Presenting at ODevCYatra 2018 in Hyderabad, Pune and Mumbai (11, 13 and 14 July)
In 2013 I have participated in the OTN Yatra – a conference tour of six cities in India (). This year I am glad to be back for a …
Author: Lucas Jellema
Running Istio on Oracle Kubernetes Engine–the managed Kubernetes Cloud Service
In a recent post, I introduced the managed Oracle Cloud Service for Kubernetes, the Oracle Kubernetes Engine (OKE): https://technology.amis.nl/2018/05/25/first-steps-with-oracle-kubernetes-engine-the-managed-kubernetes-cloud-service/. A logical next step when working with Kubernetes in somewhat …
First steps with Oracle Kubernetes Engine–the managed Kubernetes Cloud Service
Oracle recently (May 2018) launched its Managed Kubernetes Cloud Service (OKE – Oracle Kubernetes Engine) – see for example this announcement: https://blogs.oracle.com/developers/kubecon-europe-2018-oracle-open-serverless-standards-fn-project-and-kubernetes. Yesterday I got my self a new …
Running Kafka, KSQL and the Confluent Open Source Platform 4.x using Docker Compose on a Windows machine
For conducting some experiments and preparing several demonstrations I needed a locally running Kafka Cluster (of a recent release) in combination with a KSQL server instance. Additional components from …
Simple CQRS – Tweets to Apache Kafka to Elastic Search Index using a little Node code
Put simply – CQRS (Command Query Responsibility Segregation) is an architecture pattern that recognizes the fact that it may be wise to separate the database that processes data manipulations …
Rapidly spinning up a VM with Ubuntu and Docker–on my Windows machine using Vagrant and VirtualBox
I have a Windows laptop. And of course I want to work with Docker containers. Using the Docker Quickstart Terminal is one way of doing so, and to some …
Get going with KSQL on Kubernetes
This article describes how to quickly get going with KSQL on Kubernetes. KSQL is Confuent’s ‘continuous streaming query language’. It allows us to write SQL-like queries that operate on …
15 Minutes to get a Kafka Cluster running on Kubernetes – and start producing and consuming from a Node application
For workshop I will present on microservices and communication patterns I need attendees to have their own local Kafka Cluster. I have found a way to have them up …
Remote and Programmatic Manipulation of Docker Containers from a Node application using Dockerode
In previous articles, I have talked about using Docker Containers in smart testing strategies by creating a container image that contains the baseline of the application and the required …
Quickly spinning up Docker Containers with baseline Oracle Database Setup – for performing automated tests
Here is a procedure for running an Oracle Database, preparing a baseline in objects (tables, stored procedures) and data, creating an image of that baseline and subsequently running containers …
First steps with Docker Checkpoint – to create and restore snapshots of running containers
Docker Containers can be stopped and started again. Changes made to the file system in a running container will survive this deliberate stop and start cycle. Data in memory …
Handle a GitHub Push Event from a Web Hook Trigger in a Node application
My requirement in this case: a push of one or more commits to a GitHub repository need to trigger a Node application that inspects the commit and when specific …
Node & Express application to proxy HTTP requests – simply forwarding the response to the original caller
The requirement is simple: a Node JS application that receives HTTP requests and forwards (some of) them to other hosts and subsequently the returns the responses it receives to …
Create a Node JS application for Downloading sources from GitHub
My objective: create a Node application to download sources from a repository on GitHub. I want to use this application to read a simple package.json-like file (that describes which …
Get going with Project Fn on a remote Kubernetes Cluster from a Windows laptop–using Vagrant, VirtualBox, Docker, Helm and kubectl
The challenge I describe in this article is quite specific. I have a Windows laptop. I have access to a remote Kubernetes cluster (on Oracle Cloud Infrastructure). I want …
Some of my Solutions for challenges with Oracle JET
This article is not some sophisticated treatise on Oracle JET fundamentals.It is merely a collection of challenges I had to deal with and found solutions for – that work, …
Oracle JET Web Applications – Automating Build, Package and Deploy (to Application Container Cloud) using a Docker Container
The essential message of this article is the automation for Oracle JET application of the flow from source code commit to a running application on Oracle Application Container Cloud, …
Pure Client Side Event Exchange between ADF Taskflows and Rich Client Web Applications such as Oracle JET, Angular and React
For one of our current projects I have done some explorations into the combination of ADF (and WebCenter Portal in our specific case) with JET. Our customer has existing …
Set up continuous application build and delivery from Git to Kubernetes with Oracle Wercker
It is nice – to push code to a branch in a Git repository and after a little while find the freshly built application up and running in the …
Communicate events in ADF based UI areas to embedded Rich Client Applications such as Oracle JET, Angular and React
For one of our current projects I have done some explorations into the combination of ADF (and WebCenter Portal in our specific case) with JET. Our customer has existing …
Introducing Elastic Search NoSQL to Oracle SQL developers – comparing dozens of ElasticSearch and SQL operations (a bit like Rosetta)
Even for organizations with strong roots in relational databases such as Oracle RDBMS, there may be valuable opportunities for leveraging additional data sources, for example to support special (search) …
Publish Events from any Web Application in IFRAME to ADF Applications
Even though ADF does not always play nice with guests, it is becoming increasingly common to have ADF applications – pure ADF or WebCenter Portal – that are the …
Promoting a simple Oracle JET input text component to a Visual Country Selection component
To select a country (or any other geographical entity), we can offer our end users a dropdown list, a list of values in a popup window, an auto suggest …
Using an OpenLayers map to select countries in an Oracle JET application
In a recent article I discussed how the open source geo, GIS and map library OpenLayers can be used in an Oracle JET application. That article shows how countries …
Embedding OpenLayers in Oracle JET for Advanced Maps and GIS style User Interfaces
Oracle JET is a toolkit for the creation of rich web applications. Many applications will have location-related aspects. Such applications can benefit from advanced map capabilities – for presenting …
Handle HTTP PATCH request with Java Servlet
The Java Servlet specification does not include handling a PATCH request. That means that class javax.servlet.http.HttpServlet does not have a doPatch() method, unlike doGet, doPost, doPut etc. That does …
Oracle Managed Kubernetes Cloud– First Steps with Automated Deployment using Wercker Pipelines
Oracle announced a managed Kubernetes Cloud service during Oracle OpenWorld 2017. This week, I had an opportunity to work with this new container native cloud offering. It is quite …
Implementing Authentication for REST API calls from JET Applications embedded in ADF or WebCenter Portal using JSON Web Token (JWT)
The situation discussed in this article is as follows: a rich client web application (JavaScript based, could be created with Oracle JET or based on Angular/Vue/React/Ember/…) is embedded in …
Microservices and Updating Data Bound Context on Oracle Cloud with Application Container and Event Hub (plus DBaaS and MongoDB)–Part Two
This article describes – in two installments – how events are used to communicate a change in a data record owned by the Customer microservice to consumers such as …
Microservices and Updating Data Bound Context on Oracle Cloud with Application Container and Event Hub (plus DBaaS and MongoDB)–Part One
This article describes – in two installments – how events are used to communicate a change in a data record owned by the Customer microservice to consumers such as …
Prepare and link bind Oracle Database Cloud, Application Container Cloud, Application Container Cache and Event Hub
A fairly common combination of Oracle Public Cloud services that I use together – for example for the implementation of microservices – is DBaaS, Application Container Cloud, Application Cache …
Online Videos with Lucas Jellema–Live recording of Talks, Interviews and Stuff
Oracle Code Rome 2019 – Business and IT Agility Through DevOps and Microservice Architecture Powered by Containers and Cloud: https://www.youtube.com/watch?v=gm9vfK9fILM Turn Data into Business Value – Starting with Data …
Run Oracle Database in Docker using prebaked image from Oracle Container Registry–a two minute guide
This article will show how to run an Oracle Database on a Docker host using the prebaked images on Oracle Continer Registry. It is my expectation that it takes …
Quick introduction to Oracle Container Registry–running one of Oracle’s prebaked images
Oracle has been active with Docker for quite some time now. From the first hesitant steps from some enthusiastic employees with Docker build files that helped people to get …
First steps with Istio on Kubernetes on Minikube on Windows 10
In this article, I discuss my steps to get going with Istio on Kubernetes running on Minikube on Windows 10. Unfortunately, I have ran into an issue with Istio. …
Installing Minikube and Kubernetes on Windows 10
Quick notes on the installaton of Minikube for trying out Kubernetes on my Windows 10 laptop (using VirtualBox –not Hyper-V) Following instructions in https://www.ibm.com/support/knowledgecenter/en/SS5PWC/minikube.html Download Windows installer for MiniKube: …
Rapid first few steps with Fn – open source project for serverless functions
Project Fn is an open source project that provides a container native, poly-language, cloud agnostic (aka run on any cloud) serverless platform for running functions. Fn was launched during …
Create Debian VM with Docker Host using Vagrant–automatically include Guest Additions
A short and simple article. I needed a Debian VM that I could use as Docker host – to run on my Windows 10 laptop. I resorted to Vagrant. …
JSON manipulation in Java 9 JShell
In this article I will demonstrate how we can work with JSON based data – for analysis, exploration, cleansing and processing – in JShell, much like we do in …
Java 9 – First baby steps with Modules and jlink
In a recent article, I created an isolated Docker Container as Java 9 R&D environment: https://technology.amis.nl/2017/10/11/quick-and-clean-start-with-java-9-running-docker-container-in-virtualbox-vm-on-windows-10-courtesy-of-vagrant/. In this article, I will use that environment to take few small steps …