A Technical I.T./DevOps Blog
Problem scenario
You read that you should not run a Docker container as root or with sudo privileges. Can you start the docker service with sudo systemctl start docker?
Solution
Yes, it is acceptable. You can use this:
sudo systemctl start docker
This solution was taken from https://docs.docker.com/config/daemon/systemd/.
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Continue reading “Is It a Best/Recommended Practice to Run “sudo systemctl start docker”?”
Question
In I.T., what does abstract or the act of abstraction mean?
Answer (Disambiguation of abstraction)
Examples
For TCP/IP Networking
The seven layers of the OSI model are abstractions. (This was taken from worlddidac.org.)
For Containerization
We find this quote in Docker Up and Running (by Matthias &
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Continue reading “What Does the Verb To Abstract Mean in Computing?”
Problem scenario
You heard that income tax on a company’s bonus are taxed at a higher rate. Is this true?
Answer
Yes. To calculate your approximate tax liability, you could use this website for informational purposes:
(You may want to talk to an accountant before relying on the statements here. This is not legal or tax advice.)
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Continue reading “Are Income Taxes on a Bonus the Same Rate as a Regular Paycheck?”
Problem scenario
You have heard about AWS VPC Peering Connections. Should you use them?
Solution
The short answer is “yes.”
Some “best practices” for VPCs are merely step-by-step directions for setting it up while describing options that you may or may not want to take. This posting, on a technical blog of a large reputable company, was cited in The DevOps Handbook (on page 404).
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Continue reading “Is It a Best/Recommended Practice to Use AWS VPC Peering Connections?”
Problem scenario
You have a program as follows:
class Location:
def __init__(self, country=”US”, state=”CA”, city=”Los Angeles”):
self.country = country
self.state = state
self.city = city
def printer(self):
return [self.country, self.state, self.city]
new_loc = Location(“Mexico”, “Mexico City”, “Mexico City”, “good neighborhood”)
print(new_loc.printer())
Here are your choices of what it could print out:
a. TypeError: init() takes from 1 to 4 positional arguments but 5 were given
b.
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Problem scenario
A staffing company wants you to agree to give a 15 or 30 day notice before you voluntarily leave. But they have to give you no notice. One attorney said that in that business model, this is common. Another attorney says that it is not unreasonable to ask for this clause to be reciprocal. You do not think that the company will agree to making it reciprocal. Is it possible for the project owner to give a contractor advance notice that the contract will end sooner than expected?
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Problem scenario
You are curious if a clustered index is the same as the table in PostgreSQL. You are familiar with SQL Server tables. Do PostgreSQL tables have clustered indexes like SQL Server tables have?
Answer
No. The source is here.
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Continue reading “Do PostgreSQL Tables Have Clustered Indexes like SQL Server Database Tables Have?”
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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