Categories
00 - Cloud-Native App Dev cloud computing container Containers development DevOps infrastructure persistent-storage Red Hat Advanced Cluster Management for Kubernetes

OpenShift Local or Single Node OpenShift

Are you a developer or just a curious individual who wants to dip their toes in the Cloud, but are not sure whether to go for OpenShift Local or Single Node OpenShift? You’ve come to the right place. In this article, I will explore the differences and similarities between these two variants of OpenShift, so […]

Categories
00 - Cloud-Native App Dev

Automated Application Packaging And Distribution with OpenShift – Helm Charts and Operators – Part 2/4

Part two of the article series. This time about Helm Charts, Operators and various CLI tools to work with container images.

Categories
00 - Cloud-Native App Dev

How to go from Docker to Kubernetes the right way

Docker came a long way. It established itself very fast as the de-facto standard to get going with your container journey. It did not matter if you wanted to just play around with containers or if you wanted to build up new microservices, Docker was and still is a great choice to get yourself started. […]

Categories
00 - Hybrid Cloud Infrastructure

Container images, multi-architecture, manifests, ids, digests – what’s behind?

Many of us use container images from day to day, maybe also in many various architectures. For example on your Raspberry PI (aarch64), do you really know how it works in detail? I have worked with container images more or less since 2015 but during an OpenShift 4 air-gapped installation and mirroring of images into […]

Categories
Containers Kubernetes Networking OpenShift Uncategorized

OPENSHIFT NETWORKING FROM A CONTAINER/WORKLOAD POINT OF VIEW – PART 6: CONTROLLING EGRESS TRAFFIC

OpenShift 3.3 and later contain the functionality to route pod traffic to the external world via a well-defined IP address. This is useful for example if your external services are protected using a firewall and you do not want to open the firewall to all cluster nodes. The way it works is that a egress […]

Categories
Containers Kubernetes Networking OpenShift Uncategorized

OPENSHIFT NETWORKING FROM A CONTAINER/WORKLOAD POINT OF VIEW – PART 5: OPENSHIFT ROUTER

In the OpenShift world, Services take place on the OSI Layer 3 / IP, while Routing is an OSI Layer 7 / HTTP/TLS concept. Once you’ve wrapped your head around this backwards choice of naming, things are fairly easy: An OpenShift Router is a component which listens on a physical host’s HTTP/S ports for incoming […]

Categories
Cloud Containers OpenShift Technology

OPENSHIFT NETWORKING FROM A CONTAINER/WORKLOAD POINT OF VIEW – PART 4: CONTAINER NETWORKING USING OPENSHIFT/KUBERNETES SERVICES

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 […]

Categories
Cloud Containers OpenShift Technology Uncategorized

OPENSHIFT NETWORKING FROM A CONTAINER/WORKLOAD POINT OF VIEW – PART 3: CONTAINER NETWORKING ACROSS OPENSHIFT NODES

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, […]

Categories
ansible ansible tower container Containers Integration IoT jbds JBoss Fuse python tower Uncategorized

Building the IoT Smart Gateway with Docker, Raspberry Pi and JBoss for the “lazy” ones – Ansible rules!

If you have followed my earlier posts, then you know, that I’m in the process of building an IoT Demo, with a Raspberry Pi2  as the Smart Gateway. During this process, I had to re-install my Raspberry multiple times, but after the second time I got a bit tired of doing the same steps over […]

Categories
DevOps OpenShift PaaS

Securing the OpenShift V3 Registry

In my previous post I described how to manually export/import a Docker image from one system into the Docker registry of OpenShift. A next step would be to push an image from a non OpenShift system directly into the registry. The documentation of OpenShift recommends to secure the registry before opening it for external access. […]

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