Deploying Spring Boot application on K8S

Harshal Jethwa's photo
Harshal Jethwa
·

2 min read

Introduction

In this article, we will be deploying a Java Spring Boot Application on Kubernetes.
Here’s a high-level overview of the process of deploying a Spring Boot application on Kubernetes:

  1. Containerize the Spring Boot Application

  2. Create Kubernetes Deployment

  3. Define Kubernetes Services

  4. Deploy the Application to Kubernetes Cluster

Setups:

GitHub Repo for source code:

https://github.com/HARSHALJETHWA19/springboot-k8s.git

Setup :
Launch an instance from an Amazon Linux 2 or Amazon Linux AMI
with t2.medium

2. Connect to your instance.

3. Update the packages and package caches you have installed on

your instance.

yum update -y

Docker Service :

yum install docker -y
docker -v

Start the Docker service

systemctl start docker
systemctl enable docker

Install Conntrack and git:

yum install conntrack -y
yum install git -y

Install Kubernetes(k8) :

curl -LO
https://storage.googleapis.com/minikube/releases/latest/minikubelinux-
amd64
sudo install minikube-linux-amd64 /usr/local/bin/minikube

Start Minikube :

minikube start --force --driver=docker
minikube version

Install kubectl :

sudo curl -LO "https://dl.k8s.io/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl"
sudo chmod +x kubectl
sudo mv kubectl /usr/local/bin/

Clone the repo :

cd /opt/
git clone https://github.com/HARSHALJETHWA19/springboot-k8s.git

Make the Database UP:

cd springboot-k8s
kubectl create -f db-deployment.yaml
kubectl get pods
kubectl exec -it mysql-79554598b8-rqzj8 -- /bin/bash
mysql -u root -p root
show databases;

Maven Install :

yum install maven -y

Create the docker image :

docker build -t harshal1903/springboot-crud-k8s:1.0 .
docker login 
[ CREATE A DOCKER HUB ACCOUNT BEFORE ]
Give dockerhub username and password

docker image push harshal1903/springboot-crud-k8s:1.0
kubectl apply -f app-deployment.yaml
kubectl get svc
minikube ip

PUT PORT FORWARD :

kubectl port-forward --address 0.0.0.0 svc/springbootcrud-
svc 8080:8080 &

[HOST PORT TO CONTAINER PORT]\

kubectl port-forward --address 0.0.0.0 svc/{your service name}
{external port to the Internet}:{your service port, the port your app is
listening on in it's container}

for example, if my service is named store and is listening on 80

kubectl port-forward --address 0.0.0.0 svc/store 8888:80

JSON DATA TO BE HITTED WITH POST :

URL POST — http://<EC2IP>:8080/orders

Check Database

URL GET — http://<EC2IP>:8080/orders/1

FOR DASHBOARD:

/usr/local/bin/kubectl proxy — address=’0.0.0.0' — accept-hosts=’^*$’

IN OTHER TERMINAL

minikube dashboard

20 — Hit this url in browser

http://<EC2IP>:8001/api/v1/namespaces/kubernetesdashboard/

services/http:kubernetesdashboard:/

proxy/#/pod?namespace=default

Follow me :

Linkedin: https://www.linkedin.com/in/harshaljethwa/

GitHub: https://github.com/HARSHALJETHWA19/

Twitter: https://twitter.com/harshaljethwaa

Thank You!!!

Please feel free to contact me on LinkedIn if you are unsure about anything or are having trouble understanding anything about the project.

AWSDockerKubernetesDevopsCloud