04-12-2007
Hey,
you're right, DNS will need first RAM and then a little bit CPU.
Our first DNS-Server was a 266 MHz CPU with 1 GB RAM, we
hosted about 300 Domains.
Bye
lowbyte
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HOSTS(5) Debian GNU/Linux manual HOSTS(5)
NAME
hosts - The static table lookup for host names
SYNOPSIS
/etc/hosts
DESCRIPTION
This manual page describes the format of the /etc/hosts file. This file is a simple text file that associates IP addresses with hostnames,
one line per IP address. For each host a single line should be present with the following information:
IP_address canonical_hostname aliases
Fields of the entry are separated by any number of blanks and/or tab characters. Text from a "#" character until the end of the line is a
comment, and is ignored. Host names may contain only alphanumeric characters, minus signs ("-"), and periods ("."). They must begin with
an alphabetic character and end with an alphanumeric character. Aliases provide for name changes, alternate spellings, shorter hostnames,
or generic hostnames (for example, localhost). The format of the host table is described in RFC 952.
The Berkeley Internet Name Domain (BIND) Server implements the Internet name server for UNIX systems. It augments or replaces the
/etc/hosts file or host name lookup, and frees a host from relying on /etc/hosts being up to date and complete.
In modern systems, even though the host table has been superseded by DNS, it is still widely used for:
bootstrapping
Most systems have a small host table containing the name and address information for important hosts on the local network. This is
useful when DNS is not running, for example during system bootup.
NIS Sites that use NIS use the host table as input to the NIS host database. Even though NIS can be used with DNS, most NIS sites still
use the host table with an entry for all local hosts as a backup.
isolated nodes
Very small sites that are isolated from the network use the host table instead of DNS. If the local information rarely changes, and
the network is not connected to the Internet, DNS offers little advantage.
EXAMPLE
127.0.0.1 localhost
192.168.1.10 foo.mydomain.org foo
192.168.1.13 bar.mydomain.org bar
216.234.231.5 master.debian.org master
205.230.163.103 www.opensource.org
HISTORICAL NOTE
Before the advent of DNS, the host table was the only way of resolving hostnames on the fledgling Internet. Indeed, this file could be cre-
ated from the official host data base maintained at the Network Information Control Center (NIC), though local changes were often required
to bring it up to date regarding unofficial aliases and/or unknown hosts. The NIC no longer maintains the hosts.txt files, though looking
around at the time of writing (circa 2000), there are historical hosts.txt files on the WWW. I just found three, from 92, 94, and 95.
FILES
/etc/hosts
SEE ALSO
hostname(1) resolver(3), resolver(5), hosts(5), hostname(7), named(8), Internet RFC 952
AUTHOR
This manual page was written by Manoj Srivastava <srivasta@debian.org>, for the Debian GNU/Linux system.
Debian 2002-06-16 HOSTS(5)