diff options
Diffstat (limited to 'usr.sbin/autofs/auto_master.5')
| -rw-r--r-- | usr.sbin/autofs/auto_master.5 | 272 |
1 files changed, 272 insertions, 0 deletions
diff --git a/usr.sbin/autofs/auto_master.5 b/usr.sbin/autofs/auto_master.5 new file mode 100644 index 0000000..f923f4f --- /dev/null +++ b/usr.sbin/autofs/auto_master.5 @@ -0,0 +1,272 @@ +.\" Copyright (c) 2014 The FreeBSD Foundation +.\" All rights reserved. +.\" +.\" This software was developed by Edward Tomasz Napierala under sponsorship +.\" from the FreeBSD Foundation. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" $FreeBSD$ +.\" +.Dd July 31, 2014 +.Dt AUTO_MASTER 5 +.Os +.Sh NAME +.Nm auto_master +.Nd auto_master and map file format +.Sh DESCRIPTION +The +.Nm +configuration file is used by the +.Xr automount 8 +command. +Map files are read by the +.Xr automountd 8 +daemon. +.Sh AUTO_MASTER SYNTAX +The +.Nm +file consists of lines with two or three entries separated by whitespace +and terminated by newline character: +.Bd -literal -offset indent +.Pa mountpoint Pa map_name Op Ar -options +.Ed +.Pp +.Pa mountpoint +is either a fully specified path, or +.Li /- . +When +.Pa mountpoint +is a full path, +.Pa map_name +must reference an indirect map. +Otherwise, +.Pa map_name +must reference a direct map. +See +.Sx "MAP SYNTAX" below. +.Pp +.Pa map_name +specifies map to use. +If +.Pa map_name +begins with +.Li - , +it specifies a special map. +See +.Sx "MAP SYNTAX" +below. +If +.Pa map_name +is not a fully specified path +.Pq it does not start with Li / , +.Xr automountd 8 +will search for that name in +.Li /etc . +Otherwise it will use the path as given. +If the file indicated by +.Pa map_name +is executable, +.Xr automountd 8 +will assume it is an executable map. +See +.Sx "MAP SYNTAX" +below. +Otherwise, the file is opened and the contents parsed. +.Pp +.Pa -options +is an optional field that starts with +.Li - +and can contain generic filesystem mount options. +.Pp +The following example specifies that the /etc/auto_example indirect map +will be mounted on /example. +.Bd -literal -offset indent +/example auto_example +.Ed +.Sh MAP SYNTAX +Map files consist of lines with a number of entries separated by whitespace +and terminated by newline character: +.Bd -literal -offset indent +.Pa key Oo Ar -options Oc Oo Ar mountpoint Oo -options Oc Oc Ar location Op ... +.Ed +.Pp +In most cases, it can be simplified to: +.Bd -literal -offset indent +.Pa key Oo Ar -options Oc Ar location +.Ed +.Pp +.Pa key +is the path component used by +.Xr automountd 8 +to find the right map entry to use. +It is also used to form the final mountpoint. +.Pp +The +.Ar options +field, if present, must begin with +.Li - . +When mounting the filesystem, options supplied to +.Nm +and options specified in the map entry are concatenated together. +The special option +.Li fstype +is used to specify filesystem type. +It is not passed to the mount program as an option. +Instead, it is passed as argument to +.Cm "mount -t". +.Pp +The optional +.Pa mountpoint +field is used to specify multiple mount points +for a single key. +.Pp +The +.Ar location +field specifies the filesystem to be mounted. +To pass location that begins with +.Li / , +prefix it with colon. +For example, +.Li :/dev/cd0 . +.Pp +This example, when used with the +.Nm +example above, specifies that the NFS share +.Li 192.168.1.1:/share/example/x +will be mounted on +.Pa /example/x/ +when any process attempts to access that mountpoint, with +.Li intr +and +.Li nfsv4 +mount options: +.Bd -literal -offset indent +.Li x -intr,nfsv4 192.168.1.1:/share/example/x +.Ed +.Pp +Automatically mount the CD drive on access: +.Bd -literal -offset indent +.Li cd -intr,fstype=cd9660 :/dev/cd0 +.Ed +.Sh SPECIAL MAPS +Special maps have names beginning with +.Li - . +Supported special maps are: +.Pp +.Bl -tag -width "-hosts" -compact +.It Li -hosts +This map queries the remote NFS server and maps exported volumes. +It is traditionally mounted on +.Pa /net . +It enables access to files on a remote NFS server by accessing +.Pa /net/nfs-server-ip/share-name/ +directory, without the need for any further configuration. +.It Li -null +This map prevents the +.Xr automountd 8 +from mounting anything on the mountpoint. +.El +.Sh EXECUTABLE MAPS +If the map file specified in +.Nm +has execute bit set, the +.Xr automountd 8 +will execute it and parse the standard output instead of parsing +the file contents. +.Sh INDIRECT VERSUS DIRECT MAPS +Indirect maps are referred to in +.Nm +by entries with a fully qualified path as a mount point, and must contain only +relative paths as keys. +Direct maps are referred to in +.Nm +by entries with +.Li /- +as the mountpoint, and must contain only fully qualified paths as keys. +For indirect maps, the final mount point is determined by concatenating the +.Nm +mountpoint with the map entry key and optional map entry mountpoint. +For direct maps, the final mount point is determined by concatenating +the map entry key with the optional map entry mountpoint. +.Pp +The example above could be rewritten using direct map, by placing this in +.Nm : +.Bd -literal -offset indent +.Li /- auto_example +.Ed +.Pp +and this in +.Li /etc/auto_example +map file: +.Bd -literal -offset indent +.Li /example/x -intr,nfsv4 192.168.1.1:/share/example/x +.Li /example/cd -intr,fstype=cd9660 :/dev/cd0 +.Ed +.Sh DIRECTORY SERVICES +Both +.Nm +and maps may contain entries consisting of a plus sign and map name: +.Bd -literal -offset indent +.Li +auto_master +.Ed +.Pp +Those entries cause +.Xr automountd 8 +daemon to retrieve the named map from directory services (like LDAP) +and include it where the entry was. +.Pp +If the file containing the map referenced in +.Nm +is not found, the map will be retrieved from directory services instead. +.Pp +To retrieve entries from directory services, +.Xr automountd 8 +daemon runs +.Pa /etc/autofs/include , +which is usually a shell script, with map name as the only command line +parameter. +The script should output entries formatted according to +.Nm +or automounter map syntax to standard output. +An example script to use LDAP is included in +.Pa /etc/autofs/include_ldap . +It can be symlinked to +.Pa /etc/autofs/include . +.Sh FILES +.Bl -tag -width ".Pa /etc/auto_master" -compact +.It Pa /etc/auto_master +The default location of the +.Pa auto_master +file. +.El +.Sh SEE ALSO +.Xr autofs 5 , +.Xr automount 8 , +.Xr automountd 8 , +.Xr autounmountd 8 +.Sh AUTHORS +The +.Nm +configuration file functionality was developed by +.An Edward Tomasz Napierala Aq Mt trasz@FreeBSD.org +under sponsorship from the FreeBSD Foundation. |
