Facility Levels
A facility level is used to specify what type of program is logging the message. This lets the configuration file specify that messages from different facilities will be handled differently. The list of facilities available: (defined by RFC 3164)
| Facility Number | Keyword | Facility Description |
|---|---|---|
| 0 | kern | kernel messages |
| 1 | user | user-level messages |
| 2 | mail system | |
| 3 | daemon | system daemons |
| 4 | auth | security/authorization messages |
| 5 | syslog | messages generated internally by syslogd |
| 6 | lpr | line printer subsystem |
| 7 | news | network news subsystem |
| 8 | uucp | UUCP subsystem |
| 9 | clock daemon | |
| 10 | authpriv | security/authorization messages |
| 11 | ftp | FTP daemon |
| 12 | - | NTP subsystem |
| 13 | - | log audit |
| 14 | - | log alert |
| 15 | cron | clock daemon |
| 16 | local0 | local use 0 (local0) |
| 17 | local1 | local use 1 (local1) |
| 18 | local2 | local use 2 (local2) |
| 19 | local3 | local use 3 (local3) |
| 20 | local4 | local use 4 (local4) |
| 21 | local5 | local use 5 (local5) |
| 22 | local6 | local use 6 (local6) |
| 23 | local7 | local use 7 (local7) |
The mapping between Facility Number and Keyword is not uniform over different operating systems and different syslog implementations.
For cron either 9 or 15 or both may be used.
The confusion is even greater regarding auth/authpriv. 4 and 10 are most common but 13 and 14 may also be used.
Read more about this topic: Syslog
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