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authorMatthew Burgess <matthew@linuxfromscratch.org>2004-05-03 10:59:46 +0000
committerMatthew Burgess <matthew@linuxfromscratch.org>2004-05-03 10:59:46 +0000
commit673b0d84ba9591e07c0bdf0ee49d92eba10f502c (patch)
tree129e27a1450727b440da4378e0117a468eb9c25e /chapter06/pwdgroup.xml
parent287ea55da70ceb1f0990554b7db921d525fef816 (diff)
* Merged newxml into HEAD
git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@3435 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
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+<?xml version="1.0" encoding="ISO-8859-1"?>
+<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
+ <!ENTITY % general-entities SYSTEM "../general.ent">
+ %general-entities;
+]>
+<sect1 id="ch-system-pwdgroup">
+<title>Creating the passwd, group and log files</title>
+<?dbhtml filename="pwdgroup.html"?>
+
+<indexterm zone="ch-system-pwdgroup"><primary sortas="e-/etc/passwd">/etc/passwd</primary></indexterm>
+<indexterm zone="ch-system-pwdgroup"><primary sortas="e-/etc/group">/etc/group</primary></indexterm>
+<indexterm zone="ch-system-pwdgroup"><primary sortas="e-/var/run/utmp">/var/run/utmp</primary></indexterm>
+<indexterm zone="ch-system-pwdgroup"><primary sortas="e-/var/log/btmp">/var/log/btmp</primary></indexterm>
+<indexterm zone="ch-system-pwdgroup"><primary sortas="e-/var/log/lastlog">/var/log/lastlog</primary></indexterm>
+<indexterm zone="ch-system-pwdgroup"><primary sortas="e-/var/log/wtmp">/var/log/wtmp</primary></indexterm>
+
+<para>In order for <emphasis>root</emphasis> to be able to login and for the
+name <quote>root</quote> to be recognized, there need to be relevant entries in
+the <filename>/etc/passwd</filename> and <filename>/etc/group</filename> files.
+</para>
+
+<para>Create the <filename>/etc/passwd</filename> file by running the following
+command:</para>
+
+<screen><userinput>cat &gt; /etc/passwd &lt;&lt; "EOF"</userinput>
+root:x:0:0:root:/root:/bin/bash
+<userinput>EOF</userinput></screen>
+
+<para>The actual password for <emphasis>root</emphasis> (the <quote>x</quote>
+here is just a placeholder) will be set later.</para>
+
+<para>Create the <filename>/etc/group</filename> file by running the following
+command:</para>
+
+<screen><userinput>cat &gt; /etc/group &lt;&lt; "EOF"</userinput>
+root:x:0:
+bin:x:1:
+sys:x:2:
+kmem:x:3:
+tty:x:4:
+tape:x:5:
+daemon:x:6:
+floppy:x:7:
+disk:x:8:
+lp:x:9:
+dialout:x:10:
+audio:x:11:
+<userinput>EOF</userinput></screen>
+
+<para>The created groups aren't part of any standard -- they are some of the
+groups that the <command>make_devices</command> script in the next section
+uses. The LSB (<ulink url="http://www.linuxbase.org/">Linux Standard
+Base</ulink>) recommends only that, beside the group <quote>root</quote> with a
+GID of 0, a group <quote>bin</quote> with a GID of 1 be present. All other group
+names and GIDs can be chosen freely by the system administrator, since
+well-written packages don't depend on GID numbers but use the group's name.
+</para>
+
+<para>To get rid of the <quote>I have no name!</quote> prompt, we will start a
+new shell. Since we installed a full Glibc in
+<xref linkend="chapter-temporary-tools"/>, and have just created the
+<filename>/etc/passwd</filename> and <filename>/etc/group</filename> files,
+user name and group name resolution will now work.</para>
+
+<screen><userinput>exec /tools/bin/bash --login +h</userinput></screen>
+
+<para>Note the use of the <emphasis>+h</emphasis> directive. This tells
+<command>bash</command> not to use its internal path hashing. Without this
+directive, <command>bash</command> would remember the paths to binaries it
+has executed. Since we want to use our newly compiled binaries as soon as
+they are installed, we turn off this function for the duration of this
+chapter.</para>
+
+<para>The <command>login</command>, <command>agetty</command> and
+<command>init</command> programs (and some others) use a number of log
+files to record information such as who was logged into the system and when.
+These programs, however, won't write to the log files if they don't already
+exist. Initialize the log files and give them their proper permissions:</para>
+
+<screen><userinput>touch /var/run/utmp /var/log/{btmp,lastlog,wtmp}
+chmod 644 /var/run/utmp /var/log/{btmp,lastlog,wtmp}</userinput></screen>
+
+<para>The <filename>/var/run/utmp</filename> file records the users that are
+currently logged in. The <filename>/var/log/wtmp</filename> file records all
+logins and logouts. The <filename>/var/log/lastlog</filename> file records for
+each user when he or she last logged in. The <filename>/var/log/btmp</filename>
+file records the bad login attempts.</para>
+
+</sect1>