Lennart Poettering
0c69794138
These lines are generally out-of-date, incomplete and unnecessary. With SPDX and git repository much more accurate and fine grained information about licensing and authorship is available, hence let's drop the per-file copyright notice. Of course, removing copyright lines of others is problematic, hence this commit only removes my own lines and leaves all others untouched. It might be nicer if sooner or later those could go away too, making git the only and accurate source of authorship information.
259 lines
8.4 KiB
XML
259 lines
8.4 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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SPDX-License-Identifier: LGPL-2.1+
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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</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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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="11">VM</entry>
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<entry><varname>qemu</varname></entry>
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<entry>QEMU software virtualization, without KVM</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, with whatever software, except Oracle Virtualbox</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), for legacy and KVM hypervisor</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><varname>bhyve</varname></entry>
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<entry>bhyve, FreeBSD hypervisor</entry>
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</row>
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<row>
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<entry><varname>qnx</varname></entry>
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<entry>QNX hypervisor</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>--private-users</option></term>
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<listitem><para>Detect whether invoked in a user namespace. In this mode, no
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output is written, but the return value indicates whether the process was invoked
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inside of a user namespace or not. See
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<citerefentry project='man-pages'><refentrytitle>user_namespaces</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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for more information.</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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<varlistentry>
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<term><option>--list</option></term>
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<listitem><para>Output all currently known and detectable container and VM environments.</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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<citerefentry project='man-pages'><refentrytitle>namespaces</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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