Exploring GitHub Docker Hub and OCCS Part 4

In my previous post in this series I covered linking GitHub and DockerHub and configuring the environment such that a build of a Docker image was triggered on updates to GitHub. In this final post of the series I will take you through the steps to pull the image from Docker Hub into OCCS in order to run the application. It should be noted that the image built on Docker Hub in my example is only the web tier that contains my Node.js project (APIs and SwaggerUI). The MongoDB component of my OCCS Stack is pulled directly from Docker Hub when my Stack containing the Web Tier and Database Tier services is deployed to OCCS. Continue reading “Exploring GitHub Docker Hub and OCCS Part 4”

Exploring GitHub DockerHub and OCCS Part 3

In my previous post I described how I created a stack definition including my Node.js web application and a MongoDB service using docker-compose. In this article I will describe the steps I took to link my GitHub and Docker Hub accounts in order to automatically build a docker image triggered by a git push command.

Trigger a Build of the MedRec API Docker Image on Docker Hub

Combining internet / cloud based services such as GitHub and Docker Hub allows developers to experience productivity gains without having to fund a local server to provide this capability. I wanted to explore and experience this for myself.

Link Docker Hub and Git Hub accounts

As I didn’t have a docker account for my user I pointed my browser to docker hub … https://hub.docker.com/ and clicked the SignUp option. Continue reading “Exploring GitHub DockerHub and OCCS Part 3”

Exploring GitHub, DockerHub and OCCS Part 2

In my previous post I detailed how I Dockerised the MedRec app. In this post I will show how I added MongoDB and defined a stack using Docker-Compose.

Add MongoDB layer using Docker-Compose

According to the official docker documentation ;

“Compose is a tool for defining and running multi-container Docker applications. With Compose, you use a Compose file to configure your application’s services. Then, using a single command, you create and start all the services from your configuration. ”

A single command to create and start all the services in a configuration sounded pretty good to me. I definitely was keen on exploring docker-compose.

Add a docker-compose.yml file

Having proved that my web application runs up, I now need to address the persistence layer. The above Dockerfile contains the steps to create the required runtime platform for my node app, and installs the node application and package dependences (as specified in the package.json) file by doing the npm install. However if I tried to do a GET or a PUT my app will fail as it won’t find a MongoDB inside my container. I therefore still need a MongoDB somewhere in my environment to hold my application data. Continue reading “Exploring GitHub, DockerHub and OCCS Part 2”

Exploring GitHub Docker Hub and OCCS Part 1

In my previous post in this series I provided an Introduction describing the high level steps I planned to take.
In this post I will walk through the detailed steps to Dockerise the MedRec application.

Dockerise the MedRec APIs

Git clone the project repository

I used my Windows Surface Pro-4 with Oracle VM Virtual Box installed to host my development VM. I managed to source a VBox image that already had Ubuntu 16.04 and Docker installed so that helped get me started. In my development environment on my laptop, I created a directory under my home directory named gitprojects.
I cd into that directory.

cd gitprojects
Continue reading “Exploring GitHub Docker Hub and OCCS Part 1”

Exploring GitHub, DockerHub and OCCS – Introduction

As part of our MedRec API playpen initiative we had already developed some REST API’s using Node.js and leveraged MongoDB running on Oracle IaaS as the persistence layer. . This post describes what I did to dockerise the MedRec API application and eventually run it on the Oracle Container Cloud Service (OCCS).

The APIs have already been made available for interested parties to interact with via SwaggerUI. Of course developers could develop their own code (or any REST client) to interact with them. As a team we used a combination of the Oracle Developer Cloud Service (Git repository, Issue Tracker, Build Server etc) and also the public GitHub to provide public access to our project code. As the source code for the Node.js project containing the API’s was pushed to GitHub I simply did a clone of the Node application code in order to download and run it locally (MedRec API tutorials available here).

The application ran well enough on my local laptop which running Ubuntu 16.04, however I really wanted to be able to try to run the app and MongoDB as a Docker image/stack on my laptop. After I had the application successfully “Dockerised”, then I planned to deploy my application stack to the Oracle Container Cloud Service. I also wanted to explore the use of the GitHub / Docker Hub integration to build my image on Docker Hub, and then from within the Oracle Container Cloud Service (OCCS). With the application image available on Docker Hub, I could then pull my image from that source in order to run it up on OCCS.

A good blog can really help bring you up to speed quickly and help overcome inertia to get you started and I would like to acknowledge the help that Mauricio Payetta’s blog provided me.

In this series of blog posts I plan to retrace what I did during my self-learning. Continue reading “Exploring GitHub, DockerHub and OCCS – Introduction”

Teaching How to use Nginx to frontend your backend services with Trusted CA certificates on HTTPS

Now days with the adoption of Serverless architectures, microservices are becoming a great way to breakdown problem into smaller pieces. One situation that is common to find, is multiple backend services running on technologies like NodeJS, Python, Go, etc. that need to be accessible via HTTPS. It is possible to enable these internal microservices directly with SSL over HTTPS, but a cleaner approach is to use a reverse proxy that front ends these microservices and provides a single HTTPS access channel, allowing a simple internal routing.

In this blog, I am showing how simple it is to create this front end with Nginx and leveraging “Let’s encrypt” to generate trusted certificates attached to it, with strong security policies, so that our website can score an A+ on cryptographic SSL tests conducted by third party organizations.

Continue reading “Teaching How to use Nginx to frontend your backend services with Trusted CA certificates on HTTPS”

Teaching How to Use Alexa to Take Off your Drone using NodeJS

Recently I was in Auckland, New Zealand running an Integration in Action workshop and I used Alexa to trigger some of my APIs, including some NodeJS APIs that I built to take off a drone. Some people found this interesting and asked me to write this blog to explain in detail how it works… So, here it is, I hope you find it useful.

There are multiple ways in which you can make Alexa to call your own APIs. Perhaps the most versatile way is by adding a new skill (see: blog 1, 2). However I found an even easier way to do so, and in order to achieve the MVP approach I have been attempting to practice in my day-to-day life, I took this simpler option, which is simulating a Phillips Hue HA bridge. By doing  so, Alexa detects a new Home Automation (HA) device in “her” network range and accepts voice commands to easily “turn it on” or “turn it off” which you can then leverage to call your own APIs.

Continue reading “Teaching How to Use Alexa to Take Off your Drone using NodeJS”