AUTOFS.CONF(23 Jan 2014) AUTOFS.CONF(23 Jan 2014)

NAME autofs.conf - autofs configuration

DESCRIPTION Configuration settings used by automount(8) may be changed in the con- figuration file /etc/autofs.conf.

This file contains two primary sections, autofs and amd.

Configuration entries may be present at the beginning of the configura- tion file without a section header and are implicitly included as part of the autofs section.

Each section name is enclosed in square brackets with spaces between the brackets and the section name. The amd section may be followed by further sections, named by the top level mount point path, that contain per mount configuration settings.

SECTION autofs CONFIGURATION OPTIONS Configuration settings available are:

timeout Sets the default mount timeout in seconds. The internal program default is 10 minutes, but the default installed configuration overrides this and sets the timeout to 5 minutes to be consis- tent with earlier autofs releases.

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 isnt 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 isnt 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 cant 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 default "yes", append options).

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

LDAP Configuration 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 seperated 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 given 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 automountMap schema it corresponds to the class automountMap.

entry_object_class The map entry object class. In the nisMap schema this corre- sponds 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 corre- sponds 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 automountInformation.

NOTE: It is essential that entries use class and attribute in a con- sistent manner for correct operation of autofs. For example mixing cn and automountKey attributes in automount schema will not work as expected.

auth_conf_file This configuration option may be used to specify an alternate location for the ldap authentication configuration file. See autofs_ldap_auth.conf(5) for more information.

SECTION amd CONFIGURATION OPTIONS A number of the amd configuration options are not used by autofs, some because they are not relevant within autofs, some because they are done differently in autofs and others that are not yet implemented.

Since mount_type is always autofs (because theres no user space NFS server) the configuration entries relating to that arent used. Also, server availability is done differently within autofs so the options that relate to the amd server monitoring sub-system are also not used.

These options are mount_type, auto_attrcache, portmap_program, nfs_vers_ping, nfs_allow_any_interface, nfs_allow_insecure_port, nfs_proto, nfs_retransmit_counter, nfs_retransmit_counter_udp, nfs_retransmit_counter_tcp, nfs_retransmit_counter_toplvl, nfs_retry_interval, nfs_retry_interval_udp, nfs_retry_interval_tcp, nfs_retry_interval_toplvl and nfs_vers.

Other options that are not used within the autofs implementation:

log_file, truncate_log sends its output to syslog so an alternate log file (or truncat- ing the log) cant be used.

print_pid There s no corresponding option for this within autofs.

use_tcpwrappers, show_statfs_entries Theres no user space NFS server to control access to so this option isnt relevant. The show_statfs_entries can t be imple- mented for the same reason.

debug_mtab_file Theres no user space NFS server and autofs avoids using file based mtab whenever possible.

sun_map_syntax Sun map format is handled by autofs itself.

plock, show_statfs_entries, preferred_amq_port Are not supported by autofs.

ldap_cache_maxmem, ldap_cache_seconds External ldap caching is not used by autofs.

ldap_proto_version autofs always attempts to use the highest available ldap proto- col version.

cache_duration, map_reload_interval, map_options The map entry cache is continually updated and stale entries cleaned on re-load, which is done when map changes aredetected so these configuration entries are not used by autofs.

localhost_address This is not used within autofs. This configuration option was only used in the amd user space server code and is not relevant within autofs.

Options that are handled differently within autofs:

pid_file To specify a pid file name a command line option must be used on startup.

print_version Program version and feature information is obtained by using the automount command line option "-V".

debug_options , log_options autofs has somewhat more limited logging and debug logging options. When the log_options options is encountered it is con- verted to the nearest matching autofs logging option. Since the configuration option debug_options would be handled the same way it is ignored.

restart_mounts This option has no sensible meaning within autofs because autofs always tries to re-connect to existing mounts. While this has its own set of problems not re-connecting to existing mounts always results in a non-functional automount tree if mounts were busy at the last shutdown (as is also the case with amd when using mount_type autofs).

forced_unmounts Detaching mounts often causes serious problems for users of existing mounts. It is used by autofs in some cases, either at the explicit request of the user (with a command line or init option) and in some special cases during program operation but is avoided whenever possible.

A number of configuration options are not yet implemented:

search_path Always a little frustrating, the compiled in map location should be used to locate maps but isn t in some cases. This requires work within autofs itself and that will (obviously) include implementing this configuration option for the amd map parser as well.

fully_qualified_hosts Not yet implemented.

unmount_on_exit Since autofs always tries to re-connect to mounts left mounted from a previous shutdown this is a sensible option to implement and that will be done.

browsable_dirs Not yet implemented.

exec_map_timeout A timeout is not currently used for for program maps, might be implemented.

tag The tag option is not implemented within autofs.

Supported options:

arch, karch, os, osver These options default to what is returned from uname(2) and can be overridden if required.

full_os This option has no default and must be set in the configuration if used in maps.

cluster If not set defaults to the host domain name. This option corre- sponds to the HP_UX cluster name (according to the amd source) and is probably not used in Linux but is set anyway.

vendor This option has a default value of "unknown", it must be set in the configuration if used in maps.

auto_dir Is the base name of the mount tree used for external mounts that are sometimes needed by amd maps. Its default value is "/a".

map_type Specifies the autofs map source, such as file, nis, ldap etc. and has no default value set.

map_defaults This option is used to override /defaults entries within maps and can be used to provide different defaults on specific machines without having to modify centrally managed maps. It is empty by default.

search_path Colon seperated paths to search for maps that are not specified as a full path.

dismount_interval Is equivalent to the autofs timeout option. It is only possible to use this with type "auto" mounts due to the way the autofs kernel module performs expiry. It takes its default value from the autofs internal defaulti of 600 seconds.

autofs_use_lofs If set to "yes" autofs will attempt to use bind mounts for type "auto" when possible.

nis_domain Allows setting of a domain name other than the system default.

local_domain Is used to override (or set) the host domain name.

normalize_hostnames If set to "yes" then the contents of ${rhost} is translated in its official host name.

domain_strip If set to "yes" the domain name part of the host is strippped when normalizing hostnames. This can be useful when using of the same maps in a multiple domain environment.

normalize_slashes This option is set to "yes" by default and will collapse multi- ple unescaped occurrences of "/" to a single "/".

selectors_in_defaults, selectors_on_default This option has a default value of "no". If set to "yes" then any defaults entry will be checked for selectors to determine the values to be used. selectors_in_defaults is the preferred option to use.

ldap_base iThis option has no default value. It must be set to the base dn that is used for queries if ldap is to be used as a map source.

ldap_hostports This option has no default value set. It must be set to the URI of the LDAP server to be used for lookups wheni ldap is used a map source. It may contain a comma or space seperated list of LDAP URIs.

hesiod_base Sets the base name used for hesiod map sources.

linux_ufs_mount_type This is an aditional configuration option for the autofs amd format parser implementation.

Theres no simple way to determine what the system default filesystem is and am-utils needs to be continually updated to do this and can easily get it wrong ayway. So allow it to be set in the configuration.

EXAMPLE [ autofs ] timeout = 300 browse_mode = no

[ amd ] dismount_interval = 300 map_type = nis autofs_use_lofs = no

[ /expamle/mount ] dismount_interval = 60 map_type = file

SEE ALSO automount(8), auto.master(5), autofs_ldap_auth.conf(5)

AUTHOR This manual page was written by Ian Kent <>.

AUTOFS.CONF(23 Jan 2014)