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

       hostname - hostname resolution description

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


       (with no trailing dot).

       Hostnames are often used with network client and server programs, which must generally 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  HOSTAL-
       IASES 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 hostname 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)).

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

       This  page  is part of release 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at

Linux                             2008-06-11                       HOSTNAME(7)