Alex Brown @lextech devisnotnull

The introduction to Reactive Programming you've been missing

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

Opening and closing an SSH tunnel in a shell script the smart way

I recently had the following problem:

From an unattended shell script (called by Jenkins), run a command-line tool that accesses the MySQL database on another host.
That tool doesn't know that the database is on another host, plus the MySQL port on that host is firewalled and not accessible from other machines.

We didn't want to open the MySQL port to the network, but it's possible to SSH from the Jenkins machine to the MySQL machine. So, basically you would do something like

ssh -L 3306:localhost:3306 remotehost

Multiple SSH Keys settings for different github account

create different public key

create different ssh key according the article Mac Set-Up Git

$ ssh-keygen -t rsa -C "your_email@youremail.com"

Multiple SSH Keys settings for different github account

create different public key

create different ssh key according the article Mac Set-Up Git

$ ssh-keygen -t rsa -C "your_email@youremail.com"

Cloud images in Proxmox

A script which automates these steps for multiple distros incl. CoreOS, CentOS, Arch and ALpine

create-cloud-template.sh

Steps for creating an Ubuntu 18.04 cloud template

Using a ready-to-use Ubuntu image

Kubernetes cheatsheet

Kubernetes cheatsheet
Everything is an object - persistent entities

	# /etc/network/interfaces
	#
	auto lo
	iface lo inet loopback

	# device: eth0
	iface eth0 inet manual

	# IPv4 bridge
	# (connect ONLY your firewall/router KVM instance here, this is the WAN device!)

	upstream tunnel {
	server 127.0.0.1:3000;
	}

	server {
	listen 80;
	server_name dev.codeplane.com br.dev.codeplane.com;

	location / {
	proxy_set_header X-Real-IP $remote_addr;