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syslog has a debugging mechanism that allows the UNIX administrator to trace the emergence and flow of syslog messages.
Syslog is debugged in two parts:
On startup, syslog displays a two-dimensional matrix illustrating its configuration as defined in the configuration file /etc/syslog.conf.
In real time, syslog displays inbound syslog messages and specifies how the messages are processed.
Follow this procedure to turn on syslog debugging.
# /usr/sbin/syslogd -d
getnets() found 1 addresses, they are: 0.0.0.0.2.2
amiloghost() testing 127.0.0.1.2.2
I am loghost
amiloghost() testing 127.0.0.1.2.2
The next section is syslogd reading from syslog.conf.
cfline(*.err;kern.notice;auth.notice /dev/console) cfline(*.err;kern.debug;daemon.notice;mail.crit /var/adm/messages) cfline(*.alert;kern.err;daemon.err operator) cfline(*.alert root) cfline(*.emerg *) cfline(mail.debug /var/log/syslog)
Here, syslogd prints version information.
syslogd: version 1.59 Started: Fri May 15 21:07:26 1998 Input message count: system 0, network 0
This section is a matrix of inputs and outputs. The value in each position represents the minimum severity level (7 = debug, 6 = info, 5 = notice, 4 = warning, 3 = err, 2 = crit, 1 = alert, 0 = emerg, x = nothing). Each column is a different service (left to right: kern, user, mail, daemon, auth, lpr, news, uucp, cron, local0-local7, mark). Each row represents a different output (a file or user).
# Outputs: 6 5 3 3 3 5 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 X CONSOLE: /dev/console 7 3 2 5 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 X FILE: /var/adm/messages 3 1 1 3 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 X USERS: operator 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 X USERS: root 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 X WALL: X X 7 X X X X X X X X X X X X X X X X X X X X X X FILE: /var/log/syslog Per File Statistics File Tot Dups Nofwd Errs ---- --- ---- ----- ---- /dev/console 0 0 0 0 /var/adm/messages 0 0 0 0 operator 0 0 0 0 root 0 0 0 0 WALL 0 0 0 0 /var/log/syslog 0 0 0 0 syslogd: restarted off & running.... Logging to FILE /var/adm/messages Logging to FILE /var/adm/messages
logger -p auth.notice "This is a test."
and then syslogd in debug mode will display
Logging to CONSOLE /dev/console
and the following text will appear on the console window.
May 15 16:21:31 alpha pete: This is a test.
Example 2: the following command is run
logger -p mail.crit "This is the next test."
and then syslogd in debug mode will display
Logging to FILE /var/adm/messages
and the following entry will be written to /var/adm/messages.
May 15 16:21:49 alpha pete: This is the next test.
^Csyslogd: going down on signal 2 syslogd: going down on signal 2 #
Note: syslogd should be run in debug mode only interactively. The system will hang if syslogd is run in debug mode in the system startup scripts (usually /etc/rc2.d/ S74syslog ).
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