Devops-test helm deployment

A repository that provides Helm deployment chart for an application running nextjs + mongodb

Pre-requisite

• helm chart values are filled in to work with minikube on linux machine
• enable minikube nginx ingress controller

minikube addons enable ingress

Deploy the app

• clone this git repository

git clone git@github.com:tyborr/devops-test-deploy.git

• deploy the chart

helm install nextjs-cats-api devops-test-deploy/

• verify the deployment

$ helm list
                             
NAME           	NAMESPACE	REVISION	UPDATED                                 	STATUS  	CHART              	APP VERSION
nextjs-cats-api	default  	1       	2021-10-17 12:22:05.808640847 +0200 CEST	deployed	devops-deploy-0.1.0	1.16.0     

• get your minikube IP

minikube ip

• edit your /etc/hosts file to contain a line mapping your minikube's IP to a domain, e.g:

$MINIKUBE_IP cats.api

Uninstalling the app

• to uninstall the app run

helm uninstall nextjs-cats-api

Scaling the application - ideas & potential issues

1. Move MongoDB to a dedicated Pod and add PersistentVolumeClaim
2. Having multiple replicas might result in a data (like uploaded cats' pictures) not always be visible - e.g uploaded files are stored in particular pod's local filesystem, so they won't be visible if a request is handled by a secondary pod. In order to avoid that an application has to be stateless (i.e. uploaded files can be stored using a cloud solution - like Google Object Storage).