CatOps

20 October 2025 11:12

​​Speaking of AWS:

Oct 20 2:01 AM PDT We have identified a potential root cause for error rates for the DynamoDB APIs in the US-EAST-1 Region. Based on our investigation, the issue appears to be related to DNS resolution of the DynamoDB API endpoint in US-EAST-1. We are working on multiple parallel paths to accelerate recovery. This issue also affects other AWS Services in the US-EAST-1 Region. Global services or features that rely on US-EAST-1 endpoints such as IAM updates and DynamoDB Global tables may also be experiencing issues. During this time, customers may be unable to create or update Support Cases. We recommend customers continue to retry any failed requests. We will continue to provide updates as we have more information to share, or by 2:45 AM.

#aws #outage

CatOps

19 October 2025 17:03

Nice weekend read about technical blogging.

https://writethatblog.substack.com/p/thorsten-ball-on-technical-blogging

One of the best ways to learn is to try to explain whatever you have learned to someone else. Blogging is a form of that.

Perhaps, we can dedicate a day to share the blogs we like here on CatOps, let me know, if you think, it’s a good idea.

#culture

CatOps

16 October 2025 17:00

A bundle of Python programming books by Pearson.

While Python won't be my first choice, sometimes it's inevitable. Also, Pearson usually have great books!

#books #programming #humblebundle

CatOps

13 October 2025 11:38

​​It’s Monday, fellas.

A friend of mine is raising money for a Starlink and 3 power stations for the 5th Separate Heavy Mechanized Brigade and 33rd Separate Mechanized Brigade.

You can donate via to this Monobank jar (Apple pay works):

https://send.monobank.ua/jar/3VEQNLAcia

Almost half of the goal is already there.

#donations #Monday

CatOps

09 October 2025 12:09

A small article about goroutines leaks in Go and the ways to detect that.

Another tip is from Dave Cheney himself: never start a goroutine without knowing how it will stop.

#programming #go

CatOps

07 October 2025 16:36

These days, you can use Kubernetes for the same things you used to use OpenStack.

In this short video Volodymyr Tsap - a member of our community - shares a quick demo of their recent project - Kube-DC.

#kubernetes #self_hosted

CatOps

03 October 2025 12:21

An idea worth nothing without the implementation, they say. But what to do, if your ideas are discarded at your company, so you are never given the time and resources for the implementation?

In his article "Quiet Influence: A Guide to Nemawashi in Engineering", one of our subscribers shares an approach of convincing your management of ideas worth trying.

At some point in the career, skills like that are getting more and more important. So, it's very limiting to ignore the people skills for one's progress.

#culture #mgmt

CatOps

01 October 2025 08:46

Is it the first supply chain attack in the MCP world?

A fake Postmark MCP was secretly BCCing all the emails.

Postmark is an SMTP provider. They have already put a statement that it was not developed by them.

The moral of the story is not to blindly trust 3rd party software that doesn’t come from your vendor. Another interesting thing is that the attack itself has nothing to do with LLMs, but the attackers are using the hype around everything AI to embed their malicious code.

#security #ai

CatOps

29 September 2025 12:14

​​A friend of mine helps raising funds for the telecommunication equipment for the 3rd Separate Assault Brigade.

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

This jar works with Apple Pay. I’ve tried it myself (since many Monobank jars do not support Apple Pay for whatever reason).

#donations #Monday

CatOps

26 September 2025 15:49

A new issue of the CatOps Digest is here:

https://newsletter.catops.dev/p/catops-digest-2025-09-26

#digest #newsletter

CatOps

15 September 2025 15:11

​​For today’s Donations Monday, I’d like to remind you once again about the UA Responders foundation that works in the medical and rehabilitation field.

We cooperate with them for the DevOps Days Ukraine conference since the beginning of the full scale invasion.

Here's the direct link to donate:
https://uaresponders.org/donate/

#donations #Ukraine

CatOps

12 September 2025 12:13

They thought the Cloud was easy, predictable and Serverless is a best option... for become a truly horror!

Serverless Horrors is a collection of true thriller stories. Confusing settings, crashes, and unexpected traffic turn serverless accounts into a bloody mess for your wallet. Read on to avoid becoming the hero of the next horror story.

Happy Friday, btw 😈

#serverless

CatOps

09 September 2025 17:53

Learnkube is a great resource, because they explain how Kubernetes works not only within its own abstractions, but in relation to other technologies.

Im this article they explain, how Kubernetes’ Security Context maps to the Linux primitives.

Tires article would be useful even if you’ve worked with both Linux and Kubernetes for some time, since recalling basic things from time to time is important.

#kubernetes #security #linux

CatOps

06 September 2025 13:46

A new CatOps Digest is out:
https://newsletter.catops.dev/p/catops-digest-2025-09-06

These digests are great reminders for me, how little I post to the channel lately 😔

#digest #newsletter

CatOps

01 September 2025 12:07

​​For today's Donations Monday, I'd like to ask you, once again, to help our friends from the UkrOps Club with their fundraiser for the electronic warfare equipment.

https://send.monobank.ua/jar/6tomFnD5Rb

About 50% of their "support jar" is covered.

#donations #Ukraine

CatOps

20 October 2025 11:07

​​Since AWS has an outage, some of you have unplanned time off anyway. So, it's a good time to make a donation to a noble cause!

A friend of mine has a supportive jar for INSCIENCE who partnered with the Come Back Alive foundation to raise money to combat enemy UAVs.

https://send.monobank.ua/jar/fKfgmjgw1

Her goal is 20k UAH, so we can easily achieve it!

P.S. Apparently, Monobank hosts in AWS, since their web paged did not renew once I sent the donation.
P.P.S. Despite N26 also being on AWS, they processed the transaction just fine.

#donations #Ukraine

CatOps

17 October 2025 18:25

A new issue of the CatOps Digest is here!
https://newsletter.catops.dev/p/catops-digest-2025-10-17

One week later than it should have been released, but oh well...

#digest #newsletter

CatOps

14 October 2025 17:57

I like it, when people talk about definitions, especially for some common / widely use terms. The more common a term is, the more one is "afraid" to ask about it. And since we cannot glimpse into other people's minds, we can talk about completely different things using the same words.

Availability Models talks about the definitions of "high availability" - incredibly popular term in computer science! It doesn't examine all the availability models, despite its name. Rather, this article brings up a question: so, what the heck is "high availability" and how can we define that based on our actual needs?

P.S. Also, I didn't know about the PACELC theorem. It always feels so cool to learn something new!

#databases #programming #system_design

CatOps

10 October 2025 18:51

There’s a lot of fluff around about how one should be a technical leader, yet the exact understanding of what is leadership is rather vague.

Here’s a nice Friday read on the topic that resonated with me.

Here’s a great quote:

>>>
The more comfortable you become with not being the expert, the more effective you become as a leader.
When you stop trying to out-expert the experts, you can focus on what expert teams actually need:
- Clear problem definitions
- Context for decision-making
- Translation between different perspectives
- Protection from unnecessary complexity
- Space to do their best work

#culture

CatOps

08 October 2025 13:03

You may have seen this news already, but it's still worth sharing in my opinion.

Terraform adds a new language concept called "actions". It's interesting, because while HCL evolved through time, basic concepts such as resources, data sources, variables, and locals remained the same.

In nutshell, Actions are basically provider-approved local-execs: provider developers can add specific imperative tasks, such as invoking an AWS Lambda, that you can later attach to your resource's lifecycle.

The concept is not new, you were likely already doing this with provisioners, local and remote execs, and other hacks. Now, it's just more universal and straightforward.

The only thing is that actions are up to provider developers to implement, so do not expect many of them available from the get-go.

#terraform #hashicorp

CatOps

06 October 2025 13:37

​​For today’s Donations Monday, I’d like to share with you a standing jar of one of the UAV units in which serves a guy from my wife’s small town.

They use this jar continuously to cover their needs for different equipment such as FPV drones, etc.

https://send.monobank.ua/jar/4WLw91UqFe

Card number:

5375 4112 2187 4204

#donations #Ukraine

CatOps

02 October 2025 12:25

Speaking of MCPs. 2 new MCPs from AWS are available:

- AWS API MCP
- AWS Knowledge MCP

News via AWS Feed

#aws #ai

CatOps

30 September 2025 13:08

A bundle of book bundles!

1. Cybersecurity Month bundle by O’Reilly.
2. Cisco Networking book bundle for certification preparation.

I recall, that having CCNA was a badge of honor when I was a student. I never had one. Mostly, because I was a bad student.

P.S. When dealing with HumbleBundle, always check what books you have already! I think, the Cisco bundle was featured before.

#books #humblebundle

CatOps

28 September 2025 16:23

As you may have already guessed from the newsletter, a recording of my talk alongside the other talks from FW Days DevOps is available now on YouTube.

So, like, subscribe, and so the rest of the YouTube dance for the great FW Days team :)

#slides

CatOps

25 September 2025 11:42

​​I'm back from a brief vacation, hence there was no newsletter last Friday. While, I'm catching up with things, you can help our friends from DOU and complete their survey about Ukrainian companies (in Ukrainian).

https://jobs.dou.ua/questionary/

The next issue of the newsletter comes tomorrow 🤞

CatOps

14 September 2025 11:02

If you don’t like debugging the certificate issues, why not make the machine do it for you?

cert-manager-mcp-server is an MCP server from one of the members of our community.

I guess, we are in our “fuck around” phase with MCP servers and real-world AI applications. So, check it out and see, if it’s helpful!

#mcp #ai

CatOps

10 September 2025 13:21

If you use KEDA in production, make sure you monitor it :)

Here are some useful Grafana dashboards for that.

#observability #grafana #keda #kubernetes

CatOps

08 September 2025 13:45

​​For today's Donations Monday, I'd like to remind you about the UA Responders foundation. They work in the medical and rehabilitation field.

We cooperate with them for the DevOps Days Ukraine conference since the beginning of the full scale invasion.

Here's the direct link to donate:
https://uaresponders.org/donate/

#donations #Ukraine

CatOps

02 September 2025 16:26

Many years in a row we organize the DevOps Days Kyiv conference for you!

This year isn't an exception. Tomorrow at 17:00 Kyiv time (14:00 UTC) we meet online once again online to talk about AI and its role in the software development industry.

We have open space afterward, so it's not a one way road: you'll be able to share your thoughts and experience there as well!

The conference is free, all you need is to register on the website:

https://devopsdays.com.ua/

See you there!

#event #devopsdays

CatOps

28 August 2025 14:42

The deprecation of Bitnami public resources is apparently moved one month ahead.

A bit of a relief for those who haven’t yet migrated, but still.

#bitnami #docker #kubernetes