<identifier>log_config_module</identifier>
<summary>
-
<p>This module provides for flexible logging of client
requests. Logs are written in a customizable format, and may be
written directly to a file, or to an external program.
of the request.</p>
<p>Three directives are provided by this module:
- <code>TransferLog</code> to create a log file,
- <code>LogFormat</code> to set a custom format, and
- <code>CustomLog</code> to define a log file and format in one
- step. The <code>TransferLog</code> and <code>CustomLog</code>
- directives can be used multiple times in each server to cause
- each request to be logged to multiple files.</p>
+ <directive module="mod_log_config">TransferLog</directive> to create
+ a log file, <directive module="mod_log_config">LogFormat</directive>
+ to set a custom format, and <directive module="mod_log_config"
+ >CustomLog</directive> to define a log file and format in one
+ step. The <directive>TransferLog</directive> and <directive
+ >CustomLog</directive> directives can be used multiple times in each
+ server to cause each request to be logged to multiple files.</p>
</summary>
-
<seealso><a href="../logs.html">Apache Log Files</a></seealso>
-<section id="formats">
-<title>Custom Log Formats</title>
+<section id="formats"><title>Custom Log Formats</title>
- <p>The format argument to the <code>LogFormat</code> and
- <code>CustomLog</code> directives is a string. This string is
+ <p>The format argument to the <directive module="mod_log_config"
+ >LogFormat</directive> and <directive module="mod_log_config"
+ >CustomLog</directive> directives is a string. This string is
logged to the log file for each request. It can contain literal
characters copied into the log files and the c-type control
characters "\n" and "\t" to represent new-lines and tabs.
back-slashes.</p>
<p>The characteristics of the request itself are logged by
- placing "%" directives in the format string, which are replaced
- in the log file by the values as follows:</p>
+ placing "<code>%</code>" directives in the format string, which are
+ replaced in the log file by the values as follows:</p>
+
+ <table border="1" style="zebra">
+ <tr><th>Format String</th>
+ <th>Description</th></tr>
-<table>
+ <tr><td><code>%...a</code></td>
+ <td>Remote IP-address</td></tr>
-<tr><td>%...a:</td>
-<td>Remote IP-address</td></tr>
+ <tr><td><code>%...A</code></td>
+ <td>Local IP-address</td></tr>
-<tr><td>%...A:</td>
-<td>Local IP-address</td></tr>
+ <tr><td><code>%...B</code></td>
+ <td>Bytes sent, excluding HTTP headers.</td></tr>
-<tr><td>%...B:</td>
-<td>Bytes sent, excluding HTTP headers.</td></tr>
+ <tr><td><code>%...b</code></td>
+ <td>Bytes sent, excluding HTTP headers. In CLF format, <em>i.e.</em>
+ a '<code>-</code>' rather than a 0 when no bytes are sent.</td></tr>
-<tr><td>%...b:</td>
-<td>Bytes sent, excluding HTTP headers. In CLF format
-i.e. a '-' rather than a 0 when no bytes are sent.</td></tr>
+ <tr><td><code>%...{<var>Foobar</var>}C</code></td>
+ <td>The contents of cookie <var>Foobar</var> in the request sent
+ to the server.</td></tr>
-<tr><td>%...{Foobar}C:</td>
-<td>The contents of cookie "Foobar" in the request sent to the server.</td></tr>
+ <tr><td><code>%...D</code></td>
+ <td>The time taken to serve the request, in microseconds.</td></tr>
-<tr><td>%...D:</td>
-<td>The time taken to serve the request, in microseconds.</td></tr>
+ <tr><td><code>%...{<var>FOOBAR</var>}e</code></td>
+ <td>The contents of the environment variable
+ <var>FOOBAR</var></td></tr>
-<tr><td>%...{FOOBAR}e:</td>
-<td>The contents of the environment variable FOOBAR</td></tr>
+ <tr><td><code>%...f</code></td>
+ <td>Filename</td></tr>
-<tr><td>%...f:</td>
-<td>Filename</td></tr>
+ <tr><td><code>%...h</code></td>
+ <td>Remote host</td></tr>
-<tr><td>%...h:</td>
-<td>Remote host</td></tr>
+ <tr><td><code>%...H</code></td>
+ <td>The request protocol</td></tr>
-<tr><td>%...H</td>
-<td>The request protocol</td></tr>
+ <tr><td><code>%...{<var>Foobar</var>}i</code></td>
+ <td>The contents of <code><var>Foobar</var>:</code> header line(s)
+ in the request sent to the server.</td></tr>
-<tr><td>%...{Foobar}i:</td>
-<td>The contents of Foobar: header line(s) in the request
-sent to the server.</td></tr>
+ <tr><td><code>%...l</code></td>
+ <td>Remote logname (from identd, if supplied)</td></tr>
-<tr><td>%...l:</td>
-<td>Remote logname (from identd, if supplied)</td></tr>
+ <tr><td><code>%...m</code></td>
+ <td>The request method</td></tr>
-<tr><td>%...m:</td>
-<td>The request method</td></tr>
+ <tr><td><code>%...{<var>Foobar</var>}n</code></td>
+ <td>The contents of note <var>Foobar</var> from another
+ module.</td></tr>
-<tr><td>%...{Foobar}n:</td>
-<td>The contents of note "Foobar" from another module.</td></tr>
+ <tr><td><code>%...{<var>Foobar</var>}o</code></td>
+ <td>The contents of <code><var>Foobar</var>:</code> header line(s)
+ in the reply.</td></tr>
-<tr><td>%...{Foobar}o:</td>
-<td>The contents of Foobar: header line(s) in the reply.</td></tr>
+ <tr><td><code>%...p</code></td>
+ <td>The canonical port of the server serving the request</td></tr>
-<tr><td>%...p:</td>
-<td>The canonical Port of the server serving the request</td></tr>
+ <tr><td><code>%...P</code></td>
+ <td>The process ID of the child that serviced the request.</td></tr>
-<tr><td>%...P:</td>
-<td>The process ID of the child that serviced the request.</td></tr>
+ <tr><td><code>%...q</code></td>
+ <td>The query string (prepended with a <code>?</code> if a query
+ string exists, otherwise an empty string)</td></tr>
-<tr><td>%...q:</td>
-<td>The query string (prepended with a ? if a query string exists,
-otherwise an empty string)</td></tr>
+ <tr><td><code>%...r</code></td>
+ <td>First line of request</td></tr>
-<tr><td>%...r:</td>
-<td>First line of request</td></tr>
+ <tr><td><code>%...s</code></td>
+ <td>Status. For requests that got internally redirected, this is
+ the status of the *original* request --- <code>%...>s</code>
+ for the last.</td></tr>
-<tr><td>%...s:</td>
-<td>Status. For requests that got internally redirected, this is
-the status of the *original* request --- %...>s for the last.</td></tr>
+ <tr><td><code>%...t</code></td>
+ <td>Time, in common log format time format (standard english
+ format)</td></tr>
-<tr><td>%...t:</td>
-<td>Time, in common log format time format (standard english format)</td></tr>
+ <tr><td><code>%...{<var>format</var>}t</code></td>
+ <td>The time, in the form given by format, which should be in
+ <code>strftime(3)</code> format. (potentially localized)</td></tr>
-<tr><td>%...{format}t:</td>
-<td>The time, in the form given by format, which should
-be in strftime(3) format. (potentially localized)</td></tr>
+ <tr><td><code>%...T</code></td>
+ <td>The time taken to serve the request, in seconds.</td></tr>
-<tr><td>%...T:</td>
-<td>The time taken to serve the request, in seconds.</td></tr>
+ <tr><td><code>%...u</code></td>
+ <td>Remote user (from auth; may be bogus if return status
+ (<code>%s</code>) is 401)</td></tr>
-<tr><td>%...u:</td>
-<td>Remote user (from auth; may be bogus if return status (%s) is 401)</td></tr>
+ <tr><td><code>%...U</code></td>
+ <td>The URL path requested, not including any query string.</td></tr>
-<tr><td>%...U:</td>
-<td>The URL path requested, not including any query string.</td></tr>
+ <tr><td><code>%...v</code></td>
+ <td>The canonical <directive module="core">ServerName</directive>
+ of the server serving the request.</td></tr>
-<tr><td>%...v:</td>
-<td>The canonical ServerName of the server serving the request.</td></tr>
+ <tr><td><code>%...V</code></td>
+ <td>The server name according to the <directive module="core"
+ >UseCanonicalName</directive> setting.</td></tr>
-<tr><td>%...V:</td>
-<td>The server name according to the UseCanonicalName setting.</td></tr>
+ <tr><td><code>%...X</code></td>
+ <td>Connection status when response is completed:
-<tr><td>%...X:</td>
-<td>Connection status when response is completed.
-<example>
-'X' = connection aborted before the response completed.<br />
-'+' = connection may be kept alive after the response is sent.<br />
-'-' = connection will be closed after the response is sent.
-</example>
-<note>(This directive was %...c in late versions of Apache 1.3, but
-this conflicted with the historical ssl %...{var}c syntax.)</note>
-</td></tr>
+ <table>
+ <tr><td><code>X</code> =</td>
+ <td>connection aborted before the response completed.</td></tr>
+ <tr><td><code>+</code> =</td>
+ <td>connection may be kept alive after the response is
+ sent.</td></tr>
+ <tr><td><code>-</code> = </td>
+ <td>connection will be closed after the response is
+ sent.</td></tr>
+ </table>
-<tr><td>%...I:</td>
-<td>Bytes received, including request and headers, cannot be zero. You need to
-enable <module>mod_logio</module> to use this.</td></tr>
+ <p>(This directive was <code>%...c</code> in late versions of Apache
+ 1.3, but this conflicted with the historical ssl
+ <code>%...{<var>var</var>}c</code> syntax.)</p></td></tr>
-<tr><td>%...O:</td>
-<td>Bytes sent, including headers, cannot be zero. You need to enable
-<module>mod_logio</module> to use this.</td></tr>
+ <tr><td><code>%...I</code></td>
+ <td>Bytes received, including request and headers, cannot be zero.
+ You need to enable <module>mod_logio</module> to use this.</td></tr>
-</table>
+ <tr><td><code>%...O</code></td>
+ <td>Bytes sent, including headers, cannot be zero. You need to
+ enable <module>mod_logio</module> to use this.</td></tr>
+ </table>
- <p>The "..." can be nothing at all (<em>e.g.</em>, <code>"%h %u
- %r %s %b"</code>), or it can indicate conditions for inclusion
- of the item (which will cause it to be replaced with "-" if the
- condition is not met). The forms of condition are a list of
+ <p>The "<var>...</var>" can be nothing at all (<em>e.g.</em>,
+ <code>"%h %u %r %s %b"</code>), or it can indicate conditions for
+ inclusion of the item (which will cause it to be replaced with "-" if
+ the condition is not met). The forms of condition are a list of
HTTP status codes, which may or may not be preceded by "!".
- Thus, "%400,501{User-agent}i" logs User-agent: on 400 errors
- and 501 errors (Bad Request, Not Implemented) only;
- "%!200,304,302{Referer}i" logs Referer: on all requests which
- did <strong>not</strong> return some sort of normal status.</p>
+ Thus, "%400,501{User-agent}i" logs <code>User-agent:</code> on 400
+ errors and 501 errors (Bad Request, Not Implemented) only;
+ "%!200,304,302{Referer}i" logs <code>Referer:</code> on all requests
+ which did <em>not</em> return some sort of normal status.</p>
<p>Note that there is no escaping performed on the strings from
- %...r, %...i and %...o. This is mainly to comply with the
- requirements of the Common Log Format. This implies that
- clients can insert control characters into the log, so care
- should be taken when dealing with raw log files.</p>
+ <code>%...r</code>, <code>%...i</code> and <code>%...o</code>. This
+ is mainly to comply with the requirements of the Common Log Format.
+ This implies that clients can insert control characters into the log,
+ so care should be taken when dealing with raw log files.</p>
<p>Some commonly used log format strings are:</p>
<dl>
<dt>Common Log Format (CLF)</dt>
-
<dd><code>"%h %l %u %t \"%r\" %>s %b"</code></dd>
<dt>Common Log Format with Virtual Host</dt>
-
<dd><code>"%v %h %l %u %t \"%r\" %>s %b"</code></dd>
<dt>NCSA extended/combined log format</dt>
-
<dd><code>"%h %l %u %t \"%r\" %>s %b \"%{Referer}i\"
\"%{User-agent}i\""</code></dd>
<dt>Referer log format</dt>
-
<dd><code>"%{Referer}i -> %U"</code></dd>
<dt>Agent (Browser) log format</dt>
-
<dd><code>"%{User-agent}i"</code></dd>
</dl>
- <p>Note that the canonical <a
- href="core.html#servername">ServerName</a> and <a
- href="mpm_common.html#listen">Listen</a> of the server serving the
+ <p>Note that the canonical <directive module="core"
+ >ServerName</directive> and <directive module="mpm_common"
+ >Listen</directive> of the server serving the
request are used for <code>%v</code> and <code>%p</code>
- respectively. This happens regardless of the <a
- href="core.html#usecanonicalname">UseCanonicalName</a> setting
+ respectively. This happens regardless of the <directive
+ module="core">UseCanonicalName</directive> setting
because otherwise log analysis programs would have to duplicate
the entire vhost matching algorithm in order to decide what
host really served the request.</p>
- </section>
-
- <section id="security">
-
- <title>Security Considerations</title>
+</section>
+<section id="security"><title>Security Considerations</title>
<p>See the <a
href="../misc/security_tips.html#serverroot">security tips</a>
document for details on why your security could be compromised
if the directory where logfiles are stored is writable by
anyone other than the user that starts the server.</p>
-
- </section>
+</section>
<directivesynopsis>
<name>CookieLog</name>
<description>Sets filename for the logging of cookies</description>
-<syntax>CookieLog <em>filename</em></syntax>
-<contextlist><context>server config</context><context>virtual
-host</context></contextlist>
-<compatibility>Only available in Apache 1.2 and above</compatibility>
+<syntax>CookieLog <var>filename</var></syntax>
+<contextlist><context>server config</context><context>virtual host</context>
+</contextlist>
+<compatibility>This directive is deprecated.</compatibility>
<usage>
-
<p>The <directive>CookieLog</directive> directive sets the
filename for logging of cookies. The filename is relative to the
- <directive module="core">serverroot</directive>. This directive is
+ <directive module="core">ServerRoot</directive>. This directive is
included only for compatibility with <code>mod_cookies</code>,
and is deprecated.</p>
</usage>
-
</directivesynopsis>
<directivesynopsis>
<name>CustomLog</name>
<description>Sets filename and format of log file</description>
-<syntax>CustomLog
- <em>file</em>|<em>pipe</em> <em>format</em>|<em>nickname</em>
- [env=[!]<em>environment-variable</em>]</syntax>
-<contextlist><context>server config</context><context>virtual
-host</context></contextlist>
-<compatibility>Nickname only available in Apache 1.3 or later.
-Conditional logging available in 1.3.5 or later.</compatibility>
-
+<syntax>CustomLog <var>file</var>|<var>pipe</var>
+<var>format</var>|<var>nickname</var>
+[env=[!]<var>environment-variable</var>]</syntax>
+<contextlist><context>server config</context><context>virtual host</context>
+</contextlist>
<usage>
<p>The <directive>CustomLog</directive> directive is used to
types of values:</p>
<dl>
- <dt><em>file</em></dt>
-
- <dd>A filename, relative to the <a
- href="core.html#serverroot">ServerRoot</a>.</dd>
-
- <dt><em>pipe</em></dt>
+ <dt><var>file</var></dt>
+ <dd>A filename, relative to the <directive module="core"
+ >ServerRoot</directive>.</dd>
+ <dt><var>pipe</var></dt>
<dd>The pipe character "<code>|</code>", followed by the path
to a program to receive the log information on its standard
- input. <strong>Security:</strong> if a program is used, then
- it will be run under the user who started httpd. This will be
- root if the server was started by root; be sure that the
- program is secure.</dd>
+ input.
+
+ <note type="warning"><title>Security:</title>
+ <p>If a program is used, then it will be run under the user who
+ started httpd. This will be root if the server was started by root;
+ be sure that the program is secure.</p>
+ </note></dd>
</dl>
<p>The second argument specifies what will be written to the
- log file. It can specify either a <em>nickname</em> defined by
- a previous <a href="#logformat">LogFormat</a> directive, or it
- can be an explicit <em>format</em> string as described in the
- <a href="#formats">log formats</a> section.</p>
+ log file. It can specify either a <var>nickname</var> defined by
+ a previous <directive module="mod_log_config">LogFormat</directive>
+ directive, or it can be an explicit <var>format</var> string as
+
described in the <a href="#formats">log formats</a> section.</p>
<p>For example, the following two sets of directives have
exactly the same effect:</p>
-<example>
- # CustomLog with format nickname<br />
- LogFormat "%h %l %u %t \"%r\" %>s %b" common<br />
- CustomLog logs/access_log common<br />
-<br />
- # CustomLog with explicit format string<br />
- CustomLog logs/access_log "%h %l %u %t \"%r\" %>s %b"<br />
-</example>
+ <example>
+ # CustomLog with format nickname<br />
+ LogFormat "%h %l %u %t \"%r\" %>s %b" common<br />
+ CustomLog logs/access_log common<br />
+ <br />
+ # CustomLog with explicit format string<br />
+ CustomLog logs/access_log "%h %l %u %t \"%r\" %>s %b"
+ </example>
<p>The third argument is optional and allows the decision on
whether or not to log a particular request to be based on the
presence or absence of a particular variable in the server
environment. If the specified <a href="../env.html">environment
variable</a> is set for the request (or is not set, in the case
- of a '<code>env=!<em>name</em></code>' clause), then the
+ of a '<code>env=!<var>name</var></code>' clause), then the
request will be logged.</p>
- <p>Environment variables can be set on a <em>per</em>-request
+ <p>Environment variables can be set on a per-request
basis using the <module>mod_setenvif</module>
and/or <module>mod_rewrite</module> modules. For
example, if you want to record requests for all GIF
images on your server in a separate logfile but not in your main
log, you can use:</p>
-<example>
- SetEnvIf Request_URI \.gif$ gif-image<br />
- CustomLog gif-requests.log common env=gif-image<br />
- CustomLog nongif-requests.log common env=!gif-image
-</example>
+ <example>
+ SetEnvIf Request_URI \.gif$ gif-image<br />
+ CustomLog gif-requests.log common env=gif-image<br />
+ CustomLog nongif-requests.log common env=!gif-image
+ </example>
</usage>
-
</directivesynopsis>
<directivesynopsis>
<name>LogFormat</name>
<description>Describes a format for use in a log file</description>
-<syntax>LogFormat
- <em>format</em>|<em>nickname</em> [<em>nickname</em>]</syntax>
+<syntax>LogFormat <var>format</var>|<var>nickname</var>
+[<var>nickname</var>]</syntax>
<default>LogFormat "%h %l %u %t \"%r\" %>s %b"</default>
-<contextlist><context>server config</context><context>virtual
-host</context></contextlist>
-<compatibility>Nickname only available in Apache 1.3 or later.
-</compatibility>
+<contextlist><context>server config</context><context>virtual host</context>
+</contextlist>
<usage>
<p>This directive specifies the format of the access log
this directive sets the log format which will be used by logs
specified in subsequent <directive>TransferLog</directive>
directives. The single argument can specify an explicit
- <
em>format</em> as discussed in <a href="#formats">custom log
+ <
var>format</var> as discussed in <a href="#formats">custom log
formats</a> section above. Alternatively, it can use a
- <em>nickname</em> to refer to a log format defined in a
+ <var>nickname</var> to refer to a log format defined in a
previous <directive>LogFormat</directive> directive as described
below.</p>
<p>The second form of the <directive>LogFormat</directive>
- directive associates an explicit <em>format</em> with a
- <em>nickname</em>. This <em>nickname</em> can then be used in
+ directive associates an explicit <var>format</var> with a
+ <var>nickname</var>. This <var>nickname</var> can then be used in
subsequent <directive>LogFormat</directive> or
- <directive>CustomLog</directive> directives rather than
- repeating the entire format string. A
- <directive>LogFormat</directive>
- directive that defines a nickname <strong>does nothing
- else</strong> -- that is, it <em>only</em> defines the
- nickname, it doesn't actually apply the format and make it the
- default. Therefore, it will not affect subsequent
- <directive>TransferLog</directive> directives. In addition,
- <directive>LogFormat</directive> cannot use one nickname
- to define another nickname.</p>
-
- <p>For example:</p>
-
- <example>LogFormat "%v %h %l %u %t \"%r\" %>s %b"
- vhost_common</example>
-
+ <directive module="mod_log_config">CustomLog</directive> directives
+ rather than repeating the entire format string. A
+ <directive>LogFormat</directive> directive that defines a nickname
+ <strong>does nothing else</strong> -- that is, it <em>only</em>
+ defines the nickname, it doesn't actually apply the format and make
+ it the default. Therefore, it will not affect subsequent
+ <directive module="mod_log_config">TransferLog</directive> directives.
+ In addition, <directive>LogFormat</directive> cannot use one nickname
+ to define another nickname. Note, that the nickname should not contain
+ percent signs (<code>%</code>).</p>
+
+ <example><title>Example</title>
+ LogFormat "%v %h %l %u %t \"%r\" %>s %b" vhost_common
+ </example>
</usage>
</directivesynopsis>
<directivesynopsis>
-
<name>TransferLog</name>
<description>Specifly location of a log file</description>
-<syntax>TransferLog <em>file</em>|<em>pipe</em></syntax>
-<contextlist><context>server config</context><context>virtual
-host</context></contextlist>
-<compatibility></compatibility>
+<syntax>TransferLog <var>file</var>|<var>pipe</var></syntax>
+<contextlist><context>server config</context><context>virtual host</context>
+</contextlist>
<usage>
-
<p>This directive has exactly the same arguments and effect as
- the <directive>CustomLog</directive> directive, with the
- exception that it does not allow the log format to be specified
- explicitly or for conditional logging of requests. Instead, the
- log format is determined by the most recently specified
- <directive>LogFormat</directive> directive (which
- does not define a nickname). Common Log Format is used if no
+ the <directive module="mod_log_config">CustomLog</directive>
+ directive, with the exception that it does not allow the log format
+ to be specified explicitly or for conditional logging of requests.
+ Instead, the log format is determined by the most recently specified
+ <directive module="mod_log_config">LogFormat</directive> directive
+ (which does not define a nickname). Common Log Format is used if no
other format has been specified.</p>
- <p>Example:</p>
-<example>
- LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-agent}i\""<br />
- TransferLog logs/access_log
-</example>
-
+ <example><title>Example</title>
+ LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-agent}i\""<br />
+ TransferLog logs/access_log
+ </example>
</usage>
-
</directivesynopsis>
</modulesynopsis>
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