Man1 - systemd-detect-virt.1

Table of Contents

NAME

systemd-detect-virt - Detect execution in a virtualized environment

SYNOPSIS

systemd-detect-virt [OPTIONS…]

DESCRIPTION

systemd-detect-virt detects execution in a virtualized environment. It identifies the virtualization technology and can distinguish full machine virtualization from container virtualization. systemd-detect-virt exits with a return value of 0 (success) if a virtualization technology is detected, and non-zero (error) otherwise. By default, any type of virtualization is detected, and the options –container and –vm can be used to limit what types of virtualization are detected.

When executed without –quiet will print a short identifier for the detected virtualization technology. The following technologies are currently identified:


Table 1. Known virtualization technologies (both VM, i.e. full hardware virtualization, and container, i.e. shared kernel virtualization)

Type ID Product
VM qemu QEMU software virtualization, without KVM
  kvm Linux KVM kernel virtual machine, in combination with QEMU. Not used for other virtualizers using the KVM interfaces, such as Oracle VirtualBox or Amazon EC2 Nitro, see below.
  amazon Amazon EC2 Nitro using Linux KVM
  zvm s390 z/VM
  vmware VMware Workstation or Server, and related products
  microsoft Hyper-V, also known as Viridian or Windows Server Virtualization
  oracle Oracle VM VirtualBox (historically marketed by innotek and Sun Microsystems), for legacy and KVM hypervisor
  powervm IBM PowerVM hypervisor — comes as firmware with some IBM POWER servers
  xen Xen hypervisor (only domU, not dom0)
  bochs Bochs Emulator
  uml User-mode Linux
  parallels Parallels Desktop, Parallels Server
  bhyve bhyve, FreeBSD hypervisor
  qnx QNX hypervisor
acrn ACRN hypervisor[1]  
Container openvz OpenVZ/Virtuozzo
  lxc Linux container implementation by LXC
  lxc-libvirt Linux container implementation by libvirt
  systemd-nspawn systemds minimal container implementation, see *systemd-nspawn*(1)
  docker Docker container manager
  podman Podman[2] container manager
  rkt rkt app container runtime
  wsl Windows Subsystem for Linux[3]
  proot proot[4] userspace chroot/bind mount emulation
  pouch Pouch[5] Container Engine

If multiple virtualization solutions are used, only the “innermost” is detected and identified. That means if both machine and container virtualization are used in conjunction, only the latter will be identified (unless –vm is passed).

Windows Subsystem for Linux is not a Linux container, but an environment for running Linux userspace applications on top of the Windows kernel using a Linux-compatible interface. WSL is categorized as a container for practical purposes. Multiple WSL environments share the same kernel and services should generally behave like when being run in a container.

OPTIONS

The following options are understood:

-c, –container

Only detects container virtualization (i.e. shared kernel virtualization).

-v, –vm

Only detects hardware virtualization.

-r, –chroot

Detect whether invoked in a chroot*(2) environment. In this mode, no output is written, but the return value indicates whether the process was invoked in a *chroot() environment or not.

–private-users

Detect whether invoked in a user namespace. In this mode, no output is written, but the return value indicates whether the process was invoked inside of a user namespace or not. See *user_namespaces*(7) for more information.

-q, –quiet

Suppress output of the virtualization technology identifier.

–list

Output all currently known and detectable container and VM environments.

-h, –help

Print a short help text and exit.

–version

Print a short version string and exit.

EXIT STATUS

If a virtualization technology is detected, 0 is returned, a non-zero code otherwise.

SEE ALSO

*systemd*(1), *systemd-nspawn*(1), *chroot*(2), *namespaces*(7)

NOTES

Author: dt

Created: 2022-02-22 Tue 17:26