> For the complete documentation index, see [llms.txt](https://csunny.gitbook.io/etcd/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://csunny.gitbook.io/etcd/introduce/storage/consensus_algorithm.md).

# 共识算法

在上一节我们提到了，为了多节点中多副本数据的一致性，提出来一致性协议，而针对一致性协议又衍生出了很多的一致性算法。 简单来讲，共识算法又可以分为下面几部分:

* 开放网络
  * 区块链公链
    * pow (proof of power)
    * pos (proof of stake)
    * dpos (Delegated proof of stake)
    * ripple
  * 区块链联盟链
    * pbft (Practical Byzantine Fault Tolerance）)
    * dbft(Delegated Byzantine Fault Tolerant))
* 内部网络
  * 分布式一致性系统
    * paxos
    * raft  

![](https://raw.githubusercontent.com/csunny/etcd-from-arch-to-souce-code/master/_asserts/images/consensus_algorithm.jpg)

当然在这里，我们不打算介绍区块链领域里面的那些共识算法，感兴趣的同学，可以访问我的[github](https://github.com/csunny)来查看，在里面我有解释， 以及具体的代码实现。本书中，我们只介绍raft共识算法。


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