Have logstash automatically parse any .json files

Elastic Stack Logstash
1

I'm planning on shipping lots of logs into logstash. Is it possible to configure logstash in such a way so that only if a file ends with .json it would go through:

json {
        source => "message"
      }

Thanks ahead!

2

You can do this via the file input plugin:

input {
  file {
    path => "/mydirectory/*.json"
    codec => "json"
  }
}

(Or maybe codec json_lines depending on your file)

Hope this helps!

3

Thanks for the response!

I actually direct everything to logstash. It just listens for port 5044 for beats. The question is, within the filter{}, what should I put to check if it’s a .json file.

Thanks ahead

4

If you're using filebeat you should be able to configure it to only send json files.

If you absolutely need to filter in logstash then the event should have a field with the filename in it (possibly path?). You should be able to use an if statement, something along these lines (untested)

filter {
  if [path] !~ /\.json$/ {
     drop {}
  }
  ...
}

Any help?

5

Thanks for the response,

I’m actually looking to filter it filebeat because I intend to do send all the logs to filebeat. It’s just that some would be JSON.

That if statement would be true if it’s not a .json file, right? If I want the condition to be true, then just replace the ! With = right?

6

Ahh right,

You probably then want

filter {
  if [path] =~ /\.json$/ {
     json {
        source => "message"
     }
  }
  ...
}
7

I’ll try it out, thanks!

Just out of curiousity, do you know why it’s bit *.json?

8

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