OpenShift v3 (Mega Tutorial) – Part 3 – CLI


OpenShift v3 – CLI

OpenShift offers two different ways to connect the API: command line and via Web. Lets start taking a look the  CLI (Command Line Interface).


With OpenShift we have two tools to manage the cluster:

  • oc: the basic tool; developed to create and manage projects and applications. Is a tool for the developers.
  • oadm: the tool for cluster management. It can manage resources as limits, policies, security.

Both are availables in any host of the cluster we have been created, but it can also be downloaded and use them in a remote machine. There are two versions: oc only, for Linux/Mac/Windows platforms, and oc+oadm exclusively for Linux You can download them here.

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OpenShift v3 (Mega Tutorial) – Part 2 – Ansible


OpenShift v3 – Ansible

Ansible is a radically simple IT automation engine that automates cloud provisioning,configuration management, application deployment, intra-service orchestration, and many other IT needs.

Designed for multi-tier deployments since day one, Ansible models your IT infrastructure by describing how all of your systems inter-relate, rather than just managing one system at a time.

It uses no agents and no additional custom security infrastructure, so it’s easy to deploy – and most importantly, it uses a very simple language (YAML, in the form of Ansible Playbooks) that allow you to describe your automation jobs in a way that approaches plain English.

On this page, we’ll give you a really quick overview so you can see things in context. For more detail, hop over to


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OpenShift v3 (Mega Tutorial) – Part 1 – Base Installation


OpenShift v3 – Base installation

There are two installation processes:

  1. Simple: That it can be done in three ways. I will not follow those methods, but if you can try it you can follow the available OpenShift documentation
    • Docker container: You can download the all-in-one image from dockerhub.
    • Download binaries: Red Hat offers binaries to be run in our system. Another all-in-one model available on the OpenShift github.
    • Source code: As OpenShift is Open Source you can download and compile it. All-in-one also available in github
  2. Advanced: It uses Ansible and we are going to do it during this tutorial, because it will be a production-like environment.

Do we start?

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OpenShift v3 (Mega Tutorial) – Introduction


OpenShift v3


OpenShift v3 brings many architectural changes and introduces new concepts and components. It is built around the applications running in Docker containers, scheduling and management support provided by the Kubernetes project, and augmented deployment, orchestration, and routing functionality on top.

The most significant changes surround the container model and how they are monitored and interconnected. Kubernetespods are a group of containers that act like a single VM: they have a single IP address, they can share a file system, and they typically have similar security settings. Grouping containers together vastly increases the number of applications that can be brought to OpenShift. Rather than focusing on a microservice model to the exclusion of all other patterns, pods enable developers to port existing applications that need to share local resources while still benefiting from a containerized model.

Second, OpenShift containers are expected to be immutable: the image contains a particular snapshot of application code and its dependent libraries, while any configuration, secrets, or persistent data is attached to the container at runtime. This allows administrators and integrators to separate code and patches from configuration and data. While it is still possible to mutate your containers, the higher level concepts of build and deployments leverage immutable containers to provide higher level guarantees about what code is running where.

The third important change is in the core system design: OpenShift and Kubernetes are built as sets of microservices working together through common REST APIs to change the system. Those same APIs are available to system integrators, and those same core components can be disabled to allow alternative implementations. A great example of this are thewatch APIs: clients can connect and receive a stream of changes to pods (or other objects) and take action on them as the pods become available (to signal errors or log changes to the system). OpenShift exposes fine-grained access control on the REST APIs to enable this integration, which means there are no actions in the system that cannot also be done by an integrator.

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OMG!! A year without updating

Oh my god!!! I do not what just happened. Well, already I do. I have been very busy with a big project related to OpenShift, something about Amadeus (I know nothing) Amadeus innovates customer service with OpenShift Enterprise by Red Hat

That is the deal, during next weeks I will be updating this site. I have something new to share with you:

  • About docker containers
  • A little bit of terraform
  • JBoss EAP 7, what is new
  • And another tutorial about OpenShift, now with version 3

Take it easy, we are on holidays season!!

RHCOE-PaaS Acquired



Yes, after long weeks of study and preparation finally I have my rhcoe-PaaS certification (Red Hat Certificate Of Expertise in Platform-as-a-Service) which certifies my ability to install, configure and manage an Enterprise OpenShift PaaS.

Too bad, Red Hat not yet provide the logos to attach the signature of my emails.

See you soon.


OpenShift Origin installation over Fedora 19 (Mega Tutorial) – Part 4


OpenShift Origin

After the broker configuration in the previous post (installing packages and configuring gears), now it’s time to configure OpenShift core services through various plugins.

These plugins are responsible to manage authentication, updating DNS or messaging between nodes. Have their own config files, and also we have some sample files we can use as templates.

Let’s go. Continue reading