Deploying Microservice on Kubernetes(MiniKube)

igreendataadmin

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
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Start the minikube using below command

minikube start 
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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
creating namespace ( using kubectl )

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
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Pods:

Verify the pods are up and running by below command

kubectl get pods -n igd
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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
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Please give some time for the external ip to popup, then you can able to access the services

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Minikube Dashboard:

minikube dashboard

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

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To bring down the cluster, please run below command

minikube service stop

Bharathy Poovalingam

Happy Learning !

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