September 2020
Intermediate to advanced
526 pages
8h 23m
Chinese
book
Google SRE工作手册
by Betsy Beyer, Niall Richard Murphy, David K. Rensin, Kent Kawahara, Stephen Thorne
Content preview from Google SRE工作手册
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258
｜
第
11
章
负载均衡系统 负载均衡系统
HTTP
反向代理
（
Google
前 端 ，即
GFE
）
HTTP
反向代理
（
Google
前 端 ，即
GFE
）
后端服务
后端服务
后端负载均衡
全球负载均衡
系 统（
GSLB
）
图
11
-
3
：全球负载均衡系统（GSLB）
种信号来更新
GFE
的后端，这不会影响正常运行时间。通过将
GFE
的后端设置为健
康检查会失败的状态，而同时继续响应正在进行的请求，我们可以在不中断任何用
户请求的情况下，优雅地从服务中删除
GFE
的后端。我们把它称为“跛脚鸭”模式，
我们在第一本
SRE
书的第
20
章中有更详细的讨论。
GFE
还为所有最近活动的后端维护持久会话，从而在请求到达时立即使用连接。这
种策略有助于降低用户的延迟，特别是在我们使用
SSL
保护
GFE
与后端之间连接的
时候。
GCLB
（
Google
云负载均衡系统）：低延迟
我们的网络配置策略的目标是降低服务到最终用户的延迟。通过
HTTPS
协议建立安
全连接时，要在客户端和服务器之间进行两次网络往返。所以，要尽可能地减少请
求时间的延迟是相当重要的。为此，我们将网络的范围扩展到
Maglev
主机和
GFE
。
这些组件在终结
SSL
上已经非常靠近用户，然后再通过长加密连接将请求转发到网
络中更深层次的后端服务。
管理负载
｜
259
用户
数据中心路由器 数据中心路由器 ...
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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.