Rsyslog配置及使用教程

1.Rsyslog介绍
Rsyslog is Rocket-fast System for Log processing.Rsyslog是CentOS6系列默认的日志处理软件。Rsyslog基于模块化设计，提供高性能，安全的日志处理系统。Rsyslog是多线程的，支持TCP,UDP,TLS,RELP.Rsyslog实际上syslog的一个增强版本。

2.安装Rsyslog

CentOS下默认已经安装了rsyslog
查看rsyslog运行状态

$service rsyslog status
rsyslogd (pid  7542) is running...

$ ps -ef|grep rsyslog|grep -v grep
root      1014    1  0  2014 ?        00:15:09 /sbin/rsyslogd -i /var/run/syslogd.pid -c 5

这里-c 5 是在/etc/sysconfig/rsyslog中定义的
$ cat /etc/sysconfig/rsyslog 
# Options for rsyslogd
# Syslogd options are deprecated since rsyslog v3.
# If you want to use them, switch to compatibility mode 2 by "-c 2"
# See rsyslogd(8) for more details
SYSLOGD_OPTIONS="-c 5"

3.配置rsyslog

rsyslog的配置文件/etc/rsyslog.conf
# rsyslog v5 configuration file
 
# For more information see /usr/share/doc/rsyslog-*/rsyslog_conf.html
# If you experience problems, see
 
#### MODULES ####
 
$ModLoad imuxsock # provides support for local system logging (e.g. via logger command)
$ModLoad imklog  # provides kernel logging support (previously done by rklogd)
#$ModLoad immark  # provides --MARK-- message capability
 
# Provides UDP syslog reception
#$ModLoad imudp
#$UDPServerRun 514
 
# Provides TCP syslog reception
#$ModLoad imtcp
#$InputTCPServerRun 514
 
 
#### GLOBAL DIRECTIVES ####
 
# Use default timestamp format
$ActionFileDefaultTemplate RSYSLOG_TraditionalFileFormat
 
# File syncing capability is disabled by default. This feature is usually not required,
# not useful and an extreme performance hit
#$ActionFileEnableSync on
 
# Include all config files in /etc/rsyslog.d/
$IncludeConfig /etc/rsyslog.d/*.conf
 
 
#### RULES ####
 
# Log all kernel messages to the console.
# Logging much else clutters up the screen.
#kern.*                                                /dev/console
 
# Log anything (except mail) of level info or higher.
# Don't log private authentication messages!
*.info;mail.none;authpriv.none;cron.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
 
 
# Log cron stuff
cron.*                                                  /var/log/cron
 
# Everybody gets emergency messages
*.emerg                                                *
 
# Save news errors of level crit and higher in a special file.
uucp,news.crit                                          /var/log/spooler
 
# Save boot messages also to boot.log
local7.*                                                /var/log/boot.log
 
 
# ### begin forwarding rule ###
# The statement between the begin ... end define a SINGLE forwarding
# rule. They belong together, do NOT split them. If you create multiple
# forwarding rules, duplicate the whole block!
# Remote Logging (we use TCP for reliable delivery)
#
# An on-disk queue is created for this action. If the remote host is
# down, messages are spooled to disk and sent when it is up again.
#$WorkDirectory /var/lib/rsyslog # where to place spool files
#$ActionQueueFileName fwdRule1 # unique name prefix for spool files
#$ActionQueueMaxDiskSpace 1g  # 1gb space limit (use as much as possible)
#$ActionQueueSaveOnShutdown on # save messages to disk on shutdown
#$ActionQueueType LinkedList  # run asynchronously
#$ActionResumeRetryCount -1    # infinite retries if host is down
# remote host is: name/ip:port, e.g. 192.168.0.1:514, port optional
#*.* @@remote-host:514
# ### end of the forwarding rule ###