junior / springboot-demo-k8s-mysql

SpringBoot Demo with MySQL running on Kubernetes

Springboot demo app

SpringBoot Demo with MySQL running on Kubernetes

Deploy to Kubernetes

Create namespace

kubectl create namespace demoapp

Default namespace to demoapp

kubectl config set-context --current --namespace=demoapp

Create MySQL Secrets

kubectl create secret generic mysql-secrets \
  --from-literal=rootpassword=r00tDefaultPassword1! \
  --from-literal=username=demo \
  --from-literal=password=defaultPassword1! \
  --from-literal=database=DB

Clone the repo if using OCI CloudShell or local

git clone https://github.com/junior/springboot-demo-k8s-mysql.git

cd springboot-demo-k8s-mysql/kubernetes

Deploy MySQL 8

Create PVC for MySQl on Oracle Cloud Infrastructure using CSI for Block Volume

kubectl apply -f mysql-pvc-oci-bv.yaml

Use mysql-pvc-manual.yaml if deploying local

Create Service for MySQL

kubectl apply -f mysql-svc.yaml

Create Deployment for MySQL

kubectl apply -f mysql-dep.yaml

Deploy the Spring Boot Demo App

Create Service for Demo App

Note: This step will create a new LoadBalancer on the infrastructure

kubectl apply -f app-svc.yaml

Create Deployment for Demo App

Note: The app will create the necessary tables on the MySQL on the first run

kubectl apply -f app-dep.yaml

Optional: Check logs

kubectl logs -l app=demoapp --follow

Optional: Insert Data to MySQL

Connect to mysql

kubectl run -it --rm --image=mysql:8 --restart=Never mysql-client -- mysql DB -h mysql -pr00tDefaultPassword1!

Press enter

If you don't see a command prompt, try pressing enter.

mysql>

insert into users (first_name, last_name) values ('joe', 'doe');

Expected results:

If you don't see a command prompt, try pressing enter.

mysql> insert into users (first_name, last_name) values ('joe', 'doe');
Query OK, 1 row affected (0.00 sec)

mysql> quit
Bye
pod "mysql-client" deleted

Optional: Test with port-forward

kubectl port-forward deploy/demoapp 8081:8081

Navigate to http://localhost:8081/users

Test with LoadBalancer IP Address

kubectl get svc

Navigate to http://<demoapp_EXTERNAL_IP_ADDRESS>/users

Create Horizontal Pod Autoscaler for Demo App

Install metrics server

kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml

Create autoscale for Demo App

kubectl autoscale deployment demoapp --cpu-percent=30 --min=1 --max=10

Check HPA

kubectl get hpa

Increase load

kubectl run -i --tty load-generator --rm --image=busybox --restart=Never -- /bin/sh -c "while sleep 0.01; do wget -q -O- http://demoapp/users; done"

Within a minute or so, we should see the higher CPU load by executing:

kubectl get hpa

Prometheus and Grafana

Install the grafana-prometheus stack

helm install prometheus prometheus-community/kube-prometheus-stack

get the grafana admin password

kubectl get secret prometheus-grafana \
 -o jsonpath="{.data.admin-password}" | base64 --decode ; echo

Test Grafana with port-forward

kubectl port-forward svc/prometheus-grafana 8085:80

Navigate to http://localhost:8085/

Build Demo App image

Skip this step if you just want to test the app on Kubernetes

docker build --pull --no-cache --squash --rm --progress plain -f Dockerfile -t sbdemo .