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Subject cvs commit: httpd-2.0/docs/manual/mod mod_log_config.xml
Date Sat, 02 Mar 2002 03:32:22 GMT
rbowen      02/03/01 19:32:22

  Added:       docs/manual/mod mod_log_config.xml
  Conversion to XML
  Revision  Changes    Path
  1.1                  httpd-2.0/docs/manual/mod/mod_log_config.xml
  Index: mod_log_config.xml
  <?xml version="1.0"?>
  <?xml-stylesheet type="text/xsl" href="../style/manual.xsl"?>
  <description>This module provides for logging of the requests 
  made to the server, using the Common Log Format or a 
  user-specified format.</description>
      <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.
      Conditional logging is provided so that individual requests may
      be included or excluded from the logs based on characteristics
      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>
  <seealso><strong>See also</strong>: 
  <a href="../logs.html">Apache Log Files</a>.</seealso>
  <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
      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.
      Literal quotes and back-slashes should be escaped with
      <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>
  <td>Remote IP-address</td></tr>
  <td>Local IP-address</td></tr>
  <td>Bytes sent, excluding HTTP headers.</td></tr>
  <td>Bytes sent, excluding HTTP headers. In CLF format
  i.e. a '-' rather than a 0 when no bytes are sent.</td></tr>
  <td>The contents of cookie "Foobar" in the request sent to the server.</td></tr>
  <td>The time taken to serve the request, in microseconds.</td></tr>
  <td>The contents of the environment variable FOOBAR</td></tr>
  <td>Remote host</td></tr>
  <td>The request protocol</td></tr>
  <td>The contents of Foobar: header line(s) in the request
  sent to the server.</td></tr>
  <td>Remote logname (from identd, if supplied)</td></tr>
  <td>The request method</td></tr>
  <td>The contents of note "Foobar" from another module.</td></tr>
  <td>The contents of Foobar: header line(s) in the reply.</td></tr>
  <td>The canonical Port of the server serving the request</td></tr>
  <td>The process ID of the child that serviced the request.</td></tr>
  <td>The query string (prepended with a ? if a query string exists,
  otherwise an empty string)</td></tr>
  <td>First line of request</td></tr>
  <td>Status.  For requests that got internally redirected, this is
  the status of the *original* request --- %...&gt;s for the last.</td></tr>
  <td>Time, in common log format time format (standard english format)</td></tr>
  <td>The time, in the form given by format, which should
  be in strftime(3) format. (potentially localized)</td></tr>
  <td>The time taken to serve the request, in seconds.</td></tr>
  <td>Remote user (from auth; may be bogus if return status (%s) is 401)</td></tr>
  <td>The URL path requested, not including any query string.</td></tr>
  <td>The canonical ServerName of the server serving the request.</td></tr>
  <td>The server name according to the UseCanonicalName setting.</td></tr>
  <td>Connection status when response is completed.
  '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.
  (This directive was %...c in late versions of Apache 1.3, but
  this conflicted with the historical ssl %...{var}c syntax.)</td></tr>
      <p>The "..." can be nothing at all (<em>e.g.</em>, <code>"%h
      %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>
      <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>
      <p>Some commonly used log format strings are:</p>
        <dt>Common Log Format (CLF)</dt>
        <dd><code>"%h %l %u %t \"%r\" %&gt;s %b"</code></dd>
        <dt>Common Log Format with Virtual Host</dt>
        <dd><code>"%v %h %l %u %t \"%r\" %&gt;s %b"</code></dd>
        <dt>NCSA extended/combined log format</dt>
        <dd><code>"%h %l %u %t \"%r\" %&gt;s %b \"%{Referer}i\"
        <dt>Referer log format</dt>
        <dd><code>"%{Referer}i -&gt; %U"</code></dd>
        <dt>Agent (Browser) log format</dt>
      <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
      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
      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>
      <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>
  <description>Sets filename for the logging of cookies</description>
  <syntax>CookieLog <em>filename</em></syntax>
  <contextlist><context>server config</context><context>virtual
  <compatibility>Only available in Apache 1.2 and above</compatibility>
      <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
      included only for compatibility with <module>mod_cookies</module>,
      and is deprecated.</p>
  <description>Sets filename and format of log file</description>
      <em>file</em>|<em>pipe</em> <em>format</em>|<em>nickname</em>
  <contextlist><context>server config</context><context>virtual
  <compatibility>Nickname only available in Apache 1.3 or later.
  Conditional logging available in 1.3.5 or later.</compatibility>
      <p>The <directive>CustomLog</directive> directive is used to
      log requests to the server. A log format is specified, and the
      logging can optionally be made conditional on request
      characteristics using environment variables.</p>
      <p>The first argument, which specifies the location to which
      the logs will be written, can take on one of the following two
      types of values:</p>
        <dd>A filename, relative to the <a
        <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>
      <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>
      <p>For example, the following two sets of directives have
      exactly the same effect:</p>
       # CustomLog with format nickname<br />
       LogFormat "%h %l %u %t \"%r\" %&gt;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\" %&gt;s %b"<br />
      <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
      request will be logged.</p>
      <p>Environment variables can be set on a <em>per</em>-request
      basis using the <module>mod_setenvif</module>
      and/or <module>mod_rewrite</module> modules. For
      example, if you don't want to record requests for all GIF
      images on your server in a separate logfile but not your main
      log, you can use:</p>
      SetEnvIf Request_URI \.gif$ gif-image<br />
      CustomLog gif-requests.log common env=gif-image<br />
      CustomLog nongif-requests.log common env=!gif-image
  <description>Describes a format for use in a log file</description>
      <em>format</em>|<em>nickname</em> [<em>nickname</em>]</syntax>
  <contextlist><context>server config</context><context>virtual
  <compatibility>Nickname only available in Apache 1.3 or later.
      <p>This directive specifies the format of the access log
      <p>The <directive>LogFormat</directive> directive can take one of
      forms. In the first form, where only one argument is specified,
      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
      formats</a> section above. Alternatively, it can use a
      <em>nickname</em> to refer to a log format defined in a
      previous <directive>LogFormat</directive> directive as described
      <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
      subsequent <directive>LogFormat</directive> or
      <directive>CustomLog</directive> directives rather than
      repeating the entire format string. A
      directive which 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.</p>
  <description>Specifly location of a log file</description>
  <syntax>TransferLog <em>file</em>|<em>pipe</em></syntax>
  <contextlist><context>server config</context><context>virtual
      <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
      specified <directive>LogFormat</directive> directive (which
      does not define a nickname). Common Log Format is used if no
      other format has been specified.</p>
     LogFormat "%h %l %u %t \"%r\" %&gt;s %b \"%{Referer}i\" \"%{User-agent}i\""<br
     TransferLog logs/access_log

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