[246c904] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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[6732c094] | 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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[246c904] | 4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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| 5 | %general-entities;
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[14d6b3e0] | 6 |
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[33e82b1] | 7 | <!ENTITY dhcpcd-download-http "https://roy.marples.name/downloads/dhcpcd/dhcpcd-&dhcpcd-version;.tar.xz">
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[4183f95] | 8 | <!-- <!ENTITY dhcpcd-download-ftp "ftp://roy.marples.name/pub/dhcpcd/dhcpcd-&dhcpcd-version;.tar.xz">-->
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| 9 | <!ENTITY dhcpcd-download-ftp " ">
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[f713df3] | 10 | <!ENTITY dhcpcd-md5sum "2b2f46648bc96979f96127f0e0e07d9b">
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| 11 | <!ENTITY dhcpcd-size "251 KB">
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[d301fdd] | 12 | <!ENTITY dhcpcd-buildsize "3.6 MB (with tests)">
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[e0a7d67c] | 13 | <!ENTITY dhcpcd-time "less than 0.1 SBU (with tests)">
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[246c904] | 14 | ]>
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[af652fc] | 15 | <!--
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| 16 | Use this URL as ChangeLog:
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[9cee0ec] | 17 | https://roy.marples.name/blog/dhcpcd-9-2-0-released.html
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| 18 | Substitute the 9-2-0 with 9-2-1 or 9-2-2 ...
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[f713df3] | 19 | pierre: seems that it now returns Error 404 (November 2021).
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[af652fc] | 20 | -->
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[246c904] | 21 |
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[fd680fb] | 22 | <sect1 id="dhcpcd" xreflabel="dhcpcd-&dhcpcd-version;">
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[820d164a] | 23 | <?dbhtml filename="dhcpcd.html"?>
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[4839c17] | 24 |
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[820d164a] | 25 | <sect1info>
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| 26 | <date>$Date$</date>
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| 27 | </sect1info>
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[4839c17] | 28 |
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[add19ff9] | 29 | <title>dhcpcd-&dhcpcd-version;</title>
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[4839c17] | 30 |
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[820d164a] | 31 | <indexterm zone="dhcpcd">
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[add19ff9] | 32 | <primary sortas="a-dhcpcd">dhcpcd</primary>
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[820d164a] | 33 | </indexterm>
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| 34 |
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| 35 | <sect2 role="package">
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[add19ff9] | 36 | <title>Introduction to dhcpcd</title>
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[820d164a] | 37 |
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[7c56ece] | 38 | <para>
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| 39 | <application>dhcpcd</application> is an implementation of the
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| 40 | DHCP client specified in RFC2131. A DHCP client is useful for connecting
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| 41 | your computer to a network which uses DHCP to assign network
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| 42 | addresses. dhcpcd strives to be a fully featured, yet very lightweight
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| 43 | DHCP client.
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| 44 | </para>
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[4839c17] | 45 |
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[7484ed9] | 46 | &lfs112_checked;
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[77ac0f23] | 47 |
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[820d164a] | 48 | <bridgehead renderas="sect3">Package Information</bridgehead>
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| 49 | <itemizedlist spacing="compact">
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| 50 | <listitem>
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[7c56ece] | 51 | <para>
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| 52 | Download (HTTP): <ulink url="&dhcpcd-download-http;"/>
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| 53 | </para>
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[820d164a] | 54 | </listitem>
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| 55 | <listitem>
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[7c56ece] | 56 | <para>
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| 57 | Download (FTP): <ulink url="&dhcpcd-download-ftp;"/>
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| 58 | </para>
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[820d164a] | 59 | </listitem>
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| 60 | <listitem>
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[7c56ece] | 61 | <para>
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| 62 | Download MD5 sum: &dhcpcd-md5sum;
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| 63 | </para>
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[820d164a] | 64 | </listitem>
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| 65 | <listitem>
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[7c56ece] | 66 | <para>
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| 67 | Download size: &dhcpcd-size;
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| 68 | </para>
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[820d164a] | 69 | </listitem>
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| 70 | <listitem>
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[7c56ece] | 71 | <para>
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| 72 | Estimated disk space required: &dhcpcd-buildsize;
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| 73 | </para>
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[820d164a] | 74 | </listitem>
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| 75 | <listitem>
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[7c56ece] | 76 | <para>
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| 77 | Estimated build time: &dhcpcd-time;
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| 78 | </para>
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[820d164a] | 79 | </listitem>
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| 80 | </itemizedlist>
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[4839c17] | 81 |
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[4edf8452] | 82 | <bridgehead renderas="sect3">dhcpcd Dependencies</bridgehead>
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| 83 |
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| 84 | <bridgehead renderas="sect4">Optional</bridgehead>
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| 85 | <para role="optional">
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[7c56ece] | 86 | <xref linkend="llvm"/> (with Clang),
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| 87 | <xref linkend="ntp"/>,
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| 88 | <ulink url="https://chrony.tuxfamily.org/">chronyd</ulink>, and
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| 89 | <ulink url="https://github.com/thkukuk/ypbind-mt/">ypbind</ulink>
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[4edf8452] | 90 | </para>
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| 91 |
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[7e1f3aa] | 92 | <para condition="html" role="usernotes">User Notes:
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| 93 | <ulink url="&blfs-wiki;/dhcpcd"/></para>
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| 94 |
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[820d164a] | 95 | </sect2>
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[4839c17] | 96 |
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[820d164a] | 97 | <sect2 role="installation">
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[add19ff9] | 98 | <title>Installation of dhcpcd</title>
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[820d164a] | 99 |
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[05c8448] | 100 | <para>
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[f8359b8] | 101 | Recent releases of <application>dhcpcd</application> implement privilege
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| 102 | separation. Additional installation steps are necessary to set up
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[05c8448] | 103 | the proper environment, which are performed by issuing the following
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| 104 | commands as the <systemitem class="username">root</systemitem> user:
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| 105 | </para>
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| 106 |
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| 107 | <screen role="root"><userinput>install -v -m700 -d /var/lib/dhcpcd &&
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| 108 |
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| 109 | groupadd -g 52 dhcpcd &&
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| 110 | useradd -c 'dhcpcd PrivSep' \
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| 111 | -d /var/lib/dhcpcd \
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| 112 | -g dhcpcd \
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| 113 | -s /bin/false \
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| 114 | -u 52 dhcpcd &&
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| 115 | chown -v dhcpcd:dhcpcd /var/lib/dhcpcd </userinput></screen>
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| 116 |
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[d16c71a] | 117 | <para>Fix a runtime error caused by a change in glibc-2.36:</para>
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| 118 |
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| 119 | <screen><userinput>sed '/Deny everything else/i SECCOMP_ALLOW(__NR_getrandom),' \
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| 120 | -i src/privsep-linux.c</userinput></screen>
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| 121 |
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[7c56ece] | 122 | <para>
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| 123 | Install <application>dhcpcd</application> by running the following
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| 124 | commands:
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| 125 | </para>
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[820d164a] | 126 |
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[e1d2da5] | 127 | <screen><userinput>./configure --prefix=/usr \
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| 128 | --sysconfdir=/etc \
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| 129 | --libexecdir=/usr/lib/dhcpcd \
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| 130 | --dbdir=/var/lib/dhcpcd \
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[f713df3] | 131 | --runstatedir=/run \
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[e1d2da5] | 132 | --privsepuser=dhcpcd &&
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[f0740ab] | 133 | make</userinput></screen>
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[f9a784a] | 134 |
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[7c56ece] | 135 | <para>
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| 136 | To test the results, issue: <command>make test</command>.
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| 137 | </para>
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[f9a784a] | 138 |
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[7c56ece] | 139 | <para>
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| 140 | Now, as the <systemitem class="username">root</systemitem> user:
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| 141 | </para>
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[f9a784a] | 142 |
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[bfa01156] | 143 | <screen role='root'><userinput>make install</userinput></screen>
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[4839c17] | 144 |
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[690658a5] | 145 | <!--
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[7c56ece] | 146 | <para>
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| 147 | By default, a plain text lease info file isn't created but the
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| 148 | <application>dhcpcd</application> provides a hook which can be used for
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| 149 | creating such a file. Install the hook by running the following commands
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| 150 | as the <systemitem class="username">root</systemitem> user:
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| 151 | </para>
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[232e46a] | 152 |
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[bfa01156] | 153 | <screen role='root'><userinput>sed -i "s;/var/lib;/run;g" dhcpcd-hooks/50-dhcpcd-compat &&
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[f9a784a] | 154 | install -v -m 644 dhcpcd-hooks/50-dhcpcd-compat /lib/dhcpcd/dhcpcd-hooks/</userinput></screen>
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[690658a5] | 155 | -->
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[4839c17] | 156 |
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[820d164a] | 157 | </sect2>
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[4839c17] | 158 |
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[690658a5] | 159 | <sect2 role="commands">
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| 160 | <title>Command Explanations</title>
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| 161 |
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| 162 | <para>
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[e1d2da5] | 163 | <parameter>--libexecdir=/usr/lib/dhcpcd</parameter>: Set a more proper
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| 164 | location for dhcpcd internal libraries.
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[690658a5] | 165 | </para>
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| 166 |
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| 167 | <para>
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[a3ec5c1] | 168 | <parameter>--dbdir=/var/lib/dhcpcd</parameter>: The default
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| 169 | <filename class="directory">/var/db</filename> is not FHS-compliant
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[690658a5] | 170 | </para>
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| 171 |
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[f713df3] | 172 | <para>
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| 173 | <parameter>--runstatedir=/run</parameter>: The default
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| 174 | <filename class="directory">/var/run</filename> is a symbolic
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| 175 | link to <filename class="directory">/run</filename>.
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| 176 | </para>
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| 177 |
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[690658a5] | 178 | <para>
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| 179 | <option>--with-hook=...</option>: You can optionally install more hooks,
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| 180 | for example to install some configuration files such as
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| 181 | <filename>ntp.conf</filename>. The set of hooks is in the
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| 182 | <filename class="directory">dhcpcd-hooks</filename> directory in the
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| 183 | build tree.
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| 184 | </para>
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| 185 | </sect2>
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| 186 |
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[820d164a] | 187 | <sect2 role="configuration">
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[add19ff9] | 188 | <title>Configuring dhcpcd</title>
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[820d164a] | 189 |
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| 190 | <sect3 id="dhcpcd-config">
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| 191 | <title>Config Files</title>
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[4839c17] | 192 |
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[7c56ece] | 193 | <para>
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| 194 | <filename>/etc/dhcpcd.conf</filename>
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| 195 | </para>
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[4839c17] | 196 |
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[820d164a] | 197 | <indexterm zone="dhcpcd dhcpcd-config">
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[fefa337] | 198 | <primary sortas="e-etc-dhcpcd-dhcpcd-conf">/etc/dhcpcd/dhcpcd.conf</primary>
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[820d164a] | 199 | </indexterm>
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[4839c17] | 200 |
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[820d164a] | 201 | </sect3>
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| 202 |
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[3c7bd00] | 203 | <sect3 id="dhcpcd-init" revision="sysv">
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[e5f38d6b] | 204 | <title>General Configuration Information</title>
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[820d164a] | 205 |
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[7c56ece] | 206 | <para>
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| 207 | To configure <command>dhcpcd</command>, you need to first install
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| 208 | the network service script,
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[e1d2da5] | 209 | <filename>/usr/lib/services/dhcpcd</filename>
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[7c56ece] | 210 | included in the <xref linkend="bootscripts"/> package
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| 211 | (as user <systemitem class="username">root</systemitem>):
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| 212 | </para>
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[4839c17] | 213 |
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[820d164a] | 214 | <indexterm zone="dhcpcd dhcpcd-init">
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| 215 | <primary sortas="f-dhcpcd">dhcpcd (service script)</primary>
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| 216 | </indexterm>
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| 217 |
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| 218 | <screen role='root'><userinput>make install-service-dhcpcd</userinput></screen>
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| 219 |
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[05c8448] | 220 | <note>
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| 221 | <para id="dhcpcd-config6">
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[e1d2da5] | 222 | the network service script <filename>/usr/lib/services/dhcpcd</filename>
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[05c8448] | 223 | contained in bootscripts up to blfs-bootscripts-20191204 is
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| 224 | not compatible with latest dhcpcd, as the location of the pidfile
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| 225 | changed.
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| 226 | To work around this, issue the following command:
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| 227 |
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| 228 | <screen role='root'><userinput>sed -i "s;/run/dhcpcd-;/run/dhcpcd/;g" /lib/services/dhcpcd</userinput></screen>
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| 229 | </para>
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| 230 | </note>
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| 231 |
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[7c56ece] | 232 | <note>
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| 233 | <para id="dhcpcd-config3">
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| 234 | The default for <command>dhcpcd</command> is to set the hostname
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| 235 | and mtu. It also overwrites <filename>/etc/resolv.conf </filename>
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| 236 | and <filename>/etc/ntp.conf</filename>. These
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| 237 | modifications to system files are done by hooks which are stored in
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[e1d2da5] | 238 | <filename class="directory">/usr/lib/dhcpcd/dhcpcd-hooks</filename>.
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[7c56ece] | 239 | Setup <command>dhcpcd</command> by removing or adding hooks from/to
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| 240 | that directory. The execution of hooks can be disabled by using
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| 241 | the <option>--nohook</option> (<option>-C</option>) command line
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| 242 | option or by the <option>nohook</option> option in the
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| 243 | <filename>/etc/dhcpcd.conf</filename> file.
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| 244 | </para>
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| 245 | </note>
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[232e46a] | 246 |
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[7c56ece] | 247 | <para id="dhcpcd-config2">
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| 248 | Finally, as the <systemitem class="username">root</systemitem> user
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| 249 | create the <filename>/etc/sysconfig/ifconfig.eth0</filename>
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| 250 | configuration file using the following commands. Adjust appropriately
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| 251 | for additional interfaces:
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| 252 | </para>
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[4839c17] | 253 |
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[820d164a] | 254 | <indexterm zone="dhcpcd dhcpcd-config2">
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[f0740ab] | 255 | <primary sortas="e-etc-sysconfig-dhcpcd">/etc/sysconfig/ifconfig.eth0 (dhcpcd)</primary>
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[820d164a] | 256 | </indexterm>
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| 257 |
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[f0740ab] | 258 | <screen role='root'><userinput>cat > /etc/sysconfig/ifconfig.eth0 << "EOF"
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[820d164a] | 259 | <literal>ONBOOT="yes"
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[f0740ab] | 260 | IFACE="eth0"
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[afa198d] | 261 | SERVICE="dhcpcd"
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[5aac2b97] | 262 | DHCP_START="-b -q <replaceable><insert appropriate start options here></replaceable>"
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[f0740ab] | 263 | DHCP_STOP="-k <replaceable><insert additional stop options here></replaceable>"</literal>
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[820d164a] | 264 | EOF</userinput></screen>
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| 265 |
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[7c56ece] | 266 | <para>
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| 267 | For more information on the appropriate <envar>DHCP_START</envar> and
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| 268 | <envar>DHCP_STOP</envar> values, examine the man page for
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| 269 | <command>dhcpcd</command>.
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| 270 | </para>
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[4839c17] | 271 |
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[820d164a] | 272 | <indexterm zone="dhcpcd dhcpcd-config3">
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| 273 | <primary sortas="e-etc-resolv.conf">/etc/resolv.conf</primary>
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| 274 | </indexterm>
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| 275 | </sect3>
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[4839c17] | 276 |
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[3c7bd00] | 277 | <sect3 id="dhcpcd-init2" revision="sysv">
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[e5f38d6b] | 278 | <title>Configuration Information: fixed ip</title>
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| 279 |
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[7c56ece] | 280 | <para id="dhcpcd-config4">
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| 281 | Although not usual, it is possible that you need
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[e5f38d6b] | 282 | to configure <application>dhcpcd</application> to use a fixed ip. Here,
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| 283 | we give an example. As the
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| 284 | <systemitem class="username">root</systemitem> user create the
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| 285 | <filename>/etc/sysconfig/ifconfig.eth0</filename> configuration file
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| 286 | using the following commands. Adjust appropriately for additional
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[7c56ece] | 287 | interfaces and for the actual ip and router you need:
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| 288 | </para>
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[e5f38d6b] | 289 |
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| 290 | <indexterm zone="dhcpcd dhcpcd-config4">
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| 291 | <primary sortas="e-etc-sysconfig-dhcpcd">/etc/sysconfig/ifconfig.eth0 (dhcpcd)</primary>
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| 292 | </indexterm>
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| 293 |
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[7c56ece] | 294 | <screen role='nodump'><userinput>cat > /etc/sysconfig/ifconfig.eth0 << "EOF"
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[e5f38d6b] | 295 | <literal>ONBOOT="yes"
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| 296 | IFACE="eth0"
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| 297 | SERVICE="dhcpcd"
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| 298 | DHCP_START="-b -q -S ip_address=192.168.0.10/24 -S routers=192.168.0.1"
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| 299 | DHCP_STOP="-k"</literal>
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| 300 | EOF</userinput></screen>
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| 301 |
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[7c56ece] | 302 | <para>
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| 303 | You can either use DNS servers in
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[0840866] | 304 | <filename>/etc/resolv.conf</filename> from another system, your
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| 305 | preferred servers, or just the example
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[7c56ece] | 306 | <filename>/etc/resolv.conf.head</filename> file below as is:
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| 307 | </para>
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[e5f38d6b] | 308 |
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[7c56ece] | 309 | <screen role='nodump'><userinput>cat > /etc/resolv.conf.head << "EOF"
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[e5f38d6b] | 310 | <literal># OpenDNS servers
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| 311 | nameserver 208.67.222.222
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| 312 | nameserver 208.67.220.220</literal>
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| 313 | EOF</userinput></screen>
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| 314 |
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| 315 | </sect3>
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| 316 |
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[138bdf6] | 317 | <sect3 id="dhcpcd-init3" revision="systemd">
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| 318 | <title>General Configuration Information</title>
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| 319 |
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| 320 | <para>
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| 321 | If you want to configure network interfaces at boot using
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| 322 | <command>dhcpcd</command>, you need to install the
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| 323 | systemd unit included in <xref linkend="systemd-units"/>
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| 324 | package by running the following command as the
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| 325 | <systemitem class="username">root</systemitem> user:
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| 326 | </para>
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| 327 |
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| 328 | <screen role="root"><userinput>make install-dhcpcd</userinput></screen>
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| 329 |
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| 330 | <indexterm zone="dhcpcd dhcpcd-init3">
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| 331 | <primary sortas="f-dhcpcd">dhcpcd</primary>
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| 332 | </indexterm>
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| 333 |
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| 334 | <note>
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[7c56ece] | 335 | <para id="dhcpcd-config5">
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| 336 | The default behavior of <command>dhcpcd</command> is to set the
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| 337 | hostname and the mtu. It also overwrites <filename>/etc/resolv.conf
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| 338 | </filename> and <filename>/etc/ntp.conf</filename>. These
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| 339 | modifications to system configuration files are done by hooks which
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| 340 | are stored in <filename class="directory">
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| 341 | /lib/dhcpcd/dhcpcd-hooks</filename>. Setup <command>dhcpcd</command>
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| 342 | by removing or adding hooks from/to that directory. The execution
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| 343 | of hooks can be disabled by using the <option>--nohook</option>
|
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| 344 | (<option>-C</option>) command line option or by the
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| 345 | <option>nohook</option> option in the <filename>/etc/dhcpcd.conf
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| 346 | </filename> file.
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| 347 | </para>
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[138bdf6] | 348 | </note>
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| 349 |
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| 350 | <indexterm zone="dhcpcd dhcpcd-config5">
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| 351 | <primary sortas="e-etc-resolv.conf">/etc/resolv.conf</primary>
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| 352 | </indexterm>
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| 353 |
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[7c56ece] | 354 | <note>
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| 355 | <para>
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| 356 | Make sure that you disable the <command>systemd-networkd</command>
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| 357 | service or configure it not to manage the interfaces you want to
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| 358 | manage with <application>dhcpcd</application>.
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| 359 | </para>
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| 360 | </note>
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[138bdf6] | 361 |
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| 362 | <para>
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| 363 | At this point you can test if <command>dhcpcd</command> is
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| 364 | behaving as expected by running the following command as the
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| 365 | <systemitem class="username">root</systemitem> user:
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| 366 | </para>
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| 367 |
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| 368 | <screen role="root"><userinput>systemctl start dhcpcd@<replaceable>eth0</replaceable></userinput></screen>
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| 369 |
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| 370 | <para>
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| 371 | To start <command>dhcpcd</command> on a specific interface
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| 372 | at boot, enable the previously installed systemd unit by
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| 373 | running the following command as the
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| 374 | <systemitem class="username">root</systemitem> user:
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| 375 | </para>
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| 376 |
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| 377 | <screen role="root"><userinput>systemctl enable dhcpcd@<replaceable>eth0</replaceable></userinput></screen>
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| 378 |
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| 379 | <para>
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| 380 | Replace <replaceable>eth0</replaceable> with the actual interface name.
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| 381 | </para>
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| 382 |
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| 383 | </sect3>
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| 384 |
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[820d164a] | 385 | </sect2>
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[4839c17] | 386 |
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[820d164a] | 387 | <sect2 role="content">
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| 388 | <title>Contents</title>
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| 389 |
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| 390 | <segmentedlist>
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| 391 | <segtitle>Installed Program</segtitle>
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[d81eda8] | 392 | <segtitle>Installed Library</segtitle>
|
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[b1d305ed] | 393 | <segtitle>Installed Directory</segtitle>
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[4839c17] | 394 |
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[820d164a] | 395 | <seglistitem>
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| 396 | <seg>dhcpcd</seg>
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[e1d2da5] | 397 | <seg>/usr/lib/dhcpcd/dev/udev.so</seg>
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| 398 | <seg>/{usr,var}/lib/dhcpcd and /usr/share/dhcpcd</seg>
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[820d164a] | 399 | </seglistitem>
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| 400 | </segmentedlist>
|
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[4839c17] | 401 |
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[820d164a] | 402 | <variablelist>
|
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| 403 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
|
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| 404 | <?dbfo list-presentation="list"?>
|
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| 405 | <?dbhtml list-presentation="table"?>
|
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[4839c17] | 406 |
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[820d164a] | 407 | <varlistentry id="dhcpcd-prog">
|
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| 408 | <term><command>dhcpcd</command></term>
|
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| 409 | <listitem>
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[7c56ece] | 410 | <para>
|
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[4c24eb0a] | 411 | is an implementation of the DHCP client specified in RFC2131
|
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[7c56ece] | 412 | </para>
|
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[820d164a] | 413 | <indexterm zone="dhcpcd dhcpcd-prog">
|
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| 414 | <primary sortas="b-dhcpcd">dhcpcd</primary>
|
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| 415 | </indexterm>
|
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| 416 | </listitem>
|
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| 417 | </varlistentry>
|
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[4839c17] | 418 |
|
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[81f1de4] | 419 | <varlistentry id="dhcpcd-udev">
|
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| 420 | <term><filename class="libraryfile">udev.so</filename></term>
|
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| 421 | <listitem>
|
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| 422 | <para>
|
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[c93c9bf4] | 423 | adds udev support for interface arrival and departure; this is
|
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[81f1de4] | 424 | because udev likes to rename the interface, which it can't do if
|
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[4c24eb0a] | 425 | dhcpcd grabs it first
|
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[81f1de4] | 426 | </para>
|
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| 427 | <indexterm zone="dhcpcd dhcpcd-udev">
|
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| 428 | <primary sortas="c-dhcpcd-udev">udev.so</primary>
|
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| 429 | </indexterm>
|
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| 430 | </listitem>
|
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| 431 | </varlistentry>
|
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| 432 |
|
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[820d164a] | 433 | </variablelist>
|
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| 434 |
|
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| 435 | </sect2>
|
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[f45b1953] | 436 |
|
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| 437 | </sect1>
|
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