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Let's imagine that I have a Logstash instance running, but would like to stop it cleanly, to change it's configs for example.
How can I stop the Logstash instance, while ensuring that it finish sending the bulks to Elasticsearch? I don't want to loose any logs while stopping logstash.
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If Logstash fails or its buffer overflows, logged events are lost. If it crashes or is taken offline for maintenance, all queued events are lost.
Verify Service is Running The most basic thing to check is the status of the Logstash status: sudo service logstash status.
With Logstash 2.3:
Logstash keeps all events in main memory during processing. Logstash responds to a SIGTERM by attempting to halt inputs and waiting for pending events to finish processing before shutting down.
Source: https://www.elastic.co/guide/en/logstash/2.3/pipeline.html
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