Enable SysLog with Drupal 7

1) Unistall Database Logging module
2) Install & configure the Syslog module
3) Configure rsyslog to Log to a Separate File

mkdir /var/log/cmlm
sudo vi /etc/rsyslog.d/drupal.conf

Add following to /etc/rsyslog.d/drupal.conf

# drupal loging

if ($programname == 'drupal') and ($syslogseverity <= '6') and ($msg contains 'localhost.drupal7') then /var/log/cmlm/drupal.log

4) Open /etc/rsyslog.conf and make sure the file is included
$IncludeConfig /etc/rsyslog.d/*.conf
local0.* /var/log/cmlm/drupal.log
(if local0 is the level that you configured Syslog to use in Step 1)
5) Restart rsyslog

sudo service rsyslog restart