source: connect/dhcp/bootscripts.xml@ 4cdfb1b

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Last change on this file since 4cdfb1b was 4cdfb1b, checked in by Igor Živković <igor@…>, 18 years ago

corrected few typos and formatting in DHCP section

git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@1623 af4574ff-66df-0310-9fd7-8a98e5e911e0

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1<sect1 id="dhcpclient" xreflabel="Configuring the LFS bootscripts to support DHCP clients">
2<?dbhtml filename="configdhcp.html" dir="connect"?>
3<title>Configuring the <acronym>LFS</acronym> bootscripts to support <acronym>DHCP</acronym> clients</title>
4
5<sect2><title>Config files</title>
6<para><filename>/etc/sysconfig/network</filename>,
7<filename>/etc/sysconfig/network-devices/ifup-eth0</filename>,
8<filename>/etc/sysconfig/network-devices/ifdown-eth0</filename>,
9<filename>/etc/sysconfig/network-devices/ifconfig.eth0</filename></para>
10</sect2>
11
12<sect2><title>Configuration Information</title>
13
14<para>Note that on this and the following pages, we
15use <emphasis role="strong">eth0</emphasis> as the example interface.
16If you want to configure a different (or more than one) interface, simply
17replace <emphasis role="strong">eth0</emphasis> with the interface you wish to
18use.</para>
19
20<para>These instructions will convert the configuration files from
21<acronym>LFS</acronym> (a static configuration) to a configuration using the
22<acronym>DHCP</acronym> protocol. Note that static and
23<acronym>DHCP</acronym>-based interfaces can co-exist on a
24<acronym>LFS</acronym> system. To do this, you should only make the
25alterations to those interfaces which need to support
26<acronym>DHCP</acronym>. All of the instructions on this page are applicable
27no matter which <acronym>DHCP</acronym> client you intend to use.</para>
28
29<para>If the interface you intend to use as your default gateway is going to
30use <acronym>DHCP</acronym>, the first step is to remove the <envar>GATEWAY
31</envar> and <envar>GATEWAY_IF</envar> variables
32from <filename>/etc/sysconfig/network</filename>. This will only need to be
33done once.</para>
34
35<screen><userinput><command>cd /etc/sysconfig &amp;&amp;
36cp network network.bak &amp;&amp;
37sed "s/GATEWAY/# GATEWAY/" network.bak > network</command></userinput></screen>
38
39<para>You then need to create scripts which will override the default
40network scripts and provide <acronym>DHCP</acronym> support. These two scripts
41are generic and so for use with both <acronym>DHCP</acronym> clients. First,
42the <filename>ifup-eth0</filename> script:</para>
43
44<screen><userinput><command>cat &gt; /etc/sysconfig/network-devices/ifup-eth0 &lt;&lt; "EOF" </command>
45#!/bin/sh
46
47source /etc/sysconfig/rc || exit
48source $rc_functions || exit
49source $network_devices/ifconfig.eth0 || exit
50
51echo "Bringing up the eth0 interface..."
52modprobe eth0
53loadproc $DHCP_PROG $DHCP_START
54<command>EOF</command></userinput></screen>
55
56<para>Then the <filename>ifdown-eth0</filename> script:</para>
57
58<screen><userinput><command>cat &gt; /etc/sysconfig/network-devices/ifdown-eth0 &lt;&lt; "EOF" </command>
59#!/bin/sh
60
61source /etc/sysconfig/rc || exit
62source $rc_functions || exit
63source $network_devices/ifconfig.eth0 || exit
64
65echo "Bringing down the eth0 interface..."
66$DHCP_PROG $DHCP_STOP
67evaluate_retval
68<command>EOF</command></userinput></screen>
69
70<para>Next, we need to make corrections to the
71<filename>/etc/hosts</filename> file. Be sure to replace
72<emphasis role="strong">HOSTNAME</emphasis> and
73<emphasis role="strong">DOMAIN_NAME</emphasis> with apropriate values.</para>
74
75<screen><userinput><command>mv -f /etc/hosts /etc/hosts.bak &amp;&amp;
76cat &gt; /etc/hosts &lt;&lt; "EOF" </command>
77# Begin /etc/hosts
78
79127.0.0.1 HOSTNAME HOSTNAME.DOMAIN_NAME localhost localhost.localdomain
80
81# End /etc/hosts
82<command>EOF</command></userinput></screen>
83
84<para>Finally, we need to make the scripts executable:</para>
85
86<screen><userinput><command>chmod 755 /etc/sysconfig/network-devices/ifup-eth0 &amp;&amp;
87chmod 755 /etc/sysconfig/network-devices/ifdown-eth0</command></userinput></screen>
88
89<warning><para>This script, in its current state,
90<emphasis>will</emphasis> cause an error at shutdown. At the moment, it
91is best to just live with the error. The network scripts for
92<acronym>LFS</acronym> and <acronym>BLFS</acronym> are currently being
93revised. In the interim, you can use a simple workaround to rid yourself
94of the error. Move your <filename>K80network</filename> stop scripts to
95<filename>K49network</filename>. You must be absolutely certain,
96however, that you have all network filesystems unmounted before this
97script is executed.</para></warning>
98
99</sect2>
100
101</sect1>
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