k8s-Social-Network

In this project we will deploy a Stateful app (Social-Network) built with Spring Boot, MySql, and React on Kubernetes. We’ll use a local minikube cluster to deploy the application.

The project contains three deployment files:

• mysql-deployment.yaml - deploys the MySql-database
• social-network-server.yaml - deploys the server of the app
• social-network-client.yaml - deploys the client of the app

Requirements

1. Install kubectl

2. Install minikube

3. In order to be able to save Photos you should sign up to Cloudinary

Deploying Mysql on Kubernetes using PersistentVolume and Secrets

Starting a Minikube cluster

$ minikube start

Creating the secrets

Create the secrets manually:

$ kubectl create secret generic mysql-root-pass --from-literal=password=root

$ kubectl create secret generic mysql-user-pass --from-literal=username=root --from-literal=password=root

$ kubectl create secret generic mysql-db-url --from-literal=database=social_network --from-literal=url="jdbc:mysql://social-network-mysql:3306/social_network?useSSL=false&createDatabaseIfNotExist=true&serverTimezone=UTC"

$ kubectl create secret generic cloudinary-credentials --from-literal=cloud-name=<enter_your_cloud_name> --from-literal=api-key=<enter_your_api_key> --from-literal=api-secret=<enter_your_api_secret>

Get all secrets:

$ kubectl get secrets

Get more information about a secret:

$ kubectl describe secrets mysql-user-pass

Deploying MySQL

To deploy the database type:

$ kubectl apply -f deployments/mysql-deployment.yaml

You can check all the resources created in the cluster using the following commands:

$ kubectl get persistentvolumes

$ kubectl get persistentvolumeclaims

$ kubectl get services

$ kubectl get deployments

Logging into the MySQL pod

You can get the MySQL pod and use kubectl exec command to login to the Pod

$ kubectl get pods
NAME                                        READY   STATUS    RESTARTS   AGE
social-network-app-mysql-67cf984757-9pjs6   1/1     Running   0          6m1s

$ kubectl exec -it social-network-app-mysql-67cf984757-9pjs6 -- /bin/bash
root@social-network-app-mysql-67cf984757-9pjs6:/#

Deploying the Spring Boot app on Kubernetes

Apply the manifest file to create the resources:

$ kubectl apply -f deployments/social-network-server.yaml

You can check the created Pods like this:

$ kubectl get pods
NAME                                        READY   STATUS    RESTARTS   AGE
social-network-app-mysql-67cf984757-9pjs6   1/1     Running   0          31m
social-network-server-756dc94cf6-b2ghs      1/1     Running   0          111s

Deploying the React app on Kubernetes

Apply the manifest file to deploy the frontend:

$ kubectl apply -f deployments/social-network-client.yaml

Open the application:

You need to map localhost:8000 to port 8000 on the backend service:

kubectl port-forward service/social-network-server 8000:8000

Type the following command to open the frontend service in the default browser:

minikube service social-network-client

App screenshots

1. Home Page

2. Friends Page

3. Photos Page