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   auto.master    ( 5 )

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BUILTIN MAP -hosts

If "-hosts" is given as the map then accessing a key under the
       mount point which corresponds to a hostname will allow access to
       the exports of that host. The hosts map cannot be dynamically
       updated and requires a HUP signal to be sent to the daemon for it
       to check hosts for an update. Due to possible hierarchic
       dependencies within a mount tree, it might not be completely
       updated during the HUP signal processing.

       For example, with an entry in the master map of /net -hosts
       accessing /net/myserver will mount exports from myserver on
       directories below /net/myserver.

       NOTE: mounts done from a hosts map will be mounted with the
       "nosuid,nodev" options unless overridden by explicitly specifying
       the "suid", "dev" options in the master map entry.