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]         │
       ├──────────┼────────────────────┼──────────────────────┤
       │proot     proot[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
       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

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



systemd 246                                               SYSTEMD-DETECT-VIRT(1)