Ubuntu Manpage: auto.master - Master Map for automounter

Provided by: autofs_5.0.7-3ubuntu3.2_amd64

NAME

       auto.master - Master Map for automounter

DESCRIPTION

The auto.master map is consulted to set up automount managed mount points when the autofs(8) script is
invoked or the automount(8) program is run. Each line describes a mount point and refers to an autofs map
describing file systems to be mounted under the mount point.

The default location of the master map is /etc/auto.master but an alternate name may be given on the com‐
mand line when running the automounter and the default master map may changed by setting the
MASTER_MAP_NAME configuration variable in /etc/default/autofs. If the master map name has no path then
the system Name Service Switch configuration will be consulted and each of the sources searched in line
with the rules given in the Name Service Switch configuration.

Access to mounts in maps is governed by a key.

For direct maps the mount point is always specified as:

and the key used within the direct map is the full path to the mount point.

For indirect maps access is by using the path scheme:

/mount-point/key

where mount-point is one of the entries listed in the master map. The key is a single directory component
and is matched against entries in the map given in the entry (See autofs(5)).

Additionally, a map may be included from its source as if it were itself present in the master map by in‐
cluding a line of the form: + [maptype,format:]map[options] and automount(8) will process the map accord‐
ing to the specification described below for map entries.

FORMAT

Master map entries have three fields separated by an arbitrary number of spaces or tabs. Lines beginning
with # are comments. The first field is the mount point described above and the second field is the name
of the map to be consulted for the mount point followed by the third field which contains options to be
applied to all entries in the map.

The format of a master map entry is:

mount-point [map-type[,format]:]map [options]

mount-point
Base location for the autofs filesystem to be mounted. For indirect maps this directory will be
created (as with mkdir -p) and is removed when the autofs filesystem is umounted.

map-type
Type of map used for this mount point. The following are valid map types:

file The map is a regular text file.

program
The map is an executable program, which is passed a key on the command line and returns an
entry (everything besides the key) on stdout if successful.

yp The map is a NIS (YP) database.

nisplus
The map is a NIS+ database.

hesiod The map is a hesiod database whose filsys entries are used for maps.

ldap or ldaps
The map is stored in an LDAP directory. If ldaps is used the appropriate certificate must
be configured in the LDAP client.

multi This map type allows the specification of multiple maps separated by "--". These maps are
searched in order to resolve key lookups.

dir This map type can be used at + master map including notation. The contents of files under
given directory are included to the master map. The name of file to be included must be
ended with ".autofs". A file will be ignored if its name is not ended with the suffix. In
addition a dot file, a file which name is started with "." is also ignored.

format Format of the map data; currently the only formats recognized are sun, which is a subset of the
Sun automounter map format, and hesiod, for hesiod filesys entries. If the format is left unspec‐
ified, it defaults to sun for all map types except hesiod.

map Name of the map to use. This is an absolute UNIX pathname for maps of types file, dir, or pro‐
gram, and the name of a database in the case for maps of type yp, nisplus, or hesiod or the dn of
an LDAP entry for maps of type ldap.

options
Any remaining command line arguments without leading dashes (-) are taken as options (-o) to
mount. Arguments with leading dashes are considered options for the maps.

The sun format supports the following options:

-Dvariable=value
Replace variable with value in map substitutions.

-strict
Treat errors when mounting file systems as fatal. This is important when multiple file sys‐
tems should be mounted (`multimounts'). If this option is given, no file system is mounted
at all if at least one file system can't be mounted.

nobind This is an autofs specific option that is a pseudo mount option and so is given without a
leading dash. It may be used either in the master map entry (so it effects all the map en‐
tries) or with individual map entries to prevent bind mounting of local NFS filesystems.
Bind mounting of NFS file systems can also be prevented for specific map entrys by adding
the "port=" mount option to the entries.

-r, --random-multimount-selection
Enables the use of ramdom selection when choosing a host from a list of replicated servers.
This option is applied to this mount only, overriding the global setting that may be speci‐
fied on the command line.

-w, --use-weight-only
Use only specified weights for server selection where more than one server is specified in
the map entry. If no server weights are given then each available server will be tried in
the order listed, within proximity.

-n, --negative-timeout <seconds>
Set the timeout for caching failed key lookups. This option can be used to override the
global default given either on the command line or in the configuration.

GENERAL SYSTEM DEFAULTS CONFIGURATION

The default value of several general settings may be changed in the configuration file
/etc/default/autofs. They are:

TIMEOUT
sets the default mount timeout (program default 600).

NEGATIVE_TIMEOUT
Set the default timeout for caching failed key lookups (program default 60). If the equivalent
command line option is given it will override this setting.

MOUNT_WAIT
Set the default time to wait for a response from a spawned mount(8) before sending it a SIGTERM.
Note that we still need to wait for the RPC layer to timeout before the sub-process exits so this
isn't ideal but it is the best we can do. The default is to wait until mount(8) returns without
intervention.

UMOUNT_WAIT
Set the default time to wait for a response from a spawned umount(8) before sending it a SIGTERM.
Note that we still need to wait for the RPC layer to timeout before the sub-process exits so this
isn't ideal but it is the best we can do.

BROWSE_MODE
Maps are browsable by default (program default "yes").

MOUNT_NFS_DEFAULT_PROTOCOL
Specify the default protocol used by mount.nfs(8) (program default 3). Since we can't identify
this default automatically we need to set it in the autofs configuration.

APPEND_OPTIONS
Determine whether global options, given on the command line or per mount in the master map, are
appended to map entry options or if the map entry options replace the global options (program de‐
fault "yes", append options).

LOGGING
set default log level "none", "verbose" or "debug" (program default "none").

BUILTIN MAP -hosts

       If  "-hosts"  is given as the map then accessing a key under the mount point which corresponds to a host‐
       name will allow access to the exports of that host. The hosts map cannot be dynamically updated  and  re‐
       quires a HUP signal to be sent to the daemon for it to check hosts for an update. Due to possible hierar‐
       chic  dependencies within a mount tree, it might not be completely updated during the HUP signal process‐
       ing.

       For example, with an entry in the master map of /net -hosts accessing /net/myserver  will  mount  exports
       from myserver on directories below /net/myserver.

       NOTE: mounts done from a hosts map will be mounted with the "nosuid,nodev,intr" options unless overridden
       by explicily specifying the "suid", "dev" or "nointr" options in the master map entry.

LDAP MAPS

If the map type ldap is specified the mapname is of the form [//servername/]dn, where the optional
servername is the name of the LDAP server to query, and dn is the Distinguished Name of a subtree to
search for map entries. The old style ldap:servername:mapname is also understood. Alternatively, the
type can be obtained from the Name Service Switch configuration, in which case the map name alone must be
given.

If no schema is set in the autofs configuration then autofs will check each of the commonly used schema
for a valid entry and if one is found it will used for subsequent lookups.

There are three common schemas in use:

nisMap Entries in the nisMap schema are nisObject objects in the specified subtree, where the cn at‐
tribute is the key (the wildcard key is "/"), and the nisMapEntry attribute contains the informa‐
tion used by the automounter.

automountMap
The automountMap schema has two variations that differ in the attribute used for the map key. En‐
tries in the automountMap schema are automount objects in the specified subtree, where the cn or
automountKey attribute (depending on local usage) is the key (the wildcard key is "/"), and the
automountInformation attribute contains the information used by the automounter. Note that the cn
attribute is case insensitive.

The object classes and attributes used for accessing automount maps in LDAP can be changed by setting en‐
tries in the autofs configuration located in /etc/default/autofs.

NOTE: If a schema is given in the configuration then all the schema configuration values must be set,
any partial schema specification will be ignored.

The configuration settings available are:

LDAP_TIMEOUT
Set the network response timeout (default 8). Set timeout value for the synchronous API calls.
The default is the LDAP library default of an infinite timeout.

LDAP_NETWORK_TIMEOUT
Set the network response timeout (default 8).

LDAP_URI
A space separated list of server uris of the form <proto>://<server>[/] where <proto> can be ldap
or ldaps. The option can be given multiple times. Map entries that include a server name override
this option and it is then not used. Default is an empty list in which case either the server giv‐
en in a map entry or the LDAP configured default is used. This uri list is read at startup and
whenever the daemon receives a HUP signal.

This configuration option can also be used to request autofs lookup SRV RRs for a domain of the form
<proto>:///[<domain dn>]. Note that a trailing "/" is not allowed when using this form. If the domain dn
is not specified the dns domain name (if any) is used to construct the domain dn for the SRV RR lookup.
The server list returned from an SRV RR lookup is refreshed according to the minimum ttl found in the SRV
RR records or after one hour, whichever is less.

SEARCH_BASE
The base dn to use when searching for amap base dn. This entry may be given multiple times and
each will be checked for a map base dn in the order they occur in the configuration. The search
base list is read at startup and whenever the daemon recieves a HUP signal.

MAP_OBJECT_CLASS
The map object class. In the nisMap schema this corresponds to the class nisMap and in the auto‐
mountMap schema it corresponds to the class automountMap.

ENTRY_OBJECT_CLASS
The map entry object class. In the nisMap schema this corresponds to the class nisObject and in
the automountMap schema it corresponds to the class automount.

MAP_ATTRIBUTE
The attribute used to identify the name of the map to which this entry belongs. In the nisMap
schema this corresponds to the attribute nisMapName and in the automountMap schema it corresponds
to the attribute ou or automountMapName.

ENTRY_ATTRIBUTE
The attribute used to identify a map key. In the nisMap schema this corresponds to the attribute
cn and in the automountMap schema it corresponds to the attribute automountKey.

VALUE_ATTRIBUTE
The attribute used to identify the value of the map entry. In the nisMap schema this corresponds
to the attribute nisMapEntry and in the automountMap schema it corresponds to the attribute auto‐
mountInformation.

NOTE: It is essential that entries use class and attribute in a consistent manner for correct operation
of autofs. For example mixing cn and automountKey attributes in automount schema map entries won't
work as expected.

LDAP AUTHENTICATION, ENCRYPTED AND CERTIFIED CONNECTIONS

       LDAP authenticated binds, TLS encrypted connections and certification may be used by setting  appropriate
       values  in  the autofs authentication configuration file and configuring the LDAP client with appropriate
       settings.  The default location of this file is /etc/autofs_ldap_auth.conf.  If this file exists it  will
       be used to establish whether TLS or authentication should be used.

       An example of this file is:

         <?xml version="1.0" ?>
         <autofs_ldap_sasl_conf
                 usetls="yes"
                 tlsrequired="no"
                 authrequired="no"
                 authtype="DIGEST-MD5"
                 user="xyz"
                 secret="abc"
         />

       If  TLS encryption is to be used the location of the Certificate Authority certificate must be set within
       the LDAP client configuration in order to validate the server certificate. If, in addition,  a  certified
       connection  is to be used then the client certificate and private key file locations must also be config‐
       ured within the LDAP client.

       In OpenLDAP these may be configured in the ldap.conf file or in the per-user configuration.  For  example
       it  may  be  sensible  to use the system wide configuration for the location of the Certificate Authority
       certificate and set the location of the client certificate and private key in the per-user configuration.
       The location of these files and the configuration entry requirements is system dependent so the  documen‐
       tation for your installation will need to be consulted to get further information.

       See autofs_ldap_auth.conf(5) for more information.

EXAMPLE

         /-        auto.data
         /home     /etc/auto.home
         /mnt      yp:mnt.map

       This will generate two mountpoints for /home and /mnt and install direct mount triggers for each entry in
       the  direct  mount  map  auto.data.   All  accesses  to /home will lead to the consultation of the map in
       /etc/auto.home and all accesses to /mnt will consult the NIS map mnt.map.  All accesses to paths  in  the
       map  auto.data  will trigger mounts when they are accessed and the Name Service Switch configuration will
       be used to locate the source of the map auto.data.

AUTHOR

       This manual page was written by Christoph Lameter <chris@waterf.org>, for the  Debian  GNU/Linux  system.
       Edited by <hpa@transmeta.com> and Ian Kent <raven@themaw.net> .

                                                   11 Apr 2006                                    AUTO.MASTER(5)