March 2023
Beginner to intermediate
266 pages
4h 30m
Chinese
Content preview from FinOps云成本优化
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140
｜
第
13
章
使用预留实例和承诺使用折扣减少支出
扣一样，你不能将容量预留分配给任何特定的实例，因此在该账户中运行的第一个匹配
实例将使用这个容量预留。
设置为区域性的
EC2
预留实例将对该地区的任何可用性区域应用折扣，但不包括支持容
量预留。并且区域性预留实例可以与按需容量预订相结合，实现跨区域预留实例的折扣。
区域性预留实例保留在一个特定的可用性区域内，并且让你的区域性预留实例折扣应用
到容量预留上。
实例大小的灵活性
购买
EC2
预留实例支持匹配特定的实例大小（
Small
、
Medium
、
Large
、
Xlarge
等）。预
留实例将对与其规模相匹配的资源给予折扣。但是，对于区域性
Linux
和
UNIX
预留实例，
你可以从前面提到的称为实例大小灵活性
(ISF)
的特性中获益。你目前拥有的或计划购
买的具有
Linux
、区域性和共享租赁属性的预订将自动成为
ISF
类型的预留实例。
ISF
允许预留实例对同一实例族（
m5
、
c5
、
r4
等）内不同大小的实例应用折扣。单个大
型预留实例可以对多个较小的实例应用折扣，而单个小型预留实例可以对大型实例应用
部分折扣。
ISF
使你可以灵活地改变实例的大小，而不损失预留实例所申请的折扣。因为，
你不需要指定预留实例的确切大小来覆盖所有不同大小的实例，所以你可以将购买的预
留实例拆分成小规格的实例。
图
13-3
展示了如何应用
ISF
的一种方式，每列表示在一个小时内运行的实例。对于
r5
和
c5
类型，
large
（
L
）是最小的实例大小。在这个例子中，如果你的目标是
100%
的预
留实例使用率，那么你需要购买 ...
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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.