It turns out that there’s quite a bunch of people who bumped into a particular Nginx upstream handling behavior. Not that long ago I also joined the club. It usually manifests as unavailability of some service behind Nginx as a reverse proxy. Clients start to get “502 Bad Gateway” after some change in the service…
Tribute to the Blog of Uwe Friedrichsen
At the end of November last year I bumped into a blog which immediately captured my attention. I eagerly read during a few weeks after as the blog turned out to be a treasury of value =) Articles are nicely interconnected with each other, so it’s easy to fall into a rabbithole of great content…
How to manage CPU in Kubernetes and keep your foot safe
In today’s complex cloud-native landscapes, Kubernetes (aka k8s) stands as a pivotal technology that simplifies the management and orchestration of containerized applications. However, as developers and operators dive deeper into Kubernetes, it’s essential to understand how resource management within K8s operates, particularly regarding CPU requests and limits. This article aims to shed light on Kubernetes,…
Modern Email Essentials: DKIM, SPF, DMARC
It’s interesting to see how technology adoption cycles are repeating themselves for different technologies. One of such observations is how regular phone calls get through a security hardening similar to what email already got through. And the reason is exactly the same – spam. These days a lot of people employ some kind of calls…
Signs of memory pressure in Linux
The question of “is my Linux system has enough memory?” sounds easy on the surface. It’s surprisingly cumbersome to answer when you dig deeper. Yup, free -m is not even a half of the story and there are all kinds of signs of memory pressure in Linux. First of all there’s vm.overcommit_memory kernel setting which…
Practical Problem Solving Meta-approaches: Part #3
This article is a part of series This article wraps up meta-approaches for practical problem solving. For a recap: meta-approach is an effective problem solving technique which I managed to capture over time as it manifests itself in work & life. We’re going to look into another triplet for this one. Root cause analysis (RCA)…
Problem Solving Techniques – Meta-approaches: Part #2
This article is a part of series Today more on practical meta-approaches: effective problem solving techniques which I managed to capture over time as they manifest themselves in work & life. Root cause analysis (RCA) via deep dive aka 5 whys You ran into a problem: something goes sideways. More formally some process metrics are…
Effective Problem Solving Meta-approaches: Part #1
This article is a part of series This blog post starts a series of articles on practical meta-approaches. These are effective problem solving techniques which I managed to capture over time as they manifest themselves in work & life. Interval forecasts: worst/best case You have to forecast some metric. Forecasts are hard as it’s fundamentally…
Business vs Technology Founders: Why Balance is Key
From life experience in general I grow more & more to believe that balance is key. Similarly when it comes to software development a proper balance of business vs technology founders is important. I’d say it’s among the most critical indicators of whether the whole enterprise will be successful or will get derailed eventually. Let’s…
Node.js: is frontend or backend?
I’ve recently noticed a bit of popularity of the question from the subject – “Node.js: is frontend or backend?”. That made me think about what is obvious for someone may be not that obvious for someone else. The question is probably coming from people beginning their journey in computer science (CS) space. And most of…