January 2023
Intermediate to advanced
458 pages
14h 16m
Chinese
Content preview from 可编程网络自动化
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352
｜
第
9
章
StackStorm
中所有可扩展方式的基本分发单位——传感器、规则、工作流和动作都是
用文本文件定义的，这些文件被放置在包中，使之得以被引用。例如，传感器
napalm.
LLDPNeighborDecrease
就位于
napalm
包中。并非所有的包都是默认安装的，但通过
CLI
命
令可以从
StackStorm
Exchange
中轻松安装新的包。例如，要想下载
napalm
包，只需执行
如下代码即可。
st2 pack install napalm
这样，
napalm
包中所有的动作、工作流、传感器或规则就可以用于
StackStorm
实例了。
现在，我们已经了解了这些基本概念，接下来讨论一下
StackStorm
的工作原理。
9.4.2
StackStorm
架构
StackStorm
其实并不是单个组件，而是多个彼此协作的微服务，共同促成了事件驱动自动
化（参见图
9-5
）
。由于
StackStorm
的分布式特性，各个组件可以根据需要独立地伸缩。这
也使得各种功能在出现故障的情况下更有弹性。
图例：
StackStorm
组件
第三方必备软件
数据库连接
AMQP
连接
图 9-5：StackStorm 组件
4
如果你知道你的工作流涉及的步骤繁多，但又不想监视要启动的诸多事件，那么可以使用
一些额外的
st2actionrunner
组件来处理负载。如果想处理大量的事件，那么可以用同样
的方式来扩展
st2sensorcontainer
组件。
注
4
：
该图的彩图可到图灵社区本书主页（
ituring.cn/book/2092
）
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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.