source: postlfs/config/users.xml@ 96ece2d7

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Last change on this file since 96ece2d7 was 96ece2d7, checked in by Randy McMurchy <randy@…>, 16 years ago

Text updates and corrections provided by a patch sent in by Chris Staub, thanks Chris

git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@5674 af4574ff-66df-0310-9fd7-8a98e5e911e0

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File size: 5.5 KB
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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
3 "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../../general.ent">
5 %general-entities;
6]>
7
8<sect1 id="postlfs-users-groups" xreflabel="About System Users and Groups">
9 <?dbhtml filename="users.html"?>
10
11 <sect1info>
12 <othername>$LastChangedBy$</othername>
13 <date>$Date$</date>
14 </sect1info>
15
16 <title>About System Users and Groups</title>
17
18 <indexterm zone="postlfs-users-groups">
19 <primary sortas="e-etc-passwd">/etc/passwd</primary>
20 </indexterm>
21
22 <indexterm zone="postlfs-users-groups">
23 <primary sortas="e-etc-group">/etc/group</primary>
24 </indexterm>
25
26 <indexterm zone="postlfs-users-groups">
27 <primary sortas="e-etc-login.defs">/etc/login.defs</primary>
28 </indexterm>
29
30 <para>Throughout BLFS, many packages install programs that
31 run as daemons or in some way should have a user or group name
32 assigned. Generally these names are used to map a user ID (uid) or group
33 ID (gid) for system use. Generally the specific uid or gid numbers used
34 by these applications are not significant. The exception of course, is
35 that <systemitem class='username'>root</systemitem> has a uid and gid of 0
36 (zero) that is indeed special. The uid values are stored in
37 <filename>/etc/passwd</filename> and the gid values
38 are found in <filename>/etc/group</filename>.</para>
39
40 <para>Customarily, Unix systems classify users and groups into two
41 categories: system users and regular users. The system users and groups are
42 given low numbers and regular users and groups have numeric values greater
43 than all the system values. The cutoff for these numbers is found in two
44 parameters in the <filename>/etc/login.defs</filename> configuration file.
45 The default UID_MIN value is 1000 and the default GID_MIN value is 100. If a
46 specific uid or gid value is not specified when creating a user with
47 <command>useradd</command> or a group with <command>groupadd</command> the values
48 assigned will always be above these cutoff values.</para>
49
50 <para>Additionally, the <ulink
51 url='http://refspecs.freestandards.org/LSB_3.0.0/LSB-Core-generic/LSB-Core-generic/usernames.html'>
52 Linux Standard Base</ulink> recommends that system uid and gid values should be
53 below 100.</para>
54
55 <para>Below is a table of suggested uid/gid values used in BLFS. These can
56 be changed as desired, but provide a suggested set of consistent values.</para>
57
58 <table id="uidgid" class='uidvalues'>
59 <title>UID/GID Suggested Values</title>
60 <tgroup cols='3' colsep='0' rowsep='0'>
61 <thead>
62 <row><entry>Name</entry><entry>uid</entry><entry>gid</entry></row>
63 </thead>
64 <tbody>
65 <row><entry>bin </entry><entry> 1</entry><entry> 1</entry></row>
66 <row><entry>lp </entry><entry> 9</entry><entry> </entry></row>
67 <row><entry>usb </entry><entry> </entry><entry>14</entry></row>
68 <row><entry>messagebus</entry><entry>18</entry><entry>18</entry></row>
69 <row><entry>haldaemon</entry><entry>19</entry><entry>19</entry></row>
70 <row><entry>named </entry><entry>20</entry><entry>20</entry></row>
71 <row><entry>gdm </entry><entry>21</entry><entry>21</entry></row>
72 <row><entry>fcron </entry><entry>22</entry><entry>22</entry></row>
73 <row><entry>apache </entry><entry>25</entry><entry>25</entry></row>
74 <row><entry>smmsp </entry><entry>26</entry><entry>26</entry></row>
75 <!-- <row><entry>courier </entry><entry>30</entry><entry>30</entry></row> -->
76 <row><entry>exim </entry><entry>31</entry><entry>31</entry></row>
77 <row><entry>postfix </entry><entry>32</entry><entry>32</entry></row>
78 <row><entry>postdrop</entry><entry> </entry><entry>33</entry></row>
79 <row><entry>sendmail</entry><entry>34</entry><entry> </entry></row>
80 <row><entry>mail </entry><entry> </entry><entry>34</entry></row>
81 <row><entry>vmailman</entry><entry>35</entry><entry>35</entry></row>
82 <row><entry>news </entry><entry>36</entry><entry>36</entry></row>
83 <row><entry>mysql </entry><entry>40</entry><entry>40</entry></row>
84 <row><entry>postgres</entry><entry>41</entry><entry>41</entry></row>
85 <row><entry>ftp </entry><entry>45</entry><entry>45</entry></row>
86 <row><entry>proftpd </entry><entry>46</entry><entry>46</entry></row>
87 <row><entry>vsftpd </entry><entry>47</entry><entry>47</entry></row>
88 <row><entry>rsyncd </entry><entry>48</entry><entry>48</entry></row>
89 <row><entry>sshd </entry><entry>50</entry><entry>50</entry></row>
90 <row><entry>stunnel </entry><entry>51</entry><entry>51</entry></row>
91 <row><entry>svn </entry><entry>56</entry><entry>56</entry></row>
92 <row><entry>svntest </entry><entry> </entry><entry>57</entry></row>
93 <row><entry>games </entry><entry>60</entry><entry>60</entry></row>
94 <row><entry>anonymous</entry><entry>98</entry><entry> </entry></row>
95 <row><entry>nobody </entry><entry>99</entry><entry> </entry></row>
96 <row><entry>nogroup </entry><entry> </entry><entry>99</entry></row>
97 </tbody>
98 </tgroup>
99 </table>
100
101 <para>One value that is missing is 65534. This value is customarily assigned
102 to the user <systemitem class="username">nobody</systemitem> and group
103 <systemitem class="groupname">nogroup</systemitem> and is unnecessary. The
104 issue is explained in more detail in the first note in the <xref
105 linkend='nfs-utils-install'/> section.</para>
106
107</sect1>
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