CatOps

31 Aug 2023 13:57

Fixing a memory leak in Kubernetes with a single line of code.

I love such debug stories because you can read them almost as a thriller or a detective literature. Also, this case is very interesting indeed and it took that team a couple of months to figure it out.

A takeaway for myself:
- It‘s useful to have a dashboard (and potentially a monitor) that shows the difference of the node memory usage and the memory usage by pods.

#kubernetes #postmortem

CatOps

27 Aug 2023 21:57

A late night edition of the CatOps Digest is here!

https://open.substack.com/pub/catops/p/catops-digest-2023-08-27

#digest

CatOps

25 Aug 2023 13:51

A new episode of our voice chat (in Ukrainian) is here!

This time we spoke about observability: what vendors and solutions do people use as well as what problems they have encountered. We also briefly touched topics of SLI/SLO/SLA and synthetic monitoring in this episode.

The episode is available on:
- YouTube
- Substack
- Spotify
- Apple Podcasts
- Google Podcasts

Enjoy!

#voice #observability

CatOps

23 Aug 2023 09:30

Amazing article about decision making

It's big but it's worth it.
TLDR version can be "try to understand why it was done in this way, before trying to abolish or replace it with something else. Otherwise, it can get worse than it was."

#culture

CatOps

21 Aug 2023 13:21

Small fundraiser campaigns are good to cover local needs right here, right now.

Currently, my wife is raising 150k UAH to get 18 complete medical kits to the 27th battalion of the 67th brigade of the AFU.

Her brother's girlfriend's relative serves in that battalion.

Requisites for donations:

🎯 Goal: 150 000.00 ₴

🔗 Monobank Jar:
https://send.monobank.ua/jar/5zCptYx1sb

💳 Card number
5375 4112 0823 3556

Thank y'all for your support!

#donations #Ukraine

CatOps

18 Aug 2023 12:38

Avoiding Pitfalls in Go is a good article for those who just starts their journey with this language.

Yet, there are some aspects that are useful even if you use it already. Especially, if your use cases were limited to some simple code.

#programming #go

CatOps

14 Aug 2023 15:58

For the #Donations Monday I would like to remind you about the UA Responders foundation that collects funds for tactical medicine, hospitals and other medical equipment.

I trust these people and I know a couple of them personally.

Thank you for supporting #Ukraine!

CatOps

12 Aug 2023 14:49

AWS NLB now supports security groups! This is amazing and it would’ve prevented a couple of questionable architectural decisions on my side in the past.

P.S. Yet, the most discussed news is the licensing changes by HashiCorp. Unpopular opinion here: nothing changes for you as a practitioner. However, companies like Spacelift and Terramate got hit. Also, big huge cloud providers won’t be able to adopt “Terraform as a Service”. That’s it. Survives the one who can adapt to the new realities the best. And the new realities is that people pay for “service platforms” and not for the code written.

#aws #hashicorp

CatOps

07 Aug 2023 11:28

This Monday, I want to share with you this list of charities you can donate to as well as other ways to support Ukraine.

http://stand-with-ukraine.pp.ua/

#donations #Ukraine

CatOps

02 Aug 2023 14:03

A brief overview of the modern Observability architectures, as well as some ideas on how to consolidate and optimize your Observability stack.

via Sysadmin Tools

#observability

CatOps

31 Jul 2023 14:36

​​For today’s Donations Monday let’s help Pavlo Bondarenko to close this week’s goal of 461252,5 UAH for drones.

- Pavlo’s requisites
- Naya’s requisites

#donations #Ukraine

CatOps

26 Jul 2023 14:06

Dead simple method of profiling your Go applications.

tl;dr:
- Import the github.com/pkg/profile package
- Add defer profile.Start().Stop() into your main function for CPU profile
- Add defer profile.Start(profile.MemProfile).Stop() for memory profile

#programming #golang

CatOps

24 Jul 2023 10:29

​​Today's Donations Monday is for the joint fundraiser by Come Back Alive and Nova Posta - Protect the Sky.

The goal is to raise $8.9 million for Air Defense communications and mobile command posts.

#donations #Ukraine

CatOps

21 Jul 2023 13:20

Friday is a good day to listen to a new episode of our CatOps voice chat!

This time we spoke about investments as well some cultural differences when working in the international teams. Plus, one of the members of our community exposed a scheme of how ruskies are trying to hire people in Ukraine.

The episode is in Ukrainian and available on:

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

#podcast #говорилка

CatOps

18 Jul 2023 13:16

I personally don’t know this publisher. Yet, the titles of some books look interesting. For example, there is a book about FinOps as well as “Kubernetes for Jobseekers” (lol).

This is a Cloud OPS and Development bundle by BPB.

If you know this publisher or have any feedback on these books, feel free to share your impressions in our chat (chat is in Ukrainian).

As usual, you can pay different amount to unlock different number of books. This bundle is active for 20 more days.

#books

CatOps

28 Aug 2023 13:19

As for today, I would like to remind you about the fundraiser that my wife is running currently:

The goal is to get 150k UAH (~3700 EUR) for 18 complete medical kits to the 27th battalion of the 67th brigade of the AFU.

Requisites for donations:

🔗 Monobank Jar:
https://send.monobank.ua/jar/5zCptYx1sb

💳 Card number
5375 4112 0823 3556

Right no, a little bit more than 2/3 is there.

Thank y'all for your support!

#donations #Ukraine

CatOps

26 Aug 2023 08:35

The drama around HashiCorp’s decision to move to Business Source License (BSL) continues. So, now we have OpenTF.

However, today I want to share with you this sane article: hello_9187/why-we-are-not-supporting-opentf-a46855f52dc4">Why We Are Not Supporting OpenTF which pretty much resonates with my thoughts.

P.S. Here is OpenTF if you’re interested.

#hashicorp

CatOps

24 Aug 2023 12:00

​​Happy Independence Day, fellas!
🎉💛💙🎉

CatOps

22 Aug 2023 13:03

Bounded channels is a common way of limiting the concurrency in Go applications.

From deckarep/gos-extended-concurrency-semaphores-part-1-5eeabfa351ce">this article you can learn some theory behind this approach as well as about the sync/semaphore package. I didn’t know about the latter.

#programming #go

CatOps

19 Aug 2023 13:07

Here’s some original content, folks!

I wrote an article on how to create a workflow in GitHub Actions that is triggered with a comment.

There are some caveats with such workflows in GHA. Also, you have to do some additional tweaks to make it better from the UX perspective.

You can read the article:

- In my blog
- On Substack

Hope, you’ll enjoy it!

#github #cicd

CatOps

17 Aug 2023 11:36

I know that many of you, folks, do not like Azure or Microsoft in general. Yet, this is one of the major cloud providers.

So, today I want to share with you a bundle of the materials to help you to get ready for Azure exams.

Ace your Microsoft certification exams bundle on Humble Bundle.

#books

CatOps

14 Aug 2023 09:00

Late CatOps Digest is here!

#digest #newsletter

CatOps

09 Aug 2023 16:06

Just a small announcement: there won’t be many posts this week because I’m traveling.

You may also have noticed that there was no Sunday email last week. Well, I didn’t forget, but since this week is basically out, I’ll send out the newsletter this Sunday instead.

However, I’d like to share with you this book bundle about maths for programmers.

BTW, one of the books in this bundle is written by an Ukrainian (an article is in Ukrainian).

#books

CatOps

03 Aug 2023 13:58

Yet another observability post: Datadog Alternative: When to Move Out? .

This article describes a fairly simple experiment: what would it cost to run Datadog compared to Prometheus & Thanos on different scales.

Although, the scope of the experiment was somewhat limited (no logs, no APM), it provides some numbers that you can use while evaluating different observability solutions.

The bottom line is: with the growth of your technological footprint, Datadog price grows faster compared to the Prometheus stack. Which is true for any SaaS solution compared to self-hosted, I believe.

However, another important considerations is that free software is not "free". You cannot just replace a vendor with an open-source tool and call it a day. You require engineering time to support and maintain those platforms. Therefore, on a smaller scale it might much more effective to use SaaS (especially, if you don't have experts in a given domain in your company yet).

#observability

CatOps

01 Aug 2023 16:19

lingxiankong/best-practice-of-using-argo-workflows-3162708f1bd5">Some good practices for Argo Workflows. I'm not super familiar with this tool, so I'd just list the points here:

- Use common templates
- Limit parallelism to control cluster resources
- Avoid nested loops
- Collect metrics from your workflows
- Use lifecycle hooks
- Control long-running workflows or break down long workflows into separate smaller ones
- Integrate with Argo Events

#argocd #cicd #kubernetes

CatOps

27 Jul 2023 13:57

A way to add existing Helm applications into ArgoCD.

This approach could be helpful if you migrate things to Argo or when you pre-setup specific things into a cluster with Helm but still want to manage those with Argo afterwards.

#kubernetes #argocd #helm

CatOps

25 Jul 2023 18:55

A very cool bundle today! DevOps 2023 bundle by O’Reilly.

As usual, you can pay starting from ~€23 to unlock the whole bundle. And is has some good books like “Implementing SLOs” and “Database Reliability Engineering”.

#books #bundle

CatOps

23 Jul 2023 17:09

Today’s CatOps Digest:

https://newsletter.catops.dev/p/catops-digest-2023-07-23?sd=pf

#digest #newsletter

CatOps

19 Jul 2023 12:26

It may happen that you have a catch-all repository to store some work that may or may not be important. Notice, it's not quite a monorepo pattern, rather a single junkrepo. Like, I saw devops, utils, tools, and similar repositories in quite a few companies.

But what if some things from those repos are actually important, and you want to have a dedicated home for those things? Here's a guide by GitHub that explains how to separate things from a repository while saving the Git history.

This guide is created by GitHub, but it should work with any Git repository. Although, I only tested it with GitHub.

Enjoy!

#git #github

CatOps

17 Jul 2023 13:12

Today's Donations Monday request comes from our friends' channel - Ukrainian DevOps Digest.

They are raising funds for a retransmitter for the 28th brigade.

Here's the link to the Monobak jar: https://send.monobank.ua/jar/2cEiqdkjQ3

Pro-tip: if you copy the Monobank jar link into your mobile browser, you should be able to select Apple / Android Pay as a payment method and thus pay from a different card. It doesn't work all the time, but this is a nice workaround in case you don't have a Monobank or another Ukrainian card.

#donations #Ukraine