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">
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   8   Copyright 2010 Lennart Poettering
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  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
  61                 execution in a virtualized environment. It identifies
  62                 the virtualization technology and can distinguish full
  63                 VM virtualization from container
  64                 virtualization. <filename>systemd-detect-virt</filename>
  65                 exits with a return value of 0 (success) if a
  66                 virtualization technology is detected, and non-zero
  67                 (error) otherwise. By default any type of
  68                 virtualization is detected, and the options
  69                 <option>--container</option> and <option>--vm</option>
  70                 can be used to limit what types of virtualization are
  71                 detected.</para>
  72
  73                 <para>When executed without <option>--quiet</option>
  74                 will print a short identifier for the detected
  75                 virtualization technology. The following technologies
  76                 are currently identified:</para>
  77
  78                 <table>
  79                   <title>Known virtualization technologies (both
  80                   VM, i.e. full hardware virtualization,
  81                   and container, i.e. shared kernel virtualization)</title>
  82                   <tgroup cols='3' align='left' colsep='1' rowsep='1'>
  83                     <colspec colname="type" />
  84                     <colspec colname="id" />
  85                     <colspec colname="product" />
  86                     <thead>
  87                       <row>
  88                         <entry>Type</entry>
  89                         <entry>ID</entry>
  90                         <entry>Product</entry>
  91                       </row>
  92                     </thead>
  93                     <tbody>
  94                       <row>
  95                         <entry morerows="8">VM</entry>
  96                         <entry><varname>qemu</varname></entry>
  97                         <entry>QEMU software virtualization</entry>
  98                       </row>
  99
 100                       <row>
 101                         <entry><varname>kvm</varname></entry>
 102                         <entry>Linux KVM kernel virtual machine</entry>
 103                       </row>
 104
 105                       <row>
 106                         <entry><varname>zvm</varname></entry>
 107                         <entry>s390 z/VM</entry>
 108                       </row>
 109
 110                       <row>
 111                         <entry><varname>vmware</varname></entry>
 112                         <entry>VMware Workstation or Server, and related products</entry>
 113                       </row>
 114
 115                       <row>
 116                         <entry><varname>microsoft</varname></entry>
 117                         <entry>Hyper-V, also known as Viridian or Windows Server Virtualization</entry>
 118                       </row>
 119
 120                       <row>
 121                         <entry><varname>oracle</varname></entry>
 122                         <entry>Oracle VM VirtualBox (historically marketed by innotek and Sun Microsystems)</entry>
 123                       </row>
 124
 125                       <row>
 126                         <entry><varname>xen</varname></entry>
 127                         <entry>Xen hypervisor (only domU, not dom0)</entry>
 128                       </row>
 129
 130                       <row>
 131                         <entry><varname>bochs</varname></entry>
 132                         <entry>Bochs Emulator</entry>
 133                       </row>
 134
 135                       <row>
 136                         <entry><varname>uml</varname></entry>
 137                         <entry>User-mode Linux</entry>
 138                       </row>
 139
 140                       <row>
 141                         <entry morerows="5">container</entry>
 142                         <entry><varname>openvz</varname></entry>
 143                         <entry>OpenVZ/Virtuozzo</entry>
 144                       </row>
 145
 146                       <row>
 147                         <entry><varname>lxc</varname></entry>
 148                         <entry>Linux container implementation by LXC</entry>
 149                       </row>
 150
 151                       <row>
 152                         <entry><varname>lxc-libvirt</varname></entry>
 153                         <entry>Linux container implementation by libvirt</entry>
 154                       </row>
 155
 156                       <row>
 157                          <entry><varname>systemd-nspawn</varname></entry>
 158                          <entry>systemd's minimal container implementation, see <citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry></entry>
 159                       </row>
 160
 161                       <row>
 162                         <entry><varname>docker</varname></entry>
 163                         <entry>Docker container manager</entry>
 164                       </row>
 165                     </tbody>
 166                   </tgroup>
 167                 </table>
 168
 169                 <para>If multiple virtualization solutions are used,
 170                 only the "innermost" is detected and identified. That
 171                 means if both VM virtualization and container
 172                 virtualization are used in conjunction, only the latter
 173                 will be identified (unless <option>--vm</option> is
 174                 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
 188                                 virtualization (i.e. shared kernel
 189                                 virtualization).</para></listitem>
 190                         </varlistentry>
 191
 192                         <varlistentry>
 193                                 <term><option>-v</option></term>
 194                                 <term><option>--vm</option></term>
 195
 196                                 <listitem><para>Only detects VM
 197                                 virtualization (i.e. full hardware
 198                                 virtualization).</para></listitem>
 199                         </varlistentry>
 200
 201                         <varlistentry>
 202                                 <term><option>-q</option></term>
 203                                 <term><option>--quiet</option></term>
 204
 205                                 <listitem><para>Suppress output of the
 206                                 virtualization technology
 207                                 identifier.</para></listitem>
 208                         </varlistentry>
 209
 210                         <xi:include href="standard-options.xml" xpointer="help" />
 211                         <xi:include href="standard-options.xml" xpointer="version" />
 212                 </variablelist>
 213
 214         </refsect1>
 215
 216         <refsect1>
 217                 <title>Exit status</title>
 218
 219                 <para>If a virtualization technology is detected, 0 is
 220                 returned, a non-zero code otherwise.</para>
 221         </refsect1>
 222
 223         <refsect1>
 224                 <title>See Also</title>
 225                 <para>
 226                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 227                         <citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry>
 228                 </para>
 229         </refsect1>
 230
 231 </refentry>