How to automate the configuration of network devices? Cisco APIC-EM (= Application Policy Infrastructure Controller) is a controller that can help us with that task. In this blog post, we will explore its modern REST API for accomplishing basic tasks like creating, reading, updating and deleting (CRUD)…
Rails Active Admin: from config File to Admin Portal
This blog post is a continuation of part 1 that had focused on the the installation process of Active Admin. In the current post, we show how Active Admin can be used to migrate from a configuration file based approach by an admin portal based…
Rails Active Admin Installation Experiences / HowTo
In this post, I have recorded my experiences with ActiveAdmin, a Rails Engine that has following goals (copied from their readme file): Enable developers to quickly create good-looking administration interfaces. Build a DSL for developers and an interface for businesses. Ensure…
Upgrading Rails to 4.2.x and Ruby to 2.2.x — an end to end Example
In this post, I have recorded my experiences when upgrading my hobby Web Application, a ProvisioningEngine front end from Rails 4.1.x to Rails 4.2.x and ruby from 2.1.x to 2.2.x. The upgrade went relatively smoothly, apart from an additional gem…
Salt Hello World
This a simple Salt Hello World similar to the Ansible Hello World in part 1 of this series. In each step, we will discuss the likeliness and differences between Salt and Ansible. This post is (almost) self-contained, and there is no…
Ansible Templating – A Hello World
This post is a continuation of my previous post, where we have gone through a little "Hello World" example using Ansible, an IT automation tool. Last time we had performed SSH remote shell commands. This time, we will go though a little…
Ansible Hello World – Ansible vs. Salt vs. Chef vs. Puppet
This is part 1 of a little Ansible Hello World example, an IT automation tool. The post has the following content: Comparison of the popularity of Ansible, Salt, Chef, and Puppet Installation of Ansible based on Docker Simple Example Playbooks (i.e.…
Source Code to Docker Image — automated Build
What, if you could release and deploy fully tested and bullet-proof software on a day by day basis? Isn't this a huge effort for hobby developers like me? Even for hobby developers, Docker and its ecosystem promises an easy way to…
Docker CoreOS Cluster in less than 10 Minutes
Install a Docker Cluster in less than 10 Minutes This blog shows, how a Docker CoreOS cluster can be set up in ~10 minutes (dependent on your Internet speed), excluding the time to install Vagrant, Virtualbox and git. In order…
Container Orchestration with Kubernetes
This blog post shows a quick way how to install Kubernetes, a Docker orchestration framework published by Google, as a set of Docker containers. With that you can circumvent the hassle you may run into while trying to install Kubernetes natively.…
