June 2021
Intermediate to advanced
290 pages
9h 21m
Chinese
Content preview from Node与Express开发（第2版）
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考虑生产环境中的问题
｜
123
process.on('uncaughtException', err => {
// 在这里做一些必要的清理工作，例如关闭数据库连接
Sentry.captureException(err)
process.exit(1)
})
12.4.3
使用多台服务器完成水平扩展
尽管通过集群来实现水平扩展可以最大化单台服务器的性能，但如果你需要更多的服务
器呢？这个时候事情就会变得更复杂一些。为了实现这种并行，你需要一个
代理
服务器。
（它常被叫作
反向代理
或
面向转发的代理
，以便与通常用于访问外网的代理区分开，但我
觉得这种叫法既让人糊涂又没必要，所以就简单地把它叫作代理。）
当今两大主流代理服务器是
NGINX
（发音
“
engine X
”） 和
HAProxy
。尤其是
NGINX
，用
户增长非常快。最近我给我们公司做了一个竞品分析，发现我们
80%
以上的竞争对手在使
用
NGINX
。
NGINX
和
HAProxy
都是稳定的高性能代理服务器
，即便是最苛刻的应用，它
们都能支持。（如果你想要证据，
Netflix
就是一个很好的例子
，它占了
整个互联网流量
的
15%
，而它使用的正是
NGINX
。）
还有几个小一些的基于
Node
的代理服务器
，比如
node-http-proxy
。如果你的要求不是太
高，或者是用于开发，轻量级代理服务器是很好的选择。对于生产来说，我还是推荐使用
NGINX
或
HAProxy
（两者都是免费的，不过它们也提供付费服务）
。
安装和配置代理服务器超出了本书范畴，但这些可能并不像你想象中那么困难（尤其是使 ...
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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.
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.