Rsyslog简介

rsyslog是一个开源工具，被广泛用于Linux系统以通过TCP/UDP协议转发或接收日志消息。rsyslog守护进程可以被配置成两种环境，一种是配置成日志收集服务器，rsyslog进程可以从网络中收集其它主机上的日志数据，这些主机会将日志配置为发送到另外的远程服务器。rsyslog的另外一个用法，就是可以配置为客户端，用来过滤和发送内部日志消息到本地文件夹（如/var/log）或一台可以路由到的远程rsyslog服务器上。

安装Rsyslog守护进程

 yum install rsyslog

Server端配置

[root@opm log]# grep -v "^#" /etc/rsyslog.conf | grep -v "^$"
$ModLoad imuxsock # provides support for local system logging (e.g. via logger command)
$ModLoad imjournal # provides access to the systemd journal
$ModLoad immark  # provides --MARK-- message capability
$ModLoad imudp
$UDPServerRun 514
$ModLoad imtcp
$InputTCPServerRun 514
$WorkDirectory /var/lib/rsyslog
$AllowedSender tcp, 192.168.30.0/24
$ActionFileDefaultTemplate RSYSLOG_TraditionalFileFormat
$template Remote,"/data/log/%fromhost-ip%/%fromhost-ip%_%$YEAR%-%$MONTH%-%$DAY%.log"
:fromhost-ip, !isequal, "127.0.0.1" ?Remote
$IncludeConfig /etc/rsyslog.d/*.conf
$OmitLocalLogging on
$IMJournalStateFile imjournal.state
*.info;mail.none;authpriv.none;cron.none                /data/log/messages
authpriv.*                                              /var/log/secure
mail.*                                                  -/var/log/maillog
cron.*                                                  /var/log/cron
*.emerg                                                 :omusrmsg:*
uucp,news.crit                                          /var/log/spooler
local7.*                                                /var/log/boot.log

a.template Remote,"/data/log/%fromhost-ip%/%fromhost-ip%_%MONTH%-%InputTCPServerRun 514 开启tcp，tcp和udp 可以共存的

Client端配置

[root@test1 ~]# grep -v "^$" /etc/rsyslog.conf | grep -v "^#"
$ModLoad imuxsock # provides support for local system logging (e.g. via logger command)
$ModLoad imjournal # provides access to the systemd journal
$WorkDirectory /var/lib/rsyslog
$ActionFileDefaultTemplate RSYSLOG_TraditionalFileFormat
$IncludeConfig /etc/rsyslog.d/*.conf
$OmitLocalLogging on
$IMJournalStateFile imjournal.state
*.info;mail.none;authpriv.none;cron.none                @@192.168.30.55
authpriv.*                                              /var/log/secure
mail.*                                                  -/var/log/maillog
cron.*                                                  /var/log/cron
*.emerg                                                 :omusrmsg:*
uucp,news.crit                                          /var/log/spooler
local7.*                                                /var/log/boot.log
$template myFormat,"%timestamp% %fromhost-ip%%msg%\n"
$ActionFileDefaultTemplate myFormat

验证，在服务器上进到 /data/log 目录下，进行查看。

收集系统其它服务日志.

[root@node1 ~]# egrep -v ‘^#|^$‘ /etc/rsyslog.conf
$ModLoad imuxsock # provides support for local system logging (e.g. via logger command)
$ModLoad imjournal # provides access to the systemd journal
$ModLoad immark  # provides --MARK-- message capability
$WorkDirectory /var/lib/rsyslog
$ActionFileDefaultTemplate RSYSLOG_TraditionalFileFormat
$IncludeConfig /etc/rsyslog.d/*.conf
$OmitLocalLogging on
$IMJournalStateFile imjournal.state
*.info;mail.none;authpriv.none;cron.none                @@192.168.30.67
authpriv.*                                              /var/log/secure
mail.*                                                  -/var/log/maillog
cron.*                                                  /var/log/cron
*.emerg                                                 :omusrmsg:*
uucp,news.crit                                          /var/log/spooler
local7.*                                                /var/log/boot.log
module(load="imfile" PollingInterval="5")
$InputFileName /var/log/nova/nova-compute.log
$InputFileTag nova-info:
$InputFileStateFile state-nova-info
$InputRunFileMonitor

其实只添加了后5行的内容，对每项简单解释下

module(load="imfile" PollingInterval="5")　　　　　　　　加载imfile 模块，并5秒刷新一次
InputFileTag nova-info:　　　　　　　　　　　　　　　　 定义文件标签 ，注意最后是冒号：
InputRunFileMonitor　　　　　　　　　　　　　　　　　　激活读取，可以设置多组日志读取，每组结束时设置本参数