## 3.10. Exporting Directories with NFS

Mac OS X 10.1 (and earlier versions of Mac OS X) stored NFS exports in the /exports portion of the NetInfo directory. As of Mac OS X 10.2, however, you can use the /etc/exports file. For example, the following line exports the /Users directory to two hosts (192.168.0.134 and 192.168.0.106):

>     /Users  -ro -mapall=nobody 192.168.0.134 192.168.0.106

The NFS server will start automatically at boot time if there are any exports in the NetInfo database. After you've set up your exports, you can reboot, and NFS should start automatically. NFS options supported by Mac OS X include the following:

-maproot`=```user``
  Specifies that the remote root user should be mapped to the specified user. You may specify either a username or numeric user ID.
-maproot`=```user```:[``group``[:``group``...]]`
  Specifies that the remote root user should be mapped to the specified user with the specified group credentials. If you include the colon with no groups, as in -maproot`=username:`, it means the remote user should have no group credentials. You may specify a username or numeric user ID for `user` and a group name or numeric group ID for `group`.
-mapall`=```user``
  Specifies that all remote users should be mapped to the specified user.
-mapall`=```user```:[``group``[:``group``...]]`
  Specifies that all remote users should be mapped to the specified user with the specified group credentials. If you include the colon with no groups, as in mapall`=username:`, it specifies that the remote user should be given no group credentials.
-kerb
  Uses a Kerberos authentication server to authenticate and map client credentials.
-ro
  Exports the file system read-only. The synonym `-o` is also supported.

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