320 lines
7.1 KiB
HTML
320 lines
7.1 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of SYSTEMD-DETECT-VIRT</TITLE>
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</HEAD><BODY>
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<H1>SYSTEMD-DETECT-VIRT</H1>
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Section: systemd-detect-virt (1)<BR>Updated: <BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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systemd-detect-virt - Detect execution in a virtualized environment
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<DL COMPACT>
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<DT id="1">
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<B>systemd-detect-virt</B> [OPTIONS...]
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</DL>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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<P>
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<B>systemd-detect-virt</B>
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<DD>detects execution in a virtualized environment. It identifies the virtualization technology and can distinguish full machine virtualization from container virtualization.
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systemd-detect-virt
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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
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<B>--container</B>
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and
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<B>--vm</B>
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can be used to limit what types of virtualization are detected.
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<P>
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When executed without
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<B>--quiet</B>
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will print a short identifier for the detected virtualization technology. The following technologies are currently identified:
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<P>
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<BR>
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<B>Table 1. Known virtualization technologies (both VM, i.e. full hardware virtualization, and container, i.e. shared kernel virtualization)</B>
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<TABLE BORDER>
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<TR VALIGN=top><TD><B>
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Type
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</B></TD><TD><B>
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ID
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</B></TD><TD><B>
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Product
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</B><BR></TD></TR>
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<TR VALIGN=top><TD ROWSPAN=2>
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VM
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</TD><TD>
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<I>qemu</I>
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</TD><TD>
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QEMU software virtualization, without KVM
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<BR></TD></TR>
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<TR VALIGN=top><TD>
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<I>kvm</I>
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</TD><TD>
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Linux KVM kernel virtual machine, with whatever software, except Oracle Virtualbox
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</TD></TR>
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<TR VALIGN=top><TD>
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<I>zvm</I>
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</TD><TD>
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s390 z/VM
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</TD></TR>
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<TR VALIGN=top><TD>
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<I>vmware</I>
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</TD><TD>
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VMware Workstation or Server, and related products
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</TD></TR>
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<TR VALIGN=top><TD>
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<I>microsoft</I>
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</TD><TD>
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Hyper-V, also known as Viridian or Windows Server Virtualization
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</TD></TR>
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<TR VALIGN=top><TD>
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<I>oracle</I>
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</TD><TD>
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Oracle VM VirtualBox (historically marketed by innotek and Sun Microsystems), for legacy and KVM hypervisor
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</TD></TR>
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<TR VALIGN=top><TD>
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<I>xen</I>
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</TD><TD>
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Xen hypervisor (only domU, not dom0)
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</TD></TR>
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<TR VALIGN=top><TD>
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<I>bochs</I>
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</TD><TD>
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Bochs Emulator
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</TD></TR>
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<TR VALIGN=top><TD>
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<I>uml</I>
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</TD><TD>
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User-mode Linux
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</TD></TR>
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<TR VALIGN=top><TD>
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<I>parallels</I>
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</TD><TD>
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Parallels Desktop, Parallels Server
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</TD></TR>
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<TR VALIGN=top><TD>
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<I>bhyve</I>
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</TD><TD>
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bhyve, FreeBSD hypervisor
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</TD></TR>
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<TR VALIGN=top><TD>
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<I>qnx</I>
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</TD><TD>
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QNX hypervisor
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</TD></TR>
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<TR VALIGN=top><TD>
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<I>acrn</I>
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</TD><TD>
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m[blue]<B>ACRN hypervisor</B>m[]<FONT SIZE="-2">[1]</FONT>
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</TD></TR>
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<TR VALIGN=top><TD ROWSPAN=2>
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Container
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</TD><TD>
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<I>openvz</I>
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</TD><TD>
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OpenVZ/Virtuozzo
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<BR></TD></TR>
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<TR VALIGN=top><TD>
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<I>lxc</I>
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</TD><TD>
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Linux container implementation by LXC
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</TD></TR>
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<TR VALIGN=top><TD>
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<I>lxc-libvirt</I>
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</TD><TD>
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Linux container implementation by libvirt
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</TD></TR>
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<TR VALIGN=top><TD>
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<I>systemd-nspawn</I>
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</TD><TD>
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systemd's minimal container implementation, see <B><A HREF="/cgi-bin/man/man2html?1+systemd-nspawn">systemd-nspawn</A></B>(1)
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</TD></TR>
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<TR VALIGN=top><TD>
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<I>docker</I>
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</TD><TD>
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Docker container manager
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</TD></TR>
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<TR VALIGN=top><TD>
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<I>podman</I>
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</TD><TD>
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m[blue]<B>Podman</B>m[]<FONT SIZE="-2">[2]</FONT> container manager
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</TD></TR>
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<TR VALIGN=top><TD>
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<I>rkt</I>
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</TD><TD>
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rkt app container runtime
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</TD></TR>
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<TR VALIGN=top><TD>
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<I>wsl</I>
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</TD><TD>
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m[blue]<B>Windows Subsystem for Linux</B>m[]<FONT SIZE="-2">[3]</FONT>
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</TD></TR>
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</TABLE>
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<P>
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<P>
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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
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<B>--vm</B>
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is passed).
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<P>
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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.
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<A NAME="lbAE"> </A>
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<H2>OPTIONS</H2>
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<P>
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The following options are understood:
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<P>
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<B>-c</B>, <B>--container</B>
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<DL COMPACT><DT id="2"><DD>
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Only detects container virtualization (i.e. shared kernel virtualization).
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</DL>
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<P>
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<B>-v</B>, <B>--vm</B>
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<DL COMPACT><DT id="3"><DD>
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Only detects hardware virtualization.
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</DL>
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<P>
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<B>-r</B>, <B>--chroot</B>
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<DL COMPACT><DT id="4"><DD>
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Detect whether invoked in a
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<B><A HREF="/cgi-bin/man/man2html?2+chroot">chroot</A></B>(2)
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environment. In this mode, no output is written, but the return value indicates whether the process was invoked in a
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<B>chroot()</B>
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environment or not.
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</DL>
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<P>
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<B>--private-users</B>
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<DL COMPACT><DT id="5"><DD>
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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
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<B><A HREF="/cgi-bin/man/man2html?7+user_namespaces">user_namespaces</A></B>(7)
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for more information.
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</DL>
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<P>
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<B>-q</B>, <B>--quiet</B>
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<DL COMPACT><DT id="6"><DD>
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Suppress output of the virtualization technology identifier.
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</DL>
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<P>
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<B>--list</B>
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<DL COMPACT><DT id="7"><DD>
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Output all currently known and detectable container and VM environments.
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</DL>
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<P>
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<B>-h</B>, <B>--help</B>
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<DL COMPACT><DT id="8"><DD>
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Print a short help text and exit.
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</DL>
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<P>
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<B>--version</B>
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<DL COMPACT><DT id="9"><DD>
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Print a short version string and exit.
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</DL>
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<A NAME="lbAF"> </A>
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<H2>EXIT STATUS</H2>
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<P>
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If a virtualization technology is detected, 0 is returned, a non-zero code otherwise.
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<A NAME="lbAG"> </A>
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<H2>SEE ALSO</H2>
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<P>
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<B><A HREF="/cgi-bin/man/man2html?1+systemd">systemd</A></B>(1),
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<B><A HREF="/cgi-bin/man/man2html?1+systemd-nspawn">systemd-nspawn</A></B>(1),
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<B><A HREF="/cgi-bin/man/man2html?2+chroot">chroot</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?7+namespaces">namespaces</A></B>(7)
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<A NAME="lbAH"> </A>
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<H2>NOTES</H2>
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<DL COMPACT>
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<DT id="10"> 1.<DD>
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ACRN hypervisor
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<DL COMPACT><DT id="11"><DD>
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<A HREF="https://projectacrn.org">https://projectacrn.org</A>
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</DL>
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<DT id="12"> 2.<DD>
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Podman
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<DL COMPACT><DT id="13"><DD>
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<A HREF="https://podman.io">https://podman.io</A>
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</DL>
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<DT id="14"> 3.<DD>
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Windows Subsystem for Linux
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<DL COMPACT><DT id="15"><DD>
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<A HREF="https://docs.microsoft.com/en-us/windows/wsl/about">https://docs.microsoft.com/en-us/windows/wsl/about</A>
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</DL>
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<P>
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</DL>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="16"><A HREF="#lbAB">NAME</A><DD>
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<DT id="17"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="18"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="19"><A HREF="#lbAE">OPTIONS</A><DD>
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<DT id="20"><A HREF="#lbAF">EXIT STATUS</A><DD>
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<DT id="21"><A HREF="#lbAG">SEE ALSO</A><DD>
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<DT id="22"><A HREF="#lbAH">NOTES</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:28 GMT, March 31, 2021
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</BODY>
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</HTML>
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