A great article about Kubernetes routing.

Yes, things described at the beginning are basic, but then the article explains, how things work under the hood using IPTABLES as an example. So, this article is great both for those who just learn K8s, and those who work with it, but want to dig deeper.

BTW, do you remember all the chains that IPTABLES have? :D

#kubernetes #networking

Who said that there’s no development in the configuration management field :D

Mantis is a new tool to manage you infrastructure (and Kubernetes resources are in the roadmap). It uses Cue lang for configuration.

It’s not production ready! Even according to the author. I just want to share it as an example of:
- Cfg Mgmt development
- The fact that people are still trying to find a middle ground between DSL and Turing-complete languages

#cfg_mgmt

If you want to improve your CLI & scripting game, make sure to check out this book bundle by O’Reilly!

#books

A story of debugging OOMs of a Go application in Kubernetes.

Now, I do not agree with the author of this article that the fact that Go is not aware of memory limits is a problem. In my opinion, it works as expected: you don’t want to have environment-dependent runtimes.

However, this article provides some examples of how one can manage Go’s memory utilization and tune garbage collection a little bit. Plus, it has links to articles that describe Go’s garbage collector in more detail, which is also cool.

#go #programming #kubernetes

8 ways to speed up your Ansible playbooks is a neat article with some simple tips and tricks for your Ansible operations.

Sure, configuration management is not such a hot topic as it used to be, but it’s still out there and it’s still relevant.

#ansible #cfgmgmt

A new newsletter issue is here!

https://newsletter.catops.dev/p/catops-digest-2024-11-03

#newsletter #digest

​​For today's Donations Monday I want to share with you a fundraiser for 1000 FPV-drones from our friends at DOU:

https://dou.ua/forums/topic/50669/

The page has all the information. Also, they have a raffle there. The information is in Ukrainian. So, here's also a direct link to their Monobank Jar:

https://send.monobank.ua/jar/22kincSfqv

#donations #Ukraine

A hot take was shared in our chat yesterday: Gitpod wrote an article on why they moved away from Kubernetes.

While the title sounds clickbaity, this is actually a good article that explains technical considerations for a very particular use case. It also has links to some Kubernetes' functionality that you may find useful for your workloads, such as dynamic resource allocation.

Where did they migrate, you may ask? Well, I can spoil the article for you a little bit: they have built their own orchestrator. Now, do I think this is a good solution? In their very specific use case, it may be. Is it a good solution in general? In my opinion, hell no!

P.S. I'd like to invite Gitpod folks to the FOSDEM conference. For example, in 2023 there was a talk on how to checkpoint and restore your containers in Kubernetes. According to their article, this feature, or rather a lack of it, was a major pain for them.

#kubernetes

KiND is a popular tool for local development in Kubernetes. But what if the thing you're developing is not published anywhere yet?

Sure, you can use tools like Tilt or Skaffold, but they add additional knowledge overhead.

However, you can also load a Docker image into a KiND node. Of course, this won't be such a streamline developer experience as with the tools mentioned above, but it will make the job done with very little additional configuration.

#kubernetes

If you work with NodeJS on backend, this article may be useful to you.

This one is about how to increase (or decrease) memory limit for NodeJS when working with PM2.

#programming #nodejs

In his last interview for Deutsche Welle, Taras Chmut - the head of Come Back Alive foundation - described that it's much harder to raise funds for projects that are focused on trainings and other strategic initiatives that may not result in the "direct hits" on the battlefield.

That's why today I'd like to share a fundraiser for the Captain's Trainig program by Come Back Alive.

#donations #Ukraine

25 years of Google data-center networking evolution is a sneak peek into Google's internal network, phases of its evolution through the company's history, as well as technologies that allow them to handle up to 13 Petabits/sec of bisectional bandwidth.

I especially liked this quote:

 network is the foundation of reliability for all other compute services, from storage to AI. As such, the network must fail last and fail least.

#networking

A brief overview of how to choose the right size for your RDS instance in AWS.

Although, I would argue that certain workloads would already experience problems at 80%+ CPU load on CPU. So, sometimes it doesn't make sense to wait the whole four-week evaluation period.

Also, make sure to keep track of your reserved instances: you don't want to pay more than you should when jumping between instance types!

#aws #databases

You have a Database that can be affected by Disk corruption, and you have millions of transactions? Well, good for you that nothing bad happens yet.

But what if I say that there is better solution, x1000 faster and safer? Just send 0.1BTC called TigerBeettle.

Also, it has of the best presentation what I ever saw. Check it

Testing simulation showed at the end, if you want to try yourself - sim.tigerbeetle.com

#databases

You have likely seen this already, but still.

Prometheus 3.0 is available!.

Notable changes (as listed in their release page):

- New UI
- Remote Write 2.0
- Native histograms
- Improved UTF-8 and OTLP (OTel Protocol l)support
- Better performance

#observability #prometheus

A new fundraiser for the International Legion, where my friend's brother serves.

https://send.monobank.ua/jar/7wNX44oe8W

This is a fundraiser for ongoing expenses such as car repairs and Starlink fees. The goal is 80k UAH and about a half is achieved already.

#donations #Ukraine

An article and a CNCF NA talk about Atlas - a tool to manage database migrations, and specifically about the Atlas Operator - a way of managing database state in Kubernetes. It's important to point out, that the database itself doesn't have to reside in Kubernetes.

Except some advertisement for Atlas, this article actually points out problems of executing migrations that are not limited to K8s. Still, even though this is an article about a tool from a creator of the tool, I think both blogpost and the tool itself are interesting.

But to be completely fair, there's also the SchemaHero tool - a truly open source one.

#databases #kubernetes

Where you good at math in school?

Humble Bundle sales a collection of Math for Programmers books. One of the books is from the “Grokking” series. I’ve heard that series is a good one.

Also, one of the books is written by a Ukrainian author. You can read an interview with him on DOU (in Ukrainian).

#books

Thoughtworks have published their usual TechRadar. You can also get the full PDF report there there.

This tech radar provides some valuable insights into the industry. Besides, this is already the 31st volume, so you can compare it with previous versions. Just keep in mind that this tech radar (as any other) is biased, because it basically represents the Thoughtworks' customer base, thus it's not universal.

#tech_radar

A nice overview of the evolution of Bluesky by Gergely Orosz and Elin Nilsson.

Bluesky is a decentralized social network which was born as an alternative to Twitter. It’s super interesting that for almost half a year Bluesky only had 2 engineers and even today the team behind the whole platform is rather small.

It’s also interesting that infrastructure wise they have started with AWS and Pulumi and eventually moved to their own equipment for cost savings.

#architecture

A new issue of the CatOps Digest is available!

https://newsletter.catops.dev/p/catops-digest-2024-11-24

#digest #newsletter