>>http://httpd.apache.org/docs/1.3/logs.html
http://httpd.apache.org/docs/2.0/logs.html
http://httpd.apache.org/docs/2.2/logs.html
http://httpd.apache.org/docs/2.2/mod/mod_log_config.html
http://linux.die.net/man/3/strftime
>>===mod_log===
apache httpd mod_log logs http access and errors
==log format==
you can customise the log format
%%
LogFormat "%h %l %u %t \"%r\" %>s %b" common
%%
==conditional log==
you can conditionally omit certain entries
%%
 # Mark requests for the robots.txt file
SetEnvIf Request_URI "^/robots\.txt$" dontlog
# Log what remains
CustomLog logs/access_log common env=!dontlog
%%
==log rotate==
normal logrotate does not work since apache locks the files open 

but you can manually truncate
%%
$ > /var/log/access_log
%%

or shorten them 
%%
$ tail -10000 /var/log/access_log > /var/log/access_log
%%

without restarting apache httpd otherwise you must use

==piped log==
rotatelogs is an apache utility you can pipe logs to and rotate them 
(in seconds)
hourly (12 logs/day)
%%
CustomLog "|/usr/local/apache/bin/rotatelogs /var/log/access_log.%I 3600" common
%%

hourly (24 logs/day)
%%
CustomLog "|/usr/local/apache/bin/rotatelogs /var/log/access_log.%H 3600" common
%%

daily (7 logs/week)
%%
CustomLog "|/usr/local/apache/bin/rotatelogs /var/log/access_log.%w 86400" common
%%

LogFormat

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REFERRERS
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