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Because the directory /home/jdoe is automounted, the following steps are used by the automounter to allow you to access the file: 1. The automounter looks at the pathname and determines that the directory / home is controlled by the indirect map auto_home. 2. The automounter looks at the rest of the pathname for a corresponding entry in the auto_home map. In this case it finds the matching entry, jdoe. 3. Once a matching entry has been found, the automounter checks to see if the directory /home/jdoe is already mounted. If the directory is already mounted, you can directly access the file; otherwise, the automounter mounts this directory and then allows you to access the file.
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26:
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Direct Maps
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When you use an indirect map, the automounter takes complete control of the directory corresponding to the indirect map. This means that no user, not even root, can create entries in a directory corresponding to an indirect map. For this reason, directories specified in an indirect map cannot be automounted on top of an existing directory. In this case you need a special type of map known as a direct map. A direct map allows you to mix automounter mount points and normal directories in the same directory tree. The directories specified in a direct map have nonregular mount points, which simply means that they do not share a common prefix. A common use for direct maps is to allow for directories in the /usr directory tree to be automounted. The direct map is normally stored in the file /etc/auto_direct. The format of this file is similar to the format of the indirect maps:
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Here, directory is the absolute pathname of a directory. For options, you can use any of the mount options covered earlier in this chapter. To specify options, you need to prefix the first option with a dash ( ). If you do not need any extra options, you can omit the options entirely. The final entry in the map contains the location of the NFS file system. Here is an example of the direct map that is responsible for some of the directories in /usr:
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# /etc/auto_direct - Direct Automount map /usr/pubsw/man orem:/internal/opt/man /usr/doc orem:/internal/httpd/htdocs
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When any files in the directories /usr/pubsw/man or /usr/doc are accessed, the automounter automatically handles the mounting of these directories.
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Master Maps
When the automounter first starts, it reads the file /etc/auto_master to determine where to find the direct and indirect map files. The auto_master file is known as the master map. It consists of lines whose format is as follows:
directory map
Here, directory is the name of the directory that corresponds to the indirect map. For a direct map, this entry is / . The map is the name of the map file in the /etc directory corresponding to the directory given in the first column. The following example shows a master map file for the direct and indirect maps given earlier in this section:
# Master map for automounter /home auto_home /auto_direct
Part VI:
Services, Directories, and Applications
Other entries can also be made in the master map. For example, to share a common directory for mail between a number of clients and a mail server, you would enter the following definition:
//etc/auto_mail
This creates a share called auto_mail that makes mail on a single server accessible to all client machines upon request. The automounter permits two kinds of shares that can be defined by direct and indirect maps: a direct map is a set of arbitrary mount points that are listed together, while an indirect map mounts everything under a specific directory. For example, auto_home mounts user directories and all subdirectories underneath them. If an automounted share is available on the server, then you should see its details being displayed in the /etc/mnttab file:
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