systemd-detect-virt

SYSTEMD-DETECT-VIRT(1)        systemd-detect-virt       SYSTEMD-DETECT-VIRT(1)

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,    |
       |          |                | 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          |
       |          +----------------+---------------------+
       |          | 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 | systemd's 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]        |
       +----------+----------------+---------------------+

       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
        1. ACRN hypervisor
           https://projectacrn.org

        2. Podman
           https://podman.io

        3. Windows Subsystem for Linux
           https://docs.microsoft.com/en-us/windows/wsl/about

systemd 245                                             SYSTEMD-DETECT-VIRT(1)