exports - NFS file systems being exported
/etc/exports
The file /etc/exports serves as the access control list for file systems which may be exported to NFS clients. It it used by both the NFS mount daemon, mountd(8) and the NFS file server daemon nfsd(8) .
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The file format is similar to the SunOS exports file,
except that several additional options are permitted.
Each line contains a mount point and a list of machine or
netgroup names allowed to mount the file system at that
point. An optional parenthesized list of mount parameters
may follow each machine name. Blank lines are ignored,
and a # introduces a comment to the end of the line.
Entries may be continued across newlines using a backslash.
NFS clients may be specified in a number of ways:
single host
This is the most common format. You may specify a
host either by an abbreviated name recognizued be
the resolver, the fully qualified domain name, or
an IP address.
netgroups
NIS netgroups may be given as @group. Only the
host part of all netgroup members is extracted and
added to the access list. Empty host parts or those
containing a single dash (-) are ignored.
wildcards
Machine names may contain the wildcard characters *
and ?. This can be used to make the exports file
more compact; for instance, *.cs.foo.edu matches
all hosts in the domain cs.foo.edu. However, these
wildcard characters do not match the dots in a
domain name, so the above pattern does not include
hosts such as a.b.cs.foo.edu.
IP networks
You can also export directories to all hosts on an
IP (sub-) network simultaneously. This is done by
specifying an IP address and netmask pair as
address/netmask.
=public
This is a special ``hostname'' that identifies the
given directory name as the public root directory
(see the section on WebNFS in nfsd(8)
for a discussion
of WebNFS and the public root handle). When
using this convention, =public must be the only
entry on this line, and must have no export options
associated with it. Note that this does not actually
export the named directory; you still have to
set the exports options in a separate entry.
The public root path can also be specified by invoking nfsd with the --public-root option. Multiple specifications of a public root will be ignored.
mountd and nfsd understand the following export options:
secure This option requires that requests originate on an internet port less than IPPORT_RESERVED (1024). This option is on by default. To turn it off, specify insecure.
noaccess
This makes everything below the directory inaccessible
for the named client. This is useful when
you want to export a directory hierarchy to a
client, but exclude certain subdirectories. The
client's view of a directory flagged with noaccess
is very limited; it is allowed to read its
attributes, and lookup `.' and `..'. These are also
the only entries returned by a readdir.
link_relative
Convert absolute symbolic links (where the link
contents start with a slash) into relative links by
prepending the necessary number of ../'s to get
from the directory containing the link to the root
on the server. This has subtle, perhaps questionable,
semantics when the file hierarchy is not
mounted at its root.
link_absolute
Leave all symbolic link as they are. This is the
default operation.
nfsd bases its access control to files on the server machine on the uid and gid provided in each NFS RPC request. The normal behavior a user would expect is that she can access her files on the server just as she would on a normal file system. This requires that the same uids and gids are used on the client and the server machine. This is not always true, nor is it always desirable.
Very often, it is not desirable that the root user on a client machine is also treated as root when accessing files on the NFS server. To this end, uid 0 is normally mapped to a different id: the so-called anonymous or nobody uid. This mode of operation (called `root squashing') is the default, and can be turned off with no_root_squash.
By default, nfsd tries to obtain the anonymous uid and gid by looking up user nobody in the password file at startup time. If it isn't found, a uid and gid of -2 (i.e. 65534) is used. These values can also be overridden by the anonuid and anongid options.
In addition to this, nfsd lets you specify arbitrary uids and gids that should be mapped to user nobody as well. Finally, you can map all user requests to the anonymous uid by specifying the all_squash option.
For the benefit of installations where uids differ between different machines, nfsd provides a way to dynamically map server uids to client uids and vice versa. This is enabled with the map_daemon option, and uses the UGID RPC protocol. For this to work, you have to run the ugidd(8) mapping daemon on the client host.
Here's the complete list of mapping options:
root_squash
Map requests from uid/gid 0 to the anonymous
uid/gid. Note that this does not apply to any other
uids that might be equally sensitive, such as user
bin.
no_root_squash
Turn off root squashing. This option is mainly useful
for diskless clients.
squash_uids and squash_gids
This option specifies a list of uids ir gids that
should be subject to anonymous mapping. A valid
list of ids looks like this:
squash_uids=0-15,20,25-50
Usually, your squash lists will look a lot simpler.
all_squash
Map all uids and gids to the anonymous user. Useful
for NFS-exported public FTP directories, news spool
directories, etc. The opposite option is
no_all_squash, which is the default setting.
map_daemon
This option turns on dynamic uid/gid mapping. Each
uid in an NFS request will be translated to the
equivalent server uid, and each uid in an NFS reply
will be mapped the other way round. This option
requires that rpc.ugidd(8)
runs on the client host.
The default setting is map_identity, which leaves
all uids untouched. The normal squash options apply
regardless of whether dynamic mapping is requested
or not.
anonuid and anongid
These options explicitly set the uid and gid of the
anonymous account. This option is primarily useful
for PC/NFS clients, where you might want all
requests appear to be from one user. As an example,
consider the export entry for /home/joe in the
example section below, which maps all requests to
uid 150 (which is supposedly that of user joe).
# sample /etc/exports file
The first line exports the entire filesystem to machines master and trusty. In addition to write access, all uid squashing is turned off for host trusty. The second and third entry show examples for wildcard hostnames and netgroups (this is the entry `@trusted'). The fourth line shows the entry for the PC/NFS client discussed above. Line 5 exports the public FTP directory to every host in the world, executing all requests under the nobody account. The insecure option in this entry also allows clients with NFS implementations that don't use a reserved port for NFS. The last line denies all NFS clients access to the private directory.
Unlike other NFS server implementations, this nfsd allows you to export both a directory and a subdirectory thereof to the same host, for instance /usr and /usr/X11R6. In this case, the mount options of the most specific entry apply. For instance, when a user on the client host accesses a file in /usr/X11R6, the mount options given in the /usr/X11R6 entry apply. This is also true when the latter is a wildcard or netgroup entry.
/etc/exports
An error parsing the file is reported using syslogd(8) as level NOTICE from a DAEMON whenever nfsd(8) or mountd(8) is started up. Any unknown host is reported at that time, but often not all hosts are not yet known to named(8) at boot time, thus as hosts are found they are reported with the same syslogd(8) parameters.