systemd-detect-virt man page

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, with whatever software, except
           Oracle Virtualbox
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
xen Xen hypervisor (only domU, not dom0)
bochs Bochs Emulator
uml User-mode Linux
parallels Parallels Desktop, Parallels Server
bhyve bhyve, FreeBSD hypervisor
Container openvz OpenVZ/Virtuozzo
lxc Linux container implementation by LXC
lxc-libvirt Linux container implementation by libvirt
systemd-nspawn systemd's minimal container implementation, see systemd-nspawn(1)
docker Docker container manager
rkt rkt app container runtime

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).

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.

-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)

Referenced By

systemd.directives(7), systemd.index(7), systemd.unit(5).

systemd 233 systemd-detect-virt