I have downloaded and extract logstash 6.2.4 on linux machine on /opt/mount1 drive .
Created 5 conf files in bin directory.
When i give path.data: /opt/mount1/logstash6.2.4/data in logstash.yml fiel i am able to run 2 conf file but while running 3rd conf file getting error instance already running.
Do you really need to run multiple instances of Logstash? That's usually not necessary and is rather wasteful of resources (primarily RAM).
But if you insist, the data directory must be unique to each instance. You can use different logstash.yml files or use the --path.data option when starting Logstash.
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