A Technical I.T./DevOps Blog
Question
In the context of Kubernetes, what is a validation webhook?
Answer
They are an API invocation to confirm a resource was created properly. Unlike a mutating webhook, validation webhooks make no changes to resources deployed in Kubernetes. Also unlike a mutating webhook, validation webhooks happen at a different step in the admission controller process. The admission controller process starts with an API request and ends with persisting data to etcd.
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Question
You are considered using ordered dictionaries in Python (e.g., because of the way they handle temporal data). Will your program use more memory this way compared to using a regular dictionary?
Answer
Yes. All things being equal, ordered dictionaries use more memory than normal dictionaries.
# You will see that Python 3’s ordered dictionaries consume more memory than regular dictionaries
# This was adapted from https://lerner.co.il/2019/05/12/python-dicts-and-memory-usage/
import sys
from collections import OrderedDict
x = OrderedDict()
y = {}
for i in range(1, …
Continue reading “Do Ordered Dictionaries in Python Consume More Memory than Regular Dictionaries?”
In November of 2017 Continualintegration.com posted What is DevSecOps (or DevOpsSec, SecDevOps, or rugged DevOps)?. At the time, Indeed found 192 jobs with a search for “devsecops”. Today, 2/10/22, in four years and three months later, Indeed returns 19,002 jobs for a search of “devsecops.” There are roughly 100x as many jobs now that include the word “devsecops” on Indeed. The website has grown, but this is still an amazing finding.
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Problem scenario
You have a task that is supposed to redirect the output to a file. The command produces output when you manually run it. But the output is not getting to the file. What could be wrong?
Possible Solution #1
If there is an error message, Google the error message. If that does not help, scrutinize the command before the error.
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Problem scenario
You want to use gRPC as a proof of concept. What should you do?
Solution
Go here: https://chromium.googlesource.com/external/github.com/grpc/grpc/+/chromium-deps/2016-08-17/examples/python/README.md
You may want to clone this repository:
https://github.com/grpc/grpc
(Look in the directory for the language of your choice; it should have an “examples” directory.)
For using gRPC with Python you can install a certain package;
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Continue reading “How Do You Use gRPC to Learn More about It?”
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Question
What is feature hiding?
Answer
Feature hiding is the practice of toggling or disabling of a feature. The feature may be part of an application, but the users cannot access it or use it. Sometimes code is released in an imperfect way; sometimes there is insufficient confidence to make the feature visible and accessible, but to remove the feature from a release would require too much work.
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Problem scenario
In computing, you have heard of containers. There are many types. Where can you find a disambiguation of containers?
Answers
For SQL Server
In SQL Server for over 10 years, there have been “Foreach Loop Containers”. It is a built-in control flow for SQL Server Integration Services. To read more see this Microsoft page.
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