Category: cloud

This topic is related to overall cloud.

How to handle basic dynamic interaction on a webpage with Vue.js

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In this blog post I want to share how to handle basic dynamic content with Vue.js on our Cloud Native Starter landing webpage. Vue.js is an open source licensed “progressive framework for building user interfaces”.

The gif below shows following sequence:

  1. First, the page content changes when a button is clicked. The page shows a little pre-view of content for one of the selected topics on the Cloud Native Starter project landing page. The topics are “Basic Concepts”, “Reactive” and “Security”.
  2. Second, the image on the right hand side changes, a headline appears or changes, a description appears or changes, and a Learn more button appears and changes the content for routing to another webpage.
  3. Third, at the end in the gif the button Learn more is pressed and the page for Basic Concepts is shown.

The questions are: How ..

  • … to change images?
  • … can a text be changed or appear?
  • … to show a button and change the rooting to other webpages?
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Updated: How to prepare for a Hackathon with IBM Cloud?

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In this new blog post I want to address a common situation for developers: You want to participate in a hackathon, and you plan to use IBM Cloud, but you have never used it before. How to prepare? So I created a newer version of my older blog post: How to prepare for a Hackathon with IBM Cloud 

IBM Cloud provides a huge amount of different services, runtimes, and more. From my point of view, one of the most important objectives in a hackathon is:

Run your developed application instance live! To do this you need a runtime 😉

Let’s start with the basics

Let’s get a basic understanding of what does IBM Cloud provide and where to find how to’s?

The IBM Cloud catalog gives you an entry point to find Cloud Services, Software and Consulting, which are organized by different categories.

IBM Cloud has a very good entry point for new users with the getting started page. The page is structure in five major steps.

ibmcloud-starting-point
  1. Explore IBM Cloud
  2. See cloud essentials
  3. Start building
  4. Helpful resources
  5. Get community support

The gif below shows the navigation going through the different steps on the getting started page.

ibmcloud-get-starter

Free online trainings

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Get your Java Microservice up and running!

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In this blog post I want to highlight the hands-on workshop “Get your Java Microservice up and running!“, now available in GitBook . That workshop demonstrates how to build a Microservice with Java and how to deploy the Microservice Kubernetes on the IBM Cloud. The Microservice in this workshop is kept as simple as possible, so that it can be used as a starting point for other Microservices. The Microservice has been developed with Java EE, OpenLiberty and Eclipse MicroProfile.

The workshop is a part of the open source project Cloud Native Starter, which contains sample code that demonstrates how to get started with cloud-native applications and Microservice based architectures.
The Workshop has a related badge called Cloud Native Starter Level 1. This badge is available at Acclaim. In the related quiz you can verify your knowledge you achieved in the workshop.

The gif below show some major steps in the hands-on workshop. You will develop locally a Java Microservice and deploy that Microservice to a free Kubernetes Cluster on IBM Cloud.

microservice docker java kubernetes deployment

I hope this was useful for you and let’s see what’s next?

Greetings,

Thomas

#microprofile, #java, #ibmcloud, #openliberty, #microservices, #kubernetes

Reactive programming is about messages, futures, events, channels and streams

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In this blog post I want to point out the topic of the open sourced Reactive Cloud Native Starter example with Java backend Microservices and a Vue.js frontend web application. The gif below shows the example application. The application simply displays Articles and Authors information on a web page. You also see the creation of Articles with cURL commands in a terminal session and the UI is updated automatically.
(the gif is from the Cloud Native Starter project)

reactive demo
That example was mainly developed by Niklas Heidloff. He wrote a lot of very useful blog posts like Development of Reactive Applications with Quarkus related to that topic.

In this blog post I show, what could be useful to know, when you start with this Cloud Native Starter example for reactive programming to create and consume reactive RESTful APIs in an asynchronous way. I will also give a brief overview of the steps to create an article in the example application.

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Run a PostgreSQL container as a non-root user in OpenShift

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In this blog post I want to point out a simple topic: How to run a simple PostgreSQL Docker image as a non-productive container in OpenShift? As you maybe know, OpenShift doesn’t allow by default to run container images as root.

The image below shows the result of the simply deployed postgreSQL image from dockerhub.

postgres openshift root user ibmcloud

It’s possible to enable images to run as root on OpenShift, that’s documented in the OpenShift documentation here, by adding a service account.

But, in this blog post we choose an alternative way, where we don’t change the security in OpenShift, here we will customize the postgreSQL Docker image a bit. We will follow the steps to create a postgreSQL database on OpenShift, along the creation of the database called postgreSQL database-articles for the Cloud Native Starter reactive example .

These are the major steps:

  1. Write the specifications and configurations  for:
    1. … the Dockerfile
    2. … the  yaml with a Kubernetes Deployment and a Kubernetes Service specification. 
  2. Execute the oc CLI commands to:
    1. … create a OpenShift project
    2. … create a OpenShift build configuration
    3. … start the build
    4. … apply the Deployment and Service specification
    5. … expose the Service

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Setup a MongoDB in less than 4 min on a free IBM Cloud Kubernetes cluster at a Hackathon

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In this blog post I want to highlight that I just created a GitHub project and a 10 min YouTube video to “How to setup mongoDB in less than 4 min on a free IBM Cloud Kubernetes cluster at a Hackathon”.

My objective is to provide a small guide, how to setup a MongoDB server and Mongo UI (Mongo-Express)  on a free IBM Cloud Kubernetes cluster and when you don’t want to use the existing MongoDB service on IBM Cloud.

On the free IBM Cloud Kubernetes cluster:  No persistent volume claims are used. So, keep in mind, if your Pod in Kubernetes crashes the data of the database is lost.

Based on the “security feature” of the MongoDB default port 27017, you need to run the application to access the MongoDB server in the Kubernetes cluster .

In other words, your UI application has to access the database with a server application, which also runs on the free Kubernetes cluster (like the Mongo UI (Mongo-Express)  in that example here). You should implement a backend for frontend architecture.

The YouTube video shows the setup and a description how it works.

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Invoke reactive Endpoints with Quarkus and MicroProfile

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In this blog post I want to point out that I just created a 15 min YouTube video related to the great Hands-on workshop: Reactive Endpoints with Quarkus on OpenShift. In this video you can watch and follow the steps of the exercise 3 “Invoke Endpoints reactively”. Niklas wrote a great blog post about the topic of that exercise. This is the name and link of his blog post Invoking REST APIs asynchronously with Quarkus.

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Develop reactive Endpoints with Quarkus

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In this blog post I want to point out that I just created a 12 min YouTube video related to the great Hands-on workshop: Reactive Endpoints with Quarkus on OpenShift. In this video you can watch and follow the steps of the exercise 2 “Develop reactive Endpoints”. Niklas wrote a great blog post about the topic of that exercise. This is the name and link of his blog post Developing reactive REST APIs with Quarkus.

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