Fibonacci-Overkill

This is a wildly over-egineered fibonacci calculator, created primarliy for testing a multi-service deploy using kubernetes.

• Design
• Build
  • Requirements
  • Pre-build requirements
  • Building
  • Running
  • Logging

Design

The goal of this system is to have a user enter the index of a fibonacci number to be calculated. The API layer managers storing that number in Postgres (you know, for storage reasons) and also sends the index off to be calculated by a fibonnaci calculation worker. This is done using a pub/sub design with Redis as the mediator. The UI is written using React.js, and the API service as well as the worker are written in Go.

The system is deployed for local sandboxing with Kubernetes via Minikube

Build

Requirements

• Minikube 1.11.0
• Helm 3.0.0 (optional)
• Golang 1.12.0
• NPM 5.8.0

Pre-build requirements

Just a couple things to ensure we can use minikube as a sanbox environment. First we will be using the internal docker repository to store the service images, so we have to connect to the minikube docker environment (unfortunetly this needs to be done every time you open up a shell):

minikube start
eval $(minikube docker-env)

Then we just have to make sure minikube will let us use the ingress

minikube addons enable ingress

Building

To build and deploy everything to minikube:

make build-and-deploy

If you want to remove everything (K8s deploy, docker images, and binaries)

make destroy

Running

The UI and API service will be available via the minikube IP, this can be found using:

minikube ip

You may get a security warning trying to access the site as there is no SSL cert. You should see something that looks like this:

Enable Logging via ELK

This requires Helm to be installed to set up

make setup-logging # It will take 3-5 minutes for everything to spin up

This will install Elasticsearch and Kibana for log searching and display, as well as Filebeat for log aggregation and Metricbeat for metrics gathering. You can view the data by running the following

make start-logging

The log stream can be found by navigating to http://localhost:5601/app/logs in your browser.

If you want to remove the logging stack run:

make remove-logging