2 <!DOCTYPE refentry PUBLIC
"-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" >
4 <!-- SPDX-License-Identifier: LGPL-2.1+ -->
6 <refentry id=
"org.freedesktop.machine1" conditional='ENABLE_MACHINED'
7 xmlns:
xi=
"http://www.w3.org/2001/XInclude">
9 <title>org.freedesktop.machine1
</title>
10 <productname>systemd
</productname>
14 <refentrytitle>org.freedesktop.machine1
</refentrytitle>
15 <manvolnum>5</manvolnum>
19 <refname>org.freedesktop.machine1
</refname>
20 <refpurpose>The D-Bus interface of systemd-machined
</refpurpose>
24 <title>Introduction
</title>
27 <citerefentry><refentrytitle>systemd-machined.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>
28 is a system service that keeps track of locally running virtual machines and containers.
29 This page describes the D-Bus interface.
</para>
33 <title>The Manager Object
</title>
35 <para>The service exposes the following interfaces on the Manager object on the bus:
</para>
37 <programlisting executable=
"systemd-machined" node=
"/org/freedesktop/machine1" interface=
"org.freedesktop.machine1.Manager">
38 node /org/freedesktop/machine1 {
39 interface org.freedesktop.machine1.Manager {
45 GetMachineByPID(in u pid,
47 ListMachines(out a(ssso) machines);
48 ListImages(out a(ssbttto) images);
49 CreateMachine(in s name,
55 in a(sv) scope_properties,
57 CreateMachineWithNetwork(in s name,
64 in a(sv) scope_properties,
66 RegisterMachine(in s name,
73 RegisterMachineWithNetwork(in s name,
81 UnregisterMachine(in s name);
82 TerminateMachine(in s id);
83 KillMachine(in s name,
86 GetMachineAddresses(in s name,
87 out a(iay) addresses);
88 GetMachineOSRelease(in s name,
90 OpenMachinePTY(in s name,
93 OpenMachineLogin(in s name,
96 OpenMachineShell(in s name,
103 BindMountMachine(in s name,
108 CopyFromMachine(in s name,
111 CopyToMachine(in s name,
114 OpenMachineRootDirectory(in s name,
116 GetMachineUIDShift(in s name,
118 RemoveImage(in s name);
119 RenameImage(in s name,
121 CloneImage(in s name,
124 MarkImageReadOnly(in s name,
126 GetImageHostname(in s name,
128 GetImageMachineID(in s name,
130 GetImageMachineInfo(in s name,
131 out a{ss} machine_info);
132 GetImageOSRelease(in s name,
133 out a{ss} os_release);
134 SetPoolLimit(in t size);
135 SetImageLimit(in s name,
139 MapFromMachineUser(in s name,
142 MapToMachineUser(in u uid_outer,
146 MapFromMachineGroup(in s name,
149 MapToMachineGroup(in u gid_outer,
154 MachineNew(s machine,
156 MachineRemoved(s machine,
159 @org.freedesktop.DBus.Property.EmitsChangedSignal(
"false")
160 readonly s PoolPath = '...';
161 @org.freedesktop.DBus.Property.EmitsChangedSignal(
"false")
162 readonly t PoolUsage = ...;
163 @org.freedesktop.DBus.Property.EmitsChangedSignal(
"false")
164 readonly t PoolLimit = ...;
166 interface org.freedesktop.DBus.Peer { ... };
167 interface org.freedesktop.DBus.Introspectable { ... };
168 interface org.freedesktop.DBus.Properties { ... };
172 <!--method UnregisterMachine is not documented!-->
174 <!--method OpenMachineRootDirectory is not documented!-->
176 <!--method GetMachineUIDShift is not documented!-->
178 <!--method GetImageHostname is not documented!-->
180 <!--method GetImageMachineID is not documented!-->
182 <!--method GetImageMachineInfo is not documented!-->
184 <!--method GetImageOSRelease is not documented!-->
186 <!--method CleanPool is not documented!-->
188 <!--Autogenerated cross-references for systemd.directives, do not edit-->
190 <variablelist class=
"dbus-interface" generated=
"True" extra-ref=
"org.freedesktop.machine1.Manager"/>
192 <variablelist class=
"dbus-interface" generated=
"True" extra-ref=
"org.freedesktop.machine1.Manager"/>
194 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"GetMachine()"/>
196 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"GetImage()"/>
198 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"GetMachineByPID()"/>
200 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"ListMachines()"/>
202 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"ListImages()"/>
204 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"CreateMachine()"/>
206 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"CreateMachineWithNetwork()"/>
208 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"RegisterMachine()"/>
210 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"RegisterMachineWithNetwork()"/>
212 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"UnregisterMachine()"/>
214 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"TerminateMachine()"/>
216 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"KillMachine()"/>
218 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"GetMachineAddresses()"/>
220 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"GetMachineOSRelease()"/>
222 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"OpenMachinePTY()"/>
224 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"OpenMachineLogin()"/>
226 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"OpenMachineShell()"/>
228 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"BindMountMachine()"/>
230 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"CopyFromMachine()"/>
232 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"CopyToMachine()"/>
234 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"OpenMachineRootDirectory()"/>
236 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"GetMachineUIDShift()"/>
238 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"RemoveImage()"/>
240 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"RenameImage()"/>
242 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"CloneImage()"/>
244 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"MarkImageReadOnly()"/>
246 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"GetImageHostname()"/>
248 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"GetImageMachineID()"/>
250 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"GetImageMachineInfo()"/>
252 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"GetImageOSRelease()"/>
254 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"SetPoolLimit()"/>
256 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"SetImageLimit()"/>
258 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"CleanPool()"/>
260 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"MapFromMachineUser()"/>
262 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"MapToMachineUser()"/>
264 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"MapFromMachineGroup()"/>
266 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"MapToMachineGroup()"/>
268 <variablelist class=
"dbus-signal" generated=
"True" extra-ref=
"MachineNew"/>
270 <variablelist class=
"dbus-signal" generated=
"True" extra-ref=
"MachineRemoved"/>
272 <variablelist class=
"dbus-property" generated=
"True" extra-ref=
"PoolPath"/>
274 <variablelist class=
"dbus-property" generated=
"True" extra-ref=
"PoolUsage"/>
276 <variablelist class=
"dbus-property" generated=
"True" extra-ref=
"PoolLimit"/>
278 <!--End of Autogenerated section-->
281 <title>Methods
</title>
283 <para><function>GetMachine()
</function> may be used to get the machine object path for the machine with
284 the specified name. Similarly,
<function>GetMachineByPID()
</function> gets the machine object the
285 specified PID belongs to if there is any.
</para>
287 <para><function>GetImage()
</function> may be used to get the image object path of the image with the
288 specified name.
</para>
290 <para><function>ListMachines()
</function> returns an array of all currently registered machines. The
291 structures in the array consist of the following fields: machine name, machine class, an identifier for
292 the service that registered the machine and the machine object path.
</para>
294 <para><function>ListImages()
</function> returns an array of all currently known images. The
295 structures in the array consist of the following fields: image name, type, read-only flag, creation
296 time, modification time, current disk space, and image object path.
</para>
298 <para><function>CreateMachine()
</function> may be used to register a new virtual machine or container
299 with
<command>systemd-machined
</command>, creating a scope unit for it. It accepts the following arguments: a
300 machine name chosen by the registrar, an optional UUID as a
32 byte array, a string that identifies the
301 service that registers the machine, a class string, the PID of the leader process of the machine, an
302 optional root directory of the container, and an array of additional properties to use for the scope
303 registration. The virtual machine name must be suitable as a hostname, and hence should follow the usual
304 DNS hostname rules, as well as the Linux hostname restrictions. Specifically, only
7 bit ASCII is
305 permitted, a maximum length of
64 characters is enforced, only characters from the set
306 <literal>a-zA-Z0-
9-_.
</literal> are allowed, the name may not begin with a dot, and it may not contain
307 two dots immediately following each other. Container and VM managers should ideally use the hostname
308 used internally in the machine for this parameter. This recommendation is made in order to make the
309 machine name naturally resolvable using
310 <citerefentry><refentrytitle>nss-mymachines
</refentrytitle><manvolnum>8</manvolnum></citerefentry>. If
311 a container manager needs to embed characters outside of the indicated range, escaping is required,
312 possibly using
<literal>_
</literal> as the escape character. Another (somewhat natural) option would be
313 to utilize Internet IDNA encoding. The UUID is passed as a
32 byte array or, if no suitable UUID is
314 available, an empty array (zero length) or zeroed out array shall be passed. The UUID should identify
315 the virtual machine/container uniquely and should ideally be the same UUID that
316 <filename>/etc/machine-id
</filename> in the VM/container is initialized from. The service string can be
317 free-form, but it is recommended to pass a short lowercase identifier like
318 <literal>systemd-nspawn
</literal>,
<literal>libvirt-lxc
</literal> or similar. The class string should
319 be either
<literal>container
</literal> or
<literal>vm
</literal> indicating whether the machine to
320 register is of the respective class. The leader PID should be the host PID of the init process of the
321 container or the encapsulating process of the VM. If the root directory of the container is known and
322 available in the host's hierarchy, it should be passed. Otherwise, pass the empty string instead. Finally, the
323 scope properties are passed as array in the same way as to PID1's
324 <function>StartTransientUnit()
</function> method. Calling this method will internally register a transient scope
325 unit for the calling client (utilizing the passed scope_properties) and move the leader PID into
326 it. The method returns an object path for the registered machine object that implements the
327 <interfacename>org.freedesktop.machine1.Machine
</interfacename> interface (see below). Also see the
328 <ulink url=
"https://www.freedesktop.org/wiki/Software/systemd/ControlGroupInterface/">New Control Group
329 Interfaces
</ulink> for details about scope units and how to alter resource control settings on the
330 created machine at runtime.
</para>
332 <para><function>RegisterMachine()
</function> is similar to
<function>CreateMachine()
</function>.
333 However, it only registers a machine and does not create a scope unit for it. Instead, the caller's unit is
334 registered. We recommend to only use this method for container or VM managers that are run
335 multiple times, one instance for each container/VM they manage, and are invoked as system
338 <para><function>CreateMachineWithNetwork()
</function> and
339 <function>RegisterMachineWithNetwork()
</function> are similar to
<function>CreateMachine()
</function>
340 and
<function>RegisterMachine()
</function> but take an extra argument: an array of network interface
341 indices that point towards the virtual machine or container. The interface indices should reference one
342 or more network interfaces on the host that can be used to communicate with the guest. Commonly, the
343 passed interface index refers to the host side of a
"veth" link (in case of containers), a
344 "tun"/
"tap" link (in case of VMs), or the host side of a bridge interface that bridges access to the
345 VM/container interfaces. Specifying this information is useful to enable support for link-local IPv6
346 communication to the machines since the scope field of sockaddr_in6 can be initialized by the
348 <citerefentry><refentrytitle>nss-mymachines
</refentrytitle><manvolnum>8</manvolnum></citerefentry>
349 makes use of this information.
</para>
351 <para><function>KillMachine()
</function> sends a UNIX signal to the machine's processes. As its arguments, it takes a
352 machine name (as originally passed to
<function>CreateMachine()
</function> or returned by
353 <function>ListMachines()
</function>), an identifier that specifies what precisely to send the signal to (either
354 <literal>leader
</literal> or
<literal>all
</literal>), and a numeric UNIX signal integer.
</para>
356 <para><function>TerminateMachine()
</function> terminates a virtual machine, killing its processes. It
357 takes a machine name as its only argument.
</para>
359 <para><function>GetMachineAddresses()
</function> retrieves the IP addresses of a container. This method
360 returns an array of pairs consisting of an address family specifier (
<constant>AF_INET
</constant> or
361 <constant>AF_INET6
</constant>) and a byte array containing the addresses. This is only supported for
362 containers that make use of network namespacing.
</para>
364 <para><function>GetMachineOSRelease()
</function> retrieves the OS release information of a
365 container. This method returns an array of key value pairs read from the
366 <citerefentry><refentrytitle>os-release
</refentrytitle><manvolnum>5</manvolnum></citerefentry> file in
367 the container and is useful to identify the operating system used in a container.
</para>
369 <para><function>OpenMachinePTY()
</function> allocates a pseudo TTY in the container and returns a file
370 descriptor and its path. This is equivalent to transitioning into the container and invoking
371 <citerefentry><refentrytitle>posix_openpt
</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
</para>
373 <para><function>OpenMachineLogin()
</function> allocates a pseudo TTY in the container and ensures that
374 a getty login prompt of the container is running on the other end. It returns the file descriptor of
375 the PTY and the PTY path. This is useful for acquiring a pty with a login prompt from the
378 <para><function>OpenMachineShell()
</function> allocates a pseudo TTY in the container, as the specified
379 user, and invokes the executable at the specified path with a list of arguments (starting from
380 argv[
0]) and an environment block. It then returns the file descriptor of the PTY and the PTY
383 <para><function>BindMountMachine()
</function> bind mounts a file or directory from the host into the
384 container. Its arguments consist of a machine name, the source directory on the host, the destination directory in the
385 container, and two booleans, one indicating whether the bind mount shall be
386 read-only, the other indicating whether the destination mount point shall be created first, if it is
389 <para><function>CopyFromMachine()
</function> copies files or directories from a container into the
390 host. It takes a container name, a source directory in the container and a destination directory on the
391 host as arguments.
<function>CopyToMachine()
</function> does the opposite and copies files from a source
392 directory on the host into a destination directory in the container.
</para>
394 <para><function>RemoveImage()
</function> removes the image with the specified name.
</para>
396 <para><function>RenameImage()
</function> renames the specified image.
</para>
398 <para><function>CloneImage()
</function> clones the specified image under a new name. It also takes a
399 boolean argument indicating whether the resulting image shall be read-only or not.
</para>
401 <para><function>MarkImageReadOnly()
</function> toggles the read-only flag of an image.
</para>
403 <para><function>SetPoolLimit()
</function> sets an overall quota limit on the pool of images.
</para>
405 <para><function>SetImageLimit()
</function> sets a per-image quota limit.
</para>
407 <para><function>MapFromMachineUser()
</function>,
<function>MapToMachineUser()
</function>,
408 <function>MapFromMachineGroup()
</function>, and
<function>MapToMachineGroup()
</function> may be used to map
409 UIDs/GIDs from the host user namespace to a container user namespace or vice versa.
</para>
413 <title>Signals
</title>
415 <para><function>MachineNew
</function> and
<function>MachineRemoved
</function> are sent whenever a new
416 machine is registered or removed. These signals carry the machine name and the object path to the corresponding
417 <interfacename>org.freedesktop.machine1.Machine
</interfacename> interface (see below).
</para>
421 <title>Properties
</title>
423 <para><varname>PoolPath
</varname> specifies the file system path where images are written to.
</para>
425 <para><varname>PoolUsage
</varname> specifies the current usage size of the image pool in bytes.
</para>
427 <para><varname>PoolLimit
</varname> specifies the size limit of the image pool in bytes.
</para>
432 <title>Machine Objects
</title>
434 <programlisting executable=
"systemd-machined" node=
"/org/freedesktop/machine1/machine/rawhide" interface=
"org.freedesktop.machine1.Machine">
435 node /org/freedesktop/machine1/machine/rawhide {
436 interface org.freedesktop.machine1.Machine {
441 GetAddresses(out a(iay) addresses);
442 GetOSRelease(out a{ss} fields);
443 GetUIDShift(out u shift);
454 BindMount(in s source,
458 CopyFrom(in s source,
462 OpenRootDirectory(out h fd);
464 @org.freedesktop.DBus.Property.EmitsChangedSignal(
"const")
465 readonly s Name = '...';
466 @org.freedesktop.DBus.Property.EmitsChangedSignal(
"const")
467 readonly ay Id = [...];
468 @org.freedesktop.DBus.Property.EmitsChangedSignal(
"const")
469 readonly t Timestamp = ...;
470 @org.freedesktop.DBus.Property.EmitsChangedSignal(
"const")
471 readonly t TimestampMonotonic = ...;
472 @org.freedesktop.DBus.Property.EmitsChangedSignal(
"const")
473 readonly s Service = '...';
474 @org.freedesktop.DBus.Property.EmitsChangedSignal(
"const")
475 readonly s Unit = '...';
476 @org.freedesktop.DBus.Property.EmitsChangedSignal(
"const")
477 readonly u Leader = ...;
478 @org.freedesktop.DBus.Property.EmitsChangedSignal(
"const")
479 readonly s Class = '...';
480 @org.freedesktop.DBus.Property.EmitsChangedSignal(
"const")
481 readonly s RootDirectory = '...';
482 @org.freedesktop.DBus.Property.EmitsChangedSignal(
"const")
483 readonly ai NetworkInterfaces = [...];
484 @org.freedesktop.DBus.Property.EmitsChangedSignal(
"false")
485 readonly s State = '...';
487 interface org.freedesktop.DBus.Peer { ... };
488 interface org.freedesktop.DBus.Introspectable { ... };
489 interface org.freedesktop.DBus.Properties { ... };
493 <!--method GetUIDShift is not documented!-->
495 <!--method OpenPTY is not documented!-->
497 <!--method OpenLogin is not documented!-->
499 <!--method OpenShell is not documented!-->
501 <!--method BindMount is not documented!-->
503 <!--method CopyFrom is not documented!-->
505 <!--method CopyTo is not documented!-->
507 <!--method OpenRootDirectory is not documented!-->
509 <!--Autogenerated cross-references for systemd.directives, do not edit-->
511 <variablelist class=
"dbus-interface" generated=
"True" extra-ref=
"org.freedesktop.machine1.Machine"/>
513 <variablelist class=
"dbus-interface" generated=
"True" extra-ref=
"org.freedesktop.machine1.Machine"/>
515 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"Terminate()"/>
517 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"Kill()"/>
519 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"GetAddresses()"/>
521 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"GetOSRelease()"/>
523 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"GetUIDShift()"/>
525 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"OpenPTY()"/>
527 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"OpenLogin()"/>
529 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"OpenShell()"/>
531 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"BindMount()"/>
533 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"CopyFrom()"/>
535 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"CopyTo()"/>
537 <variablelist class=
"dbus-method" generated=
"True" extra-ref=
"OpenRootDirectory()"/>
539 <variablelist class=
"dbus-property" generated=
"True" extra-ref=
"Name"/>
541 <variablelist class=
"dbus-property" generated=
"True" extra-ref=
"Id"/>
543 <variablelist class=
"dbus-property" generated=
"True" extra-ref=
"Timestamp"/>
545 <variablelist class=
"dbus-property" generated=
"True" extra-ref=
"TimestampMonotonic"/>
547 <variablelist class=
"dbus-property" generated=
"True" extra-ref=
"Service"/>
549 <variablelist class=
"dbus-property" generated=
"True" extra-ref=
"Unit"/>
551 <variablelist class=
"dbus-property" generated=
"True" extra-ref=
"Leader"/>
553 <variablelist class=
"dbus-property" generated=
"True" extra-ref=
"Class"/>
555 <variablelist class=
"dbus-property" generated=
"True" extra-ref=
"RootDirectory"/>
557 <variablelist class=
"dbus-property" generated=
"True" extra-ref=
"NetworkInterfaces"/>
559 <variablelist class=
"dbus-property" generated=
"True" extra-ref=
"State"/>
561 <!--End of Autogenerated section-->
564 <title>Methods
</title>
566 <para><function>Terminate()
</function> and
<function>Kill()
</function> terminate/kill the machine. These methods
567 take the same arguments as
<function>TerminateMachine()
</function> and
568 <function>KillMachine()
</function> on the Manager interface, respectively.
</para>
570 <para><function>GetAddresses()
</function> and
<function>GetOSRelease()
</function> get the IP address and OS
571 release information from the machine. These methods take the same arguments as
572 <function>GetMachineAddresses()
</function> and
<function>GetMachineOSRelease()
</function> of the
573 Manager interface, respectively.
</para>
577 <title>Properties
</title>
579 <para><varname>Name
</varname> is the machine name as it was passed in during registration with
580 <function>CreateMachine()
</function> on the manager object.
</para>
582 <para><varname>Id
</varname> is the machine UUID.
</para>
584 <para><varname>Timestamp
</varname> and
<varname>TimestampMonotonic
</varname> are the realtime and
585 monotonic timestamps when the virtual machines where created in microseconds since the epoch.
</para>
587 <para><varname>Service
</varname> contains a short string identifying the registering service as passed
588 in during registration of the machine.
</para>
590 <para><varname>Unit
</varname> is the systemd scope or service unit name for the machine.
</para>
592 <para><varname>Leader
</varname> is the PID of the leader process of the machine.
</para>
594 <para><varname>Class
</varname> is the class of the machine and is either the string
"vm" (for real VMs
595 based on virtualized hardware) or
"container" (for light-weight userspace virtualization sharing the
596 same kernel as the host).
</para>
598 <para><varname>RootDirectory
</varname> is the root directory of the container if it is known and
599 applicable or the empty string.
</para>
601 <para><varname>NetworkInterfaces
</varname> contains an array of network interface indices that point
602 towards the container, the VM or the host. For details about this information see the description of
603 <function>CreateMachineWithNetwork()
</function> above.
</para>
605 <para><varname>State
</varname> is the state of the machine and is one of
<literal>opening
</literal>,
606 <literal>running
</literal>, or
<literal>closing
</literal>. Note that the state machine is not considered
607 part of the API and states might be removed or added without this being considered API breakage.
613 <title>Examples
</title>
616 <title>Introspect
<interfacename>org.freedesktop.machine1.Manager
</interfacename> on the bus
</title>
619 $ gdbus introspect --system \
620 --dest org.freedesktop.machine1 \
621 --object-path /org/freedesktop/machine1
626 <title>Introspect
<interfacename>org.freedesktop.machine1.Machine
</interfacename> on the bus
</title>
629 $ gdbus introspect --system \
630 --dest org.freedesktop.machine1 \
631 --object-path /org/freedesktop/machine1/machine/rawhide
637 <title>Versioning
</title>
639 <para>These D-Bus interfaces follow
<ulink url=
"http://0pointer.de/blog/projects/versioning-dbus.html">
640 the usual interface versioning guidelines
</ulink>.
</para>