source: gnome/add/gdm.xml@ b0db915

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
   "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../../general.ent">
  %general-entities;

  <!ENTITY gdm-download-http "&gnome-download-http;/gdm/&gnome-version;/gdm-&gdm-version;.tar.bz2">
  <!ENTITY gdm-download-ftp  "&gnome-download-ftp;/gdm/&gnome-version;/gdm-&gdm-version;.tar.bz2">
  <!ENTITY gdm-md5sum        "e880558dc3574f804f3abca869992a4f">
  <!ENTITY gdm-size          "3.0 MB">
  <!ENTITY gdm-buildsize     "54.6 MB">
  <!ENTITY gdm-time          "0.6 SBU">
]>

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

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

  <title>GDM-&gdm-version;</title>

  <indexterm zone="gdm">
    <primary sortas="a-GDM">GDM</primary>
  </indexterm>

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

    <para>The <application>GDM</application> package contains
    <application>GNOME</application>'s Display Manager daemon. This is
    useful for allowing configurable graphical logins.</para>

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

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

    <bridgehead renderas="sect4">Required</bridgehead>
    <para role="required"><xref linkend="libgnomecanvas"/>,
    <xref linkend="gnome-doc-utils"/>, and
    <xref linkend="librsvg"/></para>

    <bridgehead renderas="sect4">Optional</bridgehead>
    <para role="optional"><xref linkend="intltool"/>,
    <xref linkend="zenity"/>,
    <xref linkend="linux-pam"/>,
    <xref linkend="tcpwrappers"/>, and
    <ulink url="http://www.openafs.org/">OpenAFS</ulink></para>

    <para>If you configure <application>GDM</application> to offer secure
    connections to remote machines, you will need to have
    <xref linkend="zenity"/>, <xref linkend="openssh"/> and
    <xref linkend="which"/> installed.</para>

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

  </sect2>

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

    <para>It is recommended to have a dedicated user and group to take
    control of the <command>gdm-binary</command> daemon after it is
    started. Issue the following commands as the
    <systemitem class="username">root</systemitem> user:</para>

<screen role='root'><userinput>groupadd -g 21 gdm &amp;&amp;
useradd -c "GDM Daemon Owner" -d /dev/null \
        -g gdm -s /bin/bash -u 21 gdm</userinput></screen>

    <para>Install <application>GDM</application> by running
    the following commands as an unprivileged user:</para>

<screen><userinput>./configure --prefix=$(pkg-config --variable=prefix ORBit-2.0) \
            --sysconfdir=&gnome-etc-dir; \
            --localstatedir=/var/lib \
            --libexecdir=$(pkg-config \
                --variable=prefix ORBit-2.0)/lib/gdm \
            --mandir=$(pkg-config \
                --variable=prefix ORBit-2.0)/share/man \
            --with-pam-prefix=/etc &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>

  </sect2>

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

    <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
    href="../../xincludes/gnome-prefix.xml"/>

    <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
    href="../../xincludes/gnome-sysconfdir.xml"/>

    <para><parameter>--localstatedir=/var/lib</parameter>: This command
    puts files in <filename class="directory">/var/lib</filename> instead of
    <filename class="directory">$GNOME_PREFIX/var</filename>. This also has
    the downside affect of using
    <filename class='directory'>/var/lib/log/gdm</filename> as the log
    directory. See the <quote>Configuration Information</quote> section below
    for instructions on relocating the log file directory.</para>

    <para><parameter>--libexecdir=$(pkg-config
    --variable=prefix ORBit-2.0)/lib/gdm</parameter>: This parameter is
    used so that the <application>GDM</application> internal support programs
    are installed in the preferred location of
    <filename class='directory'>$GNOME_PREFIX/lib/gdm</filename> instead
    of <filename class='directory'>$GNOME_PREFIX/libexec</filename>.</para>

    <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
    href="../../xincludes/gnome-mandir.xml"/>

    <para><parameter>--with-pam-prefix=/etc</parameter>: This command puts
    <application>PAM</application> configuration files in
    <filename class="directory">/etc/pam.d</filename> instead of
    <filename class="directory">&gnome-etc-dir;</filename>.</para>

  </sect2>

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

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

      <para><filename>&gnome-etc-dir;/gdm/custom.conf</filename>,
      <filename>$GNOME_PREFIX/share/gdm/defaults.conf</filename></para>

      <indexterm zone="gdm gdm-config">
        <primary sortas="e-etc-gnome-&gnome-version;&gnome-minor-version;gdm-custom.conf">
        &gnome-etc-dir;/gdm/custom.conf</primary>
      </indexterm>
      <indexterm zone="gdm gdm-config">
        <primary sortas="e-$GNOME_PREFIX-share-gdm-defaults.conf">
        $GNOME_PREFIX/share/gdm/defaults.conf</primary>
      </indexterm>

    </sect3>

    <sect3>
      <title>Configuration Information</title>

      <para>Starting with the 2.14.x version of GNOME, the default
      configuration parameters are stored in a static file
      (<filename><envar>$GNOME_PREFIX</envar>/share/gdm/defaults.conf</filename>).
      This file is not intended to be edited. If modification of the
      configuration is necessary, you should add parameters to the
      <filename>&gnome-etc-dir;/gdm/custom.conf</filename> file. The settings
      in this file will override the settings in the static file. The same
      parameters in the static file are used in the configuration file.</para>

      <para>Change the directory containing the <application>GDM</application>
      log files to the <filename class='directory'>/var/log</filename>
      hierarchy by creating a directory and modifying the
      <filename>&gnome-etc-dir;/gdm/custom.conf</filename> configuration file. Issue
      the following commands as the
      <systemitem class="username">root</systemitem> user:</para>

<screen role="root"><userinput>install -v -m755 -d /var/log/gdm &amp;&amp;
sed -i.orig "/\[daemon\]/ a LogDir=/var/log/gdm" \
    &gnome-etc-dir;/gdm/custom.conf &amp;&amp;
rmdir -v /var/lib/log/gdm &amp;&amp;
rmdir -v /var/lib/log</userinput></screen>

      <para>The <application>GDM</application> <application>PAM</application>
      configuration files contain modules not present in a BLFS installation.
      If you have <application>PAM</application> installed, issue the following
      commands as the <systemitem class="username">root</systemitem> user to
      replace those files with files containing correctly specified
      modules:</para>

<screen role="root"><userinput>cat &gt; /etc/pam.d/gdm &lt;&lt; "EOF"
<literal>auth        required    pam_unix.so
auth        required    pam_nologin.so
account     required    pam_unix.so
password    required    pam_unix.so
session     required    pam_unix.so</literal>

EOF
cat &gt; /etc/pam.d/gdm-autologin &lt;&lt; "EOF"
<literal>auth        required    pam_env.so
auth        required    pam_nologin.so
auth        required    pam_permit.so
account     required    pam_unix.so
password    required    pam_unix.so
session     required    pam_unix.so</literal>

EOF</userinput></screen>

      <indexterm zone="gdm gdm-config">
        <primary sortas="e-etc-pam.d-gdm">/etc/pam.d/gdm</primary>
      </indexterm>
      <indexterm zone="gdm gdm-config">
        <primary
        sortas="e-etc-pam.d-gdm-autologin">/etc/pam.d/gdm-autologin</primary>
      </indexterm>

      <para id="gdm-config-dbus">If you have <application>D-BUS</application>
      installed and you want to start the session
      <application>D-BUS</application> daemon when you start the GNOME desktop
      environment using <command>gdm</command>, you'll need to create a new
      Xsession file. Create the file using the following command as the root
      user.</para>

<screen role="root"><userinput>cat &gt; $GNOME_PREFIX/share/xsessions/gnome-dbus.desktop &lt;&lt; "EOF"
<literal>[Desktop Entry]
Encoding=UTF-8
Name=GNOME with D-BUS
Comment=GNOME Desktop with D-BUS support
Exec=dbus-launch --exit-with-session gnome-session
TryExec=/usr/bin/dbus-launch
Icon=
Type=Application</literal>

EOF
chmod -v 644 $GNOME_PREFIX/share/xsessions/gnome-dbus.desktop</userinput></screen>

      <para>Choose this session using the session selection dialog on the
      display manager login screen. You also have the opportunity to make this
      your default session.</para>

      <note>
        <para>You may use the <filename class='extension'>.desktop</filename>
        file created above as an example to create additional
        <filename class='extension'>.desktop</filename> files and add any other
        desired items to the <application>GDM</application> display manager session
        selection menu.</para>
      </note>

      <para><command>gdm</command> can be tested by executing it as the
      <systemitem class="username">root</systemitem> user. Use the
      <command>gdm-stop</command> command if you wish to stop the display
      manager.</para>

    </sect3>

    <sect3 id="gdm-init">
      <title>Boot Script</title>

      <para>To start a graphical login when the system is booted, install the
      <filename>/etc/rc.d/init.d/gdm</filename> init script included in the
      <xref linkend="bootscripts"/> package. If your
      <envar>GNOME_PREFIX</envar> environment variable is anything other than
      <filename class='directory'>/usr</filename> or <filename
      class='directory'>/opt/gnome-&gnome-version;&gnome-minor-version;</filename>,
      you will need to modify the <envar>PATH</envar> statement in the script
      to include the path where you have <application>GNOME</application>
      installed.</para>

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

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

      <para>Now edit <filename>/etc/inittab</filename> so that the line
      containing:</para>

<screen><literal>id:3:initdefault:</literal></screen>

      <para>is changed to:</para>

<screen><literal>id:5:initdefault:</literal></screen>

    </sect3>

  </sect2>

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

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

      <seglistitem>
        <seg>gdm, gdm-binary, gdm-dmx-reconnect-proxy, gdm-restart,
        gdm-safe-restart, gdm-stop, gdmXnest, gdmXnestchooser, gdmdynamic,
        gdmflexiserver, gdmphotosetup, gdmsetup, and gdmthemetester</seg>
        <seg>lib*mouselistener.{so,a} GTK+ modules</seg>
        <seg>&gnome-etc-dir;/{,g}dm,
        /var/lib/gdm,
        /var/log/gdm and the following directories in
        <envar>$GNOME_PREFIX</envar>/:
        share/{,gnome/help/ ,omf/}gdm</seg>
      </seglistitem>
    </segmentedlist>

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

      <varlistentry id="gdm-prog">
        <term><command>gdm</command></term>
        <listitem>
          <para>is a wrapper script to execute the
          <application>GDM</application> binary, the configurable
          <application>GNOME</application> based login prompt.</para>
          <indexterm zone="gdm gdm-prog">
            <primary sortas="b-gdm">gdm</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gdm-restart">
        <term><command>gdm-restart</command></term>
        <listitem>
          <para>sends the HUP signal to the <application>GDM</application>
          daemon so that it restarts. It's used after the config file
          is edited</para>
          <indexterm zone="gdm gdm-restart">
            <primary sortas="b-gdm-restart">gdm-restart</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gdm-safe-restart">
        <term><command>gdm-safe-restart</command></term>
        <listitem>
          <para>sends the USR1 signal to the <application>GDM</application>
          daemon so that it restarts. It's used after the config file
          is edited.</para>
          <indexterm zone="gdm gdm-safe-restart">
            <primary sortas="b-gdm-safe-restart">gdm-safe-restart</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gdmsetup">
        <term><command>gdmsetup</command></term>
        <listitem>
          <para>is a graphical interface to edit the
          <filename>gdm.conf</filename> file.</para>
          <indexterm zone="gdm gdmsetup">
            <primary sortas="b-gdmsetup">gdmsetup</primary>
          </indexterm>
        </listitem>
      </varlistentry>
    </variablelist>

  </sect2>

</sect1>