BOOK/chapter06/config-glibc.xml

   1 <sect2><title>&nbsp;</title><para>&nbsp;</para></sect2>
   2
   3 <sect2><title>Configuring Glibc</title>
   4
   5 <para>We need to create the <filename>/etc/nsswitch.conf</filename> file,
   6 because, although Glibc provides defaults when this file is missing or corrupt,
   7 the Glibc defaults don't work well with networking. Also, our time zone needs
   8 to be set up.</para>
   9
  10 <para>Create a new file <filename>/etc/nsswitch.conf</filename> by running the
  11 following:</para>
  12
  13 <screen><userinput>cat &gt; /etc/nsswitch.conf &lt;&lt; "EOF"</userinput>
  14 # Begin /etc/nsswitch.conf
  15
  16 passwd: files
  17 group: files
  18 shadow: files
  19
  20 publickey: files
  21
  22 hosts: files dns
  23 networks: files
  24
  25 protocols: db files
  26 services: db files
  27 ethers: db files
  28 rpc: db files
  29
  30 netgroup: db files
  31
  32 # End /etc/nsswitch.conf
  33 <userinput>EOF</userinput></screen>
  34
  35 <para>To find out what time zone you're in, run the following script:</para>
  36
  37 <screen><userinput>tzselect</userinput></screen>
  38
  39 <para>When you've answered a few questions about your location, the script will
  40 output the name of your time zone, something like <emphasis>EST5EDT</emphasis>
  41 or <emphasis>Canada/Eastern</emphasis>. Then create the
  42 <filename>/etc/localtime</filename> file by running:</para>
  43
  44 <screen><userinput>cp --remove-destination /usr/share/zoneinfo/Canada/Eastern /etc/localtime</userinput></screen>
  45
  46 <para>The meaning of the option:</para>
  47
  48 <itemizedlist>
  49 <listitem><para><userinput>--remove-destination</userinput>: This is needed to
  50 force removal of the already existing symbolic link. The reason why we copy
  51 instead of symlink is to cover the situation where <filename>/usr</filename> is
  52 on a separate partition. This could matter, for example, when booted into single
  53 user mode.</para></listitem>
  54 </itemizedlist>
  55
  56 <para>Of course, instead of <emphasis>Canada/Eastern</emphasis>, fill in
  57 the name of the time zone that the <command>tzselect</command> script
  58 gave you.</para>
  59
  60 </sect2>
  61
  62 <sect2><title>&nbsp;</title><para>&nbsp;</para></sect2>
  63
  64 <sect2>
  65 <title>Configuring Dynamic Loader</title>
  66
  67 <para>By default, the dynamic loader
  68 (<filename>/lib/ld-linux.so.2</filename>) searches through <filename
  69 class="directory">/lib</filename> and <filename
  70 class="directory">/usr/lib</filename> for dynamic libraries that are needed
  71 by programs when you run them. However, if there are libraries in
  72 directories other than <filename class="directory">/lib</filename> and
  73 <filename class="directory">/usr/lib</filename>, you need to add them to
  74 the <filename>/etc/ld.so.conf</filename> file for the dynamic
  75 loader to find them. Two directories that are commonly known to contain
  76 additional libraries are <filename
  77 class="directory">/usr/local/lib</filename> and <filename
  78 class="directory">/opt/lib</filename>, so we add those directories to the
  79 dynamic loader's search path.</para>
  80
  81 <para>Create a new file <filename>/etc/ld.so.conf</filename> by running the
  82 following:</para>
  83
  84 <screen><userinput>cat &gt; /etc/ld.so.conf &lt;&lt; "EOF"</userinput>
  85 # Begin /etc/ld.so.conf
  86
  87 /usr/local/lib
  88 /opt/lib
  89
  90 # End /etc/ld.so.conf
  91 <userinput>EOF</userinput></screen>
  92
  93 </sect2>
  94