Challenge

Requirements

To deploy this stack you will need:

kubectl installed
kustomize installed
Access to a Kubernetes cluster

Architecture

Web Proxy: I decided to use Nginx Ingress solution, due the configuration of Nginx Ingress in every major cloud, it should generate a LoadBalancer with an external IP ready for use
Web App: A golang app with http module

Deployment

I've generated a simple script which with Kustomize generates de config and apply it in the current cluster configured

We can pass to the scripts parameters like environment ($1) and tag ($2), so it can be easily adapted to more config

i.e

build/build.sh dev latest

This should generate a manifest with all configuration needed:

apiVersion: v1
kind: Service
metadata:
  name: api
  namespace: demo
spec:
  ports:
  - name: http
    port: 80
    protocol: TCP
    targetPort: 8080
  selector:
    app: api
---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: api
  name: api
  namespace: demo
spec:
  replicas: 1
  selector:
    matchLabels:
      app: api
  strategy:
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 1
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: api
    spec:
      containers:
      - image: vmerino/go-app:latest
        imagePullPolicy: Always
        name: api-go
        ports:
        - containerPort: 8080
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: demo-ingress
spec:
  rules:
  - http:
      paths:
      - backend:
          serviceName: api
          servicePort: 80
        path: /

After everything configured you should be able to access via:

$ curl -L http://IP_ADDRESS/hello
{ "Hello": "world" }

Additional notes

I've configured a trigger in docker-hub which generates the image used in this exercise vmerino/go-app in order to simulate build process

Motivation

I've decided to go with Kubernetes since I've been working with K8s for some time ago, also the challenge somehow remind me as a Microservice architecture, so it can be easily scalable with adding some extra configuration.