Unix and Linux Stack Exchange
Unix and Linux Stack Exchange

Questions tagged [virtualization]

Virtualization is the process of using software to create a virtual resource of something; usually, it refers to hardware virtualization, the act of running an operating system (referred to as guest) inside an host system.

Commonly-used software for virtualization on the desktop:

For server applications are often used:

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Does LVM impact performance?

I have to migrate a few servers to Linux, and one important aspect that I need to evaluate is that my new host system must have elastic storage capacity. Naturally, doing some basic research, I came across LVM. Is there any performance penalty for…
Pablo
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Linux LXC vs FreeBSD jail

Are there any notable differences between LXC (Linux containers) and FreeBSD's jails in terms of security, stability & performance? On first look, both approaches look very similar.
Philipp Claßen
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Should LVM partitions be used in virtual machine images?

Should LVM be used for the partitions when creating VM images (e.g., KVM images)? It seems like it adds complexity if you want to, say, mount a qcow2 image in the host if the image has LVM partitions. On the other hand, it doesn't seem like the…
Lorin Hochstein
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"echo 3 > /proc/sys/vm/drop_caches" - Permission denied as root

I am currently having some issues with the cache. It is a little too much right now so I wanted to clear it. I googled and found this little command: sync && echo 3 > /proc/sys/vm/drop_caches. I am logged in as root over SSH (not using sudo). These…
BrainStone
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Emulate unplugging a network cable with qemu-kvm

[Background: I'd like to actually test How to take down a static network interface when not connected? ] I'm setting up a QEMU-KVM virtual machine using libvirt (via virt-manager). I put two NICs on it (both virtio). They are bridged to a physical…
derobert
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How to improve Windows perfomance when running inside KVM

I use Ubuntu 12.04 64-bit and KVM, my CPU is Core i5 3.3 GHz and I have 8 GB of DDR3 RAM. I run Windows 7 in KVM and it's extremely slow. My co-worker use Debian on the same PC configuration and can run Windows 7 extremely fast! Where can be my…
Guy Fawkes
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Do VirtualBox or VMWare use the Intel VT-d feature?

I'm thinking about a new laptop, which has Intel VT support, but recently I discovered a feature other than Intel® Virtualization Technology (VT-x), which is Intel® Virtualization Technology for Directed I/O (VT-d). Is VirtualBox or VMware taking…
daisy
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How to check which hypervisor is used from my VM?

So I'm running a VM somewhere and want to know what hypervisor the host is running. Any way to check whether it's running KVM or in a container? The vm is running Ubuntu
Sam Stoelinga
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How to create user cgroups with systemd

I use unprivileged lxc containers in Arch Linux. Here are the basic system infos: [chb@conventiont ~]$ uname -a Linux conventiont 3.17.4-Chb #1 SMP PREEMPT Fri Nov 28 12:39:54 UTC 2014 x86_64 GNU/Linux It's a custom/compiled kernel with user…
lord.garbage
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setup kvm on a wireless interface on a laptop machine

I am trying to setup KVM in ubuntu 14.04 host machine. I use a wireless interface to access the internet in my machine. I have setup the wireless interface in my /etc/networks/interfaces as below. auto wlan0 iface wlan0 inet static address…
Ramesh
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How to find VM OS installation media file in the Proxmox Web Interface?

I have installed Proxmox and wanted to create a VM by using the Proxmox web interface GUI (now the version is 2.0-38/af81df02) However I have problem to find my Guest VM OS installation CD/DVD ISO file in the web GUI interface. There is no ISO…
Xianlin
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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 being free to operate the base operating system…
Paul
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Fast X for LXC guest on localhost?

How can I run X apps inside an LXC container efficiently? ssh -Y guest is too slow - there is no graphics acceleration with ssh -Y - everything has to travel over the virtual network with the traditional X11 protocol. Being able to copy-paste…
Robin Green
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Tools for Monitoring Steal Time (st)

We're running on a virtual "dedicated" server, which should, in theory, mean that we're the only guys on the server. In practice.... I'm thinking we might not be. Notice that although it looks like we're killing our machine, "Steal time" is at…
mgjk
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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 and running fine. However, they cannot ping each…
Jay Lepore
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