SYSLOG.CONF(5) OpenBSD Programmer's Manual SYSLOG.CONF(5)NAMEsyslog.conf - syslogd(8) configuration file
DESCRIPTION
The syslog.conf file is the configuration file for the syslogd(8)
program. It consists of blocks of lines separated by program
specifications, with each line containing two fields: the selector field
which specifies the types of messages and priorities to which the line
applies, and an action field which specifies the action to be taken if a
message syslogd receives matches the selection criteria. The selector
field is separated from the action field by one or more tab characters.
The selectors function is encoded as a facility, a period (`.'), and a
level, with no intervening whitespace. Both the facility and the level
are case insensitive.
The facility describes the part of the system generating the message, and
is one of the following keywords: auth, authpriv, cron, daemon, ftp,
kern, lpr, mail, mark, news, syslog, user, uucp and local0 through
local7. These keywords (with the exception of mark) correspond to the
similar ``LOG_'' values specified to the openlog(3) and syslog(3) library
routines.
The level describes the severity of the message, and is a keyword from
the following ordered list (highest to lowest): emerg, alert, crit, err,
warning, notice, info and debug. These keywords correspond to the
similar (LOG_) values specified to the syslog library routine.
Each block of lines is separated from the previous block by a tag. The
tag is a line beginning with !prog and each block will be associated with
calls to syslog from that specific program. When a message matches
multiple blocks, the action of each matching block is taken. If no tag
is specified at the beginning of the file, every line is checked for a
match and acted upon (at least until a tag is found).
!!prog causes the subsequent block to abort evaluation when a message
matches, ensuring that only a single set of actions is taken. !* can be
used to ensure that any ensuing blocks are further evaluated (i.e.
cancelling the effect of a !prog or !!prog).
See syslog(3) for further descriptions of both the facility and level
keywords and their significance. It's preferred that selections be made
on facility rather than program, since the latter can easily vary in a
networked environment. In some cases, though, an appropriate facility
simply doesn't exist.
If a received message matches the specified facility and is of the
specified level (or a higher level), and the first word in the message
after the date matches the program, the action specified in the action
field will be taken.
Multiple selectors may be specified for a single action by separating
them with semicolon (`;') characters. It is important to note, however,
that each selector can modify the ones preceding it.
Multiple facilities may be specified for a single level by separating
them with comma (`,') characters.
An asterisk (`*') can be used to specify all facilities, all levels or
all programs.
The special facility ``mark'' receives a message at priority ``info''
every 20 minutes (see syslogd(8)). This is not enabled by a facility
field containing an asterisk.
The special level ``none'' disables a particular facility.
The action field of each line specifies the action to be taken when the
selector field selects a message. There are six forms:
o A pathname (beginning with a leading slash). Selected messages are
appended to the file.
o A pipe to another program (beginning with a leading pipe symbol).
The given program is started and presented the selected messages on
its standard input. If the program exits, syslogd(8) tries to
restart it.
o A hostname (preceded by an at (`@') sign). Selected messages are
forwarded to the syslogd program on the named host. A port number
may be optionally specified using the host:port syntax.
o A comma separated list of users. Selected messages are written to
those users if they are logged in.
o An asterisk. Selected messages are written to all logged-in users.
o A colon, followed by a memory buffer size (in kilobytes), followed by
another colon, followed by a buffer name. Selected messages are
written to an in-memory buffer that may be read using syslogc(8).
Memory buffered logging is useful to provide access to log data on
devices that lack local storage (e.g. diskless workstations or
routers). The largest allowed buffer size is 256kb.
Blank lines and lines whose first non-blank character is a hash (`#')
character are ignored.
FILES
/etc/syslog.conf The syslogd(8) configuration file.
EXAMPLES
A configuration file might appear as follows:
# Log info (and higher) messages from spamd only to
# a dedicated file, discarding debug messages.
# Matching messages abort evaluation of further rules.
!!spamd
daemon.info /var/log/spamd
daemon.debug /dev/null
!*
# Log all kernel messages, authentication messages of
# level notice or higher and anything of level err or
# higher to the console.
# Don't log private authentication messages!
*.err;kern.*;auth.notice;authpriv.none /dev/console
# Log anything (except mail) of level info or higher.
# Don't log private authentication messages!
*.info;mail.none;authpriv.none /var/log/messages
# The authpriv file has restricted access.
authpriv.* /var/log/secure
# Log all the mail messages in one place.
mail.* /var/log/maillog
# Everybody gets emergency messages, plus log them on another
# machine.
*.emerg *
*.emerg @arpa.berkeley.edu
# Root and Eric get alert and higher messages.
*.alert root,eric
# Save mail and news errors of level err and higher in a
# special file.
mail,news.err /var/log/spoolerr
# Save ftpd transactions along with mail and news
!ftpd
*.* /var/log/spoolerr
# Keep a copy of all logging in a 32k memory buffer named "debug"
*.debug :32:debug
# Store notices and authpriv messages in a 64k buffer named "important"
*.notice,authpriv.* :64:important
# feed everything to logsurfer
*.* |/usr/local/sbin/logsurfer
SEE ALSOsyslog(3), syslogc(8), syslogd(8)HISTORY
The syslog.conf file appeared in 4.3BSD, along with syslogd(8).
BUGS
The effects of multiple selectors are sometimes not intuitive. For
example ``mail.crit;*.err'' will select ``mail'' facility messages at the
level of ``err'' or higher, not at the level of ``crit'' or higher.
OpenBSD 4.9 May 31, 2007 OpenBSD 4.9
