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systemd-stable/man/systemd-detect-virt.xml

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<?xml version='1.0'?> <!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<refentry id="systemd-detect-virt"
xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>systemd-detect-virt</title>
<productname>systemd</productname>
<authorgroup>
<author>
<contrib>Developer</contrib>
<firstname>Lennart</firstname>
<surname>Poettering</surname>
<email>lennart@poettering.net</email>
</author>
</authorgroup>
</refentryinfo>
<refmeta>
<refentrytitle>systemd-detect-virt</refentrytitle>
<manvolnum>1</manvolnum>
</refmeta>
<refnamediv>
<refname>systemd-detect-virt</refname>
<refpurpose>Detect execution in a virtualized environment</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<command>systemd-detect-virt <arg choice="opt" rep="repeat">OPTIONS</arg></command>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><command>systemd-detect-virt</command> detects execution in
a virtualized environment. It identifies the virtualization
technology and can distinguish full VM virtualization from
container virtualization. <filename>systemd-detect-virt</filename>
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
<option>--container</option> and <option>--vm</option> can be used
to limit what types of virtualization are detected.</para>
<para>When executed without <option>--quiet</option> will print a
short identifier for the detected virtualization technology. The
following technologies are currently identified:</para>
<table>
<title>Known virtualization technologies (both
VM, i.e. full hardware virtualization,
and container, i.e. shared kernel virtualization)</title>
<tgroup cols='3' align='left' colsep='1' rowsep='1'>
<colspec colname="type" />
<colspec colname="id" />
<colspec colname="product" />
<thead>
<row>
<entry>Type</entry>
<entry>ID</entry>
<entry>Product</entry>
</row>
</thead>
<tbody>
<row>
<entry morerows="9">VM</entry>
<entry><varname>qemu</varname></entry>
<entry>QEMU software virtualization</entry>
</row>
<row>
<entry><varname>kvm</varname></entry>
<entry>Linux KVM kernel virtual machine</entry>
</row>
<row>
<entry><varname>zvm</varname></entry>
<entry>s390 z/VM</entry>
</row>
<row>
<entry><varname>vmware</varname></entry>
<entry>VMware Workstation or Server, and related products</entry>
</row>
<row>
<entry><varname>microsoft</varname></entry>
<entry>Hyper-V, also known as Viridian or Windows Server Virtualization</entry>
</row>
<row>
<entry><varname>oracle</varname></entry>
<entry>Oracle VM VirtualBox (historically marketed by innotek and Sun Microsystems)</entry>
</row>
<row>
<entry><varname>xen</varname></entry>
<entry>Xen hypervisor (only domU, not dom0)</entry>
</row>
<row>
<entry><varname>bochs</varname></entry>
<entry>Bochs Emulator</entry>
</row>
<row>
<entry><varname>uml</varname></entry>
<entry>User-mode Linux</entry>
</row>
<row>
<entry><varname>parallels</varname></entry>
<entry>Parallels Desktop, Parallels Server</entry>
</row>
<row>
<entry morerows="5">container</entry>
<entry><varname>openvz</varname></entry>
<entry>OpenVZ/Virtuozzo</entry>
</row>
<row>
<entry><varname>lxc</varname></entry>
<entry>Linux container implementation by LXC</entry>
</row>
<row>
<entry><varname>lxc-libvirt</varname></entry>
<entry>Linux container implementation by libvirt</entry>
</row>
<row>
<entry><varname>systemd-nspawn</varname></entry>
<entry>systemd's minimal container implementation, see <citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry></entry>
</row>
<row>
<entry><varname>docker</varname></entry>
<entry>Docker container manager</entry>
</row>
</tbody>
</tgroup>
</table>
<para>If multiple virtualization solutions are used, only the
"innermost" is detected and identified. That means if both VM
virtualization and container virtualization are used in
conjunction, only the latter will be identified (unless
<option>--vm</option> is passed).</para>
</refsect1>
<refsect1>
<title>Options</title>
<para>The following options are understood:</para>
<variablelist>
<varlistentry>
<term><option>-c</option></term>
<term><option>--container</option></term>
<listitem><para>Only detects container virtualization (i.e.
shared kernel virtualization).</para></listitem>
</varlistentry>
<varlistentry>
<term><option>-v</option></term>
<term><option>--vm</option></term>
<listitem><para>Only detects VM virtualization (i.e. full
hardware virtualization).</para></listitem>
</varlistentry>
<varlistentry>
<term><option>-q</option></term>
<term><option>--quiet</option></term>
<listitem><para>Suppress output of the virtualization
technology identifier.</para></listitem>
</varlistentry>
<xi:include href="standard-options.xml" xpointer="help" />
<xi:include href="standard-options.xml" xpointer="version" />
</variablelist>
</refsect1>
<refsect1>
<title>Exit status</title>
<para>If a virtualization technology is detected, 0 is returned, a
non-zero code otherwise.</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>