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Explanation

Logstash is a data processing tool used in DevOps to collect, transform, and forward logs from multiple sources to destinations such as Elasticsearch.

Code:

Explanation

A Logstash pipeline has three stages: Input, Filter, and Output. Logs are collected, processed, and then sent to a target system.

Code:

Input -> Filter -> Output

Explanation

Input plugins collect logs from sources such as files, applications, databases, and message queues.

Code:

input { file { path => '/var/log/app.log' } }

Explanation

Filter plugins parse and transform log data by extracting useful information from raw log messages.

Code:

filter { grok { match => { 'message' => 
'%{LOGLEVEL:level} %{GREEDYDATA:msg}' } } }

Explanation

Output plugins send processed logs to destinations such as Elasticsearch for searching and Kibana for visualization.

Code:

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