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Full Discussion: UNIX - AIX - Syslog messages
Operating Systems AIX UNIX - AIX - Syslog messages Post 302948257 by bakunin on Saturday 27th of June 2015 05:42:01 PM
Old 06-27-2015
It might pay to understand how the syslog works:

On one side you have applications (this is rather losely defined, system tools might be among them), which use system calls to issue messages. Messages are grouped by "facilities" (local, user, audit, ....) and "severity" (info, warn, crit, ...). Each message belongs to exactly one facility and one severity.

Syslog is a daemon - syslogd - which collects all these messages. The syslog.conf file describes what syslogd should do with them: write them to a (certain) file, ignore them or send them to a remote destination. Notice, that the severity levels are ordered. Every rule for a certain level also affects all higher severities. Let us analyze your own example:

Code:
local0.crit /dev/console
local0.info /var/hacmp/adm/cluster.log

This means: all messages from the "local0" facility with severity "info" or higher ("info" the second-lowest severity, "debug" the lowest) go to the file /var/hacmp/adm/cluster.log. The messages from the "local0" facility with severity "crit" and higher also go the the system console and you will see them when you open the console from the HMC.

What exactly causes a certain message to be issued is a decision of the respective application: it issues a message and says this should go to facility "this" and with severity "that". Syslog then only collects this message and consults its rulebook syslog.conf about what to do with it.

I hope this helps.

bakunin

Last edited by bakunin; 06-27-2015 at 06:47 PM..
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Net::Server::Log::Sys::Syslog(3)			User Contributed Perl Documentation			  Net::Server::Log::Sys::Syslog(3)

NAME
Net::Server::Log::Sys::Syslog - log via Syslog SYNOPSIS
use base qw(Net::Server::PreFork); __PACKAGE__->run( log_file => 'Sys::Syslog', syslog_ident => 'myapp', ); DESCRIPTION
This module provides Sys::Syslog logging to the Net::Server system. CONFIGURATION
log_file To begin using Sys::Syslog logging, simply set the Net::Server log_file configuration parameter to "Sys::Syslog". If the magic name "Sys::Syslog" is used, all logging will take place via the Sys::Syslog module. If syslog is used the parameters "syslog_logsock", "syslog_ident", and "syslog_logopt",and "syslog_facility" may also be defined. syslog_logsock Only available if "log_file" is equal to "Sys::Syslog". May be either unix, inet, native, console, stream, udp, or tcp, or an arrayref of the types to try. Default is "unix" if the version of Sys::Syslog < 0.15 - otherwise the default is to not call setlogsock. See Sys::Syslog. syslog_ident Only available if "log_file" is equal to "Sys::Syslog". Id to prepend on syslog entries. Default is "net_server". See Sys::Syslog. syslog_logopt Only available if "log_file" is equal to "Sys::Syslog". May be either zero or more of "pid","cons","ndelay","nowait". Default is "pid". See Sys::Syslog. syslog_facility Only available if "log_file" is equal to "Sys::Syslog". See Sys::Syslog and syslog. Default is "daemon". DEFAULT ARGUMENTS FOR Net::Server The following arguments are available in the default "Net::Server" or "Net::Server::Single" modules. (Other personalities may use additional parameters and may optionally not use parameters from the base class.) Key Value Default ## syslog parameters (if log_file eq Sys::Syslog) syslog_logsock (native|unix|inet|udp |tcp|stream|console) unix (on Sys::Syslog < 0.15) syslog_ident "identity" "net_server" syslog_logopt (cons|ndelay|nowait|pid) pid syslog_facility w+ daemon METHODS
"initialize" This method is called during the initilize_logging method of Net::Server. It returns a single code ref that will be stored under the log_function property of the Net::Server object. That code ref takes log_level and message as arguments and calls the initialized log4perl system. "handle_log_error" This method is called if the log_function fails for some reason. It is passed the Net::Server object, the error that occurred while logging and an arrayref containing the log level and the message. In turn, this calls the legacy Net::Server::handle_syslog_error method. LICENCE
Distributed under the same terms as Net::Server POD ERRORS
Hey! The above document had some coding errors, which are explained below: Around line 104: You forgot a '=back' before '=head1' Around line 114: '=item' outside of any '=over' perl v5.16.2 2012-06-05 Net::Server::Log::Sys::Syslog(3)
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