CatOps

Fluent Bit 2.0.0 with support for traces is released!

It means that now Fluent Bit fully integrates with systems like Prometheus and OpenTelemetry natively.

#observability

A new OPS-ish books collection from Humble Bundle - Linux and Sysadmin Tools.

As usual, you can pay a little bit more than €17 to unlock the whole bundle of 15 books.

Speaking of the books I can see there, I’ve heard that “Linux Pocket Guide” by Daniel J. Barrett is a good entry level book. Also, I’ve heard that “Linux System Programming” by Robert Live is good, although a little bit too specific. I’m personally interested in the AWK book the most. I use it in my day-to-day work quite frequently and I feel like I still too far away from its true potential.

#books

Sup! I'm back from vacationing.

First, I wanted to share something serious and fundamental-ish as the first post of the year. Unfortunately, I haven't read anything worthful yet :\

So, I want to share an episode from the ShipIT podcast, which is called "Fundametals". It was published a while ago, but I listened to it just recently.

I think it fits perfectly my idea to start this year on CatOps with something more interesting than just a link to a tool, etc. Enjoy!

BTW, this episode is also available on the major streaming platforms (I listened to it on Spotify). I won't provide the links, though, because I don't know which platform do you use. Also, their website has a transcript. So, if you prefer reading to listening, it's possible as well.

#podcast

​​З Новим Роком, коти!

Happy New Year!

cURL is going to support an output of server certificates in PEM format using -w (write-out) options.

Support for these new -w variables has been merged into curl’s master branch and is scheduled to be part of the coming release of curl version 7.88.0 on February 15th, 2023.

A nice overview of how Docker works on non-Linux hosts as well as an explanation, why I/O operations are so slow. Plus, some hints on how to make it faster for the local development.

tl;dr. Because Docker requires Linux capabilities, thus is has to have Linux VM to run Linux-based images on MacOS and Windows. This VM shares filesystem with the host, which is slow. There’s a new implementation VirtioFS, which is faster, but still not ideal.

We briefly discussed ways of running Docker on the new M-based Macs on our previous voice chat and this article has links to some tools we mentioned there, specifically: Rancher Desktop and Colima.

Also, I recall developers at my previous job complaining about slow-ish Docker performance, but IIRC VirtioFS was not widely adopted back then.

#docker #linux

I like graphical representations of complex systems.

So, here you are: a zine-like scheme of the RAFT consensus algorithm

#raft #zine

Monokle CLI is yet another tool to validate cnfiguration for the objects in your
Kubernetes clusters. It's a part of a bigger Monokle project and can be used as a CLI and integrated into your CI/CD pipeline.

For now it can validate:
- YAML syntax
- The schemas of your YAMLs against a configurable K8s version
- Links/references between Kubernetes resources
- A set of predefined OpenPolicyAgent (OPA) policies
- Custom rules written in typescript

Also, it looks like there's an active development around this tool at the moment. So, let's see, how it goes.

#kubernetes

Disk encryption in AWS is close to useless and potentially harmful.

No, it’s not like AWS is going to do anything with your data.

tl;dr: Encryption at rest protects you from cases when someone steals your disk. However, such an attack vector is so hard in a cloud environment that it’s completely worthless for an attacker.

However, the correct implementation of the encryption at rest will take time and effort that you can put into real risk mitigation and security hardening instead.

#security #aws

The new issue of the CatOps Digest came a little bit later, but it’s here now 🎉

#newsletter

Last week we recorded one of our usual voice chats as a test. So, more people who were unable to join because of blackouts could listen to it.

Moreover, the topic of our voice chats was: “How to work without electricity, Internet access, and utilities”.

Although, we have touched other topics as well, as it usually happens:
- Starlinks and external antennas
- M1/2 MacBooks
- Ancient communication technologies

The recording is in Ukrainian and available on:
- YouTube as a static image
- Spotify
- Apple Podcasts
- Google Podcasts
- Anchor

Enjoy!

#voice #говорилка

An “Awesome SLOs” list.

Books, articles, videos, and more.

Also, it’s open source, so feel free to contribute!

#slo #observability

A quite old article on debugging a NodeJS AWS Lambda function.

Yet, I still want to share this one, because even if you don‘t have NodeJS functions specifically, the article has some insights on how to debug Lambda functions in general.

Also, there some take away points that would be relevant for any HTTP workload, not just JS.

#aws #serverless

CatOps pinned «Here’s an article on Currying in Go. Currying is a technique borrowed from the functional programming. It’s essentially a partial implementation of a function. Anyways, I find such articles interesting, because they show some unconventional angles of a language.…»

Here’s an article on Currying in Go. Currying is a technique borrowed from the functional programming. It’s essentially a partial implementation of a function.

Anyways, I find such articles interesting, because they show some unconventional angles of a language. I haven’t personally used currying in Go yet. However, examples in that article look reasonable. Maybe, one I day I will try it.

I’m not saying that you should use this technique in your code, but maybe you find it useful. In the latter case, you’re welcome!

#go #programming

​​Not a technical post.

Today is the Volunteer Day. I want to dedicate this post to all the people who help daily our military forces as well as civilians.

Thank you for your work and dedication!

Now, I add a Linktree to each post that contains links to various volunteer organizations as well as other useful things. Today I want to share individuals and foundations I regularly support personally.

- Pavlo Bondarenko and Naya are collecting funds for recon drones and Starlinks for AFU. The both have PayPal, so it’s easy to send money from outside Ukraine. Pavlo is a friend of mine, we’ve been to Sziget Festival together a couple of times. Before the full scale invasion he was running a Ukrainian podcast production “Radio Podil”.
Pavlo’s links
Naya’s links

- UA Responders a foundation specialized on tactical medicine and other medical things. I know them, because my wife is actively helping there and my classmate helps them with logistics. They have Polish IBAN, so it’s handy to send money from within the EU. Obviously, they have other ways to accept donations as well.

- Come Back Alive. I mean, they do not require an introduction. This is the most famous and probably the oldest volunteer organization in Ukraine that helps UA military. Also, now they have a convenient web form to accept donations right in their website.

(image via @lachentyt)

#volunteers #Ukraine

I try to be consistent with the digest even when I just want to lay on on a couch and watch some YouTube.

A new issue of the CatOps Digest is out!

#newsletter

Here the FireHydrant company writes that MTTR (mean time to recovery) metric is overrated.

I tend to agree with their justification: not all incidents are the same. Not all systems are equally critical as well as not always the cause or rather a set of causes is easy to mitigate.

However, it’s still important to measure the quality of your incident response somehow. The propose two metrics instead:

- Mean time to detection - basically, how long it takes for you to spot a problem. I would also ask an additional question here: was a problem reported by your observability systems, or by your colleagues or customers?

- Mean time to retrospective - or mean time to postmortem if you wish. I think this is a good one. It’s true that some details may fade away from memory, so sooner you do a retrospective - the better! Also, it’s f you actually measure this time, it can help you to prioritize meetings and put postmortems as a higher priority comparing to, for example, a team standup.

#observability

Kubeshark is an traffic viewer for Kubernetes providing deep visibility into all API traffic and payloads going in, out and across containers and pods inside a Kubernetes cluster.

I don’t have much to add here. This is basically a Wireshark for Kubernetes. So, if you probably know it if you need something like this. Otherwise, I would say that one can live Ok without it. Yet, if you ever need to analyze, what’s going on with requests in your cluster, you can always use this tool!

#kubernetes #networking

I remember people creating NAT instances in AWS because NAT Gateway was not available at a time.

Now, some claim that NAT Gateway is too expensive, thus nat instances is the way.

The circle is complete, I guess.

Anyways, here’s alterNAT - self provisioned NAT instances in AWS.

To be completely honest, there are use cases for NAT instances indeed and they do not claim that this solution is for everyone.

#aws #networking