GROK parse failure for logstash

Question

I am trying to parse mongo logs using logstash from default mongo.log file.

this is my filter config :

filter {      
  grok {          
    match => ["message", "%{MONGO_SLOWQUERY}"]       
   }
}

I am getting grokparsefailure in this.

Can anyone please help me out with this.

Answer 1

the macro you used match this type of logs:

MONGO_LOG %{SYSLOGTIMESTAMP:timestamp} \[%{WORD:component}\] %{GREEDYDATA:message}
MONGO_QUERY \{ (?<={ ).*(?= } ntoreturn:) \}
MONGO_SLOWQUERY %{WORD} %{MONGO_WORDDASH:database}\.%{MONGO_WORDDASH:collection} %{WORD}: %{MONGO_QUERY:query} %{WORD}:%{NONNEGINT:ntoreturn} %{WORD}:%{NONNEGINT:ntoskip} %{WORD}:%{NONNEGINT:nscanned}.*nreturned:%{NONNEGINT:nreturned}..+ (?<duration>[0-9]+)ms
MONGO_WORDDASH \b[\w-]+\b
MONGO3_SEVERITY \w
MONGO3_COMPONENT %{WORD}|-
MONGO3_LOG %{TIMESTAMP_ISO8601:timestamp} %{MONGO3_SEVERITY:severity} %{MONGO3_COMPONENT:component}%{SPACE}(?:\[%{DATA:context}\])? %{GREEDYDATA:message}

According to: logstash-patterns-core

Probably your message doesn't fit the patterns. You could try if your message fit, using the Grok Debugger: Grok Debugger

Regards