To allow stable endpoints in an environment of ever changing starting and stopping Pods (and therefore constantly changing IP addresses), Kubernetes introduces (and OpenShift uses) the concept of services. Services are stable IP addresses (taken per default from the 172.30.0.0/16 subnet) that remain the same as long as the service exists. Connection requests to a […]
So far, this sounds like a lot of effort to achieve a little more than a plain docker host – containers that can talk to each other and to the host network, potentially segregated based on kubernetes namespace. However OpenShift SDN also allows pods on different nodes to communicate with each other. To this end, […]
Abstract Many organisations are now facing a challenge when it comes to choosing and setting up the right messaging infrastructure. It must be able to scale and handle massive parallel connections. This challenge often emerges with IoT & Big Data projects where a massive number of sensors are potentially connected to produce messages that need to […]
In OpenShift, networking is equally simple from a container point of view. Within the container’s namespace there is a eth0 network interface configured and services such as DNS just work. You can still use dedicated NICs on the host to isolate specific types of traffic. What’s the difference? It turns out there is hardly any […]
From a container point of view, networking on a plain Docker Host is simple. A running container is nothing more than a Linux process which is namespaced and constrained with regards to access (SELinux) and resource consumption (cgroups). In each namespace, there is a single (virtual) network interface called eth0 which is assigned an IP […]
If you are debugging IPTables, it is handy to be able to trace the packets while it traverses the various chains. I was trying to find out why port forwarding from the external NIC to a virtual machine attached to a virtual bridge device was not working. You need to perform the following preparations: Load […]
A dear colleague of mine provided me with a Texas Instruments Sensortag Unfortunately this present was connected with the request to get it running with my Intel Edison and the Smart Gateway. This blog will be part one of my endeavor. Update the Intel Edison My Intel Edison still runs the old firmware, so the […]
In this blog I would like to demonstrate how easy it is to develop a mobile app with AngularJS and NodeJS. The goal is to develop the app locally and build an Android application with RHMAP later on. ‘RHMAP’ stands for ‘Red Hat Mobile Application Plattform‘. Maybe you know it as ‘FeedHenry’. What’s the target […]
This blog will cover my first experiments with an Intel Edison, a small Computer-on-Module, which Intel was so kind to give to me! Thanks again for this guys! There are many websites explaining how to setup your development computer to work with an Intel Edison, like Intels own website. So I will assume you have followed […]
This is part 5 of my IoT series of blogs. So far we did look at the following topic Introduction into the planned scenario Building a Raspberry Pi based Smart Gateway ESP8266 and DHT22 based smart sensor Putting the Smart into the Smart IoT Device Setting up an “all in one” demo environment This post will […]