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service-simple-rest

README.md

Simple stateless REST service

This is simple demo of stateless REST service. it responds to simple GET requests.

Build and run

Build and run on local machine.

gradle clean build 
java -jar build/libs/service-simple-rest-1.0.0-SNAPSHOT.jar

Build Docker image

docker build . -t service-simple-rest:1.0.0-SNAPSHOT
docker image list
docker save --output="build/service-simple-rest:1.0.0-SNAPSHOT.tar" service-simple-rest:1.0.0-SNAPSHOT
docker image rm -f <imageid>
docker run -p 8888:8080 service-simple-rest:1.0.0-SNAPSHOT

k8s deployment

deployment K8s deploy sequence:

kubectl apply -f service-simple-rest-deployment.yaml
kubectl logs service-simple-rest-<podId>

This deploys two instances of REST service behind single load balancer. Load-balanced service is accessible master kubernetes node using URL:

for i in {1..1000}; do
   curl -X GET http://<kube-master>:30081/data/info
   echo ""
done

K8s undeploy sequence:

kubectl delete service/service-simple-rest
kubectl delete deployment.apps/service-simple-rest

Scale up deployment:

kubectl scale deployment simple-rest --replicas=5

Scale down deployment:

kubectl scale deployment simple-rest --replicas=2

REST endpoints

  • GET http://hostname:port/data/info
  • GET http://hostname:port//data/compute/pi/{precision}
curl -X GET http://localhost:8080/data/info
curl -X GET http://localhost:8080/data/compute/pi/{precision}

where precision is in range 0 .. 10, 10 is max. precision