Cassandra “Hello World” Example


    Today, we will introduce Cassandra, a distributed and resilient, highly scalable noSQL database. For simplicity, we will run a cluster it within Docker containers and test the resiliency functions by killing one of two containers and verifying that all data is retained. What is Cassandra? Apache Cassandra is a fast, distributed noSQL database that … More Cassandra “Hello World” Example

Kibana “Hello World” Example – Part 3 of the ELK Stack Series


Today, we will introduce Kibana, a data visualization open source tool. As part of Elastic’s ELK stack (now called Elastic stack), Kibana is often used to visualize logging statistics and for management of the Elastic Stack. However, in this Tutorial, we will analyze statistical data from Twitter by comparing the popularity of Trump vs. Obama vs. … More Kibana “Hello World” Example – Part 3 of the ELK Stack Series

Elasticsearch “Hello World” Example – Part 2 of the ELK Stack Series


In the last blog post, we have explored Logstash, a tool for collecting and transform log data from many different input sources. Today, we will explore Elasticsearch, a scheme-less noSQL database with a versatile (“elastic”) search engine. We will perform a little Elasticsearch “Hello World” by running Elasticsearch in a Docker container and manipulating database entries. After … More Elasticsearch “Hello World” Example – Part 2 of the ELK Stack Series

Logstash “Hello World” Example – Part 1 of the ELK Stack Series


Today, we will first introduce Logstash, an open source project created by Elastic, before we perform a little Logstash “Hello World”: we will show how to read data from command line or from file, transform the data and send it back to command line or file. In the appendix you will find a note on Logstash CSV … More Logstash “Hello World” Example – Part 1 of the ELK Stack Series

How to set up Docker Monitoring via cAdvisor, InfluxDB and Grafana


Have you ever tried to monitor a docker solution? In this blog post, we will discuss three open source docker monitoring alternatives, before we will go through a step by step guide of a docker monitoring alternative that consist of the components Google cAdvisor as data source, InfluxDB as the database and Grafana for creating the graphs. The post is … More How to set up Docker Monitoring via cAdvisor, InfluxDB and Grafana

Docker HTTP Proxy and DNS Configuration Cheat Sheet (now includes automatic HTTP Proxy detection)


This blog post provides a little cheat sheet on running a Linux host with or without a Docker client behind HTTP proxies. For Ubuntu and similar Linux distributions, we will also show how to detect the proxy available and adapt the proxy settings accordingly. This comes handy, if you are a road warrior that often … More Docker HTTP Proxy and DNS Configuration Cheat Sheet (now includes automatic HTTP Proxy detection)

LXD vs. Docker — or: getting started with LXD Containers


Container technology is not new: it had existed long before the Docker hype around container technology has started after 2013. Now, with Docker containers having reached mainstream usage, there is a high potential of getting confused about available container types like Docker, LXC, LXD and CoreOS rocket. In this blog post we will explain, why LXD is not … More LXD vs. Docker — or: getting started with LXD Containers

Getting started with OpenShift Container Platform


In this blog post we will review the architecture of OpenShift before we will gain some hands-on experience with OpenShift Origin, which is the free version of the OpenShift Container Platform a.k.a. OpenShift Enterprise. Vagrant software will help us to automate the installation of an all-in-one OpenShift Virtual Machine deployed as a VirtualBox image. We will spin up a simple … More Getting started with OpenShift Container Platform

IT Automation Part IV: Ansible Tower “Hello World” Example


This is part IV of a little “Hello World” example for Ansible, an IT automation (DevOps) tool. This time, we will get acquainted with Ansible Tower, a web front end for Ansible. The post has following content: Quickest way of “installing” an Ansible Tower trial system (via Vagrant this time) Step by step guide for a minimalistic “Hello World!” example, following … More IT Automation Part IV: Ansible Tower “Hello World” Example