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Syslog Facility Levels

The RFC 5424 defines eight severity levels:

Code Severity Keyword Description General Description
0 Emergency emerg (panic) System is unusable. A “panic” condition usually affecting multiple apps/servers/sites. At this level it would usually notify all tech staff on call.
1 Alert alert Action must be taken immediately. Should be corrected immediately, therefore notify staff who can fix the problem. An example would be the loss of a primary ISP connection.
2 Critical crit Critical conditions. Should be corrected immediately, but indicates failure in a secondary system, an example is a loss of a backup ISP connection.
3 Error err (error) Error conditions. Non-urgent failures, these should be relayed to developers or admins; each item must be resolved within a given time.
4 Warning warning (warn) Warning conditions. Warning messages, not an error, but indication that an error will occur if action is not taken, e.g. file system 85% full - each item must be resolved within a given time.
5 Notice notice Normal but significant condition. Events that are unusual but not error conditions - might be summarized in an email to developers or admins to spot potential problems - no immediate action required.
6 Informational info Informational messages. Normal operational messages - may be harvested for reporting, measuring throughput, etc. - no action required.
7 Debug debug Debug-level messages. Info useful to developers for debugging the application, not useful during operations.

SLES 10 syslog ng


To enable syslogging to a different log host edit this file:

OES:~ # vi /etc/syslog-ng/

An add these lines to the bottom of the file:

destination loghost_udp {
        udp("" port(514));
log {

Afterwards run these commands to activate the logging:

OES:~ # SuSEconfig --module syslog-ng
Starting SuSEconfig, the SuSE Configuration Tool...
Running module syslog-ng only
Reading /etc/sysconfig and updating the system...
Executing /sbin/conf.d/SuSEconfig.syslog-ng...
Checking //etc/syslog-ng/syslog-ng.conf.SuSEconfig file: ok

OES:~ # /etc/init.d/syslog restart
Shutting down syslog services                                         done
Starting syslog services                                              done


Do you also get a lot of these messages?:

Syslog 	Syslog 	Notice 	OES syslog-ng[2435]: STATS: dropped 0  	14:19:30 May 19 2009
Syslog 	Syslog 	Notice 	OES syslog-ng[2435]: STATS: dropped 0 	13:19:29 May 19 2009
Syslog 	Syslog 	Notice 	OES syslog-ng[2435]: STATS: dropped 0 	12:19:29 May 19 2009
Syslog 	Syslog 	Notice 	OES syslog-ng[2435]: STATS: dropped 0 	11:19:29 May 19 2009

They mean that syslog hasn't dropped any message! Well, ain't that cool! But, I don't wanna know each hour. Once a day is good enough:

OES:~ # vi /etc/syslog-ng/

And edit this line:

options { long_hostnames(off); sync(0); perm(0640); stats(86400); };

I changes the stats to 86.400 which means once a day. It was 3600, which means once every hour.

Test message

To test syslogging you can use the logger command:

logger "Testmessage oesbox"


In SLES 11, the SuSEconfig script and its configuration template aren't used any more. You can enter the changes above directly in the /etc/syslog-ng/syslog-ng.conf file.

AIX syslog

To enable syslogging on an AIX box and to forward all information to a particular syslog server edit the /etc/syslog.conf file and restart the syslog daemon:

vi /etc/syslog.conf:

In this file you configure the logging in this format:

facility.priority destination
<facility> is:
       * - all (except mark)
       mark - time marks
       kern,user,mail,daemon, auth,... (see syslogd(AIX Commands Reference))

<priority> is one of (from high to low):
       (meaning all messages of this priority or higher)

<destination> is:
       /filename - log to this file
       username[,username2...] - write to user(s)
       @hostname - send to syslogd on this machine
       * - send to all logged in users

Example:               /var/adm/log.log   rotate size 10m files 2 compress
#user.debug              /var/adm/log.dbg   rotate size 20m files 8 compress

Because I want to send all messages to a syslogd server, this is the line I need:

bash-3.2# refresh -s syslogd
0513-095 The request for subsystem refresh was completed successfully.

Solaris Syslog

The theory and file buildup is the same for Solaris and AIX. There is a difference though, to restart the syslog service you'll have to issue this command:

sudo svcadm restart system-log
Note: Do not use spaces (not even one!) between the selector and action colums. always use tabs or syslog will not read the configuration file correctly, resulting in errors like this:
syslogd: line xx: unknown priority name "debug                                      @loghost"
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syslog.txt · Last modified: 2021/09/23 22:25 (external edit)