1.有以下命令可以查看CentOS 版本：
[root@logsys0 data]# lsb_release -a
LSB Version: :core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarch
Distributor ID: CentOS
Description: CentOS release 6.3 (Final)
Release: 6.3
Codename: Final
2.下載安裝EPEL源
Centos 5.x
[root@logsys0 data]# wget http://dl.fedoraproject.org/pub/epel/5/x86_64/epel-release-5-4.noarch.rpm
Centos 6.x
[root@logsys0 data]# wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
[root@logsys0 data]# rpm -ivh epel-release-6-8.noarch.rpm3. 安裝syslog-ng
[root@logsys0 data]# yum --enablerepo=epel install syslog-ng eventlog syslog-ng-libdbi
設置變更：vim /etc/syslog-ng/syslog-ng.conf[root@logsys0 data]# chkconfig rsyslog off; chkconfig syslog-ng on
[root@logsys0 data]# service rsyslog stop;service syslog-ng start
關閉系統日志記錄器： [確定]
啟動 syslog-ng： [確定]
#重新加載配置：service syslog-ng reload
安裝成功
4. 開啟防火牆80和514端口
vi /etc/sysconfig/iptables
添加兩條規則
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m udp -p udp --dport 514 -j ACCEPT
配置文件如下：
# Firewall configuration written by system-config-firewall
# Manual customization of this file is not recommended.
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:RH-Firewall-1-INPUT - [0:0]
-A INPUT -j RH-Firewall-1-INPUT
-A FORWARD -j RH-Firewall-1-INPUT
-A RH-Firewall-1-INPUT -i lo -j ACCEPT
-A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m udp -p udp --dport 514 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
[root@ www.linuxidc.com data]# /etc/init.d/iptables restart
iptables：清除防火牆規則： [確定]
iptables：將鏈設置為政策 ACCEPT：filter [確定]
iptables：正在卸載模塊： [確定]
iptables：應用防火牆規則： [確定]
Syslog-ng 的詳細介紹：請點這裡
Syslog-ng 的下載地址：請點這裡
