November 2021
Beginner to intermediate
239 pages
4h 15m
Chinese
Content preview from Dapr学习手册
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47
第
1
章
服务
在启用
Dapr
的应用程序中，服务是基本计算单元。而
Dapr
的目标之一是让
你可以使用喜欢的编程语言并以喜欢的方式编写这些服务。
Dapr
与你的服务
部署在一起，并在需要时提供需要的功能，如状态管理、跟踪和安全通信。
本章将引导你了解
Dapr
的各种功能是从何而来的。
1.1
在云出现之前
在
2000
年左右，我（海石）在旧金山的一家金融软件公司工作。在二楼有个
机房，需要用特殊的门禁卡才能进入。机房总是冰冷而嘈杂。但是它却承载
着一家公司运营所需的一切——域名控制器、邮件服务器、文件服务器、源
码库、数据库、测试实验室以及所有的人力资源记录。除了服务器机架外，
房间里还摆满了磁带架，一直堆到天花板。公司定期备份服务器，所有的备
份都存储在这些磁带上。房间里还配备了巨大的纯氮气罐，一旦发生火灾，
就会释放出纯氮气来救火。
IT
人员非常重视保护服务器。他们经常恼火于开发人员要求部署新的服务版
本，毕竟，保证
CEO
的邮箱正常工作是优先级更高的事情。部署新版本是重
大操作：备份服务器，备份数据库，给服务器打补丁，执行数据迁移脚本，
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and much more.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.