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2 <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
3 <!ENTITY % general-entities SYSTEM "../general.ent">
6 <sect1 id="ch-scripts-hosts">
7 <title>Creating the /etc/hosts file</title>
8 <?dbhtml filename="hosts.html"?>
10 <indexterm zone="ch-scripts-hosts"><primary sortas="e-/etc/hosts">/etc/hosts</primary></indexterm>
12 <indexterm zone="ch-scripts-hosts">
13 <primary sortas="d-localnet">localnet</primary>
14 <secondary>/etc/hosts</secondary></indexterm>
16 <indexterm zone="ch-scripts-hosts">
17 <primary sortas="d-network">network</primary>
18 <secondary>/etc/hosts</secondary></indexterm>
20 <para>If a network card is to be configured, you have to decide on the
21 IP-address, FQDN and possible aliases for use in the /etc/hosts file. The
24 <screen><IP address> myhost.example.org aliases</screen>
26 <para>Unless your computer is to be visible to the Internet (e.g. you have a registered domain and a valid block of assigned IP addresses - most of us don't have this)you should make sure that the IP-address is in the private network
27 IP-address range. Valid ranges are:</para>
29 <screen> Class Networks
31 B 172.16.0.0 through 172.31.0.0
32 C 192.168.0.0 through 192.168.255.0</screen>
34 <para>A valid IP address could be 192.168.1.1. A valid FQDN for this IP could
35 be www.linuxfromscratch.org (not recommended as this is a valid registered domain address and could cause your domain name server problems).</para>
37 <para>If you aren't going to use a network card, you still need to
38 come up with a FQDN. This is necessary for certain programs to operate
41 <para>If a network card is not going to be configured, create the
42 <filename>/etc/hosts</filename> file by running:</para>
44 <screen><userinput>cat > /etc/hosts << "EOF"</userinput>
45 # Begin /etc/hosts (no network card version)
47 127.0.0.1 <value of HOSTNAME>.example.org <value of HOSTNAME> localhost
49 # End /etc/hosts (no network card version)
50 <userinput>EOF</userinput></screen>
52 <para>If a network card is to be configured, create the
53 <filename>/etc/hosts</filename> file by running:</para>
55 <screen><userinput>cat > /etc/hosts << "EOF"</userinput>
56 # Begin /etc/hosts (network card version)
59 192.168.1.1 <value of HOSTNAME>.example.org <value of HOSTNAME>
61 # End /etc/hosts (network card version)
62 <userinput>EOF</userinput></screen>
64 <para>Of course, the 192.168.1.1 and <value of HOSTNAME>.example.org
65 have to be changed to your liking (or requirements if assigned an IP-address
66 by a network/system administrator and this machine is planned to be connected
67 to an existing network).</para>