HP-UX Reference (11i v1 00/12) - 4 File Formats (vol 8)

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exports(4) exports(4)

"hosts" entry, any hostname must be represented as a fully qualiﬁed DNS name.

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

availableto everyone.

A # anywhere in the ﬁle indicates a comment extending to the end of that line.