source: networking/connect/dhcpcd-systemd.xml@ 032be17

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
   "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../../general.ent">
  %general-entities;

  <!ENTITY dhcpcd-download-http "http://roy.marples.name/downloads/dhcpcd/dhcpcd-&dhcpcd-version;.tar.bz2">
  <!ENTITY dhcpcd-download-ftp  " ">
  <!--<!ENTITY dhcpcd-download-ftp  "ftp://ftp.osuosl.org/pub/gentoo/distfiles/dhcpcd-&dhcpcd-version;.tar.bz2">-->
  <!ENTITY dhcpcd-md5sum        "6a421a8b0f19dbcbfca25e64a8ba76f3">
  <!ENTITY dhcpcd-size          "156 KB">
  <!ENTITY dhcpcd-buildsize     "2.3 MB">
  <!ENTITY dhcpcd-time          "less than 0.1 SBU">
]>

<sect1 id="dhcpcd" xreflabel="dhcpcd-&dhcpcd-version;">
  <?dbhtml filename="dhcpcd.html"?>

  <sect1info>
    <othername>$LastChangedBy$</othername>
    <date>$Date$</date>
  </sect1info>

  <title>dhcpcd-&dhcpcd-version;</title>

  <indexterm zone="dhcpcd">
    <primary sortas="a-dhcpcd">dhcpcd</primary>
  </indexterm>

  <sect2 role="package">
    <title>Introduction to dhcpcd</title>

    <para><application>dhcpcd</application> is an implementation of the
    DHCP client specified in RFC2131. A DHCP client is useful for connecting
    your computer to a network which uses DHCP to assign network
    addresses. dhcpcd strives to be a fully featured, yet very lightweight
    DHCP client.</para>

    &lfs76_checked;

    <note>
      <para>
        Make sure that you disable the <command>systemd-networkd</command> service
        or configure it not to manage the interfaces you want to manage with
        <application>dhcpcd</application>.
      </para>
    </note>

    <bridgehead renderas="sect3">Package Information</bridgehead>
    <itemizedlist spacing="compact">
      <listitem>
        <para>Download (HTTP): <ulink url="&dhcpcd-download-http;"/></para>
      </listitem>
      <listitem>
        <para>Download (FTP): <ulink url="&dhcpcd-download-ftp;"/></para>
      </listitem>
      <listitem>
        <para>Download MD5 sum: &dhcpcd-md5sum;</para>
      </listitem>
      <listitem>
        <para>Download size: &dhcpcd-size;</para>
      </listitem>
      <listitem>
        <para>Estimated disk space required: &dhcpcd-buildsize;</para>
      </listitem>
      <listitem>
        <para>Estimated build time: &dhcpcd-time;</para>
      </listitem>
    </itemizedlist>

    <bridgehead renderas="sect3">dhcpcd Dependencies</bridgehead>

    <bridgehead renderas="sect4">Optional</bridgehead>
    <para role="optional">
      <xref linkend="llvm"/> (with Clang)
    </para>

    <para condition="html" role="usernotes">User Notes:
    <ulink url="&blfs-wiki;/dhcpcd"/></para>

  </sect2>

  <sect2 role="installation">
    <title>Installation of dhcpcd</title>

    <para>
      First, silence a lot of warnings caused by using the latest toolchain
      by running the following command:
    </para>

<screen><userinput>sed -i "s:BSD_SOURCE:DEFAULT_SOURCE:g" configure</userinput></screen>

    <para>Install <application>dhcpcd</application> by running the following
    commands:</para>

<screen><userinput>./configure --libexecdir=/lib/dhcpcd \
            --dbdir=/var/tmp         &amp;&amp;
make</userinput></screen>

    <para>This package does not come with a test suite.</para>

    <para>Now, as the <systemitem class="username">root</systemitem> user:</para>

<screen role='root'><userinput>make install</userinput></screen>

<!--
    <para>By default, a plain text lease info file isn't created but the
    <application>dhcpcd</application> provides a hook which can be used for creating
    such a file. Install the hook by running the following
    commands as the <systemitem class="username">root</systemitem> user:</para>

<screen role='root'><userinput>sed -i "s;/var/lib;/run;g" dhcpcd-hooks/50-dhcpcd-compat &amp;&amp;
install -v -m 644 dhcpcd-hooks/50-dhcpcd-compat /lib/dhcpcd/dhcpcd-hooks/</userinput></screen>
-->

  </sect2>

  <sect2 role="commands">
    <title>Command Explanations</title>

    <para>
      <parameter>--libexecdir=/lib/dhcpcd</parameter>: The default
      <filename class="directory">/libexec</filename> is not FHS-compliant.
      Since this directory may need to be available early in the boot,
      <filename class="directory">/usr/libexec</filename> cannot be used either.
    </para>

    <para>
      <parameter>--dbdir=/var/tmp</parameter>: The default
      <filename class="directory">/var/lib</filename> is not FHS-compliant
    </para>

    <para>
      <option>--with-hook=...</option>: You can optionally install more hooks,
      for example to install some configuration files such as
      <filename>ntp.conf</filename>. The set of hooks is in the
      <filename class="directory">dhcpcd-hooks</filename> directory in the
      build tree.
    </para>
  </sect2>

  <sect2 role="configuration">
    <title>Configuring dhcpcd</title>

    <sect3 id="dhcpcd-config">
      <title>Config Files</title>

      <para><filename>/etc/dhcpcd.conf</filename></para>

      <indexterm zone="dhcpcd dhcpcd-config">
        <primary sortas="e-etc-dhcpcd-dhcpcd-conf">/etc/dhcpcd/dhcpcd.conf</primary>
      </indexterm>

    </sect3>

    <sect3 id="dhcpcd-init">
      <title>General Configuration Information</title>

      <para>
        If you want to configure network interfaces at boot using
        <command>dhcpcd</command>, you need to install the
        systemd unit included in <xref linkend="bootscripts"/>
        package by running the following command as the
        <systemitem class="username">root</systemitem> user:
      </para>

<screen role="root"><userinput>make install-dhcpcd</userinput></screen>

      <indexterm zone="dhcpcd dhcpcd-init">
        <primary sortas="f-dhcpcd">dhcpcd</primary>
      </indexterm>

      <para>
        Whenever <command>dhcpcd</command> configures or shuts down
        a network interface, it executes hook scripts. For more details
        about those scripts, see the <command>dhcpcd-run-hooks</command> and
        <command>dhcpcd</command> man pages.
      </para>

      <note>
        <para id="dhcpcd-config3">
          The default behavior of <command>dhcpcd</command> sets the
          hostname and mtu settings. It also overwrites
          <filename>/etc/resolv.conf</filename> and
          <filename>/etc/ntp.conf</filename>.

          These modifications to system files and settings on system
          configuration files are done by hooks which are stored in
          <filename class="directory">/lib/dhcpcd/dhcpcd-hooks</filename>.

          Setup <command>dhcpcd</command> by removing or adding hooks from/to
          that directory.  The execution of hooks can be disabled by using the
          <option>--nohook</option> (<option>-C</option>) command line option or
          by the <option>nohook</option> option in the
          <filename>/etc/dhcpcd.conf</filename> file.
        </para>
      </note>

      <indexterm zone="dhcpcd dhcpcd-config3">
        <primary sortas="e-etc-resolv.conf">/etc/resolv.conf</primary>
      </indexterm>

      <para>
        At this point you can test if <command>dhcpcd</command> is
        behaving as expected by running the following command as the
        <systemitem class="username">root</systemitem> user:
      </para>

<screen role="root"><userinput>systemctl start dhcpcd@<replaceable>eth0</replaceable></userinput></screen>

      <para>
        To start <command>dhcpcd</command> on a specific interface
        at boot, enable the previously installed systemd unit by
        running the following command as the
        <systemitem class="username">root</systemitem> user:
      </para>

<screen role="root"><userinput>systemctl enable dhcpcd@<replaceable>eth0</replaceable></userinput></screen>

      <para>
        Replace <replaceable>eth0</replaceable> with the actual interface name.
      </para>

    </sect3>

  </sect2>

  <sect2 role="content">
    <title>Contents</title>

    <segmentedlist>
      <segtitle>Installed Programs</segtitle>
      <segtitle>Installed Libraries</segtitle>
      <segtitle>Installed Directories</segtitle>

      <seglistitem>
        <seg>dhcpcd</seg>
        <seg>None</seg>
        <seg>/lib/dhcpcd</seg>
      </seglistitem>
    </segmentedlist>

    <variablelist>
      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
      <?dbfo list-presentation="list"?>
      <?dbhtml list-presentation="table"?>

      <varlistentry id="dhcpcd-prog">
        <term><command>dhcpcd</command></term>
        <listitem>
          <para>is an implementation of the DHCP client specified
          in RFC2131.</para>
          <indexterm zone="dhcpcd dhcpcd-prog">
            <primary sortas="b-dhcpcd">dhcpcd</primary>
          </indexterm>
        </listitem>
      </varlistentry>

    </variablelist>

  </sect2>

</sect1>