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Apache HTTP Server Log
The Apache HTTP Server provides a detailed and flexible information-logging mechanism. The
two most important log files are the error and access logs. The default location for the Apache
HTTP Server log files is the following directory: /var/log/apache2
Using the Error Log to Diagnose the Apache HTTP Server
The Apache HTTP Server records diagnostic information and all errors encountered while
processing requests to the error log file, error_log.
For example, if you visit a nonexistent URL, the following 404 error is generated:
The requested URL /non-exist/ was not found on this server.
All error information is recorded in the default error log file, which you can obtain by entering
the following command:
# tail –f /var/log/apache2/error_log
The following message is added to the end of the file:
[Sat Feb 03 13:03:55 2007] [error] [client 10.100.0.86] File does not exist:
/srv/www/htdocs/non-exist
Using Webalizer to Perform Apache HTTP Server Log Analysis
Webalizer is an analysis tool that you can use to generate detailed usage reports using the
information recorded in the Apache HTTP Server logs. Webalizer provides easy-to-read reports
in HTML format that you can customize for your needs.
Use the following procedure to set up Webalizer:
1. Modify the Webalizer configuration file, /etc/webalizer.conf, by adding the following
lines:
LogFile /var/log/apache2/access_log
OutputDir /srv/www/htdocs/webalizer
2. Restart the Apache server by entering the following:
# /etc/init.d/apache2 restart
3. Run the Webalizer program to generate a report:
# webalizer
A message similar to the following appears:
Webalizer V2.01-10 (Linux 2.6.16.21-0.8-smp) English
Using logfile /var/log/apache2/access_log (clf)
DNS Lookup (10): 1 addresses in 1.00 seconds, 1/sec
Using DNS cache file dns_cache.db
Creating output in /srv/www/htdocs/webalizer
Hostname for reports is 'bl35p-16'
Reading history file... webalizer.hist
Generating report for February 2007
Generating summary report
Saving history information...
307 records in 1.00 seconds, 307/sec
Verify that the server status configuration is correct by opening a browser and entering the
following website:
http://<YOUR_WEB_SERVER_IP>/webalizer
Figure 8 shows an example of a Webalizer usage report web page.
Installing, Configuring, and Managing Web Server Middleware Stack Components 21