CatOps

16 Jul 2024 13:05

Many years ago there was an open lecture or rather Q&A in my university by one of Facebook engineers.

He mentioned that they do not use Git, to which I was surprised and asked why. He didn’t provide a concrete answer, since it was like this when he joined.

However, this article may have an answer to why Facebook uses Mercurial instead of Git. “May” because obviously there’s just one viewpoint.

Tl;dr: because they had a unique use case as well as unique amounts of money to contribute to a custom solution. Still, it’s interesting that their initial proposal to contribute to Git was sorta declined.

So, here we are. Does it mean that you also need to switch to Mercurial to be like Facebook? No! Very likely you’re not Facebook. Moreover, I only used 1 project stored in Mercurial in my life (I’m not trying to argue that there are more).

Still, I like such articles on the topic of “tech history”. I think they help us to better understand why we are where we are and how did we get here.

#git #hg #facebook #history

CatOps

14 Jul 2024 12:15

The second practical part of the Helm charts testing article.

- Read in the blog
- Read on Substack

#kubernetes #helm #testing

CatOps

11 Jul 2024 15:52

How Wise reduced AWS RDS maintenance downtimes from 10 minutes to 100 milliseconds is an interesting story for those who do DB operations.

From time to time, it's necessary to apply changes that require downtime. However, it's unacceptable to have long "maintenance windows" nowadays. So, one has to be creative.

#dba #mariadb

CatOps

07 Jul 2024 17:30

A new issue of the CatOps Digest is here!

https://newsletter.catops.dev/p/catops-digest-2024-07-07

#newsletter #digest

CatOps

03 Jul 2024 11:08

In case you missed it somehow.

regreSSHion: Remote Unauthenticated Code Execution Vulnerability in OpenSSH server

A newly discovered vulnerability allows a malicious actor to execute code remotely with the highest privileges on a host. CVE assigned to this vulnerability is CVE-2024-6387.

Glibc-based Linux systems are affescted.

Affected OpenSSH versions:

- OpenSSH versions earlier than 4.4p1 are vulnerable to this signal handler race condition unless they are patched for CVE-2006-5051 and
CVE-2008-4109.
- Versions from 4.4p1 up to, but not including, 8.5p1 are not vulnerable due to a transformative patch for CVE-2006-5051, which made a
previously unsafe function secure.
- The vulnerability resurfaces in versions from 8.5p1 up to, but not including, 9.8p1 due to the accidental removal of a critical component
in a function.

OpenBSD systems are unaffected by this bug, as OpenBSD developed a secure mechanism in 2001 that prevents this vulnerability.

Here's another interesting fact: "In our security analysis, we identified that this vulnerability is a regression of the previously patched vulnerability CVE-2006-5051, which was reported in 2006."

This is why you always need to have several lines of defense in your systems. Also, since I got into the industry, it was always advised not to open SSH to the world and hide it behind a VPN or such. This advice still stands. Moreover, today you have solutions in place that allow you avoiding SSH at all.

#security #ssh

CatOps

01 Jul 2024 10:59

​​​​Sup!

Together with UkrOps Digest we are raising funds for the UAV equipment for the Skelyar platoon of the Rubizh brigade.

Specifically, we are raising money for:

- Antenas
- Batteries
- Controller unit
- 2 sets of cables

The end goal is 150k UAH.

There is also a raffle:

1. Our defenders will sign two platoon banners. Each 300 UAH donation is a chance to win one. So, if you donate 300UAH, you get one "ticket", 600 UAH - 2 "tickets", and so on.
2. Those with top 5 highest donations will have a chance to write a message on a drone!

Vsevolod Polyakov - the author of UkrOps Digest - knows these guys personally, thus I can vouch for them as well.

🎯Goal: 150 000.00 ₴

🔗Monobank Jar
https://send.monobank.ua/jar/6k2H9iu8tN

💳 Direct card number

5375411219683781

Many thanks to y'all!

#donations#Ukraine

CatOps

27 Jun 2024 11:37

The upcoming systemd 256 release will have a replacement for sudo - run0.

You can read more about run0 in this article.

#linux

CatOps

24 Jun 2024 14:03

For today’s Donations Monday, I want to share with you a fundraiser from the Come Back Alive foundation “The second line of air defense”.

#donations #Ukraine

CatOps

20 Jun 2024 13:18

An article called Maybe you need Kubernetes is surprisingly not about Kubernetes.

Instead, it touches the topic of embracing the complexity of modern tech and, more importantly, how one can only progress by learning complex stuff.

As the author puts it himself:

People don’t like to hear this, but difficulty is a moat. When something gets easy, it gets cheap. If you want to be paid a lot, you need to be really good at something that’s both in-demand and hard. If it were easy, everyone would be doing it.

CatOps

18 Jun 2024 11:20

A new DevOps book bundle on Humble Bundle.

It has some well-known books on Kubernetes, Terraform, Ansible, and other stuff. Also, these are O'Reilly books, which should be good.

#books

CatOps

14 Jun 2024 14:42

There are some articles-cheat sheets that are very useful in certain circumstances.

For example, here's a nice cheat sheet for reassignment of Kafka partitions. As you may know, Kafka doesn't reassign partitions automatically when new brokers are added or removed from a cluster.

Save this one just in case, especially if you have Kafka somewhere.

#kafka #cheatsheet

CatOps

12 Jun 2024 20:44

My talk from DevOps FW Days 2024 about Helm charts testing is available on YouTube now!

All the code that I used for the demo is available on GitHub as well!

The talk is in Ukrainian, but I'll write a blog post in English on this topic soon (tm) - I've just wanted to ensure that the materials are publicly available on the FW Days side, so I don't violate any policies.

#slides #helm #kubernetes

CatOps

10 Jun 2024 11:35

​​Last week it was the 7th (!) time we had the DevOps Days Ukraine conference!

One of the important part of it, apart from presentations and open space discussions, is to raise funds for Ukrainian charities.

We've been working with the UA Responders foundation for a couple of years already, and this time we've been raising funds for a surgical aspirator for Dnipro University Hospital.

We have a €1000 goal and just a couple of hundreds below the target. So, we can easily make it with your support!
#donations#Ukraine

CatOps

07 Jun 2024 18:07

Bees With Machine Guns is a tool to load test web applications.

The main difference from other popular tools like Vegeta is that in this case instead of using a single CLI, the tool creates a "swarm" of micro instances in AWS to emulate a DDoS attack so the load originates from multiple points, not a single one.

#security

CatOps

04 Jun 2024 12:09

​​DevOps Days Ukraine 2024 is starting today!

Meet wonderful people, who will talk you through security and also make sure to check out open space rooms to discuss various topics with your peers!

Just to name a few speakers:

- Nazar Tymoshyk — CERT-UA State Communications Engineer
- Anastasiia Voitova — Head of Security Engineering at Cossack Labs
- Brian Tarbox — Principal Solutions Architect at Caylent
- Rotem Refael — Director of Engineering and open-source ARMO
- And many more!

Check out the agenda & register for free 👉 https://www.devopsdays.com.ua

#event

CatOps

15 Jul 2024 14:32

The fundraiser by UkrOps continues. It has slowed down a bit, so let’s keep it running strong!

Convert your rage into donations.

These funds will be spent on the equipment for UAV.

🎯Goal: 150 000.00 ₴

🔗Monobank Jar
https://send.monobank.ua/jar/6k2H9iu8tN

💳 Direct card number

5375411219683781

#donations #Ukraine

CatOps

12 Jul 2024 10:54

At last! I converted my talk from FW Days DevOps 2024 into an article in English.

You can find it in my blog or on Substack.

This is the Part I which goes through the ideas behind the testing of Helm charts. But have no fear! I learn on my previous mistakes, so the second part that walks you through the technical aspects of tests is also ready and will be published tomorrow!

Also, you can still watch the video of my talk on the FW Days conference (in Ukrainian). It has basically the same content as the articles.

Enjoy!

#kubernetes #helm #testing

CatOps

08 Jul 2024 17:42

Convert your rage into donations.

Together with UkrOps Digest we are still raising funds for the Skelyar platoon. These funds will be spent on the equipment for UAV. Right now, we have 1/3 or the required sum.

🎯Goal: 150 000.00 ₴

🔗Monobank Jar
https://send.monobank.ua/jar/6k2H9iu8tN

💳 Direct card number

5375411219683781

#donations #Ukraine

CatOps

05 Jul 2024 13:05

Today's Friday, so we can talk about some more relaxed topics.

Your Company's Problem is Hiding in Plain Sight - High Work-In-Progress (WIP) is a good reminder that working on everything everywhere all-at-once is a bad idea. I'd like to bring up this topic, because I think this issue is even more prevalent in platform teams.

What I missed in this article is some advices on how to address the issue in a controlled fashion: how to properly calculate it and "sell" to the management. Still, you can get some ideas from the discussion on Reddit.

So, as a bonus, I'd also like to share these two articles:

- One is on the Little's Law
- The second one is on the cost of context switching

P.S. I'm in that age when I really regret slacking out at the Queuing Theory lectures in the university :\

#culture

CatOps

02 Jul 2024 17:45

A reasonable article on how to provide meaningful feedback. Specifically, on how not to be afraid to provide meaningful feedback.

You may already know many of these points, but it won't hurt to re-read them. Also, this is one of the cases where actual practice weights more than theory.

P.S. The original article seems to be behind a paywall, but I was able to read it just fine via Pocket. In any case, here are the tl;dr points provided by the author himself:

Way before giving feedback…

- Build a relationship with the other person - This starts the path of giving feedback to someone like it’s your close friend. Good relationship = easy feedback.
- Share that you are open to receiving feedback - This results in the other person seeing you are growth-minded and often leads to them asking for feedback too.
- Give positive feedback first - This helps build a positive relationship and ensures the other person knows you are on their side and looking out for them.

When you do need to give feedback, follow the feedback process…

- Look inward first. Know your intent - Ensure you are sharing the feedback for the right reason. Not to vent, but to help the other person.
- Get permission - When in doubt, confirm with the other person. This allows them to opt in and prevents backlash.
- Show you care - The most important step. Let them know the reason you are sharing is because you care.
- State your observations - Stick to the facts of the situation. These should hardly be debatable. Call out the common problem.
- Explain the impact - Help the other person understand why it matters. Is it impacting you, others, or the business?
- Get their thoughts - You’re solving a problem together. Get their take on it.
- Align on next steps - Ensure it’s clear what to do moving forward.

#culture #feedback

CatOps

28 Jun 2024 12:08

Ruby was the first programming language I tried to consciously learn. Meaning, it wasn't a part of a university curriculum or something.

Despite not using it for many years, I still have some warm feelings towards this language. In this article Lucas Seiki Oshiro argues that Ruby is good for shell scripts as well.

Ruby is strongly associated with the Rails framework. So, I think this article is a good reminder that programming languages are more than just frameworks.

#programming #ruby

CatOps

25 Jun 2024 11:27

Programming skills are essential for work in tech. So, here is a book bundle by Pearson with some books that may help you with those skills.

#books #programming

CatOps

23 Jun 2024 23:01

A late night CatOps Digest is here!

https://newsletter.catops.dev/p/catops-digest-2024-06-23

#newsletter #digest

CatOps

19 Jun 2024 14:32

​​As Charity Majors put it: "Nines do not matter if your users are unhappy". At the same time, nines do not matter if your users do not care.

This small article is a friendly reminder about the cost of adding nines to your SLOs.

P.S. There are some other interesting articles in that blog, BTW.

#slo

CatOps

17 Jun 2024 18:26

For today's Donations Monday, I would like to share with you a fundraiser by Come Back Alive and PrivatBank for the establishment of the "Yatagan" UAV school.

The goal is to raise 33M UAH and currently about 21.5M are raised. It's also possible to donate using a European bank card - I've just checked that ;)

#donations #Ukraine

CatOps

13 Jun 2024 09:52

More conference videos for you!

As you sure know, if you're following this channel, we had a DevOps Days Ukraine conference recently.

Talks are already available on YouTube! Enjoy!

#slides #conference

CatOps

11 Jun 2024 10:17

A new late issue of the CatOps Newsletter is out!

https://newsletter.catops.dev/p/catops-digest-2024-06-09

I'll try to get back to the bi-weekly schedule with newsletters coming on Sundays, but no promises for the Summer.

#digest#newsletter

CatOps

08 Jun 2024 16:38

​​For those of you who like meddling with their terminal emulators - Oh My Posh is a command line prompt that can replace p10k, since the latter one is no longer actively maintained.

Here’s a video where it’s shown in action (and basically this is how I discovered it):

https://youtu.be/9U8LCjuQzdc?si=ho-67Xuht02Ql0kT

What I personally liked from the video is a possibility of creating a neat config in YAML or TOML and ease of replacing current config with another one right in the shell configuration file.

I’ll definitely give it a try when I have some time.

#terminal #tools

CatOps

06 Jun 2024 19:28

A case study from Grammarly on their migration from Graphite to VictoriaMetrics, which helped them to improve DevEx as well as save money.

Unfortunately, there are not many technical details in this article, but I still want to share it, ‘coz I’ve rarely seen posts about VictoriaMetrics in production. So, maybe you are the one who can write something on the matter?

P.S. Do you, folks, even remember Graphite?

#observability

CatOps

03 Jun 2024 13:49

Together with GeekOps and Brokee we are starting a fundraiser for reconnaissance units that work on the Sumy direction.

We are raising funds for Starlinks and electronic warfare equipment for communication and protection against enemy's drones.

The goal is: 95 000 UAH.

You can donate on the Monobank Jar:
https://send.monobank.ua/jar/3D2HEywrZ5

Or to the card directly:

4149 4998 0815 3090


Crypto wallets are also available:
USDT trc 20: TCGcEu5eUWFN8niDvrVUSPPtLWosKj61Gu
USDT erc 20: 0x9e7f1d08f71f0d228c6f7f14e1b0192ec964566b
BTC: 3NktSaKQB8Wwv4txaZTKeZ3EUQs5y9dJ2U

#donations #Ukraine