mirror of
https://github.com/systemd/systemd.git
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246 lines
7.9 KiB
XML
246 lines
7.9 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="systemd-detect-virt"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>systemd-detect-virt</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-detect-virt</refentrytitle>
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<manvolnum>1</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-detect-virt</refname>
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<refpurpose>Detect execution in a virtualized environment</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>systemd-detect-virt <arg choice="opt" rep="repeat">OPTIONS</arg></command>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><command>systemd-detect-virt</command> detects execution in
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a virtualized environment. It identifies the virtualization
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technology and can distinguish full machine virtualization from
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container virtualization. <filename>systemd-detect-virt</filename>
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exits with a return value of 0 (success) if a virtualization
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technology is detected, and non-zero (error) otherwise. By default,
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any type of virtualization is detected, and the options
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<option>--container</option> and <option>--vm</option> can be used
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to limit what types of virtualization are detected.</para>
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<para>When executed without <option>--quiet</option> will print a
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short identifier for the detected virtualization technology. The
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following technologies are currently identified:</para>
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<table>
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<title>Known virtualization technologies (both
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VM, i.e. full hardware virtualization,
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and container, i.e. shared kernel virtualization)</title>
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<tgroup cols='3' align='left' colsep='1' rowsep='1'>
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<colspec colname="type" />
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<colspec colname="id" />
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<colspec colname="product" />
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<thead>
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<row>
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<entry>Type</entry>
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<entry>ID</entry>
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<entry>Product</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry valign="top" morerows="9">VM</entry>
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<entry><varname>qemu</varname></entry>
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<entry>QEMU software virtualization</entry>
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</row>
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<row>
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<entry><varname>kvm</varname></entry>
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<entry>Linux KVM kernel virtual machine</entry>
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</row>
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<row>
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<entry><varname>zvm</varname></entry>
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<entry>s390 z/VM</entry>
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</row>
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<row>
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<entry><varname>vmware</varname></entry>
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<entry>VMware Workstation or Server, and related products</entry>
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</row>
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<row>
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<entry><varname>microsoft</varname></entry>
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<entry>Hyper-V, also known as Viridian or Windows Server Virtualization</entry>
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</row>
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<row>
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<entry><varname>oracle</varname></entry>
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<entry>Oracle VM VirtualBox (historically marketed by innotek and Sun Microsystems)</entry>
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</row>
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<row>
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<entry><varname>xen</varname></entry>
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<entry>Xen hypervisor (only domU, not dom0)</entry>
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</row>
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<row>
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<entry><varname>bochs</varname></entry>
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<entry>Bochs Emulator</entry>
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</row>
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<row>
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<entry><varname>uml</varname></entry>
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<entry>User-mode Linux</entry>
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</row>
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<row>
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<entry><varname>parallels</varname></entry>
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<entry>Parallels Desktop, Parallels Server</entry>
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</row>
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<row>
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<entry valign="top" morerows="5">Container</entry>
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<entry><varname>openvz</varname></entry>
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<entry>OpenVZ/Virtuozzo</entry>
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</row>
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<row>
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<entry><varname>lxc</varname></entry>
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<entry>Linux container implementation by LXC</entry>
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</row>
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<row>
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<entry><varname>lxc-libvirt</varname></entry>
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<entry>Linux container implementation by libvirt</entry>
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</row>
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<row>
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<entry><varname>systemd-nspawn</varname></entry>
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<entry>systemd's minimal container implementation, see <citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry></entry>
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</row>
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<row>
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<entry><varname>docker</varname></entry>
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<entry>Docker container manager</entry>
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</row>
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<row>
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<entry><varname>rkt</varname></entry>
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<entry>rkt app container runtime</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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<para>If multiple virtualization solutions are used, only the
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"innermost" is detected and identified. That means if both
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machine and container virtualization are used in
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conjunction, only the latter will be identified (unless
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<option>--vm</option> is passed).</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>The following options are understood:</para>
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<variablelist>
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<varlistentry>
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<term><option>-c</option></term>
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<term><option>--container</option></term>
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<listitem><para>Only detects container virtualization (i.e.
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shared kernel virtualization).</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-v</option></term>
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<term><option>--vm</option></term>
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<listitem><para>Only detects hardware virtualization).</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-r</option></term>
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<term><option>--chroot</option></term>
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<listitem><para>Detect whether invoked in a
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<citerefentry><refentrytitle>chroot</refentrytitle><manvolnum>2</manvolnum></citerefentry>
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environment. In this mode, no output is written, but the return
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value indicates whether the process was invoked in a
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<function>chroot()</function>
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environment or not.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-q</option></term>
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<term><option>--quiet</option></term>
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<listitem><para>Suppress output of the virtualization
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technology identifier.</para></listitem>
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</varlistentry>
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<xi:include href="standard-options.xml" xpointer="help" />
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<xi:include href="standard-options.xml" xpointer="version" />
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Exit status</title>
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<para>If a virtualization technology is detected, 0 is returned, a
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non-zero code otherwise.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>chroot</refentrytitle><manvolnum>2</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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