This is a simple post showing a basic configuration for setting up OpenVPN server accepting multiple clients with TLS. First of all generate self-signed server and client private key and certificates, and dh params. Make sure to write the Organization Name AND Common Name (CN) when asked, otherwise openvpn will fail to verify the certificates. openssl req -newkey rsa:2048 -nodes -keyout serverkey.pem -x509 -days 365000 -out servercert.pem openssl req -newkey rsa:2048 -nodes -keyout clientkey.

Let’s talk about Docker and Nix today. Before explaining what Nix is, if you don’t know yet, and before going into the details, I will show you a snippet similar to a Dockerfile for creating a Redis image equivalent to the one in docker hub. The final image will be around 42mb (or 25mb) in size, compared to 177mb. EDIT: as mentioned on HN, alpine-based images can even go around 15mb in size.

TypeScript is a typed superset of JavaScript that compiles to plain JavaScript, the way you expect it to be. I’ve heard of it a long time ago, but recently with TypeScript 1.7 it got async functions, which means you can awaitasynchronous function calls, similarly to C#, Vala, Go and other languages with syntax support for concurrency. That makes coroutines a pleasant experience compared to plain JavaScript. That’s also the main reason why I didn’t choose Dart.