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+<p class="menu"><a href="./mod/">Modules</a> | <a href="./mod/quickreference.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="./glossary.html">Glossary</a> | <a href="./sitemap.html">Sitemap</a></p>
+<p class="apache">Apache HTTP Server Version 2.5</p>
+<img alt="" src="./images/feather.gif" /></div>
+<div class="up"><a href="./"><img title="<-" alt="<-" src="./images/left.gif" /></a></div>
+<div id="path">
+<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="./">Version 2.5</a></div><div id="page-content"><div id="preamble"><h1>Log Files</h1>
+<div class="toplang">
+<p><span>Available Languages: </span><a href="./en/logs.html" title="English"> en </a> |
+<a href="./fr/logs.html" hreflang="fr" rel="alternate" title="Français"> fr </a> |
+<a href="./ja/logs.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
+<a href="./ko/logs.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> |
+<a href="./tr/logs.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </a></p>
+</div>
<p>In order to effectively manage a web server, it is necessary
to get feedback about the activity and performance of the
- server as well as any problems that may be occuring. The Apache
- HTTP Server provides very comprehensive and flexible logging
+ server as well as any problems that may be occurring. The Apache HTTP Server
+ provides very comprehensive and flexible logging
capabilities. This document describes how to configure its
logging capabilities, and how to understand what the logs
contain.</p>
-
- <ul>
- <li><a href="#security">Security Warning</a></li>
-
- <li><a href="#errorlog">Error Log</a></li>
-
- <li>
- <a href="#accesslog">Access Log</a>
-
- <ul>
- <li><a href="#common">Common Log Format</a></li>
-
- <li><a href="#combined">Combined Log Format</a></li>
-
- <li><a href="#multiple">Multiple Access Logs</a></li>
-
- <li><a href="#conditional">Conditional Logging</a></li>
- </ul>
- </li>
-
- <li><a href="#rotation">Log Rotation</a></li>
-
- <li><a href="#piped">Piped Logs</a></li>
-
- <li><a href="#virtualhosts">VirtualHosts</a></li>
-
- <li>
- <a href="#other">Other Log Files</a>
-
- <ul>
- <li><a href="#pidfile">PID File</a></li>
-
- <li><a href="#scriptlog">Script Log</a></li>
-
- <li><a href="#rewritelog">Rewrite Log</a></li>
- </ul>
- </li>
- </ul>
- <hr />
-
- <h2><a id="security" name="security">Security Warning</a></h2>
-
- <p>Anyone who can write to the directory where Apache is
+ </div>
+<div id="quickview"><ul id="toc"><li><img alt="" src="./images/down.gif" /> <a href="#overview">Overview</a></li>
+<li><img alt="" src="./images/down.gif" /> <a href="#security">Security Warning</a></li>
+<li><img alt="" src="./images/down.gif" /> <a href="#errorlog">Error Log</a></li>
+<li><img alt="" src="./images/down.gif" /> <a href="#permodule">Per-module logging</a></li>
+<li><img alt="" src="./images/down.gif" /> <a href="#accesslog">Access Log</a></li>
+<li><img alt="" src="./images/down.gif" /> <a href="#rotation">Log Rotation</a></li>
+<li><img alt="" src="./images/down.gif" /> <a href="#piped">Piped Logs</a></li>
+<li><img alt="" src="./images/down.gif" /> <a href="#virtualhost">Virtual Hosts</a></li>
+<li><img alt="" src="./images/down.gif" /> <a href="#other">Other Log Files</a></li>
+</ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
+<div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="overview" id="overview">Overview</a></h2>
+
+
+ <table class="related"><tr><th>Related Modules</th><th>Related Directives</th></tr><tr><td><ul><li><code class="module"><a href="./mod/mod_log_config.html">mod_log_config</a></code></li><li><code class="module"><a href="./mod/mod_log_forensic.html">mod_log_forensic</a></code></li><li><code class="module"><a href="./mod/mod_logio.html">mod_logio</a></code></li><li><code class="module"><a href="./mod/mod_cgi.html">mod_cgi</a></code></li></ul></td><td /></tr></table>
+
+ <p>
+ The Apache HTTP Server provides a variety of different mechanisms for
+ logging everything that happens on your server, from the initial
+ request, through the URL mapping process, to the final resolution of
+ the connection, including any errors that may have occurred in the
+ process. In addition to this, third-party modules may provide logging
+ capabilities, or inject entries into the existing log files, and
+ applications such as CGI programs, or PHP scripts, or other handlers,
+ may send messages to the server error log.
+ </p>
+
+ <p>
+ In this document we discuss the logging modules that are a standard
+ part of the http server.
+ </p>
+
+ </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="security" id="security">Security Warning</a></h2>
+
+
+ <p>Anyone who can write to the directory where Apache httpd is
writing a log file can almost certainly gain access to the uid
that the server is started as, which is normally root. Do
<em>NOT</em> give people write access to the directory the logs
possible for malicious clients to insert control-characters in
the log files, so care must be taken in dealing with raw
logs.</p>
- <hr />
+ </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="errorlog" id="errorlog">Error Log</a></h2>
+
- <h2><a id="errorlog" name="errorlog">Error Log</a></h2>
-
- <table border="1">
- <tr>
- <td valign="top"><strong>Related Directives</strong><br />
- <br />
- <a href="mod/core.html#errorlog">ErrorLog</a><br />
- <a href="mod/core.html#loglevel">LogLevel</a> </td>
- </tr>
- </table>
+ <table class="related"><tr><th>Related Modules</th><th>Related Directives</th></tr><tr><td><ul><li><code class="module"><a href="./mod/core.html">core</a></code></li></ul></td><td><ul><li><code class="directive"><a href="./mod/core.html#errorlog">ErrorLog</a></code></li><li><code class="directive"><a href="./mod/core.html#errorlogformat">ErrorLogFormat</a></code></li><li><code class="directive"><a href="./mod/core.html#loglevel">LogLevel</a></code></li></ul></td></tr></table>
<p>The server error log, whose name and location is set by the
- <a href="mod/core.html#errorlog">ErrorLog</a> directive, is the
+ <code class="directive"><a href="./mod/core.html#errorlog">ErrorLog</a></code> directive, is the
most important log file. This is the place where Apache httpd
will send diagnostic information and record any errors that it
encounters in processing requests. It is the first place to
what went wrong and how to fix it.</p>
<p>The error log is usually written to a file (typically
- <code>error_log</code> on unix systems and
- <code>error.log</code> on Windows and OS/2). On unix systems it
+ <code>error_log</code> on Unix systems and
+ <code>error.log</code> on Windows and OS/2). On Unix systems it
is also possible to have the server send errors to
- <code>syslog</code> or <a href="#pipe">pipe them to a
+ <code>syslog</code> or <a href="#piped">pipe them to a
program</a>.</p>
- <p>The format of the error log is relatively free-form and
- descriptive. But there is certain information that is contained
- in most error log entries. For example, here is a typical
- message.</p>
+ <p>The format of the error log is defined by the <code class="directive"><a href="./mod/core.html#errorlogformat">ErrorLogFormat</a></code> directive, with which you
+ can customize what values are logged. A default is format defined
+ if you don't specify one. A typical log message follows:</p>
- <blockquote>
- <code>[Wed Oct 11 14:32:52 2000] [error] [client 127.0.0.1]
- client denied by server configuration:
- /export/home/live/ap/htdocs/test</code>
- </blockquote>
+ <div class="example"><p><code>
+ [Fri Sep 09 10:42:29.902022 2011] [core:error] [pid 35708:tid 4328636416]
+ [client 72.15.99.187] File does not exist: /usr/local/apache2/htdocs/favicon.ico
+ </code></p></div>
<p>The first item in the log entry is the date and time of the
- message. The second entry lists the severity of the error being
- reported. The <a href="mod/core.html#loglevel">LogLevel</a>
- directive is used to control the types of errors that are sent
- to the error log by restricting the severity level. The third
- entry gives the IP address of the client that generated the
- error. Beyond that is the message itself, which in this case
- indicates that the server has been configured to deny the
- client access. The server reports the file-system path (as
- opposed to the web path) of the requested document.</p>
+ message. The next is the module producing the message (core, in this
+ case) and the severity level of that message. This is followed by
+ the process ID and, if appropriate, the thread ID, of the process
+ that experienced the condition. Next, we have the client address
+ that made the request. And finally is the detailed error message,
+ which in this case indicates a request for a file that did not
+ exist.</p>
<p>A very wide variety of different messages can appear in the
error log. Most look similar to the example above. The error
information written to <code>stderr</code> by a CGI script will
be copied directly to the error log.</p>
- <p>It is not possible to customize the error log by adding or
- removing information. However, error log entries dealing with
- particular requests have corresponding entries in the <a
- href="#accesslog">access log</a>. For example, the above example
- entry corresponds to an access log entry with status code 403.
- Since it is possible to customize the access log, you can
- obtain more information about error conditions using that log
- file.</p>
+ <p>Putting a <code>%L</code> token in both the error log and the access
+ log will produce a log entry ID with which you can correlate the entry
+ in the error log with the entry in the access log. If
+ <code class="module"><a href="./mod/mod_unique_id.html">mod_unique_id</a></code> is loaded, its unique request ID will be
+ used as the log entry ID, too.</p>
<p>During testing, it is often useful to continuously monitor
- the error log for any problems. On unix systems, you can
+ the error log for any problems. On Unix systems, you can
accomplish this using:</p>
- <blockquote>
- <code>tail -f error_log</code>
- </blockquote>
- <hr />
-
- <h2><a id="accesslog" name="accesslog">Access Log</a></h2>
-
- <table border="1">
- <tr>
- <td valign="top"><strong>Related Modules</strong><br />
- <br />
- <a href="mod/mod_log_config.html">mod_log_config</a><br />
- </td>
-
- <td valign="top"><strong>Related Directives</strong><br />
- <br />
- <a
- href="mod/mod_log_config.html#customlog">CustomLog</a><br />
- <a
- href="mod/mod_log_config.html#logformat">LogFormat</a><br />
- <a href="mod/mod_setenvif.html#setenvif">SetEnvIf</a>
- </td>
- </tr>
- </table>
+ <div class="example"><p><code>
+ tail -f error_log
+ </code></p></div>
+ </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="permodule" id="permodule">Per-module logging</a></h2>
+
+
+ <p>The <code class="directive"><a href="./mod/core.html#loglevel">LogLevel</a></code> directive
+ allows you to specify a log severity level on a per-module basis. In
+ this way, if you are troubleshooting a problem with just one
+ particular module, you can turn up its logging volume without also
+ getting the details of other modules that you're not interested in.
+ This is particularly useful for modules such as
+ <code class="module"><a href="./mod/mod_proxy.html">mod_proxy</a></code> or <code class="module"><a href="./mod/mod_rewrite.html">mod_rewrite</a></code> where you
+ want to know details about what it's trying to do.</p>
+
+ <p>Do this by specifying the name of the module in your
+ <code class="directive">LogLevel</code> directive:</p>
+
+ <pre class="prettyprint lang-config">LogLevel info rewrite:trace5</pre>
+
+
+ <p>This sets the main <code class="directive">LogLevel</code> to info, but
+ turns it up to <code>trace5</code> for
+ <code class="module"><a href="./mod/mod_rewrite.html">mod_rewrite</a></code>.</p>
+
+ <div class="note">This replaces the per-module logging directives, such as
+ <code>RewriteLog</code>, that were present in earlier versions of
+ the server.</div>
+ </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="accesslog" id="accesslog">Access Log</a></h2>
+
+
+ <table class="related"><tr><th>Related Modules</th><th>Related Directives</th></tr><tr><td><ul><li><code class="module"><a href="./mod/mod_log_config.html">mod_log_config</a></code></li><li><code class="module"><a href="./mod/mod_setenvif.html">mod_setenvif</a></code></li></ul></td><td><ul><li><code class="directive"><a href="./mod/mod_log_config.html#customlog">CustomLog</a></code></li><li><code class="directive"><a href="./mod/mod_log_config.html#logformat">LogFormat</a></code></li><li><code class="directive"><a href="./mod/mod_setenvif.html#setenvif">SetEnvIf</a></code></li></ul></td></tr></table>
<p>The server access log records all requests processed by the
server. The location and content of the access log are
- controlled by the <a
- href="mod/mod_log_config.html#customlog">CustomLog</a>
- directive. The <a
- href="mod/mod_log_config.html#logformat">LogFormat</a>
- directive can be used to simplify the selection of the contents
- of the logs. This section describes how to configure the server
+ controlled by the <code class="directive"><a href="./mod/mod_log_config.html#customlog">CustomLog</a></code>
+ directive. The <code class="directive"><a href="./mod/mod_log_config.html#logformat">LogFormat</a></code>
+ directive can be used to simplify the selection of
+ the contents of the logs. This section describes how to configure the server
to record information in the access log.</p>
<p>Of course, storing the information in the access log is only
general is beyond the scope of this document, and not really
part of the job of the web server itself. For more information
about this topic, and for applications which perform log
- analysis, check the <a
- href="http://dmoz.org/Computers/Software/Internet/Site_Management/Log_analysis/">
- Open Directory</a> or <a
- href="http://dir.yahoo.com/Computers_and_Internet/Software/Internet/World_Wide_Web/Servers/Log_Analysis_Tools/">
+ analysis, check the <a href="http://dmoz.org/Computers/Software/Internet/Site_Management/Log_analysis/">
+ Open Directory</a> or <a href="http://dir.yahoo.com/Computers_and_Internet/Software/Internet/World_Wide_Web/Servers/Log_Analysis_Tools/">
Yahoo</a>.</p>
<p>Various versions of Apache httpd have used other modules and
directives to control access logging, including
mod_log_referer, mod_log_agent, and the
- <code>TransferLog</code> directive. The <code>CustomLog</code>
- directive now subsumes the functionality of all the older
- directives.</p>
-
- <p>The format of the access log is highly configurable. The
- format is specified using a <a
- href="mod/mod_log_config.html#format">format string</a> that
- looks much like a C-style printf(1) format string. Some
- examples are presented in the next sections. For a complete
- list of the possible contents of the format string, see the <a
- href="mod/mod_log_config.html">mod_log_config
- documentation</a>.</p>
-
- <h3><a id="common" name="common">Common Log Format</a></h3>
-
- <p>A typical configuration for the access log might look as
- follows.</p>
-
- <blockquote>
- <code>LogFormat "%h %l %u %t \"%r\" %>s %b" common<br />
- CustomLog logs/access_log common</code>
- </blockquote>
-
- <p>This defines the <em>nickname</em> <code>common</code> and
- associates it with a particular log format string. The format
- string consists of percent directives, each of which tell the
- server to log a particular piece of information. Literal
- characters may also be placed in the format string and will be
- copied directly into the log output. The quote character
- (<code>"</code>) must be escaped by placing a back-slash before
- it to prevent it from being interpreted as the end of the
- format string. The format string may also contain the special
- control characters "<code>\n</code>" for new-line and
- "<code>\t</code>" for tab.</p>
-
- <p>The <code>CustomLog</code> directive sets up a new log file
- using the defined <em>nickname</em>. The filename for the
- access log is relative to the <a
- href="mod/core.html#serverroot">ServerRoot</a> unless it begins
- with a slash.</p>
-
- <p>The above configuration will write log entries in a format
- known as the Common Log Format (CLF). This standard format can
- be produced by many different web servers and read by many log
- analysis programs. The log file entries produced in CLF will
- look something like this:</p>
-
- <blockquote>
- <code>127.0.0.1 - frank [10/Oct/2000:13:55:36 -0700] "GET
- /apache_pb.gif HTTP/1.0" 200 2326</code>
- </blockquote>
-
- <p>Each part of this log entry is described below.</p>
-
- <dl>
- <dt><code>127.0.0.1</code> (<code>%h</code>)</dt>
-
- <dd>This is the IP address of the client (remote host) which
- made the request to the server. If <a
- href="mod/core.html#hostnamelookups">HostnameLookups</a> is
- set to <code>On</code>, then the server will try to determine
- the hostname and log it in place of the IP address. However,
- this configuration is not recommended since it can
- significantly slow the server. Instead, it is best to use a
- log post-processor such as <a
- href="programs/logresolve.html">logresolve</a> to determine
- the hostnames. The IP address reported here is not
- necessarily the address of the machine at which the user is
- sitting. If a proxy server exists between the user and the
- server, this address will be the address of the proxy, rather
- than the originating machine.</dd>
-
- <dt><code>-</code> (<code>%l</code>)</dt>
-
- <dd>The "hyphen" in the output indicates that the requested
- piece of information is not available. In this case, the
- information that is not available is the RFC 1413 identity of
- the client determined by <code>identd</code> on the clients
- machine. This information is highly unreliable and should
- almost never be used except on tightly controlled internal
- networks. Apache httpd will not even attempt to determine
- this information unless <a
- href="mod/core.html#identitycheck">IdentityCheck</a> is set
- to <code>On</code>.</dd>
-
- <dt><code>frank</code> (<code>%u</code>)</dt>
-
- <dd>This is the userid of the person requesting the document
- as determined by HTTP authentication. The same value is
- typically provided to CGI scripts in the
- <code>REMOTE_USER</code> environment variable. If the status
- code for the request (see below) is 401, then this value
- should not be trusted because the user is not yet
- authenticated. If the document is not password protected,
- this entry will be "<code>-</code>" just like the previous
- one.</dd>
-
- <dt><code>[10/Oct/2000:13:55:36 -0700]</code>
- (<code>%t</code>)</dt>
-
- <dd>
- The time that the server finished processing the request.
- The format is:
-
- <blockquote>
- <code>[day/month/year:hour:minute:second zone]<br />
- day = 2*digit<br />
- month = 3*letter<br />
- year = 4*digit<br />
- hour = 2*digit<br />
- minute = 2*digit<br />
- second = 2*digit<br />
- zone = (`+' | `-') 4*digit</code>
- </blockquote>
- It is possible to have the time displayed in another format
- by specifying <code>%{format}t</code> in the log format
- string, where <code>format</code> is as in
- <code>strftime(3)</code> from the C standard library.
- </dd>
-
- <dt><code>"GET /apache_pb.gif HTTP/1.0"</code>
- (<code>\"%r\"</code>)</dt>
-
- <dd>The request line from the client is given in double
- quotes. The request line contains a great deal of useful
- information. First, the method used by the client is
- <code>GET</code>. Second, the client requested the resource
- <code>/apache_pb.gif</code>, and third, the client used the
- protocol <code>HTTP/1.0</code>. It is also possible to log
- one or more parts of the request line independently. For
- example, the format string "<code>%m %U%q %H</code>" will log
- the method, path, query-string, and protocol, resulting in
- exactly the same output as "<code>%r</code>".</dd>
-
- <dt><code>200</code> (<code>%>s</code>)</dt>
-
- <dd>This is the status code that the server sends back to the
- client. This information is very valuable, because it reveals
- whether the request resulted in a successful response (codes
- beginning in 2), a redirection (codes beginning in 3), an
- error caused by the client (codes beginning in 4), or an
- error in the server (codes beginning in 5). The full list of
- possible status codes can be found in the <a
- href="http://www.w3.org/Protocols/rfc2616/rfc2616.txt">HTTP
- specification</a> (RFC2616 section 10).</dd>
-
- <dt><code>2326</code> (<code>%b</code>)</dt>
-
- <dd>The last entry indicates the size of the object returned
- to the client, not including the response headers. If no
- content was returned to the client, this value will be
- "<code>-</code>". To log "<code>0</code>" for no content, use
- <code>%B</code> instead.</dd>
- </dl>
-
- <h4><a id="combined" name="combined">Combined Log
- Format</a></h4>
-
- <p>Another commonly used format string is called the Combined
- Log Format. It can be used as follows.</p>
-
- <blockquote>
- <code>LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\"
- \"%{User-agent}i\"" combined<br />
- CustomLog log/acces_log combined</code>
- </blockquote>
-
- <p>This format is exactly the same as the Common Log Format,
- with the addition of two more fields. Each of the additional
- fields uses the percent-directive
- <code>%{<em>header</em>}i</code>, where <em>header</em> can be
- any HTTP request header. The access log under this format will
- look like:</p>
-
- <blockquote>
- <code>127.0.0.1 - frank [10/Oct/2000:13:55:36 -0700] "GET
- /apache_pb.gif HTTP/1.0" 200 2326
- "http://www.example.com/start.html" "Mozilla/4.08 [en]
- (Win98; I ;Nav)"</code>
- </blockquote>
-
- <p>The additional fields are:</p>
-
- <dl>
- <dt><code>"http://www.example.com/start.html"</code>
- (<code>\"%{Referer}i\"</code>)</dt>
-
- <dd>The "Referer" (sic) HTTP request header. This gives the
- site that the client reports having been referred from. (This
- should be the page that links to or includes
- <code>/apache_pb.gif</code>).</dd>
-
- <dt><code>"Mozilla/4.08 [en] (Win98; I ;Nav)"</code>
- (<code>\"%{User-agent}i\"</code>)</dt>
-
- <dd>The User-Agent HTTP request header. This is the
- identifying information that the client browser reports about
- itself.</dd>
- </dl>
-
- <h3><a id="multiple" name="multiple">Multiple Access
- Logs</a></h3>
-
- <p>Multiple access logs can be created simply by specifying
- multiple <code>CustomLog</code> directives in the configuration
- file. For example, the following directives will create three
- access logs. The first contains the basic CLF information,
- while the second and third contain referer and browser
- information. The last two <code>CustomLog</code> lines show how
- to mimic the effects of the <code>ReferLog</code> and
- <code>AgentLog</code> directives.</p>
-
- <blockquote>
- <code>LogFormat "%h %l %u %t \"%r\" %>s %b" common<br />
- CustomLog logs/access_log common<br />
- CustomLog logs/referer_log "%{Referer}i -> %U"<br />
- CustomLog logs/agent_log "%{User-agent}i"</code>
- </blockquote>
-
- <p>This example also shows that it is not necessary to define a
- nickname with the <code>LogFormat</code> directive. Instead,
- the log format can be specified directly in the
- <code>CustomLog</code> directive.</p>
-
- <h3><a id="conditional" name="conditional">Conditional
- Logging</a></h3>
-
- <p>There are times when it is convenient to exclude certain
- entries from the access logs based on characteristics of the
- client request. This is easily accomplished with the help of <a
- href="env.html">environment variables</a>. First, an
- environment variable must be set to indicate that the request
- meets certain conditions. This is usually accomplished with <a
- href="mod/mod_setenvif.html#setenvif">SetEnvIf</a>. Then the
- <code>env=</code> clause of the <code>CustomLog</code>
- directive is used to include or exclude requests where the
- environment variable is set. Some examples:</p>
-
- <blockquote>
- <code># Mark requests from the loop-back interface<br />
- SetEnvIf Remote_Addr "127\.0\.0\.1" dontlog<br />
- # Mark requests for the robots.txt file<br />
- SetEnvIf Request_URI "^/robots\.txt$" dontlog<br />
- # Log what remains<br />
- CustomLog logs/access_log common env=!dontlog</code>
- </blockquote>
-
- <p>As another example, consider logging requests from
- english-speakers to one log file, and non-english speakers to a
- different log file.</p>
-
- <blockquote>
- <code>SetEnvIf Accept-Language "en" english<br />
- CustomLog logs/english_log common env=english<br />
- CustomLog logs/non_english_log common env=!english</code>
- </blockquote>
-
- <p>Although we have just shown that conditional logging is very
- powerful and flexibly, it is not the only way to control the
- contents of the logs. Log files are more useful when they
- contain a complete record of server activity. It is often
- easier to simply post-process the log files to remove requests
- that you do not want to consider.</p>
- <hr />
-
- <h2><a id="rotation" name="rotation">Log Rotation</a></h2>
+ <code>TransferLog</code> directive. The <code class="directive"><a href="./mod/mod_log_config.html#customlog">CustomLog</a></code> directive now subsumes
+ the functionality of all the older directives.</p>
+
+ <p>The format of the access log is highly configurable. The format
+ is specified using a format string that looks much like a C-style
+ printf(1) format string. Some examples are presented in the next
+ sections. For a complete list of the possible contents of the
+ format string, see the <code class="module"><a href="./mod/mod_log_config.html">mod_log_config</a></code> <a href="mod/mod_log_config.html#formats">format strings</a>.</p>
+
+ <h3><a name="common" id="common">Common Log Format</a></h3>
+
+
+ <p>A typical configuration for the access log might look as
+ follows.</p>
+
+ <pre class="prettyprint lang-config">LogFormat "%h %l %u %t \"%r\" %>s %b" common
+CustomLog logs/access_log common</pre>
+
+
+ <p>This defines the <em>nickname</em> <code>common</code> and
+ associates it with a particular log format string. The format
+ string consists of percent directives, each of which tell the
+ server to log a particular piece of information. Literal
+ characters may also be placed in the format string and will be
+ copied directly into the log output. The quote character
+ (<code>"</code>) must be escaped by placing a backslash before
+ it to prevent it from being interpreted as the end of the
+ format string. The format string may also contain the special
+ control characters "<code>\n</code>" for new-line and
+ "<code>\t</code>" for tab.</p>
+
+ <p>The <code class="directive"><a href="./mod/mod_log_config.html#customlog">CustomLog</a></code>
+ directive sets up a new log file using the defined
+ <em>nickname</em>. The filename for the access log is relative to
+ the <code class="directive"><a href="./mod/core.html#serverroot">ServerRoot</a></code> unless it
+ begins with a slash.</p>
+
+ <p>The above configuration will write log entries in a format
+ known as the Common Log Format (CLF). This standard format can
+ be produced by many different web servers and read by many log
+ analysis programs. The log file entries produced in CLF will
+ look something like this:</p>
+
+ <div class="example"><p><code>
+ 127.0.0.1 - frank [10/Oct/2000:13:55:36 -0700] "GET
+ /apache_pb.gif HTTP/1.0" 200 2326
+ </code></p></div>
+
+ <p>Each part of this log entry is described below.</p>
+
+ <dl>
+ <dt><code>127.0.0.1</code> (<code>%h</code>)</dt>
+
+ <dd>This is the IP address of the client (remote host) which
+ made the request to the server. If <code class="directive"><a href="./mod/core.html#hostnamelookups">HostnameLookups</a></code> is
+ set to <code>On</code>, then the server will try to determine
+ the hostname and log it in place of the IP address. However,
+ this configuration is not recommended since it can
+ significantly slow the server. Instead, it is best to use a
+ log post-processor such as <code class="program"><a href="./programs/logresolve.html">logresolve</a></code> to determine
+ the hostnames. The IP address reported here is not
+ necessarily the address of the machine at which the user is
+ sitting. If a proxy server exists between the user and the
+ server, this address will be the address of the proxy, rather
+ than the originating machine.</dd>
+
+ <dt><code>-</code> (<code>%l</code>)</dt>
+
+ <dd>The "hyphen" in the output indicates that the requested
+ piece of information is not available. In this case, the
+ information that is not available is the RFC 1413 identity of
+ the client determined by <code>identd</code> on the clients
+ machine. This information is highly unreliable and should
+ almost never be used except on tightly controlled internal
+ networks. Apache httpd will not even attempt to determine
+ this information unless <code class="directive"><a href="./mod/mod_ident.html#identitycheck">IdentityCheck</a></code> is set
+ to <code>On</code>.</dd>
+
+ <dt><code>frank</code> (<code>%u</code>)</dt>
+
+ <dd>This is the userid of the person requesting the document
+ as determined by HTTP authentication. The same value is
+ typically provided to CGI scripts in the
+ <code>REMOTE_USER</code> environment variable. If the status
+ code for the request (see below) is 401, then this value
+ should not be trusted because the user is not yet
+ authenticated. If the document is not password protected,
+ this part will be "<code>-</code>" just like the previous
+ one.</dd>
+
+ <dt><code>[10/Oct/2000:13:55:36 -0700]</code>
+ (<code>%t</code>)</dt>
+
+ <dd>
+ The time that the request was received.
+ The format is:
+
+ <p class="indent">
+ <code>[day/month/year:hour:minute:second zone]<br />
+ day = 2*digit<br />
+ month = 3*letter<br />
+ year = 4*digit<br />
+ hour = 2*digit<br />
+ minute = 2*digit<br />
+ second = 2*digit<br />
+ zone = (`+' | `-') 4*digit</code>
+ </p>
+ <p>It is possible to have the time displayed in another format
+ by specifying <code>%{format}t</code> in the log format
+ string, where <code>format</code> is either as in
+ <code>strftime(3)</code> from the C standard library,
+ or one of the supported special tokens. For details see
+ the <code class="module"><a href="./mod/mod_log_config.html">mod_log_config</a></code> <a href="mod/mod_log_config.html#formats">format strings</a>.</p>
+ </dd>
+
+ <dt><code>"GET /apache_pb.gif HTTP/1.0"</code>
+ (<code>\"%r\"</code>)</dt>
+
+ <dd>The request line from the client is given in double
+ quotes. The request line contains a great deal of useful
+ information. First, the method used by the client is
+ <code>GET</code>. Second, the client requested the resource
+ <code>/apache_pb.gif</code>, and third, the client used the
+ protocol <code>HTTP/1.0</code>. It is also possible to log
+ one or more parts of the request line independently. For
+ example, the format string "<code>%m %U%q %H</code>" will log
+ the method, path, query-string, and protocol, resulting in
+ exactly the same output as "<code>%r</code>".</dd>
+
+ <dt><code>200</code> (<code>%>s</code>)</dt>
+
+ <dd>This is the status code that the server sends back to the
+ client. This information is very valuable, because it reveals
+ whether the request resulted in a successful response (codes
+ beginning in 2), a redirection (codes beginning in 3), an
+ error caused by the client (codes beginning in 4), or an
+ error in the server (codes beginning in 5). The full list of
+ possible status codes can be found in the <a href="http://www.w3.org/Protocols/rfc2616/rfc2616.txt">HTTP
+ specification</a> (RFC2616 section 10).</dd>
+
+ <dt><code>2326</code> (<code>%b</code>)</dt>
+
+ <dd>The last part indicates the size of the object returned
+ to the client, not including the response headers. If no
+ content was returned to the client, this value will be
+ "<code>-</code>". To log "<code>0</code>" for no content, use
+ <code>%B</code> instead.</dd>
+ </dl>
+
+
+ <h3><a name="combined" id="combined">Combined Log Format</a></h3>
+
+
+ <p>Another commonly used format string is called the Combined
+ Log Format. It can be used as follows.</p>
+
+ <pre class="prettyprint lang-config">LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-agent}i\"" combined
+CustomLog log/access_log combined</pre>
+
+
+ <p>This format is exactly the same as the Common Log Format,
+ with the addition of two more fields. Each of the additional
+ fields uses the percent-directive
+ <code>%{<em>header</em>}i</code>, where <em>header</em> can be
+ any HTTP request header. The access log under this format will
+ look like:</p>
+
+ <div class="example"><p><code>
+ 127.0.0.1 - frank [10/Oct/2000:13:55:36 -0700] "GET
+ /apache_pb.gif HTTP/1.0" 200 2326
+ "http://www.example.com/start.html" "Mozilla/4.08 [en]
+ (Win98; I ;Nav)"
+ </code></p></div>
+
+ <p>The additional fields are:</p>
+
+ <dl>
+ <dt><code>"http://www.example.com/start.html"</code>
+ (<code>\"%{Referer}i\"</code>)</dt>
+
+ <dd>The "Referer" (sic) HTTP request header. This gives the
+ site that the client reports having been referred from. (This
+ should be the page that links to or includes
+ <code>/apache_pb.gif</code>).</dd>
+
+ <dt><code>"Mozilla/4.08 [en] (Win98; I ;Nav)"</code>
+ (<code>\"%{User-agent}i\"</code>)</dt>
+
+ <dd>The User-Agent HTTP request header. This is the
+ identifying information that the client browser reports about
+ itself.</dd>
+ </dl>
+
+
+ <h3><a name="multiple" id="multiple">Multiple Access Logs</a></h3>
+
+
+ <p>Multiple access logs can be created simply by specifying
+ multiple <code class="directive"><a href="./mod/mod_log_config.html#customlog">CustomLog</a></code>
+ directives in the configuration
+ file. For example, the following directives will create three
+ access logs. The first contains the basic CLF information,
+ while the second and third contain referer and browser
+ information. The last two <code class="directive"><a href="./mod/mod_log_config.html#customlog">CustomLog</a></code> lines show how
+ to mimic the effects of the <code>ReferLog</code> and <code>AgentLog</code> directives.</p>
+
+ <pre class="prettyprint lang-config">LogFormat "%h %l %u %t \"%r\" %>s %b" common
+CustomLog logs/access_log common
+CustomLog logs/referer_log "%{Referer}i -> %U"
+CustomLog logs/agent_log "%{User-agent}i"</pre>
+
+
+ <p>This example also shows that it is not necessary to define a
+ nickname with the <code class="directive"><a href="./mod/mod_log_config.html#logformat">LogFormat</a></code> directive. Instead,
+ the log format can be specified directly in the <code class="directive"><a href="./mod/mod_log_config.html#customlog">CustomLog</a></code> directive.</p>
+
+
+ <h3><a name="conditional" id="conditional">Conditional Logs</a></h3>
+
+
+ <p>There are times when it is convenient to exclude certain
+ entries from the access logs based on characteristics of the
+ client request. This is easily accomplished with the help of <a href="env.html">environment variables</a>. First, an
+ environment variable must be set to indicate that the request
+ meets certain conditions. This is usually accomplished with
+ <code class="directive"><a href="./mod/mod_setenvif.html#setenvif">SetEnvIf</a></code>. Then the
+ <code>env=</code> clause of the <code class="directive"><a href="./mod/mod_log_config.html#customlog">CustomLog</a></code> directive is used to
+ include or exclude requests where the environment variable is
+ set. Some examples:</p>
+
+ <pre class="prettyprint lang-config"># Mark requests from the loop-back interface
+SetEnvIf Remote_Addr "127\.0\.0\.1" dontlog
+# Mark requests for the robots.txt file
+SetEnvIf Request_URI "^/robots\.txt$" dontlog
+# Log what remains
+CustomLog logs/access_log common env=!dontlog</pre>
+
+
+ <p>As another example, consider logging requests from
+ english-speakers to one log file, and non-english speakers to a
+ different log file.</p>
+
+ <pre class="prettyprint lang-config"> SetEnvIf Accept-Language "en" english<br />
+ CustomLog logs/english_log common env=english<br />
+ CustomLog logs/non_english_log common env=!english</pre>
+
+
+ <p>In a caching scenario one would want to know about
+ the efficiency of the cache. A very simple method to
+ find this out would be:</p>
+
+ <pre class="prettyprint lang-config">SetEnv CACHE_MISS 1
+LogFormat "%h %l %u %t "%r " %>s %b %{CACHE_MISS}e" common-cache
+CustomLog logs/access_log common-cache</pre>
+
+
+ <p><code class="module"><a href="./mod/mod_cache.html">mod_cache</a></code> will run before
+ <code class="module"><a href="./mod/mod_env.html">mod_env</a></code> and, when successful, will deliver the
+ content without it. In that case a cache hit will log
+ <code>-</code>, while a cache miss will log <code>1</code>.</p>
+
+ <p>In addition to the <code>env=</code> syntax, <code class="directive"><a href="./mod/mod_log_config.html#logformat">LogFormat</a></code> supports logging values
+ conditional upon the HTTP response code:</p>
+
+ <pre class="prettyprint lang-config">LogFormat "%400,501{User-agent}i" browserlog
+LogFormat "%!200,304,302{Referer}i" refererlog</pre>
+
+
+ <p>In the first example, the <code>User-agent</code> will be
+ logged if the HTTP status code is 400 or 501. In other cases, a
+ literal "-" will be logged instead. Likewise, in the second
+ example, the <code>Referer</code> will be logged if the HTTP
+ status code is <strong>not</strong> 200, 204, or 302. (Note the
+ "!" before the status codes.</p>
+
+ <p>Although we have just shown that conditional logging is very
+ powerful and flexible, it is not the only way to control the
+ contents of the logs. Log files are more useful when they
+ contain a complete record of server activity. It is often
+ easier to simply post-process the log files to remove requests
+ that you do not want to consider.</p>
+
+ </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="rotation" id="rotation">Log Rotation</a></h2>
+
<p>On even a moderately busy server, the quantity of
information stored in the log files is very large. The access
log file typically grows 1 MB or more per 10,000 requests. It
will consequently be necessary to periodically rotate the log
files by moving or deleting the existing logs. This cannot be
- done while the server is running, because Apache will continue
+ done while the server is running, because Apache httpd will continue
writing to the old log file as long as it holds the file open.
- Instead, the server must be <a
- href="stopping.html">restarted</a> after the log files are
+ Instead, the server must be <a href="stopping.html">restarted</a> after the log files are
moved or deleted so that it will open new log files.</p>
<p>By using a <em>graceful</em> restart, the server can be
scenario that simply rotates the logs and compresses the old
logs to save space is:</p>
- <blockquote>
- <code>mv access_log access_log.old<br />
- mv error_log error_log.old<br />
- apachectl graceful<br />
- sleep 600<br />
- gzip access_log.old error_log.old</code>
- </blockquote>
+ <div class="example"><p><code>
+ mv access_log access_log.old<br />
+ mv error_log error_log.old<br />
+ apachectl graceful<br />
+ sleep 600<br />
+ gzip access_log.old error_log.old
+ </code></p></div>
- <p>Another way to perform log rotation is using <a
- href="#piped">piped logs</a> as discussed in the next
+ <p>Another way to perform log rotation is using <a href="#piped">piped logs</a> as discussed in the next
section.</p>
- <hr />
-
- <h2><a id="piped" name="piped">Piped Logs</a></h2>
+ </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="piped" id="piped">Piped Logs</a></h2>
+
<p>Apache httpd is capable of writing error and access log
files through a pipe to another process, rather than directly
In order to write logs to a pipe, simply replace the filename
with the pipe character "<code>|</code>", followed by the name
of the executable which should accept log entries on its
- standard input. Apache will start the piped-log process when
+ standard input. The server will start the piped-log process when
the server starts, and will restart it if it crashes while the
server is running. (This last feature is why we can refer to
this technique as "reliable piped logging".)</p>
that piped log programs usually run as root. It is therefore
very important to keep the programs simple and secure.</p>
- <p>Some simple examples using piped logs:</p>
+ <p>One important use of piped logs is to allow log rotation
+ without having to restart the server. The Apache HTTP Server
+ includes a simple program called <code class="program"><a href="./programs/rotatelogs.html">rotatelogs</a></code>
+ for this purpose. For example, to rotate the logs every 24 hours, you
+ can use:</p>
+
+ <pre class="prettyprint lang-config">CustomLog "|/usr/local/apache/bin/rotatelogs /var/log/access_log 86400" common</pre>
- <blockquote>
- <code># compressed logs<br />
- CustomLog "|/usr/bin/gzip -c >>
- /var/log/access_log.gz" common<br />
- # almost-real-time name resolution<br />
- CustomLog "|/usr/local/apache/bin/logresolve >>
- /var/log/access_log" common</code>
- </blockquote>
<p>Notice that quotes are used to enclose the entire command
that will be called for the pipe. Although these examples are
for the access log, the same technique can be used for the
error log.</p>
- <p>One important use of piped logs is to allow log rotation
- without having to restart the server. The Apache HTTP Server
- includes a simple program called <a
- href="programs/rotatelogs.html">rotatelogs</a> for this
- purpose. For example, to rotate the logs every 24 hours, you
- can use:</p>
-
- <blockquote>
- <code>CustomLog "|/usr/local/apache/bin/rotatelogs
- /var/log/access_log 86400" common</code>
- </blockquote>
-
- <p>A similar, but much more flexible log rotation program
+ <p>A similar but much more flexible log rotation program
called <a href="http://www.cronolog.org/">cronolog</a>
is available at an external site.</p>
<p>As with conditional logging, piped logs are a very powerful
tool, but they should not be used where a simpler solution like
off-line post-processing is available.</p>
- <hr />
- <h2><a id="virtualhosts" name="virtualhosts">Virtual
- Hosts</a></h2>
+ <p>By default the piped log process is spawned without invoking
+ a shell. Use "<code>|$</code>" instead of "<code>|</code>"
+ to spawn using a shell (usually with <code>/bin/sh -c</code>):</p>
+
+ <pre class="prettyprint lang-config"># Invoke "rotatelogs" using a shell
+CustomLog "|$/usr/local/apache/bin/rotatelogs /var/log/access_log 86400" common</pre>
+
+
+ <p>This was the default behaviour for Apache 2.2.
+ Depending on the shell specifics this might lead to
+ an additional shell process for the lifetime of the logging
+ pipe program and signal handling problems during restart.
+ For compatibility reasons with Apache 2.2 the notation
+ "<code>||</code>" is also supported and equivalent to using
+ "<code>|</code>".</p>
+ </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="virtualhost" id="virtualhost">Virtual Hosts</a></h2>
+
<p>When running a server with many <a href="vhosts/">virtual
hosts</a>, there are several options for dealing with log
files. First, it is possible to use logs exactly as in a
single-host server. Simply by placing the logging directives
- outside the <code><VirtualHost></code> sections in the
+ outside the <code class="directive"><a href="./mod/core.html#virtualhost"><VirtualHost></a></code> sections in the
main server context, it is possible to log all requests in the
same access log and error log. This technique does not allow
for easy collection of statistics on individual virtual
hosts.</p>
- <p>If <code>CustomLog</code> or <code>ErrorLog</code>
- directives are placed inside a <code><VirtualHost></code>
+ <p>If <code class="directive"><a href="./mod/mod_log_config.html#customlog">CustomLog</a></code>
+ or <code class="directive"><a href="./mod/core.html#errorlog">ErrorLog</a></code>
+ directives are placed inside a
+ <code class="directive"><a href="./mod/core.html#virtualhost"><VirtualHost></a></code>
section, all requests or errors for that virtual host will be
logged only to the specified file. Any virtual host which does
not have logging directives will still have its requests sent
to the main server logs. This technique is very useful for a
small number of virtual hosts, but if the number of hosts is
very large, it can be complicated to manage. In addition, it
- can often create problems with <a
- href="vhosts/fd-limits.html">insufficient file
+ can often create problems with <a href="vhosts/fd-limits.html">insufficient file
descriptors</a>.</p>
<p>For the access log, there is a very good compromise. By
later split the log into individual files. For example,
consider the following directives.</p>
- <blockquote>
- <code>LogFormat "%v %l %u %t \"%r\" %>s %b"
- comonvhost<br />
- CustomLog logs/access_log comonvhost</code>
- </blockquote>
+ <pre class="prettyprint lang-config">LogFormat "%v %l %u %t \"%r\" %>s %b" comonvhost
+CustomLog logs/access_log comonvhost</pre>
+
<p>The <code>%v</code> is used to log the name of the virtual
- host that is serving the request. Then a program like <a
- href="programs/other.html">split-logfile</a> can be used to
+ host that is serving the request. Then a program like <a href="programs/split-logfile.html">split-logfile</a> can be used to
post-process the access log in order to split it into one file
per virtual host.</p>
-
- <p>Unfortunately, no similar technique is available for the
- error log, so you must choose between mixing all virtual hosts
- in the same error log and using one error log per virtual
- host.</p>
- <hr />
-
- <h2><a id="other" name="other">Other Log Files</a></h2>
-
- <table border="1">
- <tr>
- <td valign="top"><strong>Related Modules</strong><br />
- <br />
- <a href="mod/mod_cgi.html">mod_cgi</a><br />
- <a href="mod/mod_rewrite.html">mod_rewrite</a> </td>
-
- <td valign="top"><strong>Related Directives</strong><br />
- <br />
- <a href="mod/core.html#pidfile">PidFile</a><br />
- <a
- href="mod/mod_rewrite.html#RewriteLog">RewriteLog</a><br />
- <a
- href="mod/mod_rewrite.html#RewriteLogLevel">RewriteLogLevel</a><br />
- <a href="mod/mod_cgi.html#scriptlog">ScriptLog</a><br />
- <a
- href="mod/mod_cgi.html#scriptloglength">ScriptLogLength</a><br />
- <a
- href="mod/mod_cgi.html#scriptlogbuffer">ScriptLogBuffer</a>
- </td>
- </tr>
- </table>
-
- <h3><a id="pidfile" name="pidfile">PID File</a></h3>
-
- <p>On startup, Apache httpd saves the process id of the parent
- httpd process to the file <code>logs/httpd.pid</code>. This
- filename can be changed with the <a
- href="mod/core.html#pidfile">PidFile</a> directive. The
- process-id is for use by the administrator in restarting and
- terminating the daemon by sending signals to the parent
- process; on Windows, use the -k command line option instead.
- For more information see the <a href="stopping.html">Stopping
- and Restarting</a> page.</p>
-
- <h3><a id="scriptlog" name="scriptlog">Script Log</a></h3>
-
- <p>In order to aid in debugging, the <a
- href="mod/mod_cgi.html#scriptlog">ScriptLog</a> directive
- allows you to record the input to and output from CGI scripts.
- This should only be used in testing - not for live servers.
- More information is available in the <a
- href="mod/mod_cgi.html">mod_cgi documentation</a>.</p>
-
- <h3><a id="rewritelog" name="rewritelog">Rewrite Log</a></h3>
-
- <p>When using the powerful and complex features of <a
- href="mod/mod_rewrite.html">mod_rewrite</a>, it is almost
- always necessary to use the <a
- href="mod/mod_rewrite.html#RewriteLog">RewriteLog</a> to help
- in debugging. This log file produces a detailed analysis of how
- the rewriting engine transforms requests. The level of detail
- is controlled by the <a
- href="mod/mod_rewrite.html#RewriteLogLevel">RewriteLogLevel</a>
- directive.</p>
- <!--#include virtual="footer.html" -->
- </body>
-</html>
-
+ </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="other" id="other">Other Log Files</a></h2>
+
+
+ <table class="related"><tr><th>Related Modules</th><th>Related Directives</th></tr><tr><td><ul><li><code class="module"><a href="./mod/mod_logio.html">mod_logio</a></code></li><li><code class="module"><a href="./mod/mod_log_config.html">mod_log_config</a></code></li><li><code class="module"><a href="./mod/mod_log_forensic.html">mod_log_forensic</a></code></li><li><code class="module"><a href="./mod/mod_cgi.html">mod_cgi</a></code></li></ul></td><td><ul><li><code class="directive"><a href="./mod/mod_log_config.html#logformat">LogFormat</a></code></li><li><code class="directive"><a href="./mod/mod_log_config.html#bufferedlogs">BufferedLogs</a></code></li><li><code class="directive"><a href="./mod/mod_log_forensic.html#forensiclog">ForensicLog</a></code></li><li><code class="directive"><a href="./mod/mpm_common.html#pidfile">PidFile</a></code></li><li><code class="directive"><a href="./mod/mod_cgi.html#scriptlog">ScriptLog</a></code></li><li><code class="directive"><a href="./mod/mod_cgi.html#scriptlogbuffer">ScriptLogBuffer</a></code></li><li><code class="directive"><a href="./mod/mod_cgi.html#scriptloglength">ScriptLogLength</a></code></li></ul></td></tr></table>
+
+ <h3>Logging actual bytes sent and received</h3>
+
+
+ <p><code class="module"><a href="./mod/mod_logio.html">mod_logio</a></code> adds in two additional
+ <code class="directive"><a href="./mod/mod_log_config.html#logformat">LogFormat</a></code> fields
+ (%I and %O) that log the actual number of bytes received and sent
+ on the network.</p>
+
+
+ <h3>Forensic Logging</h3>
+
+
+ <p><code class="module"><a href="./mod/mod_log_forensic.html">mod_log_forensic</a></code> provides for forensic logging of
+ client requests. Logging is done before and after processing a
+ request, so the forensic log contains two log lines for each
+ request. The forensic logger is very strict with no customizations.
+ It can be an invaluable debugging and security tool.</p>
+
+
+ <h3><a name="pidfile" id="pidfile">PID File</a></h3>
+
+
+ <p>On startup, Apache httpd saves the process id of the parent
+ httpd process to the file <code>logs/httpd.pid</code>. This
+ filename can be changed with the <code class="directive"><a href="./mod/mpm_common.html#pidfile">PidFile</a></code> directive. The
+ process-id is for use by the administrator in restarting and
+ terminating the daemon by sending signals to the parent
+ process; on Windows, use the -k command line option instead.
+ For more information see the <a href="stopping.html">Stopping
+ and Restarting</a> page.</p>
+
+
+ <h3><a name="scriptlog" id="scriptlog">Script Log</a></h3>
+
+
+ <p>In order to aid in debugging, the
+ <code class="directive"><a href="./mod/mod_cgi.html#scriptlog">ScriptLog</a></code> directive
+ allows you to record the input to and output from CGI scripts.
+ This should only be used in testing - not for live servers.
+ More information is available in the <a href="mod/mod_cgi.html">mod_cgi</a> documentation.</p>
+
+
+ </div></div>
+<div class="bottomlang">
+<p><span>Available Languages: </span><a href="./en/logs.html" title="English"> en </a> |
+<a href="./fr/logs.html" hreflang="fr" rel="alternate" title="Français"> fr </a> |
+<a href="./ja/logs.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
+<a href="./ko/logs.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> |
+<a href="./tr/logs.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </a></p>
+</div><div class="top"><a href="#page-header"><img src="./images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Freenode, or sent to our <a href="http://httpd.apache.org/lists.html">mailing lists</a>.</div>
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projects / apache / blobdiff