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diff --git a/src/grp-machine/machinectl/machinectl.xml b/src/grp-machine/machinectl/machinectl.xml new file mode 100644 index 0000000000..5a6ec294d2 --- /dev/null +++ b/src/grp-machine/machinectl/machinectl.xml @@ -0,0 +1,1029 @@ +<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*--> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" + "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> + +<!-- + This file is part of systemd. + + Copyright 2013 Zbigniew Jędrzejewski-Szmek + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +--> + +<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> + + <para><command>machinectl</command> may be used to execute + operations on machines and images. Machines in this sense are + considered running instances of:</para> + + <itemizedlist> + <listitem><para>Virtual Machines (VMs) that virtualize hardware + to run full operating system (OS) instances (including their kernels) + in a virtualized environment on top of the host OS.</para></listitem> + + <listitem><para>Containers that share the hardware and + OS kernel with the host OS, in order to run + OS userspace instances on top the host OS.</para></listitem> + + <listitem><para>The host system itself</para></listitem> + </itemizedlist> + + <para>Machines are identified by names that follow the same rules + as UNIX and DNS host names, for details, see below. Machines are + instantiated from disk or file system images that frequently — but not + necessarily — carry the same name as machines running from + them. Images in this sense are considered:</para> + + <itemizedlist> + <listitem><para>Directory trees containing an OS, including its + top-level directories <filename>/usr</filename>, + <filename>/etc</filename>, and so on.</para></listitem> + + <listitem><para>btrfs subvolumes containing OS trees, similar to + normal directory trees.</para></listitem> + + <listitem><para>Binary "raw" disk images containing MBR or GPT + partition tables and Linux file system partitions.</para></listitem> + + <listitem><para>The file system tree of the host OS itself.</para></listitem> + </itemizedlist> + + </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> + + <para>When cleaning VM or container images, remove all images, not just hidden ones.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--value</option></term> + + <listitem><para>When printing properties with <command>show</command>, only print the value, + and skip the property name and <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>--uid=</option></term> + + <listitem><para>When used with the <command>shell</command> command, chooses the user ID to + open the interactive shell session as. If the argument to the <command>shell</command> + command also specifies a user name, this option is ignored. If the name is not specified + in either way, <literal>root</literal> will be used by default. Note that this switch is + not supported for the <command>login</command> command (see below).</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>-E <replaceable>NAME</replaceable>=<replaceable>VALUE</replaceable></option></term> + <term><option>--setenv=<replaceable>NAME</replaceable>=<replaceable>VALUE</replaceable></option></term> + + <listitem><para>When used with the <command>shell</command> command, sets an environment + variable to pass to the executed shell. Takes an environment variable name and value, + separated by <literal>=</literal>. This switch may be used multiple times to set multiple + environment variables. Note that this switch is not supported for the + <command>login</command> command (see below).</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> + + <para>When used with <command>clone</command>, <command>import-raw</command> or <command>import-tar</command> a + read-only container or VM image is created.</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 the transfer is complete, but no + signatures are verified. If <literal>signature</literal> is + specified, the checksum is verified and the image'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>--format=</option></term> + + <listitem><para>When used with the <option>export-tar</option> + or <option>export-raw</option> commands, specifies the + compression format to use for the resulting file. Takes one of + <literal>uncompressed</literal>, <literal>xz</literal>, + <literal>gzip</literal>, <literal>bzip2</literal>. By default, + the format is determined automatically from the image file + name passed.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--max-addresses=</option></term> + + <listitem><para>When used with the <option>list-machines</option> + command, limits the number of ip addresses output for every machine. + Defaults to 1. All addresses can be requested with <literal>all</literal> + as argument to <option>--max-addresses</option> . If the argument to + <option>--max-addresses</option> is less than the actual number + of addresses,<literal>...</literal>follows the last address. + If multiple addresses are to be written for a given machine, every + address except the first one is on a new line and is followed by + <literal>,</literal> if another address will be output afterwards. </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 machine images that can + be started, use <command>list-images</command> (see + below). Note that this command hides the special + <literal>.host</literal> machine by default. Use the + <option>--all</option> switch to show it.</para></listitem> + </varlistentry> + + <varlistentry> + <term><command>status</command> <replaceable>NAME</replaceable>...</term> + + <listitem><para>Show 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 a 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, and does not print the control group tree or journal entries. 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>.</para></listitem> + </varlistentry> + + <varlistentry> + <term><command>login</command> [<replaceable>NAME</replaceable>]</term> + + <listitem><para>Open an interactive terminal login session in + a container or on the local host. If an argument is supplied, + it refers to the container machine to connect to. If none is + specified, or the container name is specified as the empty + string, or the special machine name <literal>.host</literal> + (see below) is specified, the connection is made to the local + host instead. This will create a TTY connection to a specific + container or the local host 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 or the local host, which then asks for username and + password. Use <command>shell</command> (see below) or + <citerefentry><refentrytitle>systemd-run</refentrytitle><manvolnum>1</manvolnum></citerefentry> + with the <option>--machine=</option> switch to directly invoke + a single command, either interactively or in the + background.</para></listitem> + </varlistentry> + + <varlistentry> + <term><command>shell</command> [[<replaceable>NAME</replaceable>@]<replaceable>NAME</replaceable> [<replaceable>PATH</replaceable> [<replaceable>ARGUMENTS</replaceable>...]]] </term> + + <listitem><para>Open an interactive shell session in a + container or on the local host. The first argument refers to + the container machine to connect to. If none is specified, or + the machine name is specified as the empty string, or the + special machine name <literal>.host</literal> (see below) is + specified, the connection is made to the local host + instead. This works similar to <command>login</command> but + immediately invokes a user process. This command runs the + specified executable with the specified arguments, or + <filename>/bin/sh</filename> if none is specified. By default, + opens a <literal>root</literal> shell, but by using + <option>--uid=</option>, or by prefixing the machine name with + a username and an <literal>@</literal> character, a different + user may be selected. Use <option>--setenv=</option> to set + environment variables for the executed process.</para> + + <para>When using the <command>shell</command> command without + arguments, (thus invoking the executed shell or command on the + local host), it is in many ways similar to a <citerefentry + project='die-net'><refentrytitle>su</refentrytitle><manvolnum>1</manvolnum></citerefentry> + session, but, unlike <command>su</command>, completely isolates + the new session from the originating session, so that it + shares no process or session properties, and is in a clean and + well-defined state. It will be tracked in a new utmp, login, + audit, security and keyring session, and will not inherit any + environment variables or resource limits, among other + properties.</para> + + <para>Note that + <citerefentry><refentrytitle>systemd-run</refentrytitle><manvolnum>1</manvolnum></citerefentry> + may be used in place of the <command>shell</command> command, + and allows more detailed, low-level configuration of the + invoked unit. However, it is frequently more privileged than + the <command>shell</command> command.</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. Use <command>stop</command> as alias for <command>poweroff</command>. + 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 + is the destination directory in the container. 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 a 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 btrfs subvolume + images with this command, if the underlying file system supports this. 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> + + <para>Note that this command leaves host name, machine ID and + all other settings that could identify the instance + unmodified. The original image and the cloned copy will hence + share these credentials, and it might be necessary to manually + change them in the copy.</para> + + <para>If combined with the <option>--read-only</option> switch a read-only cloned image is + created.</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 that 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 an 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 an 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> + + <varlistentry> + <term><command>clean</command></term> + + <listitem><para>Remove hidden VM or container images (or all). This command removes all hidden machine images + from <filename>/var/lib/machines</filename>, i.e. those whose name begins with a dot. Use <command>machinectl + list-images --all</command> to see a list of all machine images, including the hidden ones.</para> + + <para>When combined with the <option>--all</option> switch removes all images, not just hidden ones. This + command effectively empties <filename>/var/lib/machines</filename>.</para> + + <para>Note that commands such as <command>machinectl pull-tar</command> or <command>machinectl + pull-raw</command> usually create hidden, read-only, unmodified machine images from the downloaded image first, + before cloning a writable working copy of it, in order to avoid duplicate downloads in case of images that are + reused multiple times. Use <command>machinectl clean</command> to remove old, hidden images created this + way.</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, 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 behavior 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 not 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, 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 downloaded image is in + <filename>.qcow2</filename> format it is 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 behavior of <command>pull-tar</command>, + the read-only image is prefixed with + <filename>.raw-</filename>, and thus not 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>import-tar</command> <replaceable>FILE</replaceable> [<replaceable>NAME</replaceable>]</term> + <term><command>import-raw</command> <replaceable>FILE</replaceable> [<replaceable>NAME</replaceable>]</term> + <listitem><para>Imports a TAR or RAW container or VM image, + and places it under the specified name in + <filename>/var/lib/machines/</filename>. When + <command>import-tar</command> is used, the file specified as + the first argument should be a tar archive, possibly compressed + with xz, gzip or bzip2. It will then be unpacked into its own + subvolume in <filename>/var/lib/machines</filename>. When + <command>import-raw</command> is used, the file should be a + qcow2 or raw disk image, possibly compressed with xz, gzip or + bzip2. If the second argument (the resulting image name) is + not specified, it is automatically derived from the file + name. If the file name is passed as <literal>-</literal>, the + image is read from standard input, in which case the second + argument is mandatory.</para> + + <para>Both <command>pull-tar</command> and <command>pull-raw</command> + will resize <filename>/var/lib/machines.raw</filename> and the + filesystem therein as necessary. Optionally, the + <option>--read-only</option> switch may be used to create a + read-only container or VM image. No cryptographic validation + is done when importing the images.</para> + + <para>Much like image downloads, ongoing imports may be listed + with <command>list-transfers</command> and aborted with + <command>cancel-transfer</command>.</para></listitem> + </varlistentry> + + <varlistentry> + <term><command>export-tar</command> <replaceable>NAME</replaceable> [<replaceable>FILE</replaceable>]</term> + <term><command>export-raw</command> <replaceable>NAME</replaceable> [<replaceable>FILE</replaceable>]</term> + <listitem><para>Exports a TAR or RAW container or VM image and + stores it in the specified file. The first parameter should be + a VM or container image name. The second parameter should be a + file path the TAR or RAW image is written to. If the path ends + in <literal>.gz</literal>, the file is compressed with gzip, if + it ends in <literal>.xz</literal>, with xz, and if it ends in + <literal>.bz2</literal>, with bzip2. If the path ends in + neither, the file is left uncompressed. If the second argument + is missing, the image is written to standard output. The + compression may also be explicitly selected with the + <option>--format=</option> switch. This is in particular + useful if the second parameter is left unspecified.</para> + + <para>Much like image downloads and imports, ongoing exports + may be listed with <command>list-transfers</command> and + aborted with + <command>cancel-transfer</command>.</para> + + <para>Note that, currently, only directory and subvolume images + may be exported as TAR images, and only raw disk images as RAW + images.</para></listitem> + </varlistentry> + + <varlistentry> + <term><command>list-transfers</command></term> + + <listitem><para>Shows a list of container or VM image + downloads, imports and exports that are currently in + progress.</para></listitem> + </varlistentry> + + <varlistentry> + <term><command>cancel-transfers</command> <replaceable>ID</replaceable>...</term> + + <listitem><para>Aborts a download, import or export 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>Machine and Image Names</title> + + <para>The <command>machinectl</command> tool operates on machines + and images whose names must be chosen following strict + rules. Machine names must be suitable for use as host names + following a conservative subset of DNS and UNIX/Linux + semantics. Specifically, they must consist of one or more + non-empty label strings, separated by dots. No leading or trailing + dots are allowed. No sequences of multiple dots are allowed. The + label strings may only consist of alphanumeric characters as well + as the dash and underscore. The maximum length of a machine name + is 64 characters.</para> + + <para>A special machine with the name <literal>.host</literal> + refers to the running host system itself. This is useful for execution + operations or inspecting the host system as well. Note that + <command>machinectl list</command> will not show this special + machine unless the <option>--all</option> switch is specified.</para> + + <para>Requirements on image names are less strict, however, they must be + valid UTF-8, must be suitable as file names (hence not be the + single or double dot, and not include a slash), and may not + contain control characters. Since many operations search for an + image by the name of a requested machine, it is recommended to name + images in the same strict fashion as machines.</para> + + <para>A special image with the name <literal>.host</literal> + refers to the image of the running host system. It hence + conceptually maps to the special <literal>.host</literal> machine + name described above. Note that <command>machinectl + list-images</command> will not show this special image either, unless + <option>--all</option> is specified.</para> + </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>import-tar</command>, <command>import-raw</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>Subvolumes (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 its + <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 https://dl.fedoraproject.org/pub/fedora/linux/releases/23/Cloud/x86_64/Images/Fedora-Cloud-Base-23-20151030.x86_64.raw.xz +# systemd-nspawn -M Fedora-Cloud-Base-23-20151030 +# passwd +# exit +# machinectl start Fedora-Cloud-Base-23-20151030 +# machinectl login Fedora-Cloud-Base-23-20151030</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>Exports a container image as tar file</title> + + <programlisting># machinectl export-tar fedora myfedora.tar.xz</programlisting> + + <para>Exports the container <literal>fedora</literal> as an + xz-compressed tar file <filename>myfedora.tar.xz</filename> into the + current directory.</para> + </example> + + <example> + <title>Create a new shell session</title> + + <programlisting># machinectl shell --uid=lennart</programlisting> + + <para>This creates a new shell session on the local host for + the user ID <literal>lennart</literal>, in a <citerefentry + project='die-net'><refentrytitle>su</refentrytitle><manvolnum>1</manvolnum></citerefentry>-like + fashion.</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>, + <citerefentry project='die-net'><refentrytitle>tar</refentrytitle><manvolnum>1</manvolnum></citerefentry>, + <citerefentry project='die-net'><refentrytitle>xz</refentrytitle><manvolnum>1</manvolnum></citerefentry>, + <citerefentry project='die-net'><refentrytitle>gzip</refentrytitle><manvolnum>1</manvolnum></citerefentry>, + <citerefentry project='die-net'><refentrytitle>bzip2</refentrytitle><manvolnum>1</manvolnum></citerefentry> + </para> + </refsect1> + +</refentry> |