How to make custom Logstash start parameters / arguments

Elastic Stack Logstash
1

Hi,

Logstash takes a lot of file parameters while starting like;

--path.settings=/logstash-5.0.0/config/

I want to pass something like, for example, I have a jdbc input in logstash and how can I pass it through command line argument when I start logstash like;

--dbname=my_log_db

Is this possible?

2

I don't think so, but you can reference environment variables: https://www.elastic.co/guide/en/logstash/current/environment-variables.html

3

Ok.. So, could you tell me how logstash is identifying these parameters, or in which ruby file these are defined?

4

I don't understand your question. Are you asking where you should set the values of the environment variables?

5

Hi, I meant, not environment variables, but the command line flags. Hows logstash recognizing it, or which ruby file is responsible for parsing the command line flags?

6

You're probably looking for runner.rb.