[Solved] If Elasticsearch is not running, what will be the result of the Logstash output configuration:output { elasticsearch { hosts => ["localhost:9200"] } } | Microservices

Microservices - Monitoring and Observability

If Elasticsearch is not running, what will be the result of the Logstash output configuration:

output { elasticsearch { hosts => ["localhost:9200"] } }

ALogs will be discarded silently

BLogstash will fail to start and show connection errors

CLogstash will buffer logs and retry sending to Elasticsearch

DLogs will be sent to Kibana instead

Step-by-Step Solution

Solution:

Step 1: Understand Logstash behavior on output failure
Logstash buffers logs and retries if Elasticsearch is unreachable.
Step 2: Check options
Logstash will buffer logs and retry sending to Elasticsearch correctly describes buffering and retrying behavior.
Final Answer:
Logstash will buffer logs and retry sending to Elasticsearch -> Option C
Quick Check:
Logstash retries on Elasticsearch failure = Logstash will buffer logs and retry sending to Elasticsearch [OK]

Quick Trick: Logstash buffers logs if Elasticsearch is down [OK]

Common Mistakes:

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