请原谅我起了这么一个标题党的名字。之前用 Fluentd 搭建过日志收集系统（参见：基于 fluentd 搭建日志收集系统），所以当再次需要搭建日志系统的时候，第一时间就想到了安利一波 Fluentd。结果在浏览官网的时候看到了 Fluent Bit，果断就被安利了。
Fluentd vs Fluent Bit
作为同一家公司出品的日志收集软件，Fluent Bit 自诞生起就不可避免的被拿来和 Fluentd 进行比较。首先说结论，我认为 Fluent Bit 并不是用来替代 Fluentd 的。我们不妨通过官网的介绍来看他们各自的定位：Fluentd 作为一个全功能的 Data Collector，而 Fluent Bit 是作为一个轻量级的 Data Forwarder。
Fluentd is an open source data collector for unified logging layer. Fluentd allows you to unify data collection and consumption for a better use and understanding of data.
Fluent Bit is a Fast and Lightweight Data Forwarder for Linux, OSX and BSD family operating systems. It has been made with a strong focus on performance to allow the collection of events from different sources without complexity.
| Fluentd | Fluent Bit | |
|---|---|---|
| Scope | Containers / Servers | Containers / Servers |
| Language | C & Ruby | C |
| Memory | ~40MB | ~450KB |
| Performance | High Performance | High Performance |
| Dependencies | Built as a Ruby Gem, it requires a certain number of gems. | Zero dependencies, unless some special plugin requires them. |
| Plugins | More than 650 plugins available | Around 35 plugins available |
| License | Apache License v2.0 | Apache License v2.0 |
参考：
http://fluentbit.io/
https://www.fluentd.org/
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