9.ElasticSearch预警服务-Watcher详解-监控时间线数据

来看个小例子：固定周期采集数据，并设置数据预警机制

采集数据配置，拉取RSS数据并存储到ElasticSearch中.
1.下载并安装最新的logstash1.5版本

地址：https://www.elastic.co/products/logstash

2.安装rss插件

cd logstash-1.5.0
bin/plugin install logstash-input-rss

3.配置数据采集脚本

input {
  rss {
    url => "http://stackoverflow.com/feeds/tag/elasticsearch+or+logstash+or+kibana"
    interval => 3600 
  }
}
output {
  elasticsearch {
    protocol => "http"
    host => "localhost" 
  }
  stdout { }
}

4.启动logstash

nohup bin/logstash -f rss.conf > logs/rss.log&

5.验证ElasticSearch数据流是否正常
可以通过API，或者Kopf,Head等插件进行验证。

Watcher预警配置

1.首先定义Script文件，采用Groovy语法,将文件放置到$ES_HOME/config/Scripts目录下。

$ES_HOME/config/scripts/threshold_hits.groovy
编辑内容为：
return ctx.payload.hits.total > threshold

2.设置Watcher：

PUT _watcher/watch/rss_watch
{
  "trigger" : {
      "schedule" : {
        "daily" : { "at" : "12:00" } #每天12点执行
    }
  },
  "input" : {
    "search" : {
      "request" : {
        "indices" : [ "logstash*" ],#指定查询索引
        "body" : {
          "query" : {
            "filtered" : {
              "query" : {"match" : {"message": "error problem"}}, #查询条件
              "filter" : {"range" : {"@timestamp" : {"gte" : "now-1d"}}}
            }
          }
        }
      }
    }
  },
  "condition" : {
    "script" : {
      "file" : "threshold_hits",#脚本文件名称
      "params" : {
        "threshold" : 0 #参数
      }
    }
  },
  "actions" : {
    "send_email" : { #请注意ElasticSearch.yml中的邮件服务器配置信息，可参考之前的文章介绍
      "email" : {
        "to" : "[email protected]",  
        "subject" : "Somebody needs help with ELK",
        "body" : "The attached Stack Overflow posts were tagged with Elasticsearch, Logstash, or Kibana and mentioned an error or problem.",
        "attach_data" : true
      }
    }
  }
}

3.调试Watcher配,通过以下API可以，立刻执行配置的Watcher

POST _watcher/watch/rss_watch/_execute
{
  "trigger_event" : {
    "schedule" : {
      "triggered_time": "now",
      "scheduled_time": "now"
    }
  },
  "ignore_throttle" : true,
  "simulated_actions" : "_all",
  "record_execution" : true
}

4.验证是否可以收到预警邮件。

9.ElasticSearch预警服务-Watcher详解-监控时间线数据

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