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Dockerizing an existing Rails application

Docker is a relatively new and rapidly growing project that allows creating very light “virtual machines”. Prerequisites There are no specific skills needed for this tutorial beyond a basic comfort with the command line and using a text editor. The following services are needed: Docker Hub (Login – Signup if you haven’t ) A Rails application Setting up your computer Getting ...

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Why Elvis Should Not Visit Java

I was recently involved in quite a long Twitter discussion regarding Java’s Optional, type systems that distinguish nullable and non-nullable types and the the Elvis operator, which allows null-safe member selection. The latter was peddled as a killer feature for succinct null-handling, which I strongly disagree with. My opinion on the matter is that without a type system that allows ...

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Build IoT project with Arduino sensor in 3 Steps

This post describes how to create an IoT project using Arduino sensor. You will learn how easy is creating an IoT app that monitors gas in a room using Arduino sensors and send a notification when the gas is over the threshold. We can build a simple gas monitoring system in a few steps. First of all, we assume you ...

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Push Spring Boot Docker images on ECR

On a previous blog we integrated a spring boot application with EC2. It is one of the most raw forms of deployment that you can have on Amazon Web Services. On this tutorial we will create a docker image with our application which will be stored to the Amazon EC2 container registry. You need to have the aws cli tool ...

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Docker Benefits for the Enterprise

When it comes to application infrastructure, containerization is king. What was once the hot new thing in the DevOps wild west is now maturing into a more stable and widely adopted technology. But despite this growing popularity, it’s still a young technology and as with all things new, adoption can be overwhelming — especially for large companies that already have ...

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Perfecting Lambda Architecture with Oracle Data Integrator (and Kafka / MapR Streams)

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“Lambda architecture is a data-processing architecture designed to handle massive quantities of data by taking advantage of both batch– and stream-processing methods. This approach to architecture attempts to balance latency, throughput, and fault-tolerance by using batch processing to provide comprehensive and accurate views of batch data, while simultaneously using real-time stream processing to provide views of online data. The two view outputs may be joined before presentation. The rise ...

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Microservice using Docker stack deploy – WildFly, Java EE and Couchbase

There is plenty of material on microservices, just google it! I gave a presentation on refactoring monolith to microservices at Devoxx Belgium a couple of years back and it has good reviews: This blog will show how Docker simplifies creation and shutting down of a microservice. All code used in this blog is at github.com/arun-gupta/couchbase-javaee. Microservice Definition using Compose Docker 1.13 introduced a v3 of Docker ...

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User Story Reflections

Users As its name suggests, a user story describes how a user or customer uses the product–a digital product is captured from the perspective of the users. This avoids a solution-centric view where we worry more about how to provide and implement the product features than why and how people will use them. Understanding who the users are and how the product ...

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Processing billions of events/day

Throughout the lifecycle of a company the IT architecture is bound to change multiple times. There can be many different reasons for such changes. One of the worst reasons for such change can be when developers get bored by a particular solution and just wish to follow whatever the newest hype happens to be. Some of the reasons why the ...

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