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BlogRolling upgrade of Docker applications using CoreOS and Consul In the previous blog post we showed you how to setup a High Available Docker Container Application platform using CoreOS and Consul. In this short blog post, we will show you how easy it is to perform a rolling upgrade of a deployed application. (Updated – june 2nd 2015 – removed consul-http-loadbalancer-lb from the Vagrant archite

BlogA High Available Docker Container Platform using CoreOS and Consul Docker containers are hot, but containers in themselves are not very interesting. It needs an eco-system to make it into  24×7 production deployments. Just handing your container names to operations, does not cut it. In the blog post, we will show you how  CoreOS can be used to provide a High Available Docker Container Platform

When you are playing around with Docker, you quickly notice that you are downloading large numbers of megabytes as you use preconfigured containers. A simple Ubuntu container easily exceeds 200MB and as software is installed on top of it, the size increases. In some use cases, you do not need everything that comes with Ubuntu. For example, if you want to run a simple web server, written in Go, the

In this tutorial we are going to create a PageRanking for Wikipedia with the use of Hadoop. This was a good hands-on excercise to get started with Hadoop. The page ranking is not a new thing, but a suitable usecase and way cooler than a word counter! The Wikipedia (en) has 3.7M articles at the moment and is still growing. Each article has many links to other articles. With those incomming and outg

The traditional way to deal with asynchronous tasks in Javascript are callbacks; call a method, give it a function reference to execute once that method is done. $.get('api/gizmo/42', function(gizmo) { console.log(gizmo); // or whatever }); This is pretty neat, but, it has some drawbacks; for one, combining or chaining multiple asynchronous processes is tricky; it either leads to a lot of boilerpl

This blog describes how easy it is to use docker in combination with a Raspberry Pi. Because of docker, deploying software to the Raspberry Pi is a piece of cake. What is a raspberry pi? The Raspberry Pi is a credit-card sized computer that plugs into your TV and a keyboard. It is a capable little computer which can be used in electronics projects and for many things that your desktop PC does, lik

Last time I explained why I think doing TDD for mobile is imperative, and why I do it. But now it’s time to get technical, and explain to you how to set up, GHUnit in XCode 4 and run unit tests, not only in the iPhone and iPad simulator but also on your own physical device!, it’s in text and images but also in video form on YouTube. Note, if you want to know why i chose GHUnit over OCUnit, just sc