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January 19, 2025
Concurrency vs Parallelism
As always: This is for my own understanding. Please don't assume it is 100% correct. Concurrency is handling multiple tasks during the same time. Parallelism is actually doing tasks at the same...
ReadJanuary 18, 2025
Things to Know About Concurrency
Things to know about Concurrency: Why it's important: Devops involves working with systems that might involve multiple processes, threads, or containers running concurrently. Understanding basic...
ReadJanuary 18, 2025
The `awk` Command
To determine whether a website is using only IPv6 or if it supports both IPv4 and IPv6 (dual stack), you can do: If only the IPv6 ping is successful, the site might not support IPv4. If...
ReadJanuary 17, 2025
Bring a Git Subfolder and History to New Repo
Bring a git subfolder and it's history over to start a new repo: https://docs.github.com/en/get-started/using-git/splitting-a-subfolder-out-into-a-new-repository I did this for a repo and it was...
ReadJanuary 12, 2025
Wireshark
Here's some notes on Wireshark, especially filtering results. You need to set an environment variable in a terminal, AND open the browser from that terminal: Then, you need to tell Wireshark...
ReadJanuary 12, 2025
Accessing the Docker Linux Virtual Machine
Docker runs on linux natively, but Docker Desktop works on a Mac by creating a virtual machine, installing Linux, and then running on top of that. So, to do some things, like intercepting network...
ReadDecember 29, 2024
Kubernetes ConfigMap Values
Extract a Specific Key from a ConfigMap: You can use jq or yq to parse JSON or YAML output to get specific values. For example, to get the value of a specific key in a...
December 21, 2024
Command to Find a Command's Shared Libraries
Command to find out what shared libraries an executable needs: ldd /bin/bash eg
When I created a chroot test, I copied /bin/bash and then did the ldd, and it was not...
December 21, 2024
Command to Find a Command's Apt Package
Sometimes I type a command in linux and it's not found. I try to install it and it's not found. Often it will say what package you need to install, but when it doesn't it's usually something...
ReadDecember 21, 2024
Python Instance Types
Python's gettype or instanceof is isinstance().
isinstance() can be used to check for a variety of object types in Python. Here are some common...