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12 <title>GLEP 20 -- /srv - Services Home Directory Support</title>
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24 [<b><a href="http://www.gentoo.org/proj/en/glep">GLEP Index</a></b>]
25 [<b><a href="./glep-0020.txt">GLEP Source</a></b>]
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27 <div class="document">
28 <table class="rfc2822 field-list" frame="void" rules="none">
29 <col class="field-name" />
30 <col class="field-body" />
31 <tbody valign="top">
32 <tr class="field"><th class="field-name">GLEP:</th><td class="field-body">20</td>
33 </tr>
34 <tr class="field"><th class="field-name">Title:</th><td class="field-body">/srv - Services Home Directory Support</td>
35 </tr>
36 <tr class="field"><th class="field-name">Version:</th><td class="field-body">1.2</td>
37 </tr>
38 <tr class="field"><th class="field-name">Last-Modified:</th><td class="field-body"><a class="reference" href="http://www.gentoo.org/cgi-bin/viewcvs/xml/htdocs/proj/en/glep/glep-0020.txt?cvsroot=gentoo">2004/11/11 21:35:53</a></td>
39 </tr>
40 <tr class="field"><th class="field-name">Author:</th><td class="field-body">Stuart Herbert &lt;stuart&#32;&#97;t&#32;gentoo.org&gt;, Rob Holland &lt;tigger&#32;&#97;t&#32;gentoo.org&gt;</td>
41 </tr>
42 <tr class="field"><th class="field-name">Status:</th><td class="field-body">Approved</td>
43 </tr>
44 <tr class="field"><th class="field-name">Type:</th><td class="field-body">Standards Track</td>
45 </tr>
46 <tr class="field"><th class="field-name">Content-Type:</th><td class="field-body"><a class="reference" href="glep-0012.html">text/x-rst</a></td>
47 </tr>
48 <tr class="field"><th class="field-name">Created:</th><td class="field-body">09-Feb-2004</td>
49 </tr>
50 <tr class="field"><th class="field-name">Post-History:</th><td class="field-body">21-Feb-2004, 11-Nov-2004</td>
51 </tr>
52 </tbody>
53 </table>
54 <hr />
55 <div class="contents topic" id="contents">
56 <p class="topic-title first"><a name="contents">Contents</a></p>
57 <ul class="simple">
58 <li><a class="reference" href="#thanks-to" id="id2" name="id2">Thanks To</a></li>
59 <li><a class="reference" href="#abstract" id="id3" name="id3">Abstract</a></li>
60 <li><a class="reference" href="#motivation" id="id4" name="id4">Motivation</a></li>
61 <li><a class="reference" href="#specification" id="id5" name="id5">Specification</a></li>
62 <li><a class="reference" href="#examples" id="id6" name="id6">Examples</a></li>
63 <li><a class="reference" href="#rationale" id="id7" name="id7">Rationale</a></li>
64 <li><a class="reference" href="#implementation" id="id8" name="id8">Implementation</a></li>
65 <li><a class="reference" href="#backwards-compatibility" id="id9" name="id9">Backwards Compatibility</a></li>
66 <li><a class="reference" href="#copyright" id="id10" name="id10">Copyright</a></li>
67 </ul>
68 </div>
69 <div class="section" id="thanks-to">
70 <h1><a class="toc-backref" href="#id2" name="thanks-to">Thanks To</a></h1>
71 <p>Thanks to Robin H. Johnson (<a class="reference" href="mailto:robbat2&#64;gentoo.org">robbat2&#64;gentoo.org</a>) for his assistance in writing
72 this GLEP.</p>
73 </div>
74 <div class="section" id="abstract">
75 <h1><a class="toc-backref" href="#id3" name="abstract">Abstract</a></h1>
76 <p>This GLEP proposes a new root-level directory - /srv - as an optional home
77 for the data (and sometimes the software too) for software that provides
78 services.</p>
79 <p>/srv will be supported via a USE flag. This gives users the choice
80 of using a dedicated service home hierarchy or not.</p>
81 <p>/srv is defined in FHS 2.3, which is part of the upcoming LSB v2.0 release
82 (<a class="reference" href="http://bugs.freestandards.org/cgi-bin/bugzilla/show_bug.cgi?id=16">http://bugs.freestandards.org/cgi-bin/bugzilla/show_bug.cgi?id=16</a>)</p>
83 </div>
84 <div class="section" id="motivation">
85 <h1><a class="toc-backref" href="#id4" name="motivation">Motivation</a></h1>
86 <p>Gentoo currently does not provide sufficiently flexible support for
87 sites which wish to consolidate the data for their service-orientated
88 software under one simple, easy to administer, location.</p>
89 <p>Adding optional support for the /srv directory structure will give
90 sites increased flexibility on how to layout their machines.</p>
91 </div>
92 <div class="section" id="specification">
93 <h1><a class="toc-backref" href="#id5" name="specification">Specification</a></h1>
94 <p>A new global USE flag - srvdir - will be added to Portage.</p>
95 <p>Ebuilds that choose to support the srvdir USE flag will configure the
96 package to install and use their data under the /srv directory.</p>
97 <p>Ebuilds that choose to support the srvdir USE flag - and which install
98 packages that need write access to the same directories that the
99 software is installed into - will configure the package to install
100 the software under the /srv directory.</p>
101 <p>All packages configured to support the srvdir USE flag will support
102 this breakdown of /srv:</p>
103 <blockquote>
104 /srv/&lt;fqdn&gt;/&lt;service&gt;/&lt;service-specific tree&gt;</blockquote>
105 <dl>
106 <dt>where</dt>
107 <dd>&lt;fqdn&gt; is the fully-qualified domain name
108 &lt;service&gt; is the name of the service
109 &lt;service-specific tree&gt; is unique to the package</dd>
110 </dl>
111 <p>Ebuilds that install anything into /srv will install into /srv/localhost.
112 /srv/localhost - or any of the &lt;service&gt; directories underneath it - may be
113 symlinks created by the local administrator.</p>
114 </div>
115 <div class="section" id="examples">
116 <h1><a class="toc-backref" href="#id6" name="examples">Examples</a></h1>
117 <p>For example, backup packages which support the srvdir USE flag could
118 save backup data under the /srv/&lt;hostname&gt;/backups directory for each
119 host on the network that they perform backups for.</p>
120 <p>For example, web-based applications which support the srvdir USE flag
121 could install their software under the /srv/localhost/www/htdocs directory.
122 Ebuilds for web-based applications which also support the vhost USE flag
123 will allow the user to install software under other service domains
124 through the webapp-config package. See GLEP #11 and the vhost-config tool for
125 more information on how this works.</p>
126 <p>There are many other packages that could support the srvdir USE flag -
127 including Portage itself.</p>
128 <p>For packages that do not support the srvdir USE flag, there is currently no
129 recommended default location to use - although /var/localhost may prove a
130 useful alternative.</p>
131 </div>
132 <div class="section" id="rationale">
133 <h1><a class="toc-backref" href="#id7" name="rationale">Rationale</a></h1>
134 <p>Introducing optional support for the /srv directory will benefit a number of
135 groups of Gentoo users.</p>
136 <ul>
137 <li><p class="first">Users who wish to have /usr mounted read-only</p>
138 <p>/srv provides an optional alternative for packages that install writable
139 files into /usr.</p>
140 </li>
141 <li><p class="first">Users who wish to isoloate services from /home utilisation</p>
142 <p>Services stop working when real users fill /home. As many packages cannot
143 detect or robustly cope with this situation, services that write files
144 to disk normally end up corrupting those files.</p>
145 </li>
146 <li><p class="first">Users who do not wish to export /var or its sub-directories</p>
147 <p>Exporting /var - or its subdirectories - via NFS et al is something that
148 some system administrators simply do not wish to do. Providing these users
149 with the choice of installing into /srv fits with the published Gentoo
150 philosophy of allowing users as much choice as possible.</p>
151 </li>
152 <li><p class="first">Users who share resources via NFS, or who use Network-Attached Storage (NAS)</p>
153 <p>Allowing system administrators to choose to configure service-providing
154 software to use a single file hierarchy will greatly simply the management
155 and maintenance of NFS exports - and imports - in clustered environments.</p>
156 </li>
157 <li><p class="first">Service providers, who host more than one customer's services on a machine</p>
158 <p>Grouping all the storage (web, ftp, databases, IMAP, etc etc) under one
159 location greatly simplifies managing disk quotas on that host.</p>
160 <p>It is common practice for shared hosted systems to place web sites,
161 ftp sites and so on under a user's actual home directory. This practice
162 requires the user's home directory to be world-readable, which does not
163 promote strong security!</p>
164 </li>
165 <li><p class="first">Users who wish to store service-orientated files onto a single logical
166 volume to support future growth</p>
167 </li>
168 </ul>
169 <p>The Gentoo Philosophy clearly states that Gentoo Linux will be a
170 highly-configurable meta-distribution. Adding optional support for /srv is
171 very much in keeping with our Philosophy.</p>
172 </div>
173 <div class="section" id="implementation">
174 <h1><a class="toc-backref" href="#id8" name="implementation">Implementation</a></h1>
175 <p>A new USE flag - srvdir - will be added to Portage.</p>
176 <p>Ebuilds and eclasses will choose to support the srvdir USE flag or not on
177 an individual basis.</p>
178 <p>(Author's note: If this GLEP is approved, all web-based applications will
179 support the srvdir USE flag through the work being carried out under GLEP #11)</p>
180 <p>There has been some debate about whether the /srv directory should be provided
181 by the basesystem package or not. Because this support is optional, and
182 because different sites will have different storage requirements, we believe
183 that it should be left to the local Gentoo system administrator to manually
184 create the /srv directory.</p>
185 <p>If baselayout feels that it must install a /srv, then we propose that
186 baselayout installs /srv as a symlink to /var/srv. This approach will support
187 installations that mount the root filesystem read-only.</p>
188 </div>
189 <div class="section" id="backwards-compatibility">
190 <h1><a class="toc-backref" href="#id9" name="backwards-compatibility">Backwards Compatibility</a></h1>
191 <p>Users who choose not to use the new srvdir USE flag will see little to no
192 change. It is likely that some ebuilds will change their non-srvdir directory
193 layout to reduce the amount of effort required to support both options.</p>
194 </div>
195 <div class="section" id="copyright">
196 <h1><a class="toc-backref" href="#id10" name="copyright">Copyright</a></h1>
197 <p>This document is licensed under the Creative Commons - Attribution / Share
198 Alike license. (<a class="reference" href="http://creativecommons.org/licenses/by-sa/1.0">http://creativecommons.org/licenses/by-sa/1.0</a>)</p>
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