Soubor /etc/syslog.conf říká systémovému log daemonu syslogd, kam má které systémové zprávy zapsat.
Direktiva v konfiguračním souboru obsahuje dvě pole oddělené tabulátorem:
facility.level [; facility.level] akce
Kde facility může nabývat hodnot:
user – Messages generated by user processes. This is the default priority for messages from programs or facilities not listed in this file.
kern – Messages generated by the kernel.
mail – The mail system.
daemon – System daemons, such as in.ftpd
auth – The authorization system: login, su, getty, among others.
lpr – The line printer spooling system: lpr, lpc, among others.
news – Reserved for the USENET network news system.
uucp – Reserved for the UUCP system; it does not currently use the syslog mechanism.
cron – The cron/at facility; crontab, at, cron, among others.
local0-7 – Reserved for local use.
mark – For timestamp messages produced internally by syslogd.
* – An asterisk indicates all facilities except for the mark facility.
A level (v pořadí s klesající důležitostí):
emerg – For panic conditions that would normally be broadcast to all users.
alert – For conditions that should be corrected immediately, such as a corrupted system database.
crit – For warnings about critical conditions, such as hard device errors.
err – For other errors.
warning – For warning messages.
notice – For conditions that are not error conditions, but may require special handling. A configuration entry with a level value of notice must appear on a separate line.
info – Informational messages.
debug – For messages that are normally used only when debugging a program.
none – Do not send messages from the indicated facility to the selected file. For example, a selector of
*.debug;mail.none
will send all messages except mail messages to the
selected file.
A nakonec hodnoty akce (kam se má zpráva nasměrovat):
filename (s počátečním lomítkem /) – Zápis do souboru (otevřen v append modu).
host (s prefixem @) – Přesměrováno do syslogu na jinou stanici.
username[,username] – Zpráva se vypíše na konzoli uživateli, pokud je zalogován.
* – Zpráva bude odeslána všem zalogovaným uživatelům.