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Changing the Web Server Log Format
By default your Virtual Server web server logs in the Combined Log Format. All access, agent, and referer information is logged to the ~/www/logs/access_log file.

You can change the web server log format to the Common Log Format by modifying your web server configuration file (~/www/conf/httpd.conf) like this:

# common log format
LogFormat "%h %l %u %t \"%r\" %s %b"
 
# combined log format
#LogFormat "%h %l %u %t \"%r\" %s %b \"%{Referer}i\" \"%{User-Agent}i\""

# The location of the access logfile
# If this does not start with /, ServerRoot is prepended to it.

TransferLog logs/access_log

# If you would like to have a separate agent and referer logfile
# uncomment the following directives.

RefererLog logs/referer_log
AgentLog logs/agent_log

After making the changes above, the web server will log access, agent, and referer information to separate logfiles, in the Common Log Format.

You can also define your own log format by modifying the LogFormat directive above. See Module mod_log_config at the Apache Web site for more details.