man/systemd-detect-virt.xml

   1 <?xml version='1.0'?> <!--*-nxml-*-->
   2 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
   3   "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
   4
   5 <!--
   6   This file is part of systemd.
   7
   8   Copyright 2010 Lennart Poettering
   9
  10   systemd is free software; you can redistribute it and/or modify it
  11   under the terms of the GNU Lesser General Public License as published by
  12   the Free Software Foundation; either version 2.1 of the License, or
  13   (at your option) any later version.
  14
  15   systemd is distributed in the hope that it will be useful, but
  16   WITHOUT ANY WARRANTY; without even the implied warranty of
  17   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  18   Lesser General Public License for more details.
  19
  20   You should have received a copy of the GNU Lesser General Public License
  21   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  22 -->
  23
  24 <refentry id="systemd-detect-virt"
  25     xmlns:xi="http://www.w3.org/2001/XInclude">
  26
  27   <refentryinfo>
  28     <title>systemd-detect-virt</title>
  29     <productname>systemd</productname>
  30
  31     <authorgroup>
  32       <author>
  33         <contrib>Developer</contrib>
  34         <firstname>Lennart</firstname>
  35         <surname>Poettering</surname>
  36         <email>lennart@poettering.net</email>
  37       </author>
  38     </authorgroup>
  39   </refentryinfo>
  40
  41   <refmeta>
  42     <refentrytitle>systemd-detect-virt</refentrytitle>
  43     <manvolnum>1</manvolnum>
  44   </refmeta>
  45
  46   <refnamediv>
  47     <refname>systemd-detect-virt</refname>
  48     <refpurpose>Detect execution in a virtualized environment</refpurpose>
  49   </refnamediv>
  50
  51   <refsynopsisdiv>
  52     <cmdsynopsis>
  53       <command>systemd-detect-virt <arg choice="opt" rep="repeat">OPTIONS</arg></command>
  54     </cmdsynopsis>
  55   </refsynopsisdiv>
  56
  57   <refsect1>
  58     <title>Description</title>
  59
  60     <para><command>systemd-detect-virt</command> detects execution in
  61     a virtualized environment. It identifies the virtualization
  62     technology and can distinguish full VM virtualization from
  63     container virtualization. <filename>systemd-detect-virt</filename>
  64     exits with a return value of 0 (success) if a virtualization
  65     technology is detected, and non-zero (error) otherwise. By default
  66     any type of virtualization is detected, and the options
  67     <option>--container</option> and <option>--vm</option> can be used
  68     to limit what types of virtualization are detected.</para>
  69
  70     <para>When executed without <option>--quiet</option> will print a
  71     short identifier for the detected virtualization technology. The
  72     following technologies are currently identified:</para>
  73
  74     <table>
  75       <title>Known virtualization technologies (both
  76       VM, i.e. full hardware virtualization,
  77       and container, i.e. shared kernel virtualization)</title>
  78       <tgroup cols='3' align='left' colsep='1' rowsep='1'>
  79         <colspec colname="type" />
  80         <colspec colname="id" />
  81         <colspec colname="product" />
  82         <thead>
  83           <row>
  84       <entry>Type</entry>
  85       <entry>ID</entry>
  86       <entry>Product</entry>
  87           </row>
  88         </thead>
  89         <tbody>
  90           <row>
  91       <entry morerows="9">VM</entry>
  92       <entry><varname>qemu</varname></entry>
  93       <entry>QEMU software virtualization</entry>
  94           </row>
  95
  96           <row>
  97       <entry><varname>kvm</varname></entry>
  98       <entry>Linux KVM kernel virtual machine</entry>
  99           </row>
 100
 101           <row>
 102       <entry><varname>zvm</varname></entry>
 103       <entry>s390 z/VM</entry>
 104           </row>
 105
 106           <row>
 107       <entry><varname>vmware</varname></entry>
 108       <entry>VMware Workstation or Server, and related products</entry>
 109           </row>
 110
 111           <row>
 112       <entry><varname>microsoft</varname></entry>
 113       <entry>Hyper-V, also known as Viridian or Windows Server Virtualization</entry>
 114           </row>
 115
 116           <row>
 117       <entry><varname>oracle</varname></entry>
 118       <entry>Oracle VM VirtualBox (historically marketed by innotek and Sun Microsystems)</entry>
 119           </row>
 120
 121           <row>
 122       <entry><varname>xen</varname></entry>
 123       <entry>Xen hypervisor (only domU, not dom0)</entry>
 124           </row>
 125
 126           <row>
 127       <entry><varname>bochs</varname></entry>
 128       <entry>Bochs Emulator</entry>
 129           </row>
 130
 131           <row>
 132       <entry><varname>uml</varname></entry>
 133       <entry>User-mode Linux</entry>
 134           </row>
 135
 136           <row>
 137       <entry><varname>parallels</varname></entry>
 138       <entry>Parallels Desktop, Parallels Server</entry>
 139           </row>
 140
 141           <row>
 142       <entry morerows="5">container</entry>
 143       <entry><varname>openvz</varname></entry>
 144       <entry>OpenVZ/Virtuozzo</entry>
 145           </row>
 146
 147           <row>
 148       <entry><varname>lxc</varname></entry>
 149       <entry>Linux container implementation by LXC</entry>
 150           </row>
 151
 152           <row>
 153       <entry><varname>lxc-libvirt</varname></entry>
 154       <entry>Linux container implementation by libvirt</entry>
 155           </row>
 156
 157           <row>
 158        <entry><varname>systemd-nspawn</varname></entry>
 159        <entry>systemd's minimal container implementation, see <citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry></entry>
 160           </row>
 161
 162           <row>
 163       <entry><varname>docker</varname></entry>
 164       <entry>Docker container manager</entry>
 165           </row>
 166         </tbody>
 167       </tgroup>
 168     </table>
 169
 170     <para>If multiple virtualization solutions are used, only the
 171     "innermost" is detected and identified. That means if both VM
 172     virtualization and container virtualization are used in
 173     conjunction, only the latter will be identified (unless
 174     <option>--vm</option> is passed).</para>
 175   </refsect1>
 176
 177   <refsect1>
 178     <title>Options</title>
 179
 180     <para>The following options are understood:</para>
 181
 182     <variablelist>
 183       <varlistentry>
 184         <term><option>-c</option></term>
 185         <term><option>--container</option></term>
 186
 187         <listitem><para>Only detects container virtualization (i.e.
 188         shared kernel virtualization).</para></listitem>
 189       </varlistentry>
 190
 191       <varlistentry>
 192         <term><option>-v</option></term>
 193         <term><option>--vm</option></term>
 194
 195         <listitem><para>Only detects VM virtualization (i.e. full
 196         hardware virtualization).</para></listitem>
 197       </varlistentry>
 198
 199       <varlistentry>
 200         <term><option>-q</option></term>
 201         <term><option>--quiet</option></term>
 202
 203         <listitem><para>Suppress output of the virtualization
 204         technology identifier.</para></listitem>
 205       </varlistentry>
 206
 207       <xi:include href="standard-options.xml" xpointer="help" />
 208       <xi:include href="standard-options.xml" xpointer="version" />
 209     </variablelist>
 210
 211   </refsect1>
 212
 213   <refsect1>
 214     <title>Exit status</title>
 215
 216     <para>If a virtualization technology is detected, 0 is returned, a
 217     non-zero code otherwise.</para>
 218   </refsect1>
 219
 220   <refsect1>
 221     <title>See Also</title>
 222     <para>
 223       <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 224       <citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry>
 225     </para>
 226   </refsect1>
 227
 228 </refentry>