The 
Book
Now updated for Logstash v5!
Designed for SysAdmins, Operations staff, Developers and DevOps who want to deploy the Elasticsearch, Logstash & Kibana (ELK) log management stack.
Buy the book!
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- Buy the book on Amazon Kindle, Google Play or Nook.
Sample Chapter
You can read a sample chapter here. The chapter introduces you to collecting logs without using the Logstash agent.