Introduction to Autofs in Mac OS X: "OS X auto_master and auto_home
The /etc/auto_master file controls the auto-mounted Network File System (NFS) file systems. If you are going to mount NFS volumes from a Linux server, there is one gotcha that I covered in an earlier blog post.
The auto_master defines all "maps" which are collections of automounts related by mount point and organized in one file (or directory service entry). Here is what the default file looks like on my Mac:
# Automounter master map
+auto_master # Use directory service
/net -hosts -nobrowse,nosuid
/home auto_home -nobrowse
'via Blog this'