Three
directive definitions, when together, define what is known
as the "Separate Log Format" or "Common
Log Format" for storing resource request information.
The Common Log Format stores the following requested resource
information in separate log files:
- Referrer information
- Browser information
- Agent information
Note: The default
format is the combined log format, which we recommend
for web server efficiency and log file analysis effectively.
Switching from Common
Log Format to Combined Log Format
- From your httpd.conf
file, "comment out" the AgentLog
and ReferrerLog directives by placing a pound
sign "#" in front of the two directive
lines, or
- Remove the two directive
lines (not recommended).
- Include a special
LogFormat directive definition line in front
of your current TransferLog directive line.
See the example below:
ErrorLog logs/error_log
LogFormat "%h %l %u %t \"%r\" %>s
%b \"%{Referrer}i\" \"%{User-Agent}i\""
TransferLog logs/access_log
# AgentLog logs/agent_log
# ReferrerLog logs/referrer_log
Note: There may
be a LogFormat directive like the one above located
in your server configuration file. If the line is commented
out, then uncomment the line by removing the leading
pound sign ("#").
After you have made the
modifications, take a look at your transfer log file
with the tail command. Each entry in your transfer
log file should now look something like this:
some.remote.host -
- [19/Aug/1998:13:48:56 –0600]
"GET /index.php HTTP/1.0" 200 4817
"http://another.remote.host/path/info/document.html"
"Mozilla/3.01 (X11; I; BSD/OS 2.0 i386)"
Turning Off Specific
Log Files
- Comment the line
out by using by preceding the line with a "#"
sign, or
- Specify the special
file /dev/null as the target for the Log directives.
For example:
ErrorLog /dev/null
TransferLog /dev/null
AgentLog /dev/null
ReferrerLog /dev/null
Note: If you are
going to turn off specific log files, we recommend doing
so by using the first method described above, since
the second method still requires Apache to create the
log files, which are then immediately deleted.
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