Deploying Microservice on Kubernetes(MiniKube)

This blog is to demonstrate, how to deploy spring boot application into minikube cluster and access it

Pre-requisites:

Need to have Java, Docker and Minikube installed on mac

Minikube Installation:

Install minikube using brew command :

brew install minikube

Start the minikube using below command

minikube start 

Please verify the status of minikube by running below command

minikube status

And to bring down the minikube, pls run below command

minikube stop

Code Build :

Package your application ( Spring Boot Microservice ) and using maven/gradle build tool to generate jar using particular command/task ( mvn clean install )

Build:

docker build -t igd/spring-jpademo:1 ( Build and Tag )

Run:

Run the image to make sure, you can able to run the image and hit it
docker run -p 8080:8080 igd/spring-jpademo:1

• Create a Dockerfile to build a image
• Use docker build to tag a image ( which can be pushed to artifactory or container registry )
• docker run to verify the image

Namespace:

Before creating a deployment, can have namespace created to have deployments tagged to the namespace

Namespace:
Syntax : kubectl create ns <<namespace_name>>
kubectl create ns igd

Deployment:

To create a deployment, need to have a deployment yaml file

apiVersion: apps/v
kind: Deployment
metadata:
  creationTimestamp: null
  labels:
    app: employee-app
  name: employee-app
spec:
  replicas: 2
  selector:
    matchLabels:
      app: employee-app
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: employee-app
    spec:
      containers:
      - image: igd/spring-jpademo:1
        name: employee-app
        imagePullPolicy: Never
        resources: {}
        ports:
          - containerPort: 8080
status: {}1

Command to create a deployment and tag it to the namespace “igd” created before

Deployment
kubectl create -f app_deploy.yml -n igd

Verify the deployment is created and its running fine

kubectl get deploy -n igd

Pods:

Verify the pods are up and running by below command

kubectl get pods -n igd

Services:

Need to create service as type “LoadBalancer”, so that it can be accessed outside the cluster

kubectl expose deployment employee-app -n igd --type=LoadBalancer --port=8080 

kubectl get services -n igd

Please give some time for the external ip to popup, then you can able to access the services

Minikube Dashboard:

minikube dashboard

Once the dashboard opens up, please choose the namespace from the dropdown, to view the services been deployed

To bring down the cluster, please run below command

minikube service stop

Bharathy Poovalingam

Happy Learning !