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https://github.com/junior/springboot-demo-k8s-mysql
SpringBoot Demo with MySQL running on Kubernetes
https://github.com/junior/springboot-demo-k8s-mysql
autoscaling grafana hpa kubernetes mysql mysql8 springboot springboot-demo
Last synced: 3 days ago
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SpringBoot Demo with MySQL running on Kubernetes
- Host: GitHub
- URL: https://github.com/junior/springboot-demo-k8s-mysql
- Owner: junior
- License: upl-1.0
- Created: 2021-02-19T05:31:55.000Z (over 3 years ago)
- Default Branch: main
- Last Pushed: 2021-02-21T04:23:54.000Z (over 3 years ago)
- Last Synced: 2024-04-24T12:18:30.842Z (7 months ago)
- Topics: autoscaling, grafana, hpa, kubernetes, mysql, mysql8, springboot, springboot-demo
- Language: Java
- Homepage:
- Size: 48.8 KB
- Stars: 4
- Watchers: 3
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# Springboot demo app
SpringBoot Demo with MySQL running on Kubernetes
## Deploy to Kubernetes
### Create namespace
```shell
kubectl create namespace demoapp
```
### Default namespace to demoapp
```shell
kubectl config set-context --current --namespace=demoapp
```
### Create MySQL Secrets
```shell
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
```shell
git clone https://github.com/junior/springboot-demo-k8s-mysql.git
```
```shell
cd springboot-demo-k8s-mysql/kubernetes
```
### Deploy MySQL 8
#### Create PVC for MySQl on Oracle Cloud Infrastructure using CSI for Block Volume
```shell
kubectl apply -f mysql-pvc-oci-bv.yaml
```
> Use mysql-pvc-manual.yaml if deploying local
#### Create Service for MySQL
```shell
kubectl apply -f mysql-svc.yaml
```
#### Create Deployment for MySQL
```shell
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
```shell
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
```shell
kubectl apply -f app-dep.yaml
```
#### Optional: Check logs
```shell
kubectl logs -l app=demoapp --follow
```
#### Optional: Insert Data to MySQL
##### Connect to mysql
```shell
kubectl run -it --rm --image=mysql:8 --restart=Never mysql-client -- mysql DB -h mysql -pr00tDefaultPassword1!
```
Press enter
```shell
If you don't see a command prompt, try pressing enter.
mysql>
```
```sql
insert into users (first_name, last_name) values ('joe', 'doe');
```
Expected results:
```shell
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
```shell
kubectl port-forward deploy/demoapp 8081:8081
```
Navigate to http://localhost:8081/users
#### Test with LoadBalancer IP Address
```shell
kubectl get svc
```
Navigate to http:///users
## Create Horizontal Pod Autoscaler for Demo App
### Install metrics server
```shell
kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml
```
### Create autoscale for Demo App
```shell
kubectl autoscale deployment demoapp --cpu-percent=30 --min=1 --max=10
```
### Check HPA
```shell
kubectl get hpa
```
### Increase load
```shell
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:
```shell
kubectl get hpa
```
## Prometheus and Grafana
### Install the grafana-prometheus stack
```shell
helm install prometheus prometheus-community/kube-prometheus-stack
```
### get the grafana admin password
```shell
kubectl get secret prometheus-grafana \
-o jsonpath="{.data.admin-password}" | base64 --decode ; echo
```
### Test Grafana with port-forward
```shell
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
```shell
docker build --pull --no-cache --squash --rm --progress plain -f Dockerfile -t sbdemo .
```