RHEL5 下使用syslog-ng构建集中型日志服务器

RHEL5 [/b]下使用syslog-ng构建集中型日志服务器[/b]

在生产环境中，存在一台日志服务器，专门用来记录其他服务器的日志信息是个很好的主意，不过用红帽自带的syslog，配置虽然简单，但是日志却没有办法分离，默认都堆在/var/log/message文件里面，用来超不爽，下面来介绍下用syslog-ng来构建日志服务器，这个还支持将日志导入数据库和通过网页来发布日志，听起来功能相当的强大，接下来要好好的研究下咯……

环境介绍

日志服务器IP：192.168.90.20；客户端IP：192.168.90.10

系统：RHEL5.4

实现目标：将客户端的日志自动保存在服务器端的相应目录，并根据日期，IP地址和日志类型进行分开保存

备注：由于在虚拟机环境下操作，服务器于客户端时间未同步，所以会存在记录日志时间不一致的现象；

[root@server2 ~]# cd /usr/local/src/tarbag/

[root@server2 tarbag]# wget http://www.balabit.com/downloads/files/eventlog/0.2/eventlog_0.2.9.tar.gz
[root@server2 tarbag]# tar -zxvf eventlog_0.2.9.tar.gz -C ../software/

[root@server2 tarbag]# cd ../software/eventlog-0.2.9/

[root@server2 eventlog-0.2.9]# ./configure --prefix=/usr/local/eventlog && make && make install

[root@server2 eventlog-0.2.9]# ls /usr/local/eventlog/

include lib

[root@server2 syslog-ng-3.0.5]# cd -

/usr/local/src/tarbag

[root@server2 tarbag]# wget http://www.balabit.com/downloads/files/libol/0.3/libol-0.3.9.tar.gz
[root@server2 tarbag]# tar -zxvf libol-0.3.9.tar.gz -C ../software/

[root@server2 tarbag]# cd ../software/libol-0.3.9/

[root@server2 libol-0.3.9]# ./configure --prefix=/usr/local/libol && make && make install

[root@server2 libol-0.3.9]# ls /usr/local/libol/

bin include lib

[root@server2 tarbag]# wget http://www.balabit.com/downloads/files/syslog-ng/sources/3.0.5/source/syslog-ng_3.0.5.tar.gz
[root@server2 tarbag]# tar -zxvf syslog-ng_3.0.5.tar.gz -C ../software/

[root@server2 tarbag]# cd ../software/syslog-ng-3.0.5/

[root@server2 syslog-ng-3.0.5]# export PKG_CONFIG_PATH=/usr/local/eventlog/lib/pkgconfig

[root@server2 syslog-ng-3.0.5]# ./configure --prefix=/usr/local/syslog-ng --with-libol=/usr/local/libol && make && make install

configure: error: Cannot find eventlog version >= 0.2: is pkg-config in path? (若出现这个错误，基本上是由于前面的PKG_CONFIG_PATH变量没指定好)

[root@server2 syslog-ng-3.0.5]# ls /usr/local/syslog-ng/

bin libexec sbin share

[root@server2 syslog-ng-3.0.5]# mkdir /usr/local/syslog-ng/etc

[root@server2 syslog-ng-3.0.5]# mkdir /usr/local/syslog-ng/var

[root@server2 syslog-ng-3.0.5]# cp contrib/syslog-ng.conf.RedHat /usr/local/syslog-ng/etc/

[root@server2 syslog-ng-3.0.5]# cp contrib/init.d.RedHat /etc/init.d/syslog-ng

[root@server2 syslog-ng-3.0.5]# cd /usr/local/syslog-ng/etc/

[root@server2 etc]# mv syslog-ng.conf.RedHat syslog-ng.conf

[root@server2 etc]# cat syslog-ng.conf

[/b]@version:3.0

options {

long_hostnames(off);

log_msg_size(8192);

flush_lines(1);

log_fifo_size(20480);

time_reopen(10);

use_dns(yes);

dns_cache(yes);

use_fqdn(yes);

keep_hostname(yes);

chain_hostnames(no);

perm(0644);

stats_freq(43200);

};

source s_internal { internal(); };

destination d_syslognglog { file("/var/log/syslog-ng.log"); };

log { source(s_internal); destination(d_syslognglog); };

source s_local {

unix-dgram("/dev/log");

file("/proc/kmsg" program_override("kernel:"));

};

filter f_messages { level(info..emerg); }; //定义7种日志类型

filter f_secure { facility(authpriv); };

filter f_mail { facility(mail); };

filter f_cron { facility(cron); };

filter f_emerg { level(emerg); };

filter f_spooler { level(crit..emerg) and facility(uucp, news); };

filter f_local7 { facility(local7); };

destination d_messages { file("/var/log/messages"); }; //定义7种类型日志在客户端的位置

destination d_secure { file("/var/log/secure"); };

destination d_maillog { file("/var/log/maillog"); };

destination d_cron { file("/var/log/cron"); };

destination d_console { usertty("root"); };

destination d_spooler { file("/var/log/spooler"); };

destination d_bootlog { file("/var/log/dmesg"); };

log { source(s_local); filter(f_emerg); destination(d_console); };

log { source(s_local); filter(f_secure); destination(d_secure); flags(final); };

log { source(s_local); filter(f_mail); destination(d_maillog); flags(final); };

log { source(s_local); filter(f_cron); destination(d_cron); flags(final); };

log { source(s_local); filter(f_spooler); destination(d_spooler); };

log { source(s_local); filter(f_local7); destination(d_bootlog); };

log { source(s_local); filter(f_messages); destination(d_messages); };

# Remote logging //定义监听的端口

source s_remote {

tcp(ip(0.0.0.0) port(514));

udp(ip(0.0.0.0) port(514));

};

//定义客户端日志在服务器上保存的格式，位置和权限等

destination r_console {file("/var/log/syslog-ng/$YEAR$MONTH$DAY/$HOST/console" owner("root") group("root") perm(0640) dir_perm(0750) create_dirs(yes));};

destination r_secure {file("/var/log/syslog-ng/$YEAR$MONTH$DAY/$HOST/secure" owner("root") group("root") perm(0640) dir_perm(0750) create_dirs(yes));};

destination r_cron {file("/var/log/syslog-ng/$YEAR$MONTH$DAY/$HOST/cron" owner("root") group("root") perm(0640) dir_perm(0750) create_dirs(yes));};

destination r_spooler {file("/var/log/syslog-ng/$YEAR$MONTH$DAY/$HOST/spooler" owner("root") group("root") perm(0640) dir_perm(0750) create_dirs(yes));};

destination r_bootlog {file("/var/log/syslog-ng/$YEAR$MONTH$DAY/$HOST/bootlog" owner("root") group("root") perm(0640) dir_perm(0750) create_dirs(yes));};

destination r_messages {file("/var/log/syslog-ng/$YEAR$MONTH$DAY/$HOST/messages" owner("root") group("root") perm(0640) dir_perm(0750) create_dirs(yes));};

log { source(s_remote); filter(f_emerg); destination(r_console); };

log { source(s_remote); filter(f_secure); destination(r_secure); flags(final); };

log { source(s_remote); filter(f_cron); destination(r_cron); flags(final); };

log { source(s_remote); filter(f_spooler); destination(r_spooler); };

log { source(s_remote); filter(f_local7); destination(r_bootlog); };

log { source(s_remote); filter(f_messages); destination(r_messages); };

[root@server2 etc]# chmod +x /etc/init.d/syslog-ng

[root@server2 etc]# chkconfig --add syslog-ng

service syslog-ng does not support chkconfig(若出现该错误，请修改该脚本前四行如下)

[root@server2 etc]# head -4 /etc/init.d/syslog-ng //[/b]加services不是在usr下的etc[/b]

#!/bin/bash

#chkconifg: --add syslog-ng

#chkconfig: 2345 12 88

#Description: syslog-ng

该脚本还需要修改下面的三个位置

[root@server2 etc]# grep ‘PATH‘ /etc/init.d/syslog-ng

PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/syslog-ng/bin:/usr/local/syslog-ng/sbin

[root@server2 etc]# grep 'INIT' /etc/init.d/syslog-ng |head -2

INIT_PROG="/usr/local/syslog-ng/sbin/syslog-ng" # Full path to daemon

INIT_OPTS="-f /usr/local/syslog-ng/etc/syslog-ng.conf" # options passed to daemon

[root@server2 etc]# service syslog-ng start // [/b]注意cd /usr/local/syslog-ng/etc/

[/b]Starting syslog-ng: /usr/local/syslog-ng/sbin/syslog-ng: error while loading shared libraries: libevtlog.so.0: cannot open shared object file: No such file or directory

Starting Kernel Logger: 出现此错误是因为共享库链接没做好

[root@server2 etc]# ln -s /usr/local/eventlog/lib/* /lib/

出现下面的问题是因为主配置文件中缺少：@version:3.0这行

Starting syslog-ng: Configuration file has no version number, assuming syslog-ng 2.1 format. Please add @version: maj.min to the beginning of the file;

[root@server2 ~]# service syslog-ng start

Starting Kernel Logger: [ OK ]

[root@server2 etc]# cat /var/log/syslog-ng.log

Jan 28 03:59:07 server2.yang.com syslog-ng[20225]: syslog-ng starting up; version='3.0.5'

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客户端配置：

[/b][root@client ~]# tail -1 /etc/syslog.conf

*.* @192.168.90.20

[root@client ~]# logger -i just one test

[root@client ~]# tail -1 /var/log/messages

Jan 27 22:12:02 client root[2861]: just one test

[root@server2 ~]# cat /var/log/syslog-ng/20100128/192.168.90.10/messages

Jan 28 04:24:32 192.168.90.10 root[2861]: just one test

[root@server2 ~]# cat /var/log/syslog-ng/20100128/192.168.90.10/secure

Jan 28 04:01:04 192.168.90.10 sshd[2832]: Accepted publickey for root from 192.168.90.1 port 48834 ssh2

Jan 28 04:01:04 192.168.90.10 sshd[2832]: pam_unix(sshd:session): session opened for user root by (uid=0)

参考网站：http://blog.sina.com.cn/s/blog_4a071ed80100cssu.html

前面配置好了syslog-ng,下面简要的概述下如何将系统日志存入mysql

[/b]1：将mysql的头文件和库文件链接到/usr/local下

[root@server2 ~]# ln -s /usr/local/mysql/lib/mysql /usr/local/lib/mysql

[root@server2 ~]# ln -s /usr/local/mysql/include/mysql/ /usr/local/include

[root@server2 ~]# cd /usr/local/src/software/sqlsyslogd

2：下载sqlsyslogd源码包，由于是整个目录下载，所以会下载index.html打头的索引文件

[root@server2 software]# wget -d -r -np http://www.frasunek.com/sources/security/sqlsyslogd/

[root@server2 software]# cd www.frasunek.com/sources/security/sqlsyslogd/

[root@server2 sqlsyslogd]# rm -rf index.html*

[root@server2 sqlsyslogd]# cd contrib/

[root@server2 contrib]# rm -rf index.html*

[root@server2 contrib]# cd

[root@server2 ~]# mv /usr/local/src/software/www.frasunek.com/sources/security/sqlsyslogd/ /usr/

local/src/software/

3:make,复制sqlsyslogd二进制程序到/usr/local/sbin目录下

[root@server2 ~]# cd /usr/local/src/software/sqlsyslogd/

[root@server2 sqlsyslogd]# make

cc -O6 -Wall -pipe -I/usr/local/include -DCONF=\"/usr/local/etc/sqlsyslogd.conf\" -L/usr/local/lib/mysql -lmysqlclient sqlsyslogd.c -o sqlsyslogd

[root@server2 sqlsyslogd]# cp sqlsyslogd /usr/local/sbin/

4[/b]：执行下sqlsyslogd程序，出现下面的命令选项则说明安装成功

[/b][root@server2 sqlsyslogd]# sqlsyslogd

usage: sqlsyslogd [-h hostname] <-u username> [-p] <-t table> [database]

5[/b]：修改/etc/ld.so.conf文件，并使其生效，这个文件维护着编译的动态链接库位置

[/b][root@server2 sqlsyslogd]# cat /etc/ld.so.conf

include ld.so.conf.d/*.conf

/usr/local/lib/mysql

[root@server2 sqlsyslogd]# ldconfig

6[/b]：在数据库中创建相应的库和表

[/b][root@server2 sqlsyslogd]# mysql

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 158

Server version: 5.1.36-log Source distribution

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> create database syslog;

Query OK, 1 row affected (0.00 sec)

mysql> use syslog

Database changed

mysql> create table logs (Id int(10) NOT NULL auto_increment,Timestamp varchar(16),Host varchar(50),Prog varchar(50),Mesg text,PRIMARY KEY (id));

Query OK, 0 rows affected (0.01 sec)

mysql> exit

Bye

7[/b]：该文件定义了连接数据库的密码

[/b][root@server2 sqlsyslogd]# cat /usr/local/etc/sqlsyslogd.conf

123456

8[/b]：在syslog-ng主配置文件中添加下列配置

[/b][root@server2 sqlsyslogd]# vi /usr/local/syslog-ng/etc/syslog-ng.conf

destination sqlsyslogd{

program("/usr/local/sbin/sqlsyslogd -u root -t logs syslog -p");

};

log {

source(s_remote);

destination(sqlsyslogd);

};

9:[/b]重启syslog-ng服务

[/b][root@server2 sqlsyslogd]# service syslog-ng restart

Stopping Kernel Logger: [ OK ]

Starting Kernel Logger: [ OK ]

10:[/b]客户端发消息测试

[/b][root@server2 sqlsyslogd]# tail -1 /var/log/syslog-ng/20100226/192.168.90.1/messages

Feb 26 14:25:47 192.168.90.1 root[6058]: just for fun