Another one of the system administrator's responsibilities is to manage the system logs. Debian systems by default log information that can tell an administrator how the system is being used, provide warnings and error messages that can indicate problems with software or hardware, and even provide early signs the system is being attacked or misused.
System logs are handled by the rsyslog package, and normally reside in /var/ log and its subdirectories. Various software packages and especially those that provide important services, such as DNS, FTP, E-Mail, and H1TP (Apache), often do extensive logging that may include entries that allow activity to be tracked and warn of potential problems or misconfiguration. The package documentation includes information on how to configure what is logged and where.
