Write Drupal Logs to Rsyslog
Install rsyslog on your web server (should already be installed)
Enable the syslog module in Drupal
To allow Drupal to log to rsyslog, you have to enable the Drupal syslog module. Syslog is included with Drupal core.
Configure the Drupal module
In admin/config/development/logging , you can select one of the following prefixes for your website:
LOG_LOCAL0
LOG_LOCAL1
LOG_LOCAL2
LOG_LOCAL3
LOG_LOCAL4
LOG_LOCAL5
LOG_LOCAL6
LOG_LOCAL7
If you log one site, it really doesn’t matter which one you choose. If however you have multiple sites running on the same machine, and you want each site to log to a different file, the selection does matter. Eg: site A logs to LOG_LOCAL0, site B logs to LOG_LOCAL1, etc.
Configure rsyslog
vim /etc/rsyslog.d/50-default.conf
add the line:
local0.* /var/log/drupal.log
This will log all local0 logs to /var/log/drupal.log
If you have selected local1 in the previous step, you have to replace “local0” by “local1″ in the configuration line, etc. You can name your log file different from “drupal.log”, in fact you can choose any name that hasn’t been taken yet.
Restart rsyslog
service rsyslog restart
You should now cause an error (eg. 404) and see if /var/log/drupal.log has been created and gets filled. If you're having problems check if /var/log/messages gets filled with Drupal log messages. If it does recheck the previous steps and see if you made any mistakes.
Disable dblog
At this point, Drupal will log to both the log system and the regular dblog. You can simply disable the module “database logging” in admin/modules .
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