source: postlfs/config/users.xml@ 03b8993

11.0 qt5new trunk
Last change on this file since 03b8993 was 03b8993, checked in by Douglas R. Reno <renodr@…>, 5 months ago

About System Users And Groups: Add the UID for systemd-logind, add the
systemd-oomd user and group

  • Property mode set to 100644
File size: 8.7 KB
Line 
1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/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 <date>$Date$</date>
13 </sect1info>
14
15 <title>About System Users and Groups</title>
16
17 <indexterm zone="postlfs-users-groups">
18 <primary sortas="e-etc-passwd">/etc/passwd</primary>
19 </indexterm>
20
21 <indexterm zone="postlfs-users-groups">
22 <primary sortas="e-etc-group">/etc/group</primary>
23 </indexterm>
24
25 <indexterm zone="postlfs-users-groups">
26 <primary sortas="e-etc-login.defs">/etc/login.defs</primary>
27 </indexterm>
28
29 <para>
30 Throughout BLFS, many packages install programs that run as daemons or in
31 some way should have a user or group name assigned. Generally these
32 names are used to map a user ID (uid) or group ID (gid) for system use.
33 Generally the specific uid or gid numbers used by these applications are
34 not significant. The exception of course, is that <systemitem
35 class='username'>root</systemitem> has a uid and gid of 0 (zero) that
36 is indeed special. The uid values are stored in
37 <filename>/etc/passwd</filename> and the gid values are found in
38 <filename>/etc/group</filename>.
39 </para>
40
41 <para>
42 Customarily, Unix systems classify users and groups into two categories:
43 system users and regular users. The system users and groups are given
44 low numbers and regular users and groups have numeric values greater
45 than all the system values. The cutoff for these numbers is found in
46 two parameters in the <filename>/etc/login.defs</filename> configuration
47 file. The default UID_MIN value is 1000 and the default GID_MIN value
48 is 1000. If a specific uid or gid value is not specified when creating
49 a user with <command>useradd</command> or a group with
50 <command>groupadd</command> the values assigned will always be above
51 these cutoff values.
52 </para>
53
54 <para>
55 Additionally, the <ulink url=
56 "http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/usernames.html">
57 Linux Standard Base</ulink> recommends that system uid and gid values
58 should be below 100.
59 </para>
60
61 <para>
62 Below is a table of suggested uid/gid values used in BLFS beyond those
63 defined in a base LFS installation. These can be changed as desired, but
64 provide a suggested set of consistent values.
65 </para>
66
67 <table id="uidgid" class="uidvalues">
68 <title>UID/GID Suggested Values</title>
69 <?dbfo table-width="2in" ?>
70 <tgroup cols="3">
71 <colspec colnum="1" colwidth="1.2in"/>
72 <colspec colnum="2" colwidth=".4in"/>
73 <colspec colnum="3" colwidth=".4in"/>
74 <thead>
75 <row><entry>Name</entry><entry>uid</entry><entry>gid</entry></row>
76 </thead>
77 <tbody>
78 <row><entry>bin </entry><entry> 1</entry><entry> </entry></row>
79 <row><entry>lp </entry><entry> 9</entry><entry> </entry></row>
80 <!--<row><entry>usb </entry><entry> </entry><entry>14</entry></row> -->
81 <row><entry>adm </entry><entry> </entry><entry>16</entry></row>
82 <row><entry>atd </entry><entry>17</entry><entry>17</entry></row>
83 <row><entry>messagebus</entry><entry>18</entry><entry>18</entry></row>
84 <row><entry>lpadmin </entry><entry></entry><entry>19</entry></row>
85 <row><entry>named </entry><entry>20</entry><entry>20</entry></row>
86 <row><entry>gdm </entry><entry>21</entry><entry>21</entry></row>
87 <row><entry>fcron </entry><entry>22</entry><entry>22</entry></row>
88 <row><entry>systemd-journal</entry><entry>23</entry><entry>23</entry></row>
89 <row><entry>apache </entry><entry>25</entry><entry>25</entry></row>
90 <row><entry>smmsp </entry><entry>26</entry><entry>26</entry></row>
91 <row><entry>polkitd </entry><entry>27</entry><entry>27</entry></row>
92 <row><entry>rpc </entry><entry>28</entry><entry>28</entry></row>
93 <!-- <row><entry>courier </entry><entry>30</entry><entry>30</entry></row> -->
94 <row><entry>exim </entry><entry>31</entry><entry>31</entry></row>
95 <row><entry>postfix </entry><entry>32</entry><entry>32</entry></row>
96 <row><entry>postdrop</entry><entry> </entry><entry>33</entry></row>
97 <row><entry>sendmail</entry><entry>34</entry><entry> </entry></row>
98 <row><entry>mail </entry><entry> </entry><entry>34</entry></row>
99 <row><entry>vmailman</entry><entry>35</entry><entry>35</entry></row>
100 <row><entry>news </entry><entry>36</entry><entry>36</entry></row>
101 <row><entry>kdm </entry><entry>37</entry><entry>37</entry></row>
102 <row><entry>fetchmail</entry><entry>38</entry><entry> </entry></row>
103 <row><entry>mysql </entry><entry>40</entry><entry>40</entry></row>
104 <row><entry>postgres</entry><entry>41</entry><entry>41</entry></row>
105 <row><entry>dovecot </entry><entry>42</entry><entry>42</entry></row>
106 <row><entry>dovenull</entry><entry>43</entry><entry>43</entry></row>
107 <row><entry>ftp </entry><entry>45</entry><entry>45</entry></row>
108 <row><entry>proftpd </entry><entry>46</entry><entry>46</entry></row>
109 <row><entry>vsftpd </entry><entry>47</entry><entry>47</entry></row>
110 <row><entry>rsyncd </entry><entry>48</entry><entry>48</entry></row>
111 <row><entry>sshd </entry><entry>50</entry><entry>50</entry></row>
112 <row><entry>stunnel </entry><entry>51</entry><entry>51</entry></row>
113 <row><entry>dhcpcd </entry><entry>52</entry><entry>52</entry></row>
114 <row><entry>svn </entry><entry>56</entry><entry>56</entry></row>
115 <row><entry>svntest </entry><entry> </entry><entry>57</entry></row>
116 <row><entry>git </entry><entry>58</entry><entry>58</entry></row>
117 <!-- <row><entry>pulse </entry><entry>58</entry><entry>58</entry></row>
118 <row><entry>pulse-access</entry><entry></entry><entry>59</entry></row>
119-->
120 <row><entry>games </entry><entry>60</entry><entry>60</entry></row>
121 <row><entry>kvm </entry><entry> </entry><entry>61</entry></row>
122 <row><entry>wireshark</entry><entry> </entry><entry>62</entry></row>
123 <row><entry>lightdm </entry><entry>63</entry><entry>63</entry></row>
124 <row><entry>sddm </entry><entry>64</entry><entry>64</entry></row>
125 <row><entry>lightdm </entry><entry>65</entry><entry>65</entry></row>
126 <row><entry>scanner </entry><entry> </entry><entry>70</entry></row>
127 <row><entry>colord </entry><entry>71</entry><entry>71</entry></row>
128
129 <!-- Begin systemd specific users and groups -->
130 <row><entry>systemd-bus-proxy</entry><entry>72</entry><entry>72</entry></row>
131 <row><entry>systemd-journal-gateway</entry><entry>73</entry><entry>73</entry></row>
132 <row><entry>systemd-journal-remote</entry><entry>74</entry><entry>74</entry></row>
133 <row><entry>systemd-journal-upload</entry><entry>75</entry><entry>75</entry></row>
134 <row><entry>systemd-network</entry><entry>76</entry><entry>76</entry></row>
135 <row><entry>systemd-resolve</entry><entry>77</entry><entry>77</entry></row>
136 <row><entry>systemd-timesync</entry><entry>78</entry><entry>78</entry></row>
137 <row><entry>systemd-coredump</entry><entry>79</entry><entry>79</entry></row>
138 <!-- End systemd specific users and groups -->
139
140 <row><entry>uuidd </entry><entry>80</entry><entry>80</entry></row>
141 <row><entry>systemd-oomd</entry><entry>81</entry><entry>81</entry></row>
142 <row><entry>ldap </entry><entry>83</entry><entry>83</entry></row>
143 <row><entry>avahi </entry><entry>84</entry><entry>84</entry></row>
144 <row><entry>avahi-autoipd</entry><entry>85</entry><entry>85</entry></row>
145 <row><entry>netdev </entry><entry> </entry><entry>86</entry></row>
146 <row><entry>ntp </entry><entry>87</entry><entry>87</entry></row>
147 <row><entry>unbound </entry><entry>88</entry><entry>88</entry></row>
148 <row><entry>plugdev </entry><entry> </entry><entry>90</entry></row>
149 <row><entry>wheel </entry><entry> </entry><entry>97</entry></row>
150 <row><entry>anonymous</entry><entry>98</entry><entry> </entry></row>
151 <row><entry>nobody </entry><entry>99</entry><entry> </entry></row>
152 <row><entry>nogroup </entry><entry> </entry><entry>99</entry></row>
153 </tbody>
154 </tgroup>
155 </table>
156
157 <para>
158 One value that is missing is 65534. This value is customarily assigned
159 to the user <systemitem class="username">nobody</systemitem> and group
160 <systemitem class="groupname">nogroup</systemitem> and is unnecessary.
161 </para>
162
163</sect1>
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