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HOSTNAME(7)                Linux Programmer's Manual               HOSTNAME(7)



NAME
       hostname - hostname resolution description

DESCRIPTION
       Hostnames are domains, where a domain is a hierarchical, dot-separated list of sub-
       domains; for example, the machine monet, in the Berkeley subdomain of the EDU  sub-
       domain of the Internet would be represented as

           monet.Berkeley.EDU

       (with no trailing dot).

       Hostnames are often used with network client and server programs, which must gener-
       ally translate the name to an address for use.  (This task is  generally  performed
       by either getaddrinfo(3) or the obsolete gethostbyname(3).)  Hostnames are resolved
       by the Internet name resolver in the following fashion.

       If the name consists of a single component, that is, contains no dot,  and  if  the
       environment  variable  HOSTALIASES  is  set  to  the  name  of a file, that file is
       searched for any string matching the input hostname.  The file  should  consist  of
       lines made up of two white-space separated strings, the first of which is the host-
       name alias, and the second of which is the complete hostname to be substituted  for
       that  alias.   If  a  case-insensitive  match  is  found between the hostname to be
       resolved and the first field of a line in the file, the substituted name is  looked
       up with no further processing.

       If  the  input  name ends with a trailing dot, the trailing dot is removed, and the
       remaining name is looked up with no further processing.

       If the input name does not end with a trailing dot, it is looked  up  by  searching
       through a list of domains until a match is found.  The default search list includes
       first the local domain, then its parent domains with at  least  2  name  components
       (longest   first).    For   example,   in  the  domain  CS.Berkeley.EDU,  the  name
       lithium.CChem will be checked first as lithium.CChem.CS.Berkeley.EDU  and  then  as
       lithium.CChem.Berkeley.EDU.   Lithium.CChem.EDU will not be tried, as there is only
       one component remaining from the local domain.  The search path can be changed from
       the default by a system-wide configuration file (see resolver(5)).

SEE ALSO
       gethostbyname(3), resolver(5), mailaddr(7), named(8)

COLOPHON
       This page is part of release 3.22 of the Linux man-pages project.  A description of
       the project, and information about reporting bugs, can be found at  http://www.ker-
       nel.org/doc/man-pages/.



Linux                             2008-06-11                       HOSTNAME(7)

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