当我们提到SOA（Service-Oriented Architecture）架构的时候想到的是什么？松耦合（Loosely Coupled）？服务拆解？面向服务？
其实个人觉得相对于单机架构来讲，SOA架构解决的是业务可用性，相关服务的水平扩展，以及资源再利用，管制，流程审核等等等。这点其实和当今很火的微服务概念很像，都是以服务作为单位，都比较在意服务的治理和服务复用，微服务其实也是在SOA上做的改进，当然微服务更多强调的是“业务需要彻底的组件化和服务化”，其实本人多Spring Cloud等一些JAVA系的产物并没有什么好感，如果希望拿到一个高性能的RPC框架，可以尝试 TARS 。
如上图所示，SOA架构就是这样的，通过各个服务模块，将较为复杂的业务拆分治理，它的特点是服务是无状态的，即服务在被调用前后本身没有变化，且同一个服务允许同时在多台计算机上运行。那么正是因为如此，就诞生了一系列的中间件产品比如服务总线（service bus），API 网关（API Gateway），消息队列（MQ/kafka）
Kubernetes属于主从分布式架构，主要由Master Node和Worker Node组成，以及包括客户端命令行工具kubectl和其它附加项。Master Node：作为控制节点，对集群进行调度管理；Master Node由API Server、Scheduler、Cluster State Store和Controller-Manger Server所组成；
Worker Node：作为真正的工作节点，运行业务应用的容器；Worker Node包含kubelet、kube proxy和Container Runtime；kubectl：用于通过命令行与API Server进行交互，而对Kubernetes进行操作，实现在集群中进行各种资源的增删改查等操作；
AWS 的 AWS Lambda 在 Serverless 界是有统治地位的，但是由于各种原因，AWS Lambda 在中国国内鲜为人知，它的理念更多是提倡弱后端，弱运维，以最小的成本来实现业务功能。来用一个很短的视频看下把
除了AWS Lambda 还有腾讯云的 SCF，阿里云的函数计算等等，其实Serverless更多看的还是基于Serverless所做的产品附加功能，比如 AWS DynamoDB，AWS API Gateway等等一系列的附加功能，来实现Serverless的易用化与独立性。最近腾讯云出了 SCF （HTTP）版的云函数，可以直接通过HTTP访问请求，感兴趣的童鞋可以去看看。
所以 Serverless 相对于容器，传统SOA不论从设计架构，纬度，和应用方法上都不尽相同，Serverless将SOA的服务概念，容器的工作节点概念，拆分到函数，这就代表如果使用Serverless必须实现业务的云原生，最简单的例子就是如果要把一个单体应用拆分成10个容器，100个函数，并且每个都具有独立的部署周期以及复杂的依赖图，配合成熟健壮的CI/CD以及自动化的系统。把这些和Serverlss一起使用的时候，将会大幅提升敏捷性和创新性，但是如果仅仅只有其中一个，那么带来的损失远大于收益。
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