systemd-detect-virt(1) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXIT STATUS | SEE ALSO | NOTES | COLOPHON

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

NAME         top

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

SYNOPSIS         top

       systemd-detect-virt [OPTIONS...]

DESCRIPTION         top

       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      │
       │          ├────────────────────┼─────────────────────┤
       │          │ acrnACRN 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             │
       │          ├────────────────────┼─────────────────────┤
       │          │ podmanPodman[2] container │
       │          │                    │ manager             │
       │          ├────────────────────┼─────────────────────┤
       │          │ rkt                │ rkt app container   │
       │          │                    │ runtime             │
       │          ├────────────────────┼─────────────────────┤
       │          │ wslWindows Subsystem   │
       │          │                    │ for Linux[3]        │
       ├──────────┼────────────────────┼─────────────────────┤
       │prootproot[4] userspace │                     │
       │          │ chroot/bind mount  │                     │
       │          │ emulation          │                     │
       └──────────┴────────────────────┴─────────────────────┘

       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         top

       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         top

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

SEE ALSO         top

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

NOTES         top

        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

        4. proot
           https://proot-me.github.io/

COLOPHON         top

       This page is part of the systemd (systemd system and service manager)
       project.  Information about the project can be found at 
       ⟨http://www.freedesktop.org/wiki/Software/systemd⟩.  If you have a bug
       report for this manual page, see
       ⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.  This
       page was obtained from the project's upstream Git repository
       ⟨https://github.com/systemd/systemd.git⟩ on 2020-06-09.  (At that
       time, the date of the most recent commit that was found in the repos‐
       itory was 2020-06-09.)  If you discover any rendering problems in
       this HTML version of the page, or you believe there is a better or
       more up-to-date source for the page, or you have corrections or
       improvements to the information in this COLOPHON (which is not part
       of the original manual page), send a mail to man-pages@man7.org

systemd 245                                           SYSTEMD-DETECT-VIRT(1)

Pages that refer to this page: org.freedesktop.systemd1(5)systemd.unit(5)30-systemd-environment-d-generator(7)systemd.directives(7)systemd.index(7)udev(7)