diff options
author | Matthew Burgess <matthew@linuxfromscratch.org> | 2004-05-03 10:59:46 +0000 |
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committer | Matthew Burgess <matthew@linuxfromscratch.org> | 2004-05-03 10:59:46 +0000 |
commit | 673b0d84ba9591e07c0bdf0ee49d92eba10f502c (patch) | |
tree | 129e27a1450727b440da4378e0117a468eb9c25e /chapter06/pwdgroup.xml | |
parent | 287ea55da70ceb1f0990554b7db921d525fef816 (diff) |
* Merged newxml into HEAD
git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@3435 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
Diffstat (limited to 'chapter06/pwdgroup.xml')
-rw-r--r-- | chapter06/pwdgroup.xml | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/chapter06/pwdgroup.xml b/chapter06/pwdgroup.xml new file mode 100644 index 000000000..a515de425 --- /dev/null +++ b/chapter06/pwdgroup.xml @@ -0,0 +1,89 @@ +<?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 > /etc/passwd << "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 > /etc/group << "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> |