Log File Types
The Webalizer analyzes web server log files, extracting such items as client's IP addresses, URL paths, processing times, user agents, referrers, etc. and grouping them in order to produce HTML reports.
Web servers log HTTP traffic using different file formats. Most popular file formats are CLF, the Apache Custom Log Format and W3C Extended Log File Format. An example of a CLF log line is shown below.
192.168.1.20 - - "GET HTTP/ 1.1" 200 1774Apache Custom Log Format can be customized to log most HTTP parameters, including request processing time and the size of the request itself. The format of a custom log is controlled by the format line. A typical Apache log format configuration is shown below.
LogFormat "%a %l \"%u\" %t %m \"%U\" \"%q\" %p %>s %b %D \"%{Referer}i\" \"%{User-Agent}i\"" my_custom_log CustomLog logs/access_log my_custom_logMicrosoft's Internet Information Services (IIS) web server logs HTTP traffic in W3C Extended Log File Format. Similarly to Apache Custom Log format, IIS logs may be configured to capture such extended parameters as request processing time. W3C extended logs may be recognized by the presence of one or more format lines, such as the one shown below.
#Fields: date time s-ip cs-method cs-uri-stem cs-uri-query s-port cs-username c-ip cs(User-Agent) cs(Referer) sc-status sc-bytes cs-bytes time-takenThe original version of The Webalizer can process CLF log files, as well as HTTP proxy log files produced by Squid servers. Other log file formats are usually converted to CLF in order to be analyzed. Some of the forks listed in the External Links section below are capable of processing IIS and Apache log files without having to convert them to CLF first.
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