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#Fluentd + #Norikra でaccess.logとかdstatを扱うめも

Posted at

あとでblog書く、たぶん。
とりあえず途中経過メモ。


nginxの設定

LTSVで扱いたいのでこちらを参考にこんな設定ファイル書いて、

# cat /etc/nginx/log_format.conf 
log_format ltsv 'time:$time_iso8601'
  '\tremote_addr:$remote_addr'
  '\trequest_method:$request_method'
  '\trequest_length:$request_length'
  '\trequest_uri:$request_uri'
  '\thttps:$https'
  '\turi:$uri'
  '\tquery_string:$query_string'
  '\tstatus:$status'
  '\tbytes_sent:$bytes_sent'
  '\tbody_bytes_sent:$body_bytes_sent'
  '\treferer:$http_referer'
  '\tuseragent:$http_user_agent'
  '\tforwardedfor:$http_x_forwarded_for'
  '\trequest_time:$request_time'
  '\tupstream_response_time:$upstream_response_time'
;

nginx.confでincludeする。

# grep log_format.conf /etc/nginx/nginx.conf 
  include /etc/nginx/log_format.conf;

対象のスコープでこんな感じに指定。

# grep ltsv /etc/nginx/conf.d/default.conf 
  access_log /var/log/path/to/nginx/access.log ltsv;

fluentdの設定

とりあえずこんな感じ。
まだ試験段階なので各種intervalは短め。

access.logの整数や少数で扱いたい(==String以外)項目はtypesディレクティブで指定する

# cat /etc/td-agent/td-agent.conf
<source>
  type tail
  format ltsv
  tag com.example.srv01.nginx.access
  types request_length:integer,status:integer,bytes_sent:integer,body_bytes_sent:integer,request_time:float,upstream_response_time:float
  path /var/log/path/to/nginx/access.log
  pos_file /var/log/td-agent/nginx/access.log.pos
</source>

<source>
  type dstat
  tag com.example.srv01.dstat
  delay 10
</source>

<match com.example.srv01.**>
  type secure_forward
  shared_key SECURE_FORWARD_PASS
  self_hostname srv01.example.com
  flush_interval 10s
  <server>
    host collector.example.com
    port 24284
  </server>
</match>

norikraのクエリ

fluent-plugin-dstatの出力がこんな感じのJSONなのでちょっと悩んだ。

{
    "dstat": {
        "cpu0 usage": {
            "hiq": "0.0", 
            "idl": "12.345", 
            "siq": "1.234", 
            "sys": "2.3345", 
            "usr": "34.567", 
            "wai": "0.0"
        }, 
        "dsk/sda": {
            "read": "0.0", 
            "writ": "1234.500"
        }, 
        "memory usage": {
            "buff": "142844.0", 
            "cach": "227464.0", 
            "free": "16268.0", 
            "used": "2039700.0"
        }, 
        "net/dummy0": {
            "recv": "0.0", 
            "send": "0.0"
        }
    }, 
    "hostname": "srv01"
}

けどnorikra作者のモリスさんにそのまま扱えると教えていただいて、なんとそのまま扱えてしまった。

select avg(Float.valueOf(dstat.cpu0_usage.usr)) from TARGET_NAME.win:time_batch(1 min)

みたいに書けてすばらしい!

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