​​On Saturday, I gave a talk at the FW Days DevOps conference. I will share the videos with you once they are available.

During the conference, they were raising money for a night vision device PVS-14 for the 4th battalion of the 46th separate brigade.

The goal is to raise 220k UAH, and almost 150k was raised during the conference. Let's help them to close this goal!

Monobank Jar: https://send.monobank.ua/jar/vxr5ywPjM

#donations #Ukraine

What is common between Helm and the article about the abuse of the curl | bash setup to load bad payload?

Year of initial release. But if the article is not more accessible outside the Web Archive, Helm still provides that as a valid installation option.

Anyway, the article is old but gold, worth reading to understand how tricky attakers can be.

#security #bash

Terraform Patterns, Observed. Part 5: Logic in Terraform is a nice article with observations of how people incorporate logic in their Terraform code, even though TF’s logic is somewhat limited.

BTW, as you can see, this is a part 5. Robert has other articles with Terraform observations on his Medium. I highly recommend checking them out as well!

P.S. This article is brought to you (and me) by weekly.tf - a newsletter about the Terraform ecosystem by Anton Babenko. This is a great place to keep up-to-date with Terraform, even if you don’t work with it a lot.

#terraform

For my DevEx specialists out there: What's Next in Measuring Dev Productivity?.

tl;dr: this is kinda a very basic description, but at least it has a table with metrics and some justification behind them. This is why I decided to share it.

#culture #devex

From time to time I’m revisiting old articles that I have saved somewhere or those that just laying around, etc.

Today, I’d like to share with you two articles by Julia Evans on how to learn new skills, which is a skill on its own.

The second article is actually a presentation from the Strangeloop conference on how to reason about things and make hard or confusing things easier to understand.

#education

​​Let’s help Seva to close this fundraising round for a night vision device!

We could close it right away, if only every subscriber of this channel sent ₴6 there.

Monobank jar:

https://send.monobank.ua/jar/vxr5ywPjM

#donations #Ukraine

How Do Websockets Work is a short explainer of websockets by the System Design Newsletter.

BTW, that is a good newsletter, I can totally recommend!

#web

One of the interesting questions when it comes to SLOs is how to define them, in other words, how to set up boundaries to make the SLOs meaningful.

This article by Honeycomb provides some ideas on how to organize your SLOs, so on one hand they represent the user's needs, but on another hand do not cover things that your team cannot control.

#observability #slo #sre

​​Another article from the old stockpiles, and again it's from Julia Evans.

This one is about the ways DNS can break.

It's been a couple of years since this article was published, so some things may be irrelevant today. For example, the issue with DNS over TCP was fixed in musl to my knowledge.

In any case though, this is a nice article that deserves your attention.

#dns #networking

A book bundle on various computer science topics by No Starch Press.

https://www.humblebundle.com/books/computer-science-fun-way-no-starch-books

#books #bundle

The first Spring issue of the newsletter!

https://newsletter.catops.dev/p/catops-digest-2025-03-09

#digest #newsletter

​​I do not have small fundraisers for you today, so let's donate to Serhii Sternenko for FPV drones:

https://send.monobank.ua/jar/2JbpBYkhMv

#donations #Ukraine

How to Scale Elasticsearch to Solve Your Scalability Issues is a neat guide for areas where you could optimize your ElasticSearch clusters.

Ties article doesn’t provide any concrete numbers, but gives plenty of suggestions. It makes sense, since any optimization heavily depends on one’s use case.

#elasticsearch

Git is one of those things, where you can discover new things even after decades of using it.

This article provides some tricks you could do with Git. If you knew those already - that's cool. If not, you're welcome :)

#git

Yet another article from the old archives.

This one is about building a multicluster setup with Kubernetes using Kubernetes tools only. Moreover, there are more tools these days that can help you accomplish the architecture outlined in this article.

For example, you could use ClusterAPI instead of Crossplane for leaf-clusters and so on.

The only sad thing is that Kubernetes doesn’t support federation. So, any viable multi-cluster setup always boils down to two distinct approaches: a bunch of independent clusters, or a single leader with leaves.

#kubernetes

There are two types of folks: those who pin their dependencies to (often) mutable tags and other pointers, and those who already pin to hash sums.

This is true for GitHub Actions as well. For example, most tags in the tj-actions/changed-files repository were repointed to compromised versions by an attacker, potentially affecting 23,000 repositories until GitHub shut down the entire repository.

Manually pinning dependencies can be tedious, so it's better to utilize tools like Renovate. The SpotOnInc/renovate-config preset does exactly that. Note that you can pin it to a hash sum too, just in case ;)

P.S. If you used that GitHub Action, here is a list of possible mitigation steps: antonbabenko/pre-commit-terraform#837.

#security #github #gha

​The highest priority after completing the task is to preserve the life and health of the personnel. So, let's help raise money for tactical medicine!

TL;DR: Donate to Monobank jar till EOW and I will double the amount raised[1].

The Hospitallers Battalion is a volunteer formation known for its professionalism and dedication. When I say "voluntarily," I mean that you can join for a rotation, for example, for 2 weeks, and then return to civilian life for a few months before repeating the process. This flexibility allows specialists who, for various reasons, do not want or cannot join AFU still contribute to defensive operations. However, since the Hospitallers are a volunteer formation, their funding relies on donations from ordinary people.

Currently, the Hospitallers are raising 7.5 million UAH (~$180k) for this spring.
Let's aim to raise at least 10k UAH from CatOps by the end of the week, and I will double the amount raised[1].

Monobank jar: https://send.monobank.ua/jar/6eEHjgDTGq

Btw, the Hospitallers offer courses on first aid and tactical medicine that are available to civilians. I recently took the TCCC ASM (3-day) course, and it was excellent. You can check out their courses at Hospitallers Courses site and track new dates on their Telegram channel.

#donations #Ukraine

[1] But not more than 20k UAH/month from me until the fund campaign is closed or until I have doubled the amount, whichever comes first.

Python is incredibly popular programming language among DevOps / Site Reliability / Platform specialists. It’s also used as the language of choice to build backend in many companies.

So, here is a book bundle by Packt to enhance your Python skills:

https://www.humblebundle.com/books/python-from-beginner-to-advanced-packt-books

P.S. I know that many folks are skeptical about Packt books, so keep this in mind. I still think it worth sharing, though.

Today, I'd like to share with you a nice YouTube channel Polylog, that does short explainer videos about the computer science concepts.

https://www.youtube.com/@PolylogCS

#programming #cs #youtube

A sneak peek into the database design based on two incredible books: "Database Internals" by Alex Petrov and "Designing Data-Intensive Applications" by Martin Kleppmann. Mostly on the first one, though.

This article touches topics of ACID, underlaying data structures (B- & LSM-trees), and distributed systems. Just like the aforementioned books, which I also highly recommend!

A random quote:

> Going distributed should be a last mile resort, introducing it to a system adds a ton of complexity, as we will soon learn. Please avoid using distributed systems when non distributed solutions suffice.

#databases

AWS gives a chance to complete some certifications for free, but with few preconditions

Covered certs:
- Foundational: Cloud Practitioner, AI Practitioner
- Associate: Solutions Architect, SysOps Administrator, Developer, Data Engineer, Machine Learning Engineer

Note, that you need to prepare and pass exam(s) before Aug 2025.

#aws #certification