LogStash filter介绍（九）

LogStash plugins-filters-grok介绍

官方文档：https://www.elastic.co/guide/en/logstash/current/plugins-filters-grok.html

常用于对日志的拆分，如apache日志

grok利用正则表达式进行匹配，拆分日志。它提供一些常用的预定义的正则表达式名称，用于直接匹配。

预定义文件路径 /opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-patterns-core-2.0.5/patterns

grok-patterns文件包含apache预定义。

logstash所有预定义的可以通过 如下地址查看

https://github.com/logstash-plugins/logstash-patterns-core/tree/master/patterns

自己写的规则可以通过如下地址，做debug测试

http://grokdebug.herokuapp.com/

 

grok插件使用

1）标准输入、标准输出

input {
    stdin {}
}

filter {
    grok {
        match => { "message" => "%{IP:client} %{WORD:method} %{URIPATHPARAM:request} %{NUMBER:bytes} %{NUMBER:duration}" }
    }
}

output{
    stdout{
        codec => rubydebug
    }
}

启动/opt/logstash/bin/logstash -f /etc/logstash/conf.d/grok.conf

输入测试数据 55.3.244.1 GET /index.html 15824 0.043

 

apache日志收集

本示例为收集默认的apache日志，如果自定义apache日志格式，需要编写自定义的正则表达式，通过grok进行匹配

1、标准输出

input {
    file {
        path => "/etc/httpd/logs/access_log"
		start_position => "beginning"
    }
}

filter {
    grok {
        match => { "message" => "%{COMBINEDAPACHELOG}" }
    }
}

output{
    stdout{
        codec => rubydebug
    }
}

启动/opt/logstash/bin/logstash -f /etc/logstash/conf.d/grok_apache.conf

2、elasticsearch插件输出

input {
    file {
        path => "/etc/httpd/logs/access_log"
		start_position => "beginning"
    }
}

filter {
    grok {
        match => { "message" => "%{COMBINEDAPACHELOG}" }
    }
}

output{
    elasticsearch {
        hosts => ["192.168.137.11:9200"]
        index => "apache-accesslog-%{+YYYY.MM.dd}"
    }
}

启动/opt/logstash/bin/logstash -f /etc/logstash/conf.d/grok_apache.conf

 

转载于:https://www.cnblogs.com/shhnwangjian/p/6253688.html