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本文针对LogStash常用插件grok和geoip的使用进行说明：
一、使用grok输出结构化数据
编辑 first-pipeline.conf 文件，修改为如下内容：
input{#stdin{type => stdin}file {# 读取文件的路径path => ["/tmp/access.log"]start_position => "beginning"}
}filter{grok{match => {"message" => "%{COMBINEDAPACHELOG}" }}}output{stdout{codec => rubydebug}
}启动./logstash -f ../config/first-pipeline.conf后输出就为结构化的数据了：
{"message" => "140.77.188.102 - - [25/Jun/2022:05:11:33 +0800] \"GET /api/ss/api/v1/login/getBaseUrl HTTP/1.1\" 200 103 \"-\" \"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/534+ (KHTML, like Gecko) BingPreview/1.0b\"","response" => "200","auth" => "-","bytes" => "103","referrer" => "\"-\"","host" => "nb002","@version" => "1","agent" => "\"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/534+ (KHTML, like Gecko) BingPreview/1.0b\"","@timestamp" => 2022-06-26T00:28:24.302Z,"timestamp" => "25/Jun/2022:05:11:33 +0800","ident" => "-","httpversion" => "1.1","path" => "/tmp/access.log","clientip" => "140.77.188.102","verb" => "GET","request" => "/api/ss/api/v1/login/getBaseUrl"
}
二、使用grok对输出数据进行修改
编辑 first-pipeline.conf 文件，修改为如下内容：
input{#stdin{type => stdin}file {path => ["/tmp/access.log"]start_position => "beginning"}
}filter{grok{match => {"message" => "%{COMBINEDAPACHELOG}" }}mutate{# 重命名字段rename => {"clientip" => "cip"}}mutate{# 移出特定字段remove_field => ["timestamp","agent"]}
}output{stdout{codec => rubydebug}
}重新启动./logstash -f ../config/first-pipeline.conf 后，往 /tmp/access.log 中新增一条数据，看输出：发现"clientip" 变成了 “cip” 和timestamp agent 字段已经没有了。NICE
{"verb" => "GET","@timestamp" => 2022-06-26T00:48:28.224Z,"referrer" => "\"-\"","path" => "/tmp/access.log","auth" => "-","message" => "140.77.188.102 - - [25/Jun/2022:05:11:33 +0800] \"GET /api/ss/api/v1/login/getBaseUrl HTTP/1.1\" 200 103 \"-\" \"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/534+ (KHTML, like Gecko) BingPreview/1.0b\"","@version" => "1","ident" => "-","response" => "200","bytes" => "103","request" => "/api/ss/api/v1/login/getBaseUrl","httpversion" => "1.1","host" => "nb002","cip" => "140.77.188.102"
}三、使用geoip过滤器插件
使用geoip过滤器插件，可以增强数据。
geoip插件可以针对IP地址进行地理位置信息来源的查找
编辑 first-pipeline.conf 文件，修改为如下内容：
input{#stdin{type => stdin}file {path => ["/tmp/access.log"]start_position => "beginning"}
}filter{grok{match => {"message" => "%{COMBINEDAPACHELOG}" }}mutate{# 重命名字段rename => {"clientip" => "cip"}}mutate{# 移出特定字段remove_field => ["timestamp","agent"]}geoip{# 由于上面将clientip修改为了cip，故此处配置cip，如果没有rename字段则用clientipsource => "cip"}
}output{stdout{codec => rubydebug}
}
重新启动./logstash -f ../config/first-pipeline.conf 后，往 /tmp/access.log 中新增一条数据，看输出：发现输出结果中新增了geoip 字段，并展示了地区、国家、省份、经纬度等地理位置信息。
外国ip示例：
{"host" => "nb002","auth" => "-","bytes" => "103","cip" => "140.77.188.104","@version" => "1","message" => "140.77.188.104 - - [25/Jun/2022:05:11:33 +0800] \"GET /api/ss/api/v1/login/getBaseUrl HTTP/1.1\" 200 103 \"-\" \"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/534+ (KHTML, like Gecko) BingPreview/1.0b\"","verb" => "GET","request" => "/api/ss/api/v1/login/getBaseUrl","referrer" => "\"-\"","response" => "200","ident" => "-","path" => "/tmp/access.log","@timestamp" => 2022-06-26T00:58:11.786Z,"geoip" => {"country_code3" => "FR","longitude" => 4.85,"ip" => "140.77.188.104","continent_code" => "EU","region_name" => "Rhône","country_code2" => "FR","timezone" => "Europe/Paris","country_name" => "France","region_code" => "69","latitude" => 45.748,"postal_code" => "69007","location" => {"lat" => 45.748,"lon" => 4.85},"city_name" => "Lyon"},"httpversion" => "1.1"
}国内ip示例：
{"host" => "nb002","auth" => "-","bytes" => "103","cip" => "175.30.108.241","@version" => "1","message" => "175.30.108.241 - - [25/Jun/2022:05:11:33 +0800] \"GET /api/ss/api/v1/login/getBaseUrl HTTP/1.1\" 200 103 \"-\" \"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/534+ (KHTML, like Gecko) BingPreview/1.0b\"","verb" => "GET","request" => "/api/ss/api/v1/login/getBaseUrl","referrer" => "\"-\"","response" => "200","ident" => "-","path" => "/tmp/access.log","@timestamp" => 2022-06-26T01:00:11.972Z,"geoip" => {"country_code3" => "CN","longitude" => 125.3247,"ip" => "175.30.108.241","continent_code" => "AS","region_name" => "Jilin","country_code2" => "CN","timezone" => "Asia/Shanghai","country_name" => "China","region_code" => "JL","latitude" => 43.88,"location" => {"lat" => 43.88,"lon" => 125.3247},"city_name" => "Changchun"},"httpversion" => "1.1"
}