CatOps

26 Nov 2023 20:40

A new issue of the CatOps Newsletter is here!

Also, we have a great CyberWeek deal: you can subscribe to CatOps on Telegram, WhatsApp, or Substack for free instead of $0! Don’t miss it!

#digest #newsletter

CatOps

23 Nov 2023 18:33

Backstage is not an Internal Developer Portal, but a framework to build one.

This article highlights an important difference between the two. Basically, you won’t get an IDP out of the box with Backstage, you need to put some time and effort to make it useful and this fact leaves people, who thought otherwise, frustrated.

Also, it’s interesting how the author draws a parallel with Kubernetes. I would argue that Kubernetes is also a framework to build a platform and not an out of the box solution.

#backstage #idp

CatOps

20 Nov 2023 13:01

​​Today let’s continue helping Pavlo and Naya with drones, telecom equipment, and tactical medicine.

- Pavlo’s requisites
- Naya’s requisites

See the attached picture for this week’s goals.

#donations #Ukraine

CatOps

16 Nov 2023 16:03

Чисто нагадати, що сьогодні ми будемо робити Говорилку CatOps про менторство, а точніше: як стати хорошим ментором.

Стартуєм о 20:00 по Києву (19:00 по Берліну) в чаті.

Посилання на Говорилку

#voicechat

CatOps

14 Nov 2023 09:30

​​Terraform variable validation, when 2+ vars depend on each other

Basically, where is the answer in SO how to do it in 0.13+ via locals, but it does not include some important details:

This check works only for known during terraform plan values of variables.
If value of any of variables in the check is not known during terraform plan, the check will be skipped and error message will pop up only after terraform apply in the next terraform plan.

The pic below is an example of how that check works.


Note, that there is a feature request to make able to refer to other variables in the variable condition check, but that's needs architecture redesign, so there no ETA when we can drop that hack.

P.S. You can achieve something similar by using lifecycle precondition and postcondition in case if you support only TF 1.2+


#terraform

CatOps

12 Nov 2023 12:27

A train edition of the CatOps Digest is here!

A couple of highlights from that digest related to CatOps itself:

- We are going to have a voice chat on Thursday at 20:00 Kyiv (19:00 Berlin) time.
- You can now follow CatOps on WhatsApp! I haven’t figured out yet if it’s possible to use markdown or any other formatting there but still.

#digest #newsletter

CatOps

10 Nov 2023 11:50

Here's dekel_malul/balancing-security-and-operability-for-eks-cluster-907fb6b91f4a">a neat article with some good practices regarding security when configuraing an EKS cluster.

If you work with AWS and Kubernetes a lot, it won't give you any dramatic insights, but you could still use it as a checklist / cheat sheet when configuring a cluster, since it's easy to forget something when there are many moving parts.

#aws #kubernetes

CatOps

06 Nov 2023 13:33

​​For today’s Donations Monday I suggest supporting Pavlo and Naya, who are raising funds different equipment for the AFU.

This week their goal is to get 4 drones, 2 EcoFlows, and a thermal vision unit.

- Pavlo’s Requisites
- Naya’s Requisites

#donations #Ukraine

CatOps

01 Nov 2023 09:58

AWS Karpenter is in beta now.

Karpenter is AWS’ tool to manage and autoscale node pools in Kubernetes, which has more features compared to the Cluster Autoscaler and has deeper integration with AWS features. Yet, support for other major clouds is somewhere in the roadmap, IIRC.

This article in particular, describes what are the changes in Karpenter Beta compared to the previous versions and also guides you through depreciations and upgrade notes.

#kubernetes #aws

CatOps

29 Oct 2023 13:32

A new issue of the CatOps Digest is here!

#digest

CatOps

26 Oct 2023 13:33

An interesting insight into Facebook's internal architecture. Basically, because of their size they could create a vast serverless platform for internal use that handles trillions of requests.

This article is a summary of a whitepaper published earlier. You can find this whitepaper in PDF format here. I haven't read it yet, though.

#serverless

CatOps

23 Oct 2023 13:22

​​For today's Donations Monday, I'd like to remind you about the Protect the Sky fundraiser by Come Back Alive and Nova Posta.

This is a very important fundraiser that helps Ukrainian Air Defence units.

#donations #Ukraine

CatOps

20 Oct 2023 12:12

The latest episode of our voice chat (in Ukrainian) is now available!

We spoke about documentation: where to store it, how to write it and how to make people read it.

You can find it on:

- YouTube
- Substack
- Spotify
- Apple Podcasts
- Google Podcasts

Enjoy!

#voice #говорилка

CatOps

17 Oct 2023 13:31

Today, I'd like to share with you a series of articles that I currently read. It's called "Let's code a TCP/IP stack" and it provides a very nice insight into the Linux networking stack. I'm still going through all the articles but I'm sharing all of them here:

1. Let's code a TCP/IP stack, 1: Ethernet & ARP
2. Let's code a TCP/IP stack, 2: IPv4 & ICMPv4
3. Let's code a TCP/IP stack, 3: TCP Basics & Handshake
4. Let's code a TCP/IP stack, 4: TCP Data Flow & Socket API
5. Let's code a TCP/IP stack, 5: TCP Retransmission

#networking

CatOps

16 Oct 2023 14:14

Today I just want to remind you about this fundraiser

CatOps

24 Nov 2023 14:57

​​git branches: intuition & reality - an explainer by Julia Evans.

#git

CatOps

21 Nov 2023 15:20

I think I have posted something like this before, but anyway...

Here's a two part story of how to optimize memory usage of a Go application just by reshuffling fields in structs.

Part one provides some theory on this matter, while part two has some benchmarking results.

I'm not trying to say that you should run and reshuffle fields in all your Go structs right now. Especially, if you're satisfied with the memory consumption of your app - sometimes it makes sense to optimize for readability or just store pointers in structs.

However, these articles describe some details of how memory allocation works in Go, which you may find interesting.

#programming #go

CatOps

18 Nov 2023 13:18

TemaBit (a part of Fozzy Group) TemaBitFozzyGroup/terraform-integration-at-temabit-fozzy-group-achieving-impactful-outcomes-5f534e67a78a">wrote an article on how to manage SonarQube with Terraform. They’ve also mentioned that they manage GitLab with Terraform, but without examples.

A nice quick read for weekend that shows that Terraform is not just for Infrastructure (i.e. cloud) but basically a thin glue code for providers that can manage whatever you want.

#terraform

CatOps

16 Nov 2023 12:28

Starting from February 1, 2024 AWS will charge their customers $0.005 per IP per hour

This number doesn't look huge without a perspective, however this might add some significant networking costs to some topologies. Thus, the best time to move your things into private subnets was a couple of years ago, the second best time is now.

#aws

CatOps

13 Nov 2023 10:52

​​It's getting colder, so I would like to remind you to support the Air Defence Forces!

You can do it by donating to the joint fundraiser by Nova Posta and Come Back Alive - Protect the Sky.

The goal is to raise 330M UAH ($8.9M) for Ukrainian Air Defence.

#donations #Ukraine

CatOps

11 Nov 2023 14:36

This article with a clickbait title got my attention recently. It was even translated in Ukrainian by one of the largest Ukrainian developers-oriented media.

The most interesting part of this article, in my opinion, isn’t its premise and even not the points that the author is making (some of those points are 5 years late, TBH). The thing that caught my attention was what the author chooses to compare Kubernetes to. And those are managed platforms like Heroku, etc.

This is interesting for a couple of reasons: first of all it seems like other orchestration solutions are out of the table already. Second, it reaffirms the statement of Viktor Farcic (you can find those in the Den Vasyliev’s blog). Basically, the idea is that in the future Kubernetes will “disappear”. Not in the sense that it will fade away, but in the same way hypervisors have “disappeared”. The majority of us use them today, but we rarely think about what virtualization powers our cloud instances, etc. In the same way at some point there will an extendable API that allows one to run workloads and whatever cluster technology is underneath would be a concern of a cloud provider.

#kubernetes

CatOps

07 Nov 2023 08:56

An article that could be a tweet (xeet?) but with more context.

tl;dr: avoid Helm hooks when possible.

I totally agree with the statement, yet an example in this article is rather weak. Anyways, if you need to have some imperative actions for your app, it’s always better to use higher level abstractions like ordering on the CD tool level or even an operator.

Having an init container that has access to the API is rather a security concern than a workaround.

#kubernetes

CatOps

02 Nov 2023 14:38

If you want to learn SQL, or you know somebody who wants (or should, lol), or you want to refresh your SQL skills, you can use interactive lessons on SQL Bolt.

They're simple, but good enough to get up to speed with the basics.

#databases

CatOps

30 Oct 2023 16:10

DOU, KOLO та «Шалені Кабани» збирають 5 млн грн на 4 Mini Sharks для «Альфи» СБУ 🦈🔥

БО «Шалені кабани» — ініціатива, яку добре знайома DevOps-спільноті. На літній офлайн-події для девопсів в Києві ми зібрали гроші на мотор для човнів морської піхоти, а пізніше — ще.

До речі, новини про висадку українських морпіхів на лівому березі Херсонщини мають безпосередній стосунок до човників, над якими працюють «Кабани».

Тож, коли ми готували спільний збір, не мали жодного сумніву, що девопси активно підтримають колег та задонатять на 4 Mini Shark для ЦСО «А» СБУ («Альфа»). Адже потрібно зібрати 5 000 000 грн!

Приєднуйтесь! 📌
Лінк для донатів 💵

CatOps

27 Oct 2023 15:25

There’s a new test functionality in Terraform v1.6.0.

You can read more about writing tests for your Terraform projects in this article, which also has examples of the tests.

For someone who values tests for IaC, I’m very glad that such functionality is a part of the core. Although, I haven’t been working much with Terraform lately, implementing tests for Helm charts yielded some great results. I hope to write an article in that one day.

P.S. This article was kindly sent right into my inbox by Terraform Weekly. Do not hesitate to subscribe, you’d like to get the latest news on the most popular IaC tool.

#terraform #hashicorp

CatOps

24 Oct 2023 15:18

Programming Book Bundle by Packt.

I don’t know if you do programming day-to-day. Also, this channel is more OPS oriented, I would say.

However, you may find some interesting stuff there.

#programming #books

CatOps

21 Oct 2023 15:16

A comparison between EKS and AKS.

Tors article provides some insights into what to expect from each managed service. It’s a pity, GKE is not included into this comparison, I’ve heard a lot of good things about GKE. I believe, this is because this article originated from a specific use-case.

#kubernetes #aws #azure

CatOps

18 Oct 2023 13:50

Videos from DevOps Days 2023 are available on YouTube now!

#slides

CatOps

16 Oct 2023 14:14

​​With your help we managed to deliver 18 medical kits to the 27th Separate Bataillon!

We had a new request from them for the winter boots and a thermal vision. We had some money left from the previous fundraiser, so the winter boots are on their way to the frontlines already. Now, we are raising funds for the thermal vision!

The goal is 85k UAH (~2200 EUR). This is the price for the thermal vision, but we still have money left. So, we will “break” the Monobank jar as soon as we have the required amount from all the sources.

Also, we work together with the UA Responders foundation to be clear on all the legal stuff. So, you can also donate to their PayPal or SWIFT, since Monobank sometimes has issues accepting money from the EU cards. Please, put “27” in the message if you donate via PayPal or SWIFT, so we know that these money are meant for the 27th Battalion.

You can find all the requisites via this link: https://quicknote.io/145c93c0-6612-11ee-8acd-1fef365d67eb

Разом переможемо!

#donations

CatOps

15 Oct 2023 16:39

A new issue of the CatOps Digest is here!

Yes, I know that I skipped a week but I kinda had an excuse.

https://open.substack.com/pub/catops/p/catops-digest-2023-10-15

#digest #newsletter