Date Filter Doesn't Work

Elastic Stack Logstash
1

I have a message like this:

14/Jul/18 15:18:55 44.130.128.195 GET /url111 200 853 3 - - -

Filter:
filter {
grok {
match => { "message" => "%{MONTHDAY:day}/%{MONTH:month}/%{YEAR:year} %{TIME:time} %{IP:client_ip} %{WORD:method} %{NOTSPACE:uri_query} %{NUMBER:status} %{NUMBER:bytes} %{NUMBER:response_time}" }
}
date {
match => [ "logdate" , "dd/MMM/yy HH:mm:ss" ]
locale => "en"
timezone => "Asia/Hong_Kong"
target => "@timestamp"
}
}

In the output, the @timestamp is the parsing time instead of the timestamp in log message.
i.e.
Actual: "@timestamp" => 2018-10-02T11:37:25.708Z
Expected: "@timestamp" => 2018-07-14T15:18:55Z

Hope experts here can help.

2 
Conf:

    input {

    file {

    path => "/path/to/file"

    start_position => "beginning"

    }

    }

    filter {

    grok {

    match => { "message" => "%{MONTHDAY:day}/%{MONTH:month}/%{YEAR:year} %{TIME:time} %{IP:client_ip} %{WORD:method} %{NOTSPACE:uri_query} %{NUMBER:status} %{NUMBER:bytes} %{NUMBER:response_time}" }

    }

    date {

    match => [ "timestamp" , "dd/MMM/yy HH:mm:ss" ]

    locale => "en"

    timezone => "Asia/Hong_Kong"

    target => "@timestamp"

    }

    }

    output {

    stdout { codec => rubydebug }

    }
3

Please show what your stdout output produces for an example input line.

4

Conf:

input {
  file {
    path => "/var/path/to/file"
    start_position => "beginning"
  }
}
filter {
  grok {
    match => { "message" => "%{MONTHDAY:day}/%{MONTH:month}/%{YEAR:year} %{TIME:time} %{IP:client_ip} %{WORD:method} %{NOTSPACE:uri_query} %{NUMBER:status} %{NUMBER:bytes} %{NUMBER:response_time}" }
  }
  date {
    match => [ "timestamp" , "dd/MMM/yy HH:mm:ss" ]
    locale => "en"
    timezone => "Asia/Hong_Kong"
  }
  geoip {
     source => "client_ip"
  }
}

output {
  stdout { codec => rubydebug }
}

Output:

{
             "time" => "15:18:55",
         "@version" => "1",
        "client_ip" => "203.198.53.198",
             "path" => "/var/path/to/file",
           "method" => "GET",
              "day" => "14",
           "status" => "200",
            "geoip" => {
              "latitude" => 22.291,
                    "ip" => "203.198.53.198",
          "country_name" => "Hong Kong",
             "city_name" => "Central District",
        "continent_code" => "AS",
             "longitude" => 114.15,
              "timezone" => "Asia/Hong_Kong",
         "country_code3" => "HK",
         "country_code2" => "HK",
              "location" => {
            "lat" => 22.291,
            "lon" => 114.15
        }
    },
       "@timestamp" => 2018-10-04T07:22:06.690Z,
            "month" => "Jul",
             "host" => "ip-10-10-1-221",
             "year" => "18",
          "message" => "14/Jul/18 15:18:55 49.130.128.195 GET /xxx 200 100 3 - - -",
        "uri_query" => "/xxx",
            "bytes" => "100",
    "response_time" => "3"
}
5

Your event doesn't contain a timestamp field so the date filter obviously can't do anything. You can replace the beginning of your grok expression with

(?<timestamp>%{MONTHDAY}/%{MONTH}/%{YEAR} %{TIME})

to extract such a field that contains the whole timestamp.

6

Thanks!!! It's work!!!!!

This technique is very useful when we deal with the non standard date time format.

Conf:

input {
  file {
    path => "/path/to/file"
    start_position => "beginning"
  }
}
filter {
  grok {
    match => { "message" => "(?<timestamp>%{MONTHDAY}/%{MONTH}/%{YEAR} %{TIME}) %{IP:client_ip} %{WORD:method} %{NOTSPACE:uri_query} %{NUMBER:status} %{NUMBER:bytes} %{NUMBER:response_time}" }
  }
  date {
    match => [ "timestamp" , "dd/MMM/yy HH:mm:ss" ]
    locale => "en"
    timezone => "Asia/Hong_Kong"
    target => "@timestamp"
  }
  geoip {
     source => "client_ip"
  }
  mutate {
      remove_field => [ "timestamp",  "[geoip][ip]", "path", "logdate", "year", "month", "day", "time" ]
  }
}

output {
  stdout { codec => rubydebug }
}

Output:

{
          "message" => "14/Aug/18 15:19:00 101.1.16.3 GET /url 200 853 4 - - -",
            "bytes" => "853",
             "host" => "ip-10-10-1-221",
           "method" => "GET",
         "@version" => "1",
        "uri_query" => "/url",
            "geoip" => {
             "longitude" => 114.15,
              "location" => {
            "lon" => 114.15,
            "lat" => 22.2833
        },
        "continent_code" => "AS",
         "country_code3" => "HK",
              "latitude" => 22.2833,
              "timezone" => "Asia/Hong_Kong",
          "country_name" => "Hong Kong",
         "country_code2" => "HK"
    },
        "client_ip" => "101.1.16.3",
       "@timestamp" => 2018-08-14T07:19:00.000Z,
    "response_time" => "4",
           "status" => "200"
}
7

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