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git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@1776 af4574ff-66df-0310-9fd7-8a98e5e911e0
102 lines
4.2 KiB
XML
102 lines
4.2 KiB
XML
<sect1 id="dhcpclient" xreflabel="Configuring the LFS bootscripts to support DHCP clients">
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<?dbhtml filename="configdhcp.html" dir="connect"?>
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<title>Configuring the <acronym>LFS</acronym> bootscripts to support <acronym>DHCP</acronym> clients</title>
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<sect2><title>Config files</title>
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<para><filename>/etc/sysconfig/network</filename>,
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<filename>/etc/sysconfig/network-devices/ifup-eth0</filename>,
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<filename>/etc/sysconfig/network-devices/ifdown-eth0</filename>,
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<filename>/etc/sysconfig/network-devices/ifconfig.eth0</filename></para>
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</sect2>
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<sect2><title>Configuration Information</title>
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<para>Note that on this and the following pages, we
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use <emphasis role="strong">eth0</emphasis> as the example interface.
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If you want to configure a different (or more than one) interface, simply
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replace <emphasis role="strong">eth0</emphasis> with the interface you wish to
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use.</para>
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<para>These instructions will convert the configuration files from
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<acronym>LFS</acronym> (a static configuration) to a configuration using the
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<acronym>DHCP</acronym> protocol. Note that static and
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<acronym>DHCP</acronym>-based interfaces can co-exist on a
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<acronym>LFS</acronym> system. To do this, you should only make the
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alterations to those interfaces which need to support
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<acronym>DHCP</acronym>. All of the instructions on this page are applicable
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no matter which <acronym>DHCP</acronym> client you intend to use.</para>
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<para>If the interface you intend to use as your default gateway is going to
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use <acronym>DHCP</acronym>, the first step is to remove the <envar>GATEWAY
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</envar> and <envar>GATEWAY_IF</envar> variables
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from <filename>/etc/sysconfig/network</filename>. This will only need to be
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done once.</para>
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<screen><userinput><command>cd /etc/sysconfig &&
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cp network network.bak &&
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sed "s/GATEWAY/# GATEWAY/" network.bak > network</command></userinput></screen>
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<para>You then need to create scripts which will override the default
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network scripts and provide <acronym>DHCP</acronym> support. These two scripts
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are generic and so for use with both <acronym>DHCP</acronym> clients. First,
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the <filename>ifup-eth0</filename> script:</para>
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<screen><userinput><command>cat > /etc/sysconfig/network-devices/ifup-eth0 << "EOF" </command>
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#!/bin/sh
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. /etc/sysconfig/rc || exit
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. $rc_functions || exit
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. $network_devices/ifconfig.eth0 || exit
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echo "Bringing up the eth0 interface..."
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modprobe eth0
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loadproc $DHCP_PROG $DHCP_START
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<command>EOF</command></userinput></screen>
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<para>Then the <filename>ifdown-eth0</filename> script:</para>
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<screen><userinput><command>cat > /etc/sysconfig/network-devices/ifdown-eth0 << "EOF" </command>
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#!/bin/sh
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. /etc/sysconfig/rc || exit
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. $rc_functions || exit
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. $network_devices/ifconfig.eth0 || exit
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echo "Bringing down the eth0 interface..."
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$DHCP_PROG $DHCP_STOP
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evaluate_retval
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<command>EOF</command></userinput></screen>
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<para>Next, we need to make corrections to the
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<filename>/etc/hosts</filename> file. Be sure to replace
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<emphasis role="strong">HOSTNAME</emphasis> and
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<emphasis role="strong">DOMAIN_NAME</emphasis> with apropriate values.</para>
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<screen><userinput><command>mv -f /etc/hosts /etc/hosts.bak &&
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cat > /etc/hosts << "EOF" </command>
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# Begin /etc/hosts
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127.0.0.1 HOSTNAME HOSTNAME.DOMAIN_NAME localhost localhost.localdomain
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# End /etc/hosts
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<command>EOF</command></userinput></screen>
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<para>Finally, we need to make the scripts executable:</para>
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<screen><userinput><command>chmod 755 /etc/sysconfig/network-devices/ifup-eth0 &&
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chmod 755 /etc/sysconfig/network-devices/ifdown-eth0</command></userinput></screen>
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<warning><para>This script, in its current state,
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<emphasis>will</emphasis> cause an error at shutdown. At the moment, it
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is best to just live with the error. The network scripts for
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<acronym>LFS</acronym> and <acronym>BLFS</acronym> are currently being
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revised. In the interim, you can use a simple workaround to rid yourself
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of the error. Move your <filename>K80network</filename> stop scripts to
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<filename>K49network</filename>. You must be absolutely certain,
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however, that you have all network filesystems unmounted before this
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script is executed.</para></warning>
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</sect2>
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</sect1>
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