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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 subdomains;
       for example, the machine "monet", in the "example" subdomain of the "com" domain would  be
       represented as "monet.example.com".

       Each element of the hostname must be from 1 to 63 characters long and the entire hostname,
       including the dots, can be at most 253 characters long.  Valid  characters  for  hostnames
       are  ASCII(7) letters from a to z, the digits from 0 to 9, and the hyphen (-).  A hostname
       may not start with a hyphen.

       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 NSS framework in glibc according to the hosts  configuration
       in  nsswitch.conf.   The  DNS-based name resolver (in the dns NSS service module) resolves
       them in the following fashion.

       If the name consists of a single component, that is, contains no dot, and if the  environ-
       ment  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 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 ex-
       ample, in the domain cs.example.com, the name  lithium.cchem  will  be  checked  first  as
       lithium.cchem.cs.example  and  then  as lithium.cchem.example.com.  lithium.cchem.com 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 re-
       solver(5)).

SEE ALSO
       getaddrinfo(3), gethostbyname(3), nsswitch.conf(5), resolver(5), mailaddr(7), named(8)

       IETF RFC 1123 <http://www.ietf.org/rfc/rfc1123.txt>

       IETF RFC 1178 <http://www.ietf.org/rfc/rfc1178.txt>

COLOPHON
       This page is part of release 5.10 of the Linux man-pages project.  A  description  of  the
       project,  information  about  reporting  bugs, and the latest version of this page, can be
       found at https://www.kernel.org/doc/man-pages/.

Linux                                       2019-05-09                                HOSTNAME(7)

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