In this blog post, we will explore, how to get started with Docker Cloud, a Docker orchestration cloud service that helps deploying and managing Docker hosts clusters and Docker containers running on those host clusters. Background Since Docker has acquired Tutum…
Running GUI apps with Docker for remote Access
In this blog post, we will explore how to start and access a Linux Docker image with a graphical desktop and access it remotely using VNC. In the course of the blog post, we will search for an appropriate Docker…
AWS Automation based on Vagrant — Part 3: Creating a Docker Host on AWS in 10 Minutes using Vagrant
Learn how Vagrant can be used to perform more sophisticated provisioning tasks than creation and termination of virtual machines. From our local Vagrant console, we will install Docker host Software and we will verify the results by downloading and testing the Python Docker image.
AWS Automation based on Vagrant — Part 1: Getting started with AWS
In this blog post series we will explore, how to automate Amazon Web Services (AWS) by using Vagrant. The series is divided into three parts. Readers that are interested in the automation part only can skip part 1 (the AWS…
AWS Automation based on Vagrant — Part 2: Installation and Usage of the Vagrant AWS Plugin
Learn how to get started with Amazon Web Services EC2 and how to automate simple task like creation and termination of virtual machine instances using Vagrant. This is a first step towards more sophisticated automation tasks like SW installation and shell script execution.
Automating Network Provisioning with Cisco APIC — Exploring the REST API
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)…
Choosing the right IaaS Provider for a custom Appliance or: how hard is it to install from ISO in the cloud?
Which Cloud Infrastructure provider allows to install custom appliances via ISO? The short answer is: none of the IaaS market leaders Amazon Web Serviese (AWS), Microsoft Azure offer the requested functionality, but they offer the workaround to locally install the…
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…
CCIE Written HowTo — where to get the Questions from (also for MCSE and others)
Every two years, I need to re-certify for the Cisco Certified Internetworking Expert certification (CCIE). This time I intend to post my findings on this blog. I intend to describe where to get Example Questions from and how to read them (works for…
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.…
Docker Java Performance Tests
In this blog we will show the surprising result that Docker on Ubuntu seems to outperform Docker on CoreOS by ~30%, when tested with a java templating web service. But first let us discuss the reason on why I have started the…
Java Build Automation Part 1: Create lean executable jar using Maven
Have you ever tried to create an executable jar file, while keeping all configuration files outside of the jar file, accessible to operations folks? Here is a step by step guide. JAR files are java archive files and as such, are not…
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…
What is Docker? An Introduction into Container Technology.
Short Introduction into container technologies and reasons, why I have chosen to start proof of concepts with Docker and no other container technology.
Docker Performance Tests for Ruby on Rails
In a series of performance tests, we could show that a (Rails) web application has 50% higher performance on docker (installed on Windows/boot2docker) than the same application run natively on Windows, no matter whether or not the database and program code is located on a shared volume. However, if such a shared volume is auto-mounted to one of the Windows C:\Users folders, the performance drops by a factor of almost ten.
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…
