xref: /dragonfly/usr.sbin/autofs/auto_master.5 (revision 62dc643e)
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30.\"
31.Dd April 14, 2016
32.Dt AUTO_MASTER 5
33.Os
34.Sh NAME
35.Nm auto_master
36.Nd auto_master and map file format
37.Sh DESCRIPTION
38The automounter configuration consists of the
39.Nm
40configuration file, which assigns filesystem paths to map names,
41and maps, which contain actual mount information.
42The
43.Nm
44configuration file is used by the
45.Xr automount 8
46command.
47Map files are read by the
48.Xr automountd 8
49daemon.
50.Sh AUTO_MASTER SYNTAX
51The
52.Nm
53file consists of lines with two or three entries separated by whitespace
54and terminated by newline character:
55.Bd -literal -offset indent
56.Pa mountpoint Pa map_name Op Ar -options
57.Ed
58.Pp
59.Pa mountpoint
60is either a fully specified path, or
61.Li /- .
62When
63.Pa mountpoint
64is a full path,
65.Pa map_name
66must reference an indirect map.
67Otherwise,
68.Pa map_name
69must reference a direct map.
70See
71.Sx "MAP SYNTAX"
72below.
73.Pp
74.Pa map_name
75specifies map to use.
76If
77.Pa map_name
78begins with
79.Li - ,
80it specifies a special map.
81See
82.Sx "MAP SYNTAX"
83below.
84If
85.Pa map_name
86is not a fully specified path
87.Pq it does not start with Li / ,
88.Xr automountd 8
89will search for that name in
90.Li /etc .
91Otherwise it will use the path as given.
92If the file indicated by
93.Pa map_name
94is executable,
95.Xr automountd 8
96will assume it is an executable map.
97See
98.Sx "MAP SYNTAX"
99below.
100Otherwise, the file is opened and the contents parsed.
101.Pp
102.Pa -options
103is an optional field that starts with
104.Li -
105and can contain generic filesystem mount options.
106.Pp
107The following example specifies that the /etc/auto_example indirect map
108will be mounted on /example.
109.Bd -literal -offset indent
110/example auto_example
111.Ed
112.Sh MAP SYNTAX
113Map files consist of lines with a number of entries separated by whitespace
114and terminated by newline character:
115.Bd -literal -offset indent
116.Pa key Oo Ar -options Oc Oo Ar mountpoint Oo -options Oc Oc Ar location Op ...
117.Ed
118.Pp
119In most cases, it can be simplified to:
120.Bd -literal -offset indent
121.Pa key Oo Ar -options Oc Ar location
122.Ed
123.Pp
124.Pa key
125is the path component used by
126.Xr automountd 8
127to find the right map entry to use.
128It is also used to form the final mountpoint.
129A wildcard
130.Pq Ql *
131can be used for the key.
132It matches every directory that does not match other keys.
133Those directories will not be visible to the user
134until accessed.
135.Pp
136The
137.Ar options
138field, if present, must begin with
139.Li - .
140When mounting the filesystem, options supplied to
141.Nm
142and options specified in the map entry are concatenated together.
143The special option
144.Li fstype
145is used to specify filesystem type.
146It is not passed to the mount program as an option.
147Instead, it is passed as an argument to
148.Cm "mount -t".
149The default
150.Li fstype
151is
152.Ql nfs .
153The special option
154.Li nobrowse
155is used to disable creation of top-level directories for special
156and executable maps.
157.Pp
158The optional
159.Pa mountpoint
160field is used to specify multiple mount points
161for a single key.
162.Pp
163The
164.Ar location
165field specifies the filesystem to be mounted.
166Ampersands
167.Pq Ql &
168in the
169.Ar location
170field are replaced with the value of
171.Ar key .
172This is typically used with wildcards, like:
173.Bd -literal -offset indent
174.Li *	192.168.1.1:/share/&
175.Ed
176.Pp
177The
178.Ar location
179field may contain references to variables, like:
180.Bd -literal -offset indent
181.Li sys	192.168.1.1:/sys/${OSNAME}
182.Ed
183.Pp
184Defined variables are:
185.Pp
186.Bl -tag -width "-OSNAME" -compact
187.It Li ARCH
188Expands to the output of
189.Li "uname -p" .
190.It Li CPU
191Same as ARCH.
192.It Li HOST
193Expands to the output of
194.Li "uname -n" .
195.It Li OSNAME
196Expands to the output of
197.Li "uname -s" .
198.It Li OSREL
199Expands to the output of
200.Li "uname -r" .
201.It Li OSVERS
202Expands to the output of
203.Li "uname -v" .
204.El
205.Pp
206Additional variables can be defined with the
207.Fl D
208option of
209.Xr automount 8
210and
211.Xr automountd 8 .
212.Pp
213To pass a location that begins with
214.Li / ,
215prefix it with a colon.
216For example,
217.Li :/dev/cd0 .
218.Pp
219This example, when put into
220.Pa /etc/auto_example ,
221and with
222.Nm
223referring to the map as described above, specifies that the NFS share
224.Li 192.168.1.1:/share/example/x
225will be mounted on
226.Pa /example/x/
227when any process attempts to access that mountpoint, with
228.Li intr
229and
230.Li nfsv4
231mount options, described in
232.Xr mount_nfs 8 :
233.Bd -literal -offset indent
234.Li x -intr,nfsv4 192.168.1.1:/share/example/x
235.Ed
236.Pp
237Automatically mount an SMB share on access, as a guest user,
238without prompting for a password:
239.Bd -literal -offset indent
240.Li share -fstype=smbfs,-N ://@server/share
241.Ed
242.Pp
243Automatically mount the CD drive on access:
244.Bd -literal -offset indent
245.Li cd -fstype=cd9660 :/dev/cd0
246.Ed
247.Sh SPECIAL MAPS
248Special maps have names beginning with
249.Li - .
250Supported special maps are:
251.Pp
252.Bl -tag -width "-hosts" -compact
253.It Li -hosts
254Query the remote NFS server and map exported shares.
255This map is traditionally mounted on
256.Pa /net .
257Access to files on a remote NFS server is provided through the
258.Pf /net/ Ar nfs-server-ip Ns / Ns Ar share-name Ns/
259directory without any additional configuration.
260Directories for individual NFS servers are not present until the first access,
261when they are automatically created.
262.It Li -media
263Query devices that are not yet mounted, but contain valid filesystems.
264Generally used to access files on removable media.
265.It Li -noauto
266Mount filesystems configured in
267.Xr fstab 5
268as "noauto".
269This needs to be set up as a direct map.
270.It Li -null
271Prevent
272.Xr automountd 8
273from mounting anything on the mountpoint.
274.El
275.Pp
276It is possible to add custom special maps by adding them, as executable
277maps named
278.Pa special_foo ,
279to the
280.Pa /etc/autofs/
281directory.
282.Sh EXECUTABLE MAPS
283If the map file specified in
284.Nm
285has the execute bit set,
286.Xr automountd 8
287will execute it and parse the standard output instead of parsing
288the file contents.
289When called without command line arguments, the executable is
290expected to output a list of available map keys separated by
291newline characters.
292Otherwise, the executable will be called with a key name as
293a command line argument.
294Output from the executable is expected to be the entry for that key,
295not including the key itself.
296.Sh INDIRECT VERSUS DIRECT MAPS
297Indirect maps are referred to in
298.Nm
299by entries with a fully qualified path as a mount point, and must contain only
300relative paths as keys.
301Direct maps are referred to in
302.Nm
303by entries with
304.Li /-
305as the mountpoint, and must contain only fully qualified paths as keys.
306For indirect maps, the final mount point is determined by concatenating the
307.Nm
308mountpoint with the map entry key and optional map entry mountpoint.
309For direct maps, the final mount point is determined by concatenating
310the map entry key with the optional map entry mountpoint.
311.Pp
312The example above could be rewritten using direct map, by placing this in
313.Nm :
314.Bd -literal -offset indent
315.Li /- auto_example
316.Ed
317.Pp
318and this in
319.Li /etc/auto_example
320map file:
321.Bd -literal -offset indent
322.Li /example/x -intr,nfsv4 192.168.1.1:/share/example/x
323.Li /example/share -fstype=smbfs,-N ://@server/share
324.Li /example/cd -fstype=cd9660 :/dev/cd0
325.Ed
326.Sh DIRECTORY SERVICES
327Both
328.Nm
329and maps may contain entries consisting of a plus sign and map name:
330.Bd -literal -offset indent
331.Li +auto_master
332.Ed
333.Pp
334Those entries cause
335.Xr automountd 8
336daemon to retrieve the named map from directory services (like LDAP)
337and include it where the entry was.
338.Pp
339If the file containing the map referenced in
340.Nm
341is not found, the map will be retrieved from directory services instead.
342.Pp
343To retrieve entries from directory services,
344.Xr automountd 8
345daemon runs
346.Pa /etc/autofs/include ,
347which is usually a shell script, with map name as the only command line
348parameter.
349The script should output entries formatted according to
350.Nm
351or automounter map syntax to standard output.
352An example script to use LDAP is included in
353.Pa /etc/autofs/include_ldap .
354It can be symlinked to
355.Pa /etc/autofs/include .
356.Sh FILES
357.Bl -tag -width ".Pa /etc/auto_master" -compact
358.It Pa /etc/auto_master
359The default location of the
360.Pa auto_master
361file.
362.It Pa /etc/autofs/
363Directory containing shell scripts to implement special maps and directory
364services.
365.El
366.Sh SEE ALSO
367.Xr autofs 5 ,
368.Xr automount 8 ,
369.Xr automountd 8 ,
370.Xr autounmountd 8
371.Sh AUTHORS
372The
373.Nm
374configuration file functionality was developed by
375.An Edward Tomasz Napierala Aq Mt trasz@FreeBSD.org
376under sponsorship from the FreeBSD Foundation.
377.Pp
378The
379.Nm
380configuration file functionality was ported to
381.Dx
382by
383.An Tomohiro Kusumi Aq Mt kusumi.tomohiro@gmail.com .
384Donated to DragonFlyBSD by PeerCorps Trust Fund.
385.Sh BUGS
386.Pa /etc/autofs/special_media
387on
388.Dx
389currently can't detect HAMMER filesystem consists of more than one volumes.
390.Pp
391.Pa /etc/autofs/special_media
392on
393.Dx
394currently ignores md(4) devices by default.
395