Rails application running with Kubernetes Using the Minikube

Goals: 1- Create an image for a Rails application 2- create a ConfigMap to define environment variables 3- Create a Database, Cache and Rails services

Prerequisites install docker, Minikube and kubectl

start cluster minikube start eval $(minikube docker-env)

Building our Rails Images

Using the rails application that can be found here [https://semaphoreci.com/community/tutorials/dockerizing-a-ruby-on-rails-application]. follow along.

after follow, let’s build the image and give it a [mahaga50/drkiq] name

docker build -t mahaga50/drkiq:1 .

Creating the env ConfigMap

` kubectl create configmap env-config \
--from-literal=postgres_user=drkiq \
--from-literal=postgres_password=yourpassword \
--from-literal=postgres_host=postgres \
--from-literal=WORKER_PROCESSES=1 \
--from-literal=LISTEN_ON=0.0.0.0:8000 \
--from-literal=DATABASE_URL=postgresql://drkiq:yourpassword@postgres:5432/drkiq?encoding=utf8&pool=5&timeout=5000 \
--from-literal=CACHE_URL=redis://redis:6379/0 \
--from-literal=JOB_WORKER_URL=redis://redis:6379/0 `

to check configration kubectl get configmap env-config -o yaml if found error you can edit: kubectl edit configmap env-config

Creating a Database and Cache Deployment

Creating the postgres service kubectl create -f deploy/postgres.yml

Creating the redis service kubectl create -f deploy/redis.yml

Creating an app Deployment

kubectl create -f deploy/drkiq.yml kubectl create -f deploy/sidekiq.yml

Initialize the Database

kubectl exec [podid] -it -- rake db:reset kubectl exec [podid] -it -- rake db:migrate

start service minikube service drkiq --url