Installation guide

Chapter 10. Network File System (NFS)

* fileserver.example.com:/export/home/&

• The file map /etc/auto.home does not exist.

Given these conditions, let's assume that the client system needs to override the NIS map

auto.home and mount home directories from a different server. In this case, the client will need to

use the following /etc/auto.master map:

/home -/etc/auto.home

+auto.master

And the /etc/auto.home map contains the entry:

* labserver.example.com:/export/home/&

Because the automounter only processes the first occurrence of a mount point, /home will contain the

contents of /etc/auto.home instead of the NIS auto.home map.

Alternatively, if you just want to augment the site-wide auto.home map with a few entries, create a /

etc/auto.home file map, and in it put your new entries and at the end, include the NIS auto.home

map. Then the /etc/auto.home file map might look similar to:

mydir someserver:/export/mydir

+auto.home

Given the NIS auto.home map listed above, ls /home would now output:

beth joe mydir

This last example works as expected because autofs knows not to include the contents of a file map

of the same name as the one it is reading. As such, autofs moves on to the next map source in the

nsswitch configuration.

10.3.4. Using LDAP to Store Automounter Maps

LDAP client libraries must be installed on all systems configured to retrieve automounter maps from

LDAP. On Red Hat Enterprise Linux, the openldap package should be installed automatically as a

dependency of the automounter. To configure LDAP access, modify /etc/openldap/ldap.conf.

Ensure that BASE, URI, and schema are set appropriately for your site.

The most recently established schema for storing automount maps in LDAP is described by

rfc2307bis. To use this schema it is necessary to set it in the autofs configuration (/etc/

sysconfig/autofs) by removing the comment characters from the schema definition. For example:

DEFAULT_MAP_OBJECT_CLASS="automountMap"

DEFAULT_ENTRY_OBJECT_CLASS="automount"

DEFAULT_MAP_ATTRIBUTE="automountMapName"

DEFAULT_ENTRY_ATTRIBUTE="automountKey"

DEFAULT_VALUE_ATTRIBUTE="automountInformation"

Ensure that these are the only schema entries not commented in the configuration. Note that the

automountKey replaces the cn attribute in the rfc2307bis schema. An LDIF of a sample

configuration is described below:

# extended LDIF