CatOps Digest 2025-06-01

Jun 01, 2025

It was a CatOps birthday this week! The channel has turned 8 years old 🎉
For this occasion, we have opened a support-jar for Hospitallers!
A fundraiser to buy a truck trailer for an UAV unit.

Digest

Rate Limiting in 1 diagram and 252 words - a short explainer of how rate limiting works with the list of some commonly used algorithms.
Researchers Expose New Intel CPU Flaws Enabling Memory Leaks and Spectre v2 Attacks - the Spectre vulnerability for CPU is back. This time, an attacker can use eBPF to leak secrets.
How PostgreSQL Works: Internal Architecture Explained - another explainer. This time about PostgreSQL. Apart from some minor nitpicks, this is a very good article to get a glimpse of how PostgreSQL works.
On Describing Not Explaining - a real-life example of how to reason about incidents not by trying to guess, what could cause it, but by reasoning of what has actually happened.
Kubeshark - a network analysis tool for Kubernetes.
Ksniff - a Kubectl plugin to capture traffic.
Hubble - an observability tool for Cilium.
Capturing Network Traffic from a Kubernetes Pod with Ephemeral Debug Containers - how to run tcpdump in a debug container.
How to TCPdump in Kubernetes - a hands-on lab regarding the topic above.

That’s all for now. This has been a short digest, but at least it came out after two weeks, and not a month.