer request the kernel headers to recompile it (I guess), after that vmP install the virtual network device, at this point ...
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1answer
22 views

Disk mount on a linux VM , mounted elsewhere

Hi I am using a slightly unnecessary(maybe?) kind of a set up ... A debian build_VM The build_VM ran out of space so I formatted and mounted a disk on to the build_VM But before mounting the ...
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1answer
649 views

docker - how to run x desktop in a container?

I'm trying to set up my Linux machine to run multiple guest OSes, one of those being a Windows VM, and another a Linux container. The goal here is to prevent me from messing up the host system, while ...
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1answer
1k views

One host, two virtual machines that cannot ping each other. How to solve

We have Virtual Machines operating within the KVM environment. We setup one as a dev server running Apache etc., and the other as a Windows development environment. The two environments are setup ...
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0answers
8 views

.xml OR .img file copy from server to client and boot OS on server using client's hardware

I'm using virtual manager in rhel6. made two virtual machines . one server and other client(both running rhel6 OS) I want to copy .xml file from server's /etc/libvirt/qemu to client's system to use ...
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3answers
640 views

NFS server on qemu guest

I need to know how I can mount block devices, placed on a qemu guest system, from host. So in this case we have NFS server placed on guest system and NFS client on the host's side. There are a lot ...
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1answer
42 views

Setup a classroom Linux system

I need to set up a 30-user Ubuntu classroom. All our PCs are currently Microsoft Windows based and run from Windows servers. In the school I need my students to have full access to Ubuntu OS, so that ...
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1answer
33 views

What are the differences between virtualbox-linux and installed-linux? [closed]

Is using virtualbox for running linux any different than installing linux on the machine except for performance ? Are there any drawbacks from using virtual box to run linux than trying the real thing ...
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0answers
39 views

Export virtualbox image files from a linux box

We have a Linux box that we used to have support for. but the company that supports the box went out of business. The server (I believe is Ubuntu) was backing up our physical servers and creates an ...
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1answer
36 views

Why does this bash fork bomb not work on my RHEL VM?

I'm running a RHEL 6.5 VM in a VMware ESXi environment and accessing it through the vSphere Web Client virtual console (in my browser). I wanted to crash this machine on purpose and executed :(){ ...
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3answers
555 views

running qemu on Fedora20

With Fedora20 and built from sources qemu-2.1.1, I'm experiencing issues to run qemu with non-root privileges: % qemu-system-x86_64 -hda vdisk.img -m 512M -netdev ...
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0answers
20 views

How to configure Ubuntu 12.04 VM to use physical serial port on host

I am trying to configure a Ubuntu 12.04 VM to use a physical serial port on the host. When configuring the serial port in vSphere, I am presented with two options – uart0 and uart1. From what I can ...
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0answers
22 views

Can I inherit iptable rules on/under windows? [migrated]

Don't really want to purchase a VPS just to test some iptables stuff for my gameserver. Was curious if it's possible to load up debian on vmware player and install nginx, nodejs, mysql, etc (which is ...
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3answers
2k views

Having issues installing Kali Linux in Virtualbox

Trying to install Kali Linux in VB and it freezes. I believe I have the correct version and a good ISO because it comes up and allows me to navigate to "install" Once I press enter, all that happens ...
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1answer
68 views

How to configure a workstation for multiple Linux and Windows users?

I work at a university and a part of my job entails usage of software for numerical simulation of fluid flow. My department decided to buy a new high- end workstation that should primarily serve as ...
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1answer
853 views

Any better alternative to chroot on an OpenVZ VPS?

Are there any better alternative to chroot environment? I'm thinking about running nginx on a jailed environment. BTW, I'm on OpenVZ VPS, so modifying the Kernel is a no-no. (I think that prevents ...
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1answer
62 views

How to send/upload a file from Host OS to guest OS in KVM?(not folder sharing)

I have to make a configuration file available to guest OS running on top of KVM hyper-visor. I have already read about folder sharing options between host and guest in KVM with 'qemu' and 9P virtio ...
0
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1answer
999 views

kvm virtual manager connection failed

I installed kvm package in the centos7 i am getting this problem how to solve this. full error is here Unable to connect to libvirt. no connection driver available for qemu:///system Libvirt URI ...
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2answers
181 views

Installing VBox Guest Additions when there is no X-server

I'm using Virtual Box on my windows 8.1 host machine. I have installed CentOS & Ubuntu in 'Graphical Mode' and had sufficient practice. But now I wanted to switch to 'Command Line Mode" ...
0
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1answer
20 views

Enable virtualization with gigabyte ud3 990fx

I'm trying to get the virtualization running : I have the following settings: Mainboard: gigabyte ud3 990fx CPU: fx-9590 Kernel: 3.11.0-12-generic Linux Mint 17 In the bios both svm as well as ...
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1answer
28 views

LinuxMint “File System” shows no space when many GB exist

I have a VM running LinuxMint 17.1. I just resized the virtual disk, then used a live CD to resize the system partitions. I now have 18GB+ free. However, when I look in Files, "File System" shows as ...
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0answers
36 views

Moving a whole server into docker instance (or LXC)

It seems to work, to move an existing install into a virtual machine. Is it possible to move a whole Debian server into a docker instance inside the same machine? I would like to get a docker that I ...
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0answers
50 views

GParted LiveCD fails to start

I have a VM setup in VirtualBox (LinuxMint 17.1). But I'm trying to boot to GParted so I can resize a partition. I'm using gparted-live-0.22.0-2-amd64.iso and it boots correctly. I've tried every ...
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0answers
599 views

Distributed video encoding with ffmpeg [closed]

I'm in a process of giving form to a very old dream of mine - to create an efficient and cheap video encoding platform. And following the great examples such as SETI@home, BitTorrent and BitCoin, ...
0
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1answer
29 views

Is it possible to install RHEV on el6 clustered computer

Is it possible to use Linux (el6) clustered computer can be used as a hypervisor for RHEV 3.3/Ovirt 3.3? Cause, we can not combine RAM/CPU from two or more hypervisores to be considered as a one ...
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0answers
17 views

extract information about vmware host from within the guest

I have virtual machine (guest) running inside VMware Hypervisor (host). The guest is running Debian and has vmware tools installed How can I extract as much information as possible about the host, ...
1
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1answer
145 views

No cursor/caret in Linux VMC under Windows Hyper-V?

I have just installed CentOS-7, Minimal Installation, into a Hyper-V VM under Windows Server 2008 R2. When I Start the VM from Hyper-V Manager it opens a window it calls Virtual Machine Connection, ...
0
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1answer
62 views

How to mount VMware-tools cdrom inside a VM

I know this should be easy, but I'm having a hell of a time figuring out where the vmware tools cdrom is (for instance it's not /dev/cdrom) and so I can't figure out how to mount it. I'm on Kali ...
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2answers
821 views

Linux guest VM on mac host - Keyboard

I use a Mac as a development box, but am slowly transitioning to Linux. So I am spending the majority of my time in the Linux guest VM while working. But I still spend a fair amount of time in Mac ...
2
votes
2answers
1k views

Installing Ubuntu-13.0 Desktop in Qemu

Following are the details of my system: Fedora Core-18, i686. I am trying to install ubuntu in the qemu. Following are the commands I executed: qemu-img create ubuntu.img 8G qemu-system-i386 -hda ...
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vote
1answer
25 views

How do I keep the time on a server (virtual machine) updated over time?

I have a virtual machine running headless in my machine. When I start it for the first time, the result of date command is correct. But after about a day or 2, I SSH into it and the date command has ...
1
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1answer
53 views

USB not working : USB Ports Hijacked/Reserved Permanently by VirtualBox

This scary incident happened today morning. I started a virtual machine inside my Linux Mint host and shared my USB Wireless device with the machine. The virtual machine's image resided in an ...
0
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2answers
555 views

Nested virtualization: run RHEVH inside KVM

I have laptop with 16GB RAM, trying to install Red Hat Enterprise Virtualization Hypervizor 3.3 on Virtual Machine Manager (KVM) based Guest, but it gives error "Virtualization Hardware not found" ? ...
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0answers
30 views

VirtualBox wont do seamless mode

I had a wheezy debian virtual machine, and I updated to jessie. Now, the VM will not do seamless mode, or even full screen. I tried updating VirtualBox, installing Guest Additions, installing the PEUL ...
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4answers
2k views

Share memory between a virtual machine and the host

Through shmget and shmat, I am able to access the data stored in one program from another program. Here's the gist of the code: key=ftok("shared.c",'c'); shmid=shmget(key,1024,0644|IPC_CREAT); ...
0
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1answer
25 views

Why does user mode linux spawn 4 processes?

If I start User Mode Linux with this command: ./kernel32-3.19.8 ubda=./Debian-Wheezy-x86-root_fs mem=128m On Debian GNU/Linux 8 (jessie) with one CPU core, why do I see 4 processes in top: 1608 ...
2
votes
2answers
164 views

Linux-KVM, QEMU, Virtualbox, VMWare [closed]

I'm new to Linux. I'm trying to build Chromium OS and run it on QEMU. Meanwhile I came across Linux KVM, Virtualbox and VMWare. So I have basically two questions about virtualization in Linux: What ...
0
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1answer
39 views

VM Machine rebooted, cant find how?

One of my VM machine was rebooted yesterday, but cant find how & who did it. In the log I can only find "receiving single 15, terminated" please help how to do further troubleshooting.
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1answer
41 views

How to start Virtual Box service on Linux

I performed a dist-upgrade and then and autoclean and autoremove. It disabled the Virtual Box service on Linux because the headers were out of date. The headers caught up, so I rebuilt the modules off ...