HP-UX Reference (11i v1 05/09) - 4 File Formats (vol 8)

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exports(4) exports(4)
Currently HP-UX will allow a match for a non-fully qualified hostname; this HP-
only feature will be obsoleted in a later release of HP-UX.
netgroup
A netgroup contains a number of hostnames. With a server configured for DNS
naming in the nsswitch "hosts" entry, any hostname in a netgroup must be
represented as a fully qualified DNS name.
DNS suffix
To use domain membership the server must use DNS to resolve hostnames to IP
addresses; that is, the "hosts" entry in the
/etc/nsswitch.conf
must
specify "dns" ahead of "nis" or "nisplus", since only DNS returns the full domain
name of the host. Other name services like NIS or NIS+ cannot be used to
resolve hostnames on the server, because when mapping an IP address to a host-
name, they do not return domain information. For example,
NIS or NIS+
129.144.45.9 --> "myhost"
DNS
129.144.45.9 --> "myhost.myd.myc.com"
The DNS suffix is distinguished from hostnames and netgroups by a prefixed dot.
A dot by itself will match "myhost" but not "myhost.myd.mycy.com". This single
dot feature can be used to match hosts resolved from NIS and NIS+ rather than
DNS.
network
The network or subnet component is preceded by an at-sign (@). It can be either
a name or a dotted address. If a name, it will be converted to a dotted address
by
getnetbyname (see getnetent(3N)). Entries in /etc/networks
must
contain all four octets in order to be valid.
The network prefix assumes an octet aligned netmask determined from the zero
octets in the low order part of the address. In the case where network prefixes
are not byte-aligned, the syntax will allow a mask length to be specified explicitly
following a slash (/) delimiter. Where the mask is the number of leftmost con-
tiguous significant bits in the corresponding IP address.
- A prefixed minus sign (-) denies access to that component of access_list. The list
is searched sequentially until a match is found that either grants or denies
access, or until the end of the list is reached. This option is valid only in conjunc-
tion with hostname, network and DNS Suffix. If prefixing a hostname and you
are configured for DNS naming, you must fully qualify the hostname.
async Specifying async increases write performance on the NFS server by causing asynchronous
writes on the NFS server. The async option can be specified anywhere on the command
line after directory. Before using this option, refer to WARNINGS below.
# A # character anywhere in the file indicates a comment that extends to the end of the line.
A directory name with no accompanying name list allows any machine to mount the given directory.
/etc/exports contains a list of file systems and the access_lists or machine names allowed to
remotely mount each file system. The file system names are left-justified and followed by a list of names
separated by white space. A file system name with no accompanying name list means the file system is
available to everyone.
A # anywhere in the file indicates a comment extending to the end of that line.
EXAMPLES
/usr/games cocoa fudge # export to only these machines
/usr -access=clients # export to my clients
/usr/local # export to the world
/usr2 -access=bison:deer:pup # export to only these machines
/var/adm -root=bison:deer # give root access only to these
/usr/new -anon=0 # give all machines root access
/usr/temp -rw=ram:alligator # export read-write only to these
HP-UX 11i Version 1: September 2005 − 2 − Hewlett-Packard Company Section 4−−51