August 2019
Beginner to intermediate
232 pages
3h 50m
Chinese
Content preview from Web容量规划之美
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164
第
5
章
你可以在多个服务器上运行命令，但你应该这样做吗？一般来说，通过收集系统
相关的特定数据（可能是未来趋势预测工具来测量的系统信息）来对这些程序加
以有效地利用。这种方法对于调试和练习也非常有用。首先应遵循的一条原则是：
如果某种能数据不应该收集成度量指标，或不影响服务器的状态，就没有大碍。
什么时候这个方法不适用呢？在任何适合使用配置管理的情况下，你都应该犹豫。
总会有因为特殊情况而做的配置改变让你后悔。
示例 2：多数据中心
最终，你想要解决最大的单点故障问题——数据中心。即使你的数据中心经历了灾
难性的电力故障或者其他灾难，你仍希望能够继续提供服务。当你将基础架构扩
大到多个物理站点时，你将体会到在更大规模的基础上自动化所带来的收获。除
了灾难恢复，地理上分散的云网站或内部部署数据中心用于最小化“线时间增加
用户体验”。如
Amazon
、谷歌、
Facebook
、
Twitter
、微软在全球有多个数据中心。
同样地，
Netflix
在全世界不同的
AWS
地区建立了自己的服务。
建立另外一个数据中心从理论上看起来是一个大难题，要使现有的系统就绪需要
花费数月甚至数年的时间。怎样才能在另一个位置快速重建数据中心呢？自动化
部署可以使这个从无到有的过程变得没那么困难。
不同于在本地站点基于主机到主机的复制每个系统，这一过程是如下展开的：
•
在新的数据中心建立管理机。基础安装可能是手动的，但配置管理则不是（管
理机的配置也应当包含在配置管理中）。
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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.
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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.