March 2022
Intermediate to advanced
532 pages
9h 41m
Chinese
Content preview from 基于Python的DevOps
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监控和日志
｜
201
举个例子，假设我们在一个为网站伺服图像的小型
Python
应用中调用
AWS API
，
我们想监测度量数据的
Python
模块保存在
web/api/aws.py
中。正常情况下，这个路
径的命名空间可以选为
web.api.aws
，但是如果有多个生产应用服务器呢？倘若在
同一个命名空间下传送度量数据，则很难（几乎不可能）更改为其他方案。我们可
以改善一下，使用
{server_name}.web.api.aws
形式的命名空间识别不同的生产服
务器。
这样好多了！可是，你能发现新的问题吗？传送度量数据时，其会在命名空间末
尾添加一个名称。在计数器示例中，名称会变为
{server_name}.web.api.aws.
counter
。
这是个问题，因为这个小型应用会多次调用
AWS
，如
S3
，而且以后可能
还需要与其他
AWS
服务通信。修复子元素的名称要比修复父元素的容易，这里只
需要开发人员尽可能精确地匹配要度量的模块。例如，如果
aws.py
文件中有个
S3
模块，那么就应该把它放入命名空间中，以便与其他部分区分开。这个命名空间的
子元素部分可以是
aws.s3
，而计数器的子元素部分则变成了
aws.s3.counter
。
命名空间中有很多变动部分，这可能会给人一种冗长的感觉，但很多成熟的度量服
务都允许简单组合，如“报告上一周位于东海岸的生产服务器中所有
S3
调用的平
均值”。很强大吧！
此外，还有一个潜在的问题。在生产环境和过渡环境中该怎么办呢？如果换到其他
虚拟机中开发和调试呢？这时，如果每个人都把开发设备称为 ...
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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.