Better Dev Link

Over the years of troubleshooting performance problems in the Unix/Linux world, I have seen multiple cases where a regularly used command line tool in a customer server just stops working for some reason. The tool just returns immediately, doing absolutely nothing. No output printed, no coredumps and the exit code is zero (success!). This article walks you through a couple of such incidents and in the end I explain how I avoid accidentally doing bad stuff in production in general

Have you ever try to undo some code typing, then want to undo…the undos to revert it back and realize you cannot do that. How can we build an undo system that allow us to go back to any previous buffer. It’s being used in Emacs and a bit Lisp heavy but I think it’s useful for even non-Emacs user to know about that kind of data structure

Slack strategy to migrate from HaProxy to Envoy for their websocket service. They use weighted routing to shift traffic HAProxy to Envoy. After a very long and exciting 6 months, the migration was complete and the entire HAProxy websocket stack was replaced with Envoy Proxy globally with zero customer impact.

I always said, nothing beats hand-on experience. And when a company shares that with us, by all mean, get on it. Here, Flant shares with us 6 recent cases on how they were troubleshooting their app. Do not forgot to check part 2 and part3

When you are here, make sure to check Tuning Your Postgres Database for High Write Load

Look into lower layer of what exactly happen when MySQL backup data with binlog and use this binglog for replication

In their words: we try, as much as possible, to not use queues or threading at all. I can’t emphasize this enough: the best way to handle concurrency is just to not do it.

How can we know if an user use a VPN or Proxy to access our site? The hypothesis is that different operating systems (and different minor versions among those operating systems) use different default values in their initial TCP SYN packet that initiates the TCP three-way handshake. An interesting technique and a great read that dive into network knowledge and some Python code :-)

A collections of resources to learn Deep Learning in the form of Modules available through the sidebar on the left. As a student, you can walk through the modules at your own pace and interact with others thanks to the associated digital platforms.