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[thirdparty/systemd.git] / man / machinectl.xml

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<!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="machinectl" conditional='ENABLE_MACHINED'
    xmlns:xi="http://www.w3.org/2001/XInclude">

  <refentryinfo>
    <title>machinectl</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>machinectl</refentrytitle>
    <manvolnum>1</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>machinectl</refname>
    <refpurpose>Control the systemd machine manager</refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <cmdsynopsis>
      <command>machinectl</command>
      <arg choice="opt" rep="repeat">OPTIONS</arg>
      <arg choice="req">COMMAND</arg>
      <arg choice="opt" rep="repeat">NAME</arg>
    </cmdsynopsis>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para><command>machinectl</command> may be used to introspect and
    control the state of the
    <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
    virtual machine and container registration manager
    <citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
  </refsect1>

  <refsect1>
    <title>Options</title>

    <para>The following options are understood:</para>

    <variablelist>
      <varlistentry>
        <term><option>-p</option></term>
        <term><option>--property=</option></term>

        <listitem><para>When showing machine or image properties,
        limit the output to certain properties as specified by the
        argument. If not specified, all set properties are shown. The
        argument should be a property name, such as
        <literal>Name</literal>. If specified more than once, all
        properties with the specified names are
        shown.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>-a</option></term>
        <term><option>--all</option></term>

        <listitem><para>When showing machine or image properties, show
        all properties regardless of whether they are set or
        not.</para>

        <para>When listing VM or container images, do not suppress
        images beginning in a dot character
        (<literal>.</literal>).</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>-l</option></term>
        <term><option>--full</option></term>

        <listitem><para>Do not ellipsize process tree entries.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--no-ask-password</option></term>

        <listitem><para>Do not query the user for authentication for
        privileged operations.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--kill-who=</option></term>

        <listitem><para>When used with <command>kill</command>, choose
        which processes to kill. Must be one of
        <option>leader</option>, or <option>all</option> to select
        whether to kill only the leader process of the machine or all
        processes of the machine. If omitted, defaults to
        <option>all</option>.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>-s</option></term>
        <term><option>--signal=</option></term>

        <listitem><para>When used with <command>kill</command>, choose
        which signal to send to selected processes. Must be one of the
        well-known signal specifiers, such as
        <constant>SIGTERM</constant>, <constant>SIGINT</constant> or
        <constant>SIGSTOP</constant>. If omitted, defaults to
        <constant>SIGTERM</constant>.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--mkdir</option></term>

        <listitem><para>When used with <command>bind</command> creates
        the destination directory before applying the bind
        mount.</para></listitem>
      </varlistentry>


      <varlistentry>
        <term><option>--read-only</option></term>

        <listitem><para>When used with <command>bind</command> applies
        a read-only bind mount.</para></listitem>
      </varlistentry>


      <varlistentry>
        <term><option>-n</option></term>
        <term><option>--lines=</option></term>

        <listitem><para>When used with <command>status</command>,
        controls the number of journal lines to show, counting from
        the most recent ones. Takes a positive integer argument.
        Defaults to 10.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><option>-o</option></term>
        <term><option>--output=</option></term>

        <listitem><para>When used with <command>status</command>,
        controls the formatting of the journal entries that are shown.
        For the available choices, see
        <citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
        Defaults to <literal>short</literal>.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--verify=</option></term>

        <listitem><para>When downloading a container or VM image,
        specify whether the image shall be verified before it is made
        available. Takes one of <literal>no</literal>,
        <literal>checksum</literal> and <literal>signature</literal>.
        If <literal>no</literal> no verification is done. If
        <literal>checksum</literal> is specified the download is
        checked for integrity after transfer is complete, but no
        signatures are verified. If <literal>signature</literal> is
        specified, the checksum is verified and the images's signature
        is checked against a local keyring of trustable vendors. It is
        strongly recommended to set this option to
        <literal>signature</literal> if the server and protocol
        support this. Defaults to
        <literal>signature</literal>.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--force</option></term>

        <listitem><para>When downloading a container or VM image, and
        a local copy by the specified local machine name already
        exists, delete it first and replace it by the newly downloaded
        image.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--dkr-index-url</option></term>

        <listitem><para>Specifies the index server to use for
        downloading <literal>dkr</literal> images with the
        <command>pull-dkr</command>. Takes a
        <literal>http://</literal>, <literal>https://</literal>
        URL.</para></listitem>
      </varlistentry>

      <xi:include href="user-system-options.xml" xpointer="host" />
      <xi:include href="user-system-options.xml" xpointer="machine" />

      <xi:include href="standard-options.xml" xpointer="no-pager" />
      <xi:include href="standard-options.xml" xpointer="no-legend" />
      <xi:include href="standard-options.xml" xpointer="help" />
      <xi:include href="standard-options.xml" xpointer="version" />
    </variablelist>
  </refsect1>

  <refsect1>
    <title>Commands</title>

    <para>The following commands are understood:</para>

    <refsect2><title>Machine Commands</title><variablelist>

      <varlistentry>
        <term><command>list</command></term>

        <listitem><para>List currently running (online) virtual
        machines and containers. To enumerate container images that
        can be started, use <command>list-images</command> (see
        below).</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><command>status</command> <replaceable>NAME</replaceable>...</term>

        <listitem><para>Show terse runtime status information about
        one or more virtual machines and containers, followed by the
        most recent log data from the journal. This function is
        intended to generate human-readable output. If you are looking
        for computer-parsable output, use <command>show</command>
        instead. Note that the log data shown is reported by the
        virtual machine or container manager, and frequently contains
        console output of the machine, but not necessarily journal
        contents of the machine itself.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><command>show</command> <replaceable>NAME</replaceable>...</term>

        <listitem><para>Show properties of one or more registered
        virtual machines or containers or the manager itself. If no
        argument is specified, properties of the manager will be
        shown. If an NAME is specified, properties of this virtual
        machine or container are shown. By default, empty properties
        are suppressed. Use <option>--all</option> to show those too.
        To select specific properties to show, use
        <option>--property=</option>. This command is intended to be
        used whenever computer-parsable output is required. Use
        <command>status</command> if you are looking for formatted
        human-readable output.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><command>start</command> <replaceable>NAME</replaceable>...</term>

        <listitem><para>Start a container as a system service, using
        <citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
        This starts <filename>systemd-nspawn@.service</filename>,
        instantiated for the specified machine name, similar to the
        effect of <command>systemctl start</command> on the service
        name. <command>systemd-nspawn</command> looks for a container
        image by the specified name in
        <filename>/var/lib/machines/</filename> (and other search
        paths, see below) and runs it. Use
        <command>list-images</command> (see below), for listing
        available container images to start.</para>

        <para>Note that
        <citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
        also interfaces with a variety of other container and VM
        managers, <command>systemd-nspawn</command> is just one
        implementation of it. Most of the commands available in
        <command>machinectl</command> may be used on containers or VMs
        controlled by other managers, not just
        <command>systemd-nspawn</command>. Starting VMs and container
        images on those managers requires manager-specific
        tools.</para>

        <para>To interactively start a container on the command line
        with full access to the container's console, please invoke
        <command>systemd-nspawn</command> directly. To stop a running
        container use <command>machinectl poweroff</command>, see
        below.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><command>login</command> <replaceable>NAME</replaceable></term>

        <listitem><para>Open an interactive terminal login session to
        a container. This will create a TTY connection to a specific
        container and asks for the execution of a getty on it. Note
        that this is only supported for containers running
        <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
        as init system.</para>

        <para>This command will open a full login prompt on the
        container, which then asks for username and password. Use
        <citerefentry><refentrytitle>systemd-run</refentrytitle><manvolnum>1</manvolnum></citerefentry>
        with the <option>--machine=</option> switch to invoke a single
        command, either interactively or in the background within a
        local container.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><command>enable</command> <replaceable>NAME</replaceable>...</term>
        <term><command>disable</command> <replaceable>NAME</replaceable>...</term>

        <listitem><para>Enable or disable a container as a system
        service to start at system boot, using
        <citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
        This enables or disables
        <filename>systemd-nspawn@.service</filename>, instantiated for
        the specified machine name, similar to the effect of
        <command>systemctl enable</command> or <command>systemctl
        disable</command> on the service name.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><command>poweroff</command> <replaceable>NAME</replaceable>...</term>

        <listitem><para>Power off one or more containers. This will
        trigger a reboot by sending SIGRTMIN+4 to the container's init
        process, which causes systemd-compatible init systems to shut
        down cleanly. This operation does not work on containers that
        do not run a
        <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>-compatible
        init system, such as sysvinit. Use
        <command>terminate</command> (see below) to immediately
        terminate a container or VM, without cleanly shutting it
        down.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><command>reboot</command> <replaceable>NAME</replaceable>...</term>

        <listitem><para>Reboot one or more containers. This will
        trigger a reboot by sending SIGINT to the container's init
        process, which is roughly equivalent to pressing Ctrl+Alt+Del
        on a non-containerized system, and is compatible with
        containers running any system manager.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><command>terminate</command> <replaceable>NAME</replaceable>...</term>

        <listitem><para>Immediately terminates a virtual machine or
        container, without cleanly shutting it down. This kills all
        processes of the virtual machine or container and deallocates
        all resources attached to that instance. Use
        <command>poweroff</command> to issue a clean shutdown
        request.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><command>kill</command> <replaceable>NAME</replaceable>...</term>

        <listitem><para>Send a signal to one or more processes of the
        virtual machine or container. This means processes as seen by
        the host, not the processes inside the virtual machine or
        container. Use <option>--kill-who=</option> to select which
        process to kill. Use <option>--signal=</option> to select the
        signal to send.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><command>bind</command> <replaceable>NAME</replaceable> <replaceable>PATH</replaceable> [<replaceable>PATH</replaceable>]</term>

        <listitem><para>Bind mounts a directory from the host into the
        specified container. The first directory argument is the
        source directory on the host, the second directory argument
        the source directory on the host. When the latter is omitted
        the destination path in the container is the same as the
        source path on the host. When combined with the
        <option>--read-only</option> switch a ready-only bind mount is
        created. When combined with the <option>--mkdir</option>
        switch the destination path is first created before the mount
        is applied. Note that this option is currently only supported
        for
        <citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry>
        containers.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><command>copy-to</command> <replaceable>NAME</replaceable> <replaceable>PATH</replaceable> [<replaceable>PATH</replaceable>]</term>

        <listitem><para>Copies files or directories from the host
        system into a running container. Takes a container name,
        followed by the source path on the host and the destination
        path in the container. If the destination path is omitted the
        same as the source path is used.</para></listitem>
      </varlistentry>


      <varlistentry>
        <term><command>copy-from</command> <replaceable>NAME</replaceable> <replaceable>PATH</replaceable> [<replaceable>PATH</replaceable>]</term>

        <listitem><para>Copies files or directories from a container
        into the host system. Takes a container name, followed by the
        source path in the container the destination path on the host.
        If the destination path is omitted the same as the source path
        is used.</para></listitem>
      </varlistentry>
    </variablelist></refsect2>

    <refsect2><title>Image Commands</title><variablelist>

      <varlistentry>
        <term><command>list-images</command></term>

        <listitem><para>Show a list of locally installed container and
        VM images. This enumerates all raw disk images and container
        directories and subvolumes in
        <filename>/var/lib/machines/</filename> (and other search
        paths, see below). Use <command>start</command> (see above) to
        run a container off one of the listed images. Note that by
        default containers whose name begins with a dot
        (<literal>.</literal>) are not shown. To show these too,
        specify <option>--all</option>. Note that a special image
        <literal>.host</literal> always implicitly exists and refers
        to the image the host itself is booted from.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><command>image-status</command> <replaceable>NAME</replaceable>...</term>

        <listitem><para>Show terse status information about one or
        more container or VM images. This function is intended to
        generate human-readable output. Use
        <command>show-image</command> (see below) to generate
        computer-parsable output instead.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><command>show-image</command> <replaceable>NAME</replaceable>...</term>

        <listitem><para>Show properties of one or more registered
        virtual machine or container images, or the manager itself. If
        no argument is specified, properties of the manager will be
        shown. If an NAME is specified, properties of this virtual
        machine or container image are shown. By default, empty
        properties are suppressed. Use <option>--all</option> to show
        those too. To select specific properties to show, use
        <option>--property=</option>. This command is intended to be
        used whenever computer-parsable output is required. Use
        <command>image-status</command> if you are looking for
        formatted human-readable output.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><command>clone</command> <replaceable>NAME</replaceable> <replaceable>NAME</replaceable></term>

        <listitem><para>Clones a container or VM image. The
        arguments specify the name of the image to clone and the name
        of the newly cloned image. Note that plain directory container
        images are cloned into subvolume images with this command.
        Note that cloning a container or VM image is optimized for
        btrfs file systems, and might not be efficient on others, due
        to file system limitations.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><command>rename</command> <replaceable>NAME</replaceable> <replaceable>NAME</replaceable></term>

        <listitem><para>Renames a container or VM image. The
        arguments specify the name of the image to rename and the new
        name of the image.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><command>read-only</command> <replaceable>NAME</replaceable> [<replaceable>BOOL</replaceable>]</term>

        <listitem><para>Marks or (unmarks) a container or VM image
        read-only. Takes a VM or container image name, followed by a
        boolean as arguments. If the boolean is omitted, positive is
        implied, i.e. the image is marked read-only.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><command>remove</command> <replaceable>NAME</replaceable>...</term>

        <listitem><para>Removes one or more container or VM images.
        The special image <literal>.host</literal>, which refers to
        the host's own directory tree may not be
        removed.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><command>set-limit</command> [<replaceable>NAME</replaceable>] <replaceable>BYTES</replaceable></term>

        <listitem><para>Sets the maximum size in bytes a specific
        container or VM image, or all images may grow up to on disk
        (disk quota). Takes either one or two parameters. The first,
        optional parameter refers to a container or VM image name. If
        specified the size limit of the specified image is changed. If
        omitted the overall size limit of the sum of all images stored
        locally is changed. The final argument specifies the size
        limit in bytes, possibly suffixed by the usual K, M, G, T
        units. If the size limit shall be disabled, specify
        <literal>-</literal> as size.</para>

        <para>Note that per-container size limits are only supported
        on btrfs file systems. Also note that if
        <command>set-limit</command> is invoked without image
        parameter, and <filename>/var/lib/machines</filename> is
        empty, and the directory is not located on btrfs, a btrfs
        loopback file is implicitly created as
        <filename>/var/lib/machines.raw</filename> with the given
        size, and mounted to
        <filename>/var/lib/machines</filename>. The size of the
        loopback may later be readjusted with
        <command>set-limit</command>, as well. If such a
        loopback-mounted <filename>/var/lib/machines</filename>
        directory is used <command>set-limit</command> without image
        name alters both the quota setting within the file system as
        well as the loopback file and file system size
        itself.</para></listitem>
      </varlistentry>

    </variablelist></refsect2>

    <refsect2><title>Image Transfer Commands</title><variablelist>

      <varlistentry>
        <term><command>pull-tar</command> <replaceable>URL</replaceable> [<replaceable>NAME</replaceable>]</term>

        <listitem><para>Downloads a <filename>.tar</filename>
        container image from the specified URL, and makes it available
        under the specified local machine name. The URL must be of
        type <literal>http://</literal> or
        <literal>https://</literal>, and must refer to a
        <filename>.tar</filename>, <filename>.tar.gz</filename>,
        <filename>.tar.xz</filename> or <filename>.tar.bz2</filename>
        archive file. If the local machine name is omitted the name it
        is automatically derived from the last component of the URL,
        with its suffix removed.</para>

        <para>The image is verified before it is made available,
        unless <option>--verify=no</option> is specified. Verification
        is done via SHA256SUMS and SHA256SUMS.gpg files, that need to
        be made available on the same web server, under the same URL
        as the <filename>.tar</filename> file, but with the last
        component (the filename) of the URL replaced. With
        <option>--verify=checksum</option> only the SHA256 checksum
        for the file is verified, based on the
        <filename>SHA256SUMS</filename> file. With
        <option>--verify=signature</option> the SHA256SUMS file is
        first verified with detached GPG signature file
        <filename>SHA256SUMS.gpg</filename>. The public key for this
        verification step needs to be available in
        <filename>/usr/lib/systemd/import-pubring.gpg</filename> or
        <filename>/etc/systemd/import-pubring.gpg</filename>.</para>

        <para>The container image will be downloaded and stored in a
        read-only subvolume in
        <filename>/var/lib/machines/</filename>, that is named after
        the specified URL and its HTTP etag. A writable snapshot is
        then taken from this subvolume, and named after the specified
        local name. This behaviour ensures that creating multiple
        container instances of the same URL is efficient, as multiple
        downloads are not necessary. In order to create only the
        read-only image, and avoid creating its writable snapshot,
        specify <literal>-</literal> as local machine name.</para>

        <para>Note that the read-only subvolume is prefixed with
        <filename>.tar-</filename>, and is thus now shown by
        <command>list-images</command>, unless <option>--all</option>
        is passed.</para>

        <para>Note that pressing C-c during execution of this command
        will not abort the download. Use
        <command>cancel-transfer</command>, described
        below.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><command>pull-raw</command> <replaceable>URL</replaceable> [<replaceable>NAME</replaceable>]</term>

        <listitem><para>Downloads a <filename>.raw</filename>
        container or VM disk image from the specified URL, and makes
        it available under the specified local machine name. The URL
        must be of type <literal>http://</literal> or
        <literal>https://</literal>. The container image must either
        be a <filename>.qcow2</filename> or raw disk image, optionally
        compressed as <filename>.gz</filename>,
        <filename>.xz</filename>, or <filename>.bz2</filename>. If the
        local machine name is omitted the name it is automatically
        derived from the last component of the URL, with its suffix
        removed.</para>

        <para>Image verification is identical for raw and tar images
        (see above).</para>

        <para>If the the downloaded image is in
        <filename>.qcow2</filename> format it es converted into a raw
        image file before it is made available.</para>

        <para>Downloaded images of this type will be placed as
        read-only <filename>.raw</filename> file in
        <filename>/var/lib/machines/</filename>. A local, writable
        (reflinked) copy is then made under the specified local
        machine name. To omit creation of the local, writable copy
        pass <literal>-</literal> as local machine name.</para>

        <para>Similar to the behaviour of <command>pull-tar</command>,
        the read-only image is prefixed with
        <filename>.raw-</filename>, and thus now shown by
        <command>list-images</command>, unless <option>--all</option>
        is passed.</para>

        <para>Note that pressing C-c during execution of this command
        will not abort the download. Use
        <command>cancel-transfer</command>, described
        below.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><command>pull-dkr</command> <replaceable>REMOTE</replaceable> [<replaceable>NAME</replaceable>]</term>

        <listitem><para>Downloads a <literal>dkr</literal> container
        image and makes it available locally. The remote name refers
        to a <literal>dkr</literal> container name. If omitted, the
        local machine name is derived from the <literal>dkr</literal>
        container name.</para>

        <para>Image verification is not available for
        <literal>dkr</literal> containers, and thus
        <option>--verify=no</option> must always be specified with
        this command.</para>

        <para>This command downloads all (missing) layers for the
        specified container and places them in read-only subvolumes in
        <filename>/var/lib/machines/</filename>. A writable snapshot
        of the newest layer is then created under the specified local
        machine name. To omit creation of this writable snapshot, pass
        <literal>-</literal> as local machine name.</para>

        <para>The read-only layer subvolumes are prefixed with
        <filename>.dkr-</filename>, and thus now shown by
        <command>list-images</command>, unless <option>--all</option>
        is passed.</para>

        <para>To specify the <literal>dkr</literal> index server to
        use for looking up the specified container, use
        <option>--dkr-index-url=</option>.</para>

        <para>Note that pressing C-c during execution of this command
        will not abort the download. Use
        <command>cancel-transfer</command>, described
        below.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><command>list-transfers</command></term>

        <listitem><para>Shows a list of container or VM image
        downloads that are currently in progress.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><command>cancel-transfers</command> <replaceable>ID</replaceable>...</term>

        <listitem><para>Aborts download of the container or VM image
        with the specified ID. To list ongoing transfers and their
        IDs, use <command>list-transfers</command>. </para></listitem>
      </varlistentry>

    </variablelist></refsect2>

  </refsect1>

  <refsect1>
    <title>Files and Directories</title>

    <para>Machine images are preferably stored in
    <filename>/var/lib/machines/</filename>, but are also searched for
    in <filename>/usr/local/lib/machines/</filename> and
    <filename>/usr/lib/machines/</filename>. For compatibility reasons
    the directory <filename>/var/lib/container/</filename> is
    searched, too. Note that images stored below
    <filename>/usr</filename> are always considered read-only. It is
    possible to symlink machines images from other directories into
    <filename>/var/lib/machines/</filename> to make them available for
    control with <command>machinectl</command>.</para>

    <para>Note that many image operations are only supported,
    efficient or atomic on btrfs file systems. Due to this, if the
    <command>pull-tar</command>, <command>pull-raw</command>,
    <command>pull-dkr</command> and <command>set-limit</command>
    commands notice that <filename>/var/lib/machines</filename> is
    empty and not located on btrfs, they will implicitly set up a
    loopback file <filename>/var/lib/machines.raw</filename>
    containing a btrfs file system that is mounted to
    <filename>/var/lib/machines</filename>. The size of this loopback
    file may be controlled dynamically with <command>set-limit</command>.</para>

    <para>Disk images are understood by
    <citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry>
    and <command>machinectl</command> in three formats:</para>

    <itemizedlist>
      <listitem><para>A simple directory tree, containing the files
      and directories of the container to boot.</para></listitem>

      <listitem><para>A subvolume (on btrfs file systems), which are
      similar to the simple directories, described above. However,
      they have additional benefits, such as efficient cloning and
      quota reporting.</para></listitem>

      <listitem><para>"Raw" disk images, i.e. binary images of disks
      with a GPT or MBR partition table. Images of this type are
      regular files with the suffix
      <literal>.raw</literal>.</para></listitem>
    </itemizedlist>

    <para>See
    <citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry>
    for more information on image formats, in particular it's
    <option>--directory=</option> and <option>--image=</option>
    options.</para>
  </refsect1>

  <refsect1>
    <title>Examples</title>
    <example>
      <title>Download an Ubuntu image and open a shell in it</title>

      <programlisting># machinectl pull-tar https://cloud-images.ubuntu.com/trusty/current/trusty-server-cloudimg-amd64-root.tar.gz
# systemd-nspawn -M trusty-server-cloudimg-amd64-root</programlisting>

      <para>This downloads and verifies the specified
      <filename>.tar</filename> image, and then uses
      <citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry>
      to open a shell in it.</para>
    </example>

    <example>
      <title>Download a Fedora image, set a root password in it, start
      it as service</title>

      <programlisting># machinectl pull-raw --verify=no http://ftp.halifax.rwth-aachen.de/fedora/linux/releases/21/Cloud/Images/x86_64/Fedora-Cloud-Base-20141203-21.x86_64.raw.xz
# systemd-nspawn -M Fedora-Cloud-Base-20141203-21
# passwd
# exit
# machinectl start Fedora-Cloud-Base-20141203-21
# machinectl login Fedora-Cloud-Base-20141203-21</programlisting>

      <para>This downloads the specified <filename>.raw</filename>
      image with verification disabled. Then a shell is opened in it
      and a root password is set. Afterwards the shell is left, and
      the machine started as system service. With the last command a
      login prompt into the container is requested.</para>
    </example>

    <example>
      <title>Download a Fedora <literal>dkr</literal> image</title>

      <programlisting># machinectl pull-dkr --verify=no mattdm/fedora
# systemd-nspawn -M fedora</programlisting>

      <para>Downloads a <literal>dkr</literal> image and opens a shell
      in it. Note that the specified download command might require an
      index server to be specified with the
      <literal>--dkr-index-url=</literal>.</para>
    </example>
  </refsect1>

  <refsect1>
    <title>Exit status</title>

    <para>On success, 0 is returned, a non-zero failure code
    otherwise.</para>
  </refsect1>

  <xi:include href="less-variables.xml" />

  <refsect1>
    <title>See Also</title>
    <para>
      <citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>
    </para>
  </refsect1>

</refentry>