AMD—AutoMount Daemon

Here's a way to make system administration easier when dealing with NFS.
Running AMD

To run AMD, you simply type amd at the prompt, providing the mount point(s) amd the map(s) on the command line. For example, if the map in listing 1 is named /etc/map.main, and a map named /etc/map.silly also exists, to execute AMD you would type:

amd /u /etc/map.main /silly /etc/map.silly

It is a good idea to include this statement in your rc files.

A number of options are available for the amd command. Two useful options are the ability to specify the NFS mount points and the timeout period. The program amq helps control AMD. For example, amq can force AMD to unmount a file system and to flush the cache (useful when debugging NFS problems). The man page for amq provides a complete description of all its capabilities.

NFS Considerations

Because AMD is just a front end to regular NFS, you have to worry about the same issues that you would when running NFS alone—you must ensure that exports and their options are correct. Explaining NFS is beyond the scope of this article; however, if you are unfamiliar with the basics of NFS, see the NFS Resources box on page FIXME.

How to Get AMD

Binaries and patches to port AMD to Linux may be obtained from sunsite and other sources (see sidebar). AMD has stayed relatively stable and bug free in the last few years; development is no longer active. AMD comes with excellent documentation.


NFS Resources

Matthew Crosby is a system administrator and student at the University of Colorado, Boulder. He has administered practically every system in existence, and has used Linux since the early .9* days. He can be reached via e-mail at