kong-k8s-springboot cleuton.sampaio (#13001)

Co-authored-by: cleutonsampaio <cleutonsampaio@cloud.upwork.com>

kubernetes-modules/kubernetes-spring/README.md

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+# Kong Ingress Controller with Spring Boot
+
+This project was generated from Spring Initializer Website (https://start.spring.io/): 
+
+Maven version Java latest: 
+```
+curl https://start.spring.io/starter.tgz -d dependencies=webflux,actuator -d type=maven-project | tar -xzvf -
+```
+
+Maven version Java 11: 
+```
+curl https://start.spring.io/starter.tgz -d dependencies=webflux,actuator -d type=maven-project -d javaVersion=11 | tar -xzvf -
+```
+
+## Steps to run the demonstration:
+
+1. Install minikube: https://www.baeldung.com/spring-boot-minikube
+
+2. Install Kong Ingress Controller on minikube: https://docs.konghq.com/kubernetes-ingress-controller/latest/deployment/minikube/
+- Test wich echo-server
+- Create environment variable: export PROXY_IP=$(minikube service -n kong kong-proxy --url | head -1)
+
+3. build that Spring boot service: 
+- Run ./mvnw install
+- Run jar: java -jar target/*.jar
+
+4. Create a Docker image: 
+If using minikube and don't want to push image to a repository, then point your local Docker client to Minikube's implementation: eval $(minikube -p minikube docker-env) --- use the same shell.
+- Run: ./mvnw spring-boot:build-image
+
+5. Deploy the application, create a service and an ingress rule: 
+```
+kubectl apply -f serviceDeployment.yaml
+kubectl apply -f clusterIp.yaml
+kubectl apply -f ingress-rule.yaml
+```
+
+6. Test access using the proxy IP: 
+```
+curl -i $PROXY_IP/actuator/health
+```
+
+## Setting up a rate limiter on your api
+
+7. Create a plugin: 
+
+kubectl apply -f rate-limiter.yaml
+
+8. Now test resource. Try more than 5 times a minute: 
+```
+curl -i $PROXY_IP/actuator/health
+```
+
+