How to debug the logstash file plugin

问题:

Is it possible to log actions of the logstash file plugin? (i.e. what files it tries to send, what errors happen, etc)

回答1:

In new version stdout format changed

stdout { codec => rubydebug }

回答2:

If you want to debug the process itself you may run it like this

/opt/logstash/bin/logstash -f yourconf.conf -v --debug --verbose

UPDATE: Acording to @neeraj-gupta using --debug and --verbose at the same time may cause a problem when trying to see debug logs of cloudwatch and using only --debug is enough.

回答3:

* * * This method of debugging is now deprecated - see Max's answer above! * * *

Try adding a stdout output with debug set to true. You should be able to see the entire event object and errors / warnings in your logstash --log or stdout.

input {
   file {
      ...
   }
}
output {
   stdout {
      debug => true
   }
   ...
}

Hope that helps!

回答4:

Yes, you can see what files it tries to send, what errors happening through the output section by applying

stdout { codec => rubydebug }

Codec is responsible for giving output. So,here it outputs your event data using the ruby "awesome_print" library.