Inter-Reactive Kotlin Applications

Kotlin coroutines is one of the major features of Eclipse Vert.x 3.5.

Most of us are used to writing interactive code and going the reactive way is not a trivial paradigm shift for everyone: programming using asynchronous APIs can be more challenging than using a direct synchronous style, in particular, if you have several operations that you want to do in sequence. Also, error propagation is often more complex when using asynchronous APIs.

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How to customize OpenShift RBAC permissions

Recently I’ve received a question from a customer who would like to restrict user permission in OpenShift Container Platform in order to be compliant with his company’s security policies.

OpenShift has rich and fine-grained RBAC capabilities out of the box, which gives you the possibility to setup exactly who can do actions (verbs in OpenShift word) on every kind of resource.

Before we begin to dive deep into this topic, I have provided links to some resources I think will be of use to help better understand the concepts of roles, roles scope, RoleBinding, groups, etc.

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Open vSwitch without stale ports

Open vSwitch is growing every day and being used in large-scale deployments. Usually, that means there are few ports configured in the vswitch that will be always available, like physical Ethernet ports and several other ports providing networking connectivity to virtual machines or containers. Those other ports are software devices and very often they cannot be reused after a reboot or a system crash for example.

This blog post will talk about how to make sure the vSwitch comes up clean after a system crash or bad shutdown. The idea is that once vSwitch is up, there is no need for another component (usually a remote controller) to iterate over a large number of stale ports and clean them up.

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Example of using Ansible to update Container Native Storage

Container Native Storage (CNS) is implemented in OpenShift as pods. These pods are created from a template that is built into OpenShift. After an automated install, we want to make sure we have the latest template, and the latest containers when using the Advanced Installer. While typically this is a multi-step manual process, an Ansible Script makes this a lot simpler.

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The GDB Python API

GDB has evolved in the last several years to provide a Python API. This series of articles will look at how a user can program GDB with the API and will also take an in-depth look at several features of that API. But, before we begin, a small history lesson is needed and a look at just why an API was needed.

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CloudForms: Manage your IT and Hybrid Cloud through a single platform

Before I start talking about IT and how you can manage, control, and optimize your Hybrid IT infrastructure, I propose that we reflect directly on your living room, where you usually watch TV,  movies, listen to music, play video games, etc. Even if you do not enjoy this type of entertainment, you know that for each of these devices, it is common to use a remote control allowing you to switch between them, manage them, and control all of your favorite programming. While these devices are converging to an all-in-one architecture, they are truly multi-functional. We’ve learned how to handle remote controls at a very young age and it’s the reality we live in. In this case, you are faced with heterogeneous devices and various remote controls, where the number of controls increases as you acquire new devices. It is difficult to have to manage the complexity of a simple task that is to manage your schedule, operating multiple devices, through different controls, with numerous features, and different vendors. Products and vendors bring specific features, use different nomenclature, and provide some features which may or may not be compatible with each other. Going beyond, some of these features made available by vendors, will not even be used throughout the lifetime of these devices, a real waste!

Picture 1 – Managing many devices with many remote controls

Considering this scenario, you might be wondering: What is the relationship of the complexity of having to deal with various entertainment devices and remote controls with your IT infrastructure? And what does this have to do with cloud computing or Hybrid IT?

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