November 2021
Beginner to intermediate
239 pages
4h 15m
Chinese
Content preview from Dapr学习手册
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服务
｜
83
1.7.2 OAM
开放应用模型（
Open Application Model
）（
https://oam.dev/
）是一个开源项目，
旨在为云原生应用提供一种平台无关的建模语言。
OAM
描述了由多个相互连
接的组件组成的应用程序的拓扑结构。它关注的是应用拓扑，而不是单个服
务的编写方式。
Dapr
进入了更深的层次，为云原生应用提供通用的编程模型
和支持运行时。正如在本章前面所看到的，
Dapr
可以处理服务名称解析和调
用路由。同时，
Dapr
可以配置为与现有的服务网格系统一起使用，以在服务
之间提供微调的流量控制。图
1-7
显示了
OAM
的逻辑拓扑、
Dapr
路由和服
务网格策略是如何相互叠加的。
组件
组件
组件
网格
网格 网格
图
1
-
7
：OAM 和 Dapr 的关系
OAM
允许将特征（
trait
）附加到每个组件上以控制其行为，如伸缩。例如，
下面的手动伸缩特性可以将一个前端组件伸缩到五个副本：
apiVersion: core.oam.dev/v1alpha1
kind: ApplicationConfiguration
metadata:
name: custom-single-app
annotations:
version: v1.0.0
description: "Customized version of single-app"
spec:
variables:
components:
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