1 <?xml version='1.0' encoding='UTF-8' ?>
2 <!DOCTYPE manualpage SYSTEM "./style/manualpage.dtd">
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23 <manualpage metafile="upgrading.xml.meta">
25 <title>Upgrading to 2.4 from 2.2</title>
28 <p>In order to assist folks upgrading, we maintain a document
29 describing information critical to existing Apache HTTP Server users. These
30 are intended to be brief notes, and you should be able to find
31 more information in either the <a
32 href="new_features_2_4.html">New Features</a> document, or in
33 the <code>src/CHANGES</code> file. Application and module developers
34 can find a summary of API changes in the <a href="new_api_2_4.html"
35 >API updates</a> overview.</p>
37 <p>This document describes changes in server behavior that might
38 require you to change your configuration or how you use the server
39 in order to continue using 2.4 as you are currently using 2.2.
40 To take advantage of new features in 2.4, see the New Features
43 <p>This document describes only the changes from 2.2 to 2.4. If you
44 are upgrading from version 2.0, you should also consult the <a
45 href="http://httpd.apache.org/docs/2.2/upgrading.html">2.0 to 2.2
46 upgrading document.</a></p>
49 <seealso><a href="new_features_2_4.html">Overview of new features in
50 Apache HTTP Server 2.4</a></seealso>
52 <section id="compile-time">
53 <title>Compile-Time Configuration Changes</title>
55 <p>The compilation process is very similar to the one used in
56 version 2.2. Your old <code>configure</code> command line (as
57 found in <code>build/config.nice</code> in the installed server
58 directory) can be used in most cases. There are some changes in
59 the default settings. Some details of changes:</p>
62 <li>These modules have been removed: mod_authn_default,
63 mod_authz_default, mod_mem_cache. If you were using
64 mod_mem_cache in 2.2, look at <module>mod_disk_cache</module> in
67 <li>All load balancing implementations have been moved to
68 individual, self-contained mod_proxy submodules, e.g.
69 <module>mod_lbmethod_bybusyness</module>. You might need
70 to build and load any of these that your configuration
73 <li>Platform support has been removed for BeOS, OS/2, TPF, and
74 even older platforms such as A/UX, Next, and Tandem. These were
75 believed to be broken anyway.</li>
77 <li>configure: dynamic modules (DSO) are built by default</li>
79 <li>configure: the "most" module set gets built by default</li>
84 <section id="run-time">
85 <title>Run-Time Configuration Changes</title>
86 <p>There have been significant changes in authorization configuration,
87 and other minor configuration changes, that could require changes to your 2.2
88 configuration files before using them for 2.4.</p>
91 <title>Authorization</title>
93 <p>Any configuration file that uses authorization will likely
96 <p>You should review the <a href="howto/auth.html">Authentication,
97 Authorization and Access Control Howto</a>, especially the section
98 <a href="howto/auth.html#beyond">Beyond just authorization</a>
99 which explains the new mechanisms for controlling the order in
100 which the authorization directives are applied.</p>
102 <section id="access">
103 <title>Access control</title>
105 <p>In 2.2, access control based on client hostname, IP address,
106 and other characteristics of client requests was done using the
107 directives <directive
108 module="mod_access_compat">Order</directive>, <directive
109 module="mod_access_compat">Allow</directive>, <directive
110 module="mod_access_compat">Deny</directive>, and <directive
111 module="mod_access_compat">Satisfy</directive>.</p>
113 <p>In 2.4, such access control is done in the same way as other
114 authorization checks, using the new module
115 <module>mod_authz_host</module>. The old access control idioms
116 should be replaced by the new authentication mechanisms,
117 although for compatibility with old configurations, the new
118 module <module>mod_access_compat</module> is provided.</p>
120 <p>Here are some examples of old and new ways to do the same
123 <p>In this example, all requests are denied.</p>
125 <title>2.2 configuration:</title>
126 Order deny,allow<br />
130 <title>2.4 configuration:</title>
134 <p>In this example, all requests are allowed.</p>
136 <title>2.2 configuration:</title>
137 Order allow,deny<br />
141 <title>2.4 configuration:</title>
145 <p>In the following example, all hosts in the apache.org domain
146 are allowed access; all other hosts are denied access.</p>
149 <title>2.2 configuration:</title>
150 Order Deny,Allow<br />
152 Allow from apache.org
155 <title>2.4 configuration:</title>
156 Require host apache.org
162 <section id="config">
163 <title>Other configuration changes</title>
165 <p>Some other small adjustments may be necessary for particular
166 configurations as discussed below.</p>
169 <li>The <directive module="core">DefaultType</directive>
170 directive no longer has any effect, other than to emit a
171 warning if it's used with any value other than
172 <code>none</code>. You need to use other configuration
173 settings to replace it in 2.4.
176 <li><module>mod_log_config</module>: <a
177 href="modules/mod_log_config.html#formats">${cookie}C</a>
178 matches whole cookie names. Previously any substring would
181 <li><module>mod_dav_fs</module>: The format of the <directive
182 module="dav_fs">DavLockDB</directive> file has changed for
183 systems with inodes. The old <directive
184 module="dav_fs">DavLockDB</directive> file must be deleted on
188 <li><directive module="core">KeepAlive</directive> only
189 accepts values of <code>On</code> or <code>Off</code>.
190 Previously, any value other than "Off" or "0" was treated as
193 <li>Directives AcceptMutex, LockFile, RewriteLock, SSLMutex,
194 SSLStaplingMutex, and WatchdogMutexPath have been replaced
195 with a single <directive module="core">Mutex</directive>
196 directive. You will need to evaluate any use of these removed
197 directives in your 2.2 configuration to determine if they can
198 just be deleted or will need to be replaced using <directive
199 module="core">Mutex</directive>.</li>
201 <li><module>mod_cache</module>: <directive
202 module="cache">CacheIgnoreURLSessionIdentifiers</directive>
203 now does an exact match against the query string instead of a
204 partial match. If your configuration was using partial
205 strings, e.g. using <code>sessionid</code> to match
206 <code>/someapplication/image.gif;jsessionid=123456789</code>,
207 then you will need to change to the full string
208 <code>jsessionid</code>.
211 <li><module>mod_ldap</module>: <directive
212 module="ldap">LDAPTrustedClientCert</directive> is now
213 consistently a per-directory setting only. If you use this
214 directive, review your configuration to make sure it is
215 present in all the necessary directory contexts.</li>
222 <title>Misc Changes</title>
225 <li><module>mod_auto_index</module>: will now extract titles and
226 display descriptions for .xhtml files, which were previously
228 <li><program>htpasswd</program> now uses MD5 hash by default on
235 <section id="third-party">
236 <title>Third Party Modules</title>
237 <p>All modules must be recompiled for 2.4 before being loaded.</p>
239 <p>Many third-party modules designed for version 2.2 will
240 otherwise work unchanged with the Apache HTTP Server version 2.4.
241 Some will require changes; see the <a href="new_api_2_4.html">API
242 update</a> overview.</p>
245 <section id="commonproblems">
246 <title>Common problems when upgrading</title>
247 <ul><li>Startup errors:
249 <li><code>Invalid command 'User', perhaps misspelled or defined by a module not included in the server configuration</code> - load module <module>mod_unixd</module></li>
250 <li><code>Invalid command 'Require', perhaps misspelled or defined by a module not included in the server configuration</code>, or
251 <code>Invalid command 'Order', perhaps misspelled or defined by a module not included in the server configuration</code>
252 - load module <module>mod_access_compat</module>, or update configuration to 2.4 authorization directives.</li>
253 <li><code>Ignoring deprecated use of DefaultType in line NN of /path/to/httpd.conf</code> - remove <directive module="core">DefaultType</directive>
254 and replace with other configuration settings.</li>
256 <li>Errors serving requests:
258 <li><code>configuration error: couldn't check user: /path</code> -
259 load module <module>mod_authn_core</module>.</li>