DEV Community: sarvsav

Day007 - Random posts under TIL

sarvsav — Sun, 20 Oct 2024 19:34:15 +0000

Topics:

GoReleaser

Day006 - Random posts under TIL

sarvsav — Sat, 19 Oct 2024 18:29:22 +0000

Topics:

Couple approved HomeOps driven by k8s
LetsEncrypt

1. Couple approved HomeOps driven by k8s

If you want to explore more about k8s and would like to setup at your home, these 2 repos are the good resource.
Wife approved HomeOps driven by Kubernetes and GitOps using Flux - onedr0p/home-ops
Husband-approved geeked homelab k8s cluster deployed on 🍏 Mac Minis with Talos Linux; automated via Flux, Renovate and GitHub Actions 🤖 - buroa/k8s-gitops

These repos are updated with latest technologies and follow the gitops flow for easy traceability and maintainability.

2. LetsEncrypt
LetsEncrypt: A nonprofit Certificate Authority providing TLS certificates to 450 million websites.

Day005 - Random posts under TIL

sarvsav — Fri, 18 Oct 2024 21:14:01 +0000

Topics

Best practices in Python

1. Best practices in Python
Read this article on Writing Python Scripts in modern way by Bryson Meiling and it is very insightful. In summary,

use pyproject.toml instead of requirements.txt.
Use uv for virtual environment.
Use type hints.
Add raises section to the docstrings.
Use pydantic models.
Use linter and formatter like Ruff.
Use pytest.
Use orjson instead of json.
Always use fstring.
Use pathlib instead of os.path.
Use Typer instead of argparse.

Day004 - Random posts under TIL

sarvsav — Thu, 17 Oct 2024 19:23:56 +0000

Topics:

Question: How to write better tests?

1. Question: How to write better tests?
Not much for today. Posted the below question on reddit.

What if I write unit test or system test in wrong pattern, will it lead to bad codebase too? Learning how to write good tests is also a skill, and it takes time to learn that skill. However, if I need to follow deadlines, I cann't spend much time in learning test skill, so I may write bad pattern while writing test. Will it lead it to double efforts in the future as the code base is also built around that test. Or what is the best way to start a project. For example, chicago vs london unit testing to understand which one is good choice, I need time to learn it. Most of the tests are end up in TDD with just 2 cases to show that I have 100% coverage, though I am not sure if it is true or not. Kindly share your advice on how can I improve it as not testing even writing optimize test is also required.

Day003 - Random posts under TIL

sarvsav — Wed, 16 Oct 2024 19:48:18 +0000

Topics:

Bookmarks manager
Observability (from zero to hero)
Cyphernetes
Comment all entries in crontab
starship

1. Bookmarks manager
Linkding - A self hosted bookmarks manager with minimal design and easy to setup using docker. If you are interested to design your own bookmarks manager, then there are tips by user I<3RMS on writing a good bookmark manager under this reddit post.

1. Bookmark dedupe - I often bookmark all of my tabs because I'm afraid of losing them all when Firefox crashes (rare but happens).
2. Automatic weeding out of pages that have gone 404 or domains expired etc or just generally not retrievable anymore.
3. Automatic grouping by topic and sorting by date added.
4. Auto bookmark a tab that has been open for more than x days because it's probably something important to me.

2. Observability (from zero to hero)
Whenever writing a log message, it should answer why not what. There is a good write up by Abhishek Veeramalla on observability. It covers broad topics and detailed description about it using Go. Details can be found here. It covers below topics:

Day 1: Introduction to Observability
Day 2: Prometheus - Setting Up Monitoring
Day 3: Metrics and PromQL in Prometheus
Day 4: Instrumentation and Custom Metrics
Day 5: Logging with EFK Stack
Day 6: Distributed Tracing with Jaeger
Day 7: OpenTelemetry – Setting Up Unified Observability

3. Cyphernetes by Avital Tamir
Cyphernetes - A Kubernetes Query Language.

Turn your boring kubectl shell commands

# Select all zero-scaled Deployments in all namespaces,
# find all Ingresses routing to these deployments -
# for each Ingress change it's ingress class to 'inactive':

kubectl get deployments -A -o json | jq -r '.items[] | select(.spec.replicas == 0) | \
[.metadata.namespace, .metadata.name, (.spec.selector | to_entries | map("\(.key)=\(.value)") | \
join(","))] | @tsv' | while read -r ns dep selector; do kubectl get services -n "$ns" -o json | \
jq -r --arg selector "$selector" '.items[] | select((.spec.selector | to_entries | \
map("\(.key)=\(.value)") | join(",")) == $selector) | .metadata.name' | \
while read -r svc; do kubectl get ingresses -n "$ns" -o json | jq -r --arg svc "$svc" '.items[] | \
select(.spec.rules[].http.paths[].backend.service.name == $svc) | .metadata.name' | \
xargs -I {} kubectl patch ingress {} -n "$ns" --type=json -p \
'[{"op": "replace", "path": "/spec/ingressClassName", "value": "inactive"}]'; done; done

Into magical declarative syntax

# Do the same thing!

MATCH (d:Deployment)->(s:Service)->(i:Ingress)
WHERE d.spec.replicas=0
SET i.spec.ingressClassName="inactive";

It can be installed using below command:

go install github.com/avitaltamir/cyphernetes/cmd/cyphernetes@latest

4. Comment all entries in crontab
To disable all entries in crontab:

crontab -l | awk '{print "# "$1}' | crontab

5. starship
Starship written in rust is the minimal, blazing-fast, and infinitely customizable prompt for any shell! You can download from here. The video by Andrew gives a detailed explanation on configuring the starship.

Thank you for reading and supporting. Kindly like it, if you find it helpful.

Day002 - Random posts under TIL

sarvsav — Tue, 15 Oct 2024 19:14:16 +0000

Topics:

JSONCrack
adr-er (architectural decision records)
Hangman game by Patrik
Battle Tested Golang
Change default shell of OpenSSH in Windows

1. JSONCrack
A wonderful tool for visualizing your JSON data in form of graphs or connected nodes. JSONCrack is written in typescript and available on GitHub. Moreover, these graphs are interactive in nature. There is also a VS Code editor extension available on the marked place named JSON Crack.

2. ard-er by Kevin Ard
Architectural decision records by Kevin is MIT Licensed and written in Go. The project is hosted on GitHub named: adr-er. Based on GitHub adr organization:

An Architectural Decision (AD) is a justified design choice that addresses a functional or non-functional requirement that is architecturally significant. An Architecturally Significant Requirement (ASR) is a requirement that has a measurable effect on the architecture and quality of a software and/or hardware system. An Architectural Decision Record (ADR) captures a single AD and its rationale; the collection of ADRs created and maintained in a project constitute its decision log. All these are within the topic of Architectural Knowledge Management (AKM), but ADR usage can be extended to design and other decisions (“any decision record”).

More details can be found here.

This project is good motivation to learn about TUI apps also.

3. Hang_an ga_e by Patrik

There is a tutorial by Patrik on YouTube on how to write a Hangman using Go.

4. Battle tested Golang

Go is simple, and maintenance is minimal. It provides backward compatibilty.

Boring is good. Boring is stable. Boring means being able to focus on your work, not on what's different about Go. - Go Blog

Look at this article about Go toolchains by Elton Minetto that got introduced in Go 1.21.

5. Change default shell of OpenSSH in Windows

Windows with all the power of bash would be a great experience. By installing GitBash on windows, we can have most of the default tooling available. However, while doing ssh to the machine using OpenSSH, you will endup in Powershell. To change the default shell to gitbash you need to update the key Computer\HKEY_LOCAL_MACHINE\SOFTWARE\OpenSSH\DefaultShell and detailed post can be found here.

Thank you for reading and supporting. Kindly like it, if you find it helpful.

Day001 - Random posts under TIL

sarvsav — Mon, 14 Oct 2024 19:27:49 +0000

Topics:

LogSeq
Style Guides
Bash Commands
Dazel
Jenkins and Gerrit (testing latest patchset)

1. LogSeq - Notes taking app.
Notes taking is a good habit, and I was using obsidian for a very long time, and today I across a new tool named logseq.
They are complimentary to each other and I will use them for journaling.

2. Style Guides
While taking notes, it is a good habit to learn about styling. A note with styles are better to read. It's good to follow one, instead of develop a new one. I would be going to use the below style guide for Go programming and markdown for notes taking.

Markdown style guide by Google
Go Programming style guide by Google
Go Programming style guide by Uber

3. Bash - How to create a file name with today's date and time?

touch "$(date +"%Y_%m_%d_%I_%M_%p").log"

4. dazel
Dazel - Run Google's bazel inside a docker container via a seamless proxy. Bazel is a nice build tool and with help of dazel, we can easily run it without installing anything. Written in python and easy to install.

5. Jenkins and Gerrit
Scenario: Need to test your pipeline repo code changes in real environment. Add a new parameter named your_awesome_repo_refspec and use this refspec in gitscm while cloning the repo and test it against the rest of the code on your real jenkins agent. You can read the detailed article here on my medium post.

Thank you for reading and supporting. Kindly like it, if you find it helpful.