rsyslogd集中log服务器搭建分享

用途：

搭建集中日志管理系统，以用于后续朔源。默认情况下 rsyslog 服务是开启的，不过日志文件一般是保存在 var/log 本地目录下，对于有经验收的入侵者，入侵以后一般会清空  var/log 或者本机上所有的log文件，造成无法朔源的后果，集中日志服务器可解决该问题

一、服务端搭建（内网IP:192.168.225.83）

默认情况下 rsyslog 是安装好的，所以就如何安装 rsyslog 不再描述，百度上应该有很多

1、防火墙配置，增加如下命令

iptables -A INPUT -m state --state NEW -m udp -p udp -i eth0 --dport 514 -j ACCEPT

iptables -A INPUT -m state --state NEW -m tcp -p tcp -i eth0 --dport 514 -j ACCEPT

注意，一定要保存，重启iptables 

service iptables save

service iptables restart 

2、配置 rsyslog配置文件

配置文件路径：\etc\rsyslog.conf

配置如下，直接贴文件了，以下是我扩配置文件, 注意，为防止log把系统盘撑爆，以及超级大文件的产品，本服务器在配置的时候将保存目录移动  /mnt/log 下，文件保存方式为一天一个文件，格式为 security_20180321 ...., 方便查询

# rsyslog v5 configuration file

# For more information see /usr/share/doc/rsyslog-*/rsyslog_conf.html

# If you experience problems, see http://www.rsyslog.com/doc/troubleshoot.html

#### 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!  

#/mnt/log/%FROMHOST-IP%_%$year%%$month%%$day%messages.log

#*.info;mail.none;authpriv.none;cron.none                /mnt/log/messages

#为信息加上日志时间  

$template logformat-message,"%TIMESTAMP:::date-mysql% %FROMHOST-IP%%msg%\n"  

#定义的日志文件的名称，按照年月日  

$template DynFile-message,"/mnt/log/message-%$year%%$month%%$day%.log"  

#写入日志文件

*.info;mail.none;authpriv.none;cron.none                ?DynFile-message;logformat-message 

# The authpriv file has restricted access.

#authpriv.*                                              /mnt/log/secure

#为信息加上日志时间  

$template logformat-secure,"%TIMESTAMP:::date-mysql% %FROMHOST-IP%%msg%\n"  

#定义的日志文件的名称，按照年月日  

$template DynFile-secure,"/mnt/log/secure-%$year%%$month%%$day%.log"  

#写入日志文件

authpriv.*                ?DynFile-secure;logformat-secure 

# Log all the mail messages in one place.

#mail.*                                                  -/mnt/log/maillog

#为信息加上日志时间  

$template logformat-maillog,"%TIMESTAMP:::date-mysql% %FROMHOST-IP%%msg%\n"  

#定义的日志文件的名称，按照年月日  

$template DynFile-maillog,"/mnt/log/maillog-%$year%%$month%%$day%.log"  

#写入日志文件

mail.*                ?DynFile-maillog;logformat-maillog 

# Log cron stuff

#cron.*                                                  /mnt/log/cron

#为信息加上日志时间  

$template logformat-cron,"%TIMESTAMP:::date-mysql% %FROMHOST-IP%%msg%\n"  

#定义的日志文件的名称，按照年月日  

$template DynFile-cron,"/mnt/log/cron-%$year%%$month%%$day%.log"  

#写入日志文件

cron.*                ?DynFile-cron;logformat-cron 

# Everybody gets emergency messages

#*.emerg                                                *

#为信息加上日志时间  

$template logformat-emerg,"%TIMESTAMP:::date-mysql% %FROMHOST-IP%%msg%\n"  

#定义的日志文件的名称，按照年月日  

$template DynFile-emerg,"/mnt/log/emerg-%$year%%$month%%$day%.log"  

#写入日志文件

*.emerg                ?DynFile-emerg;logformat-emerg 

# Save news errors of level crit and higher in a special file.

#uucp,news.crit                                          /mnt/log/spooler

#为信息加上日志时间  

$template logformat-spooler,"%TIMESTAMP:::date-mysql% %FROMHOST-IP%%msg%\n"  

#定义的日志文件的名称，按照年月日  

$template DynFile-spooler,"/mnt/log/spooler-%$year%%$month%%$day%.log"  

#写入日志文件

uucp,news.crit                ?DynFile-spooler;logformat-spooler 

# Save boot messages also to boot.log

#local7.*                                                /mnt/log/boot.log

#为信息加上日志时间  

$template logformat-boot,"%TIMESTAMP:::date-mysql% %FROMHOST-IP%%msg%\n"  

#定义的日志文件的名称，按照年月日  

$template DynFile-boot,"/mnt/log/boot-%$year%%$month%%$day%.log"  

#写入日志文件

local7.*                ?DynFile-boot;logformat-boot

# ### 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 ###

3、重启 rsyslogd 服务，以确保修改的配置文件生效

service rsyslog restart 

二、客户端搭建

1、防火墙配置

同服务端

iptables -A INPUT -m state --state NEW -m udp -p udp -i eth0 --dport 514 -j ACCEPT

iptables -A INPUT -m state --state NEW -m tcp -p tcp -i eth0 --dport 514 -j ACCEPT

注意，一定要保存，重启iptables 

service iptables save

service iptables restart 

2、配置文件配置

注意此处与服务端配置有区别, 注意红色加粗部妥，填写Log服务器的IP地址即可，以下为Tcp主式

# rsyslog v5 configuration file

# For more information see /usr/share/doc/rsyslog-*/rsyslog_conf.html

# If you experience problems, see http://www.rsyslog.com/doc/troubleshoot.html

#### 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 tcp

# *.* @remote-host:514 udp

*.* @@192.168.225.83:514

# ### end of the forwarding rule ###

3、重启 rsyslog 服务

service rsyslog restart

三、测试

在客户机上测试如下命令：

logger 'hello word'

在服务器上的目录  /mnt/log 下将会有一个 messages_xxxxxxxx 其内容最后一行为 'hello word' 

至此说明配置成功

四、注意事项

当测试不通过时注意安全组或者外围防为墙的配置