Logstash is an open source data collection engine with real-time pipelining capabilities. Logstash can dynamically unify data from disparate sources and normalize the data into destinations of your choice. Cleanse and democratize all your data for diverse advanced downstream analytics and visualization use cases.

Kibana is an open source analytics and visualization platform designed to work with Elasticsearch. You use Kibana to search, view, and interact with data stored in Elasticsearch indices. You can easily perform advanced data analysis and visualize your data in a variety of charts, tables, and maps.

Logstash is an open source data collection engine with real-time pipelining capabilities. Logstash can dynamically unify data from disparate sources and normalize the data into destinations of your choice. Cleanse and democratize all your data for diverse advanced downstream analytics and visualization use cases.

Metrcbeat Reference

Filebeat Reference

Elastic英文社区

主从模式，一般有两个目的，一是保证高可用，另一个是提升性能，比如开启读写分离。

分多少个库和分多少张表，提前确定好，避免后期变化引起再平衡（rebalance）【迁移或重建】的麻烦，但是由于前期的量还没有达到，可以复用机器来减少开支，根据量的发展情况再独立出来。