`/etc/exports`

Define remote mountpoints for NFS mount requests

The exports file defines remote mountpoints for the NFS mount protocol according to the NFS server specification; see RFC 1094 (Network File System Protocol Specification) and RFC 1813 (NFS Version 3 Protocol Specification).

There isn't a default version of this file; you can create your own if you need it.

Each line in the file specifies one remote mountpoint. The first field contains the mount-point directory path, followed optionally by a list of options and/or a list of specific hosts separated by whitespace. If no specific hosts are specified, the mount point is exported to all hosts.

Here are the export options:

-mask=netmask -match=network

Restrict access to hosts belonging to subnet defined by netmask and network. By default, there's no restriction. Access is determined by:

((client_ip & netmask) == network)

-norsvd

Don't check incoming requests, they're from a reserved port. By default, NFS requests from ports greater than IPPROTO_RESERVED are replied to with EACCES.

-ro

Export the filesystem as read-only. By default, the filesystem is exported as read/write.

-root=uid

Map root's uid (real user ID). By default, root is mapped to -2.

Let's now look at an example file:

/usr -root=1 rickers snowhite.cis.uoguelph.ca
/usr/local 131.104.48.16
/u -root=5 -mask=255.255.240.0 -match=131.104.0.0
/u2 -ro -mask=255.0.0.0 -match=10.0.0.0 node11 node23

The above example specifies the following:

This mountpoint:	Is exported:
`/usr`	To hosts `rickers` and `snowhite.cis.uoguelph.ca` only, with `root` mapped to `1` and with read/write access.
`/usr/local`	To host `131.104.48.16` only, with `root` mapped to `-2` and with read/write access.
`/u`	To all hosts within `131.104.0.0` to `131.104.15.255`, with `root` mapped to `5` and with read/write access.
`/u2`	To hosts `node11` and `node23` and to hosts belonging to IP network `10` only, with `root` mapped to `-2` and with read-only access.

Limitations:

1 subnet per mountpoint

10 hosts per mountpoint

`/etc/exports`

Name:

Description:

Limitations:

See also: