NAME

exports, xtab − directories to export to NFS clients

SYNOPSIS

/etc/exports

/etc/xtab

DESCRIPTION

The /etc/exports file contains entries for directories that can be exported to NFS clients.  This file is read automatically by the exportfs(1M) command.  If you change this file, you must run exportfs(1M) for the changes to affect the daemon’s operation. 

Only when this file is present at boot time does the /etc/rc script execute exportfs(1M) and start the NFS file-system daemon, nfsd(1M). 

The /etc/xtab file contains entries for directories that are currently exported.  This file should only be accessed by programs using getexportent (see exportent(3)).  (Use the −u option of exportfs to remove entries from this file). 

An entry for a directory consists of a line of the following form:

directory   −option[,option ]...

directory is the pathname of a directory (or file). 

option is one of

ro Export the directory read-only. If not specified, the directory is exported read-write. 

rw=hostnames[:hostname]...
Export the directory read-mostly. Read-mostly means read-only to most machines, but read-write to those specified. If not specified, the directory is exported read-write to all.

anon=uid
If a request comes from an unknown user, use uid as the effective user ID.  Note: root users (uid 0) are always considered “unknown” by the NFS server, unless they are included in the “root” option below. The default value for this option is −2.  Setting “anon” to −1 disables anonymous access. Note: by default secure NFS will accept insecure requests as anonymous, and those wishing for extra security can disable this feature by setting “anon” to −1. 

root=hostnames[:hostname]...
Give root access only to the root users from a specified hostname. The default is for no hosts to be granted root access.

access=client[:client]...
Give mount access to each client listed.  A client can either be a hostname, or a netgroup (see netgroup(4)).  Each client in the list is first checked for in the netgroup database, and then the hosts database.  The default value allows any machine to mount the given directory. 

secure
Require clients to use a more secure protocol when accessing the directory.

A ‘#’ (pound-sign) anywhere in the file indicates a comment that extends to the end of the line. 

EXAMPLE

/usr−access=clients# export to my clients
/usr/local# export to the world
/usr2−access=hermes:zip:tutorial # export to only these machines
/usr/sun−root=hermes:zip# give root access only to these
/usr/new−anon=0# give all machines root access
/usr/bin−ro# export read-only to everyone
/usr/stuff−access=zip,anon=−3,ro# several options on one line

FILES

/etc/exports

/etc/xtab

/etc/hosts

/etc/netgroup

/etc/rc

SEE ALSO

mountd(1M), exportent(3), hosts(4C), netgroup(4), exportfs(1M), nfsd(1M)

WARNINGS

You cannot export either a parent directory or a subdirectory of an exported directory that is within the same filesystem. It would be illegal, for instance, to export both /usr and /usr/local if both directories resided on the same disk partition. 

CX/UX Network File System