The standard logging protocol on Unix and related systems is called Syslog. Most modern Linux distributions use an implementation such as Rsyslog or Syslog-NG. They all perform the same tasks:
Most system utilities send log messages to Syslog, but other server software (such as Apache, MySQL, or PostgreSQL), by default, save messages directly to files on disk.
Webmin allows you to control Syslog and decide which messages get saved to which files. In order to understand how Syslog separates messages, we need to explain two concepts: facilities and priorities.
Each message sent ...