This repository contains sample inventory microservices to demonstrate how to use Spring, Kubernetes and Cassandra together a single stack.
- Cedrick Lunven - twitter handdle @clun
- Chris Splinter
- Frank Moley - twitter handle @fpmoles
microservice-spring-boot:- Persistence Layer : uses Cassandra Java driver's
CqlSessiondirectly for queries to products table - Exposition Layer : uses
spring-web@Controller
- Persistence Layer : uses Cassandra Java driver's
microservice-spring-data: Service for Orders table- Persistence Layer : uses Spring Data Cassandra for data access to orders table
- Exposition Layer : uses Spring Data Rest for API generation
Show a working set of microservices illustrating how to build Spring microservices with Kubernetes and Cassandra. This repo leverages Spring modules:
spring-dataspring-bootspring-data-restspring-webspring-cloud-kubernetesspring-cloud-gateway
The primary mode of deployment is on a local Kubernetes cluster, though each service can be run standalone or in Docker.
The purpose is to show the many utilities of Spring in Kubernetes with Cassandra as the backing storage tier.
The business domain is an inventory / ecommerce application.
The prerequisites required for this application to run
- Docker
- Kubernetes
- JDK 11+
- Maven
Clone the current repository
git clone <repo>
Start minikube
minikube start --driver=docker --extra-config=apiserver.authorization-mode=RBAC,Node
Create namespaces
kubectl create ns cass-operator
kubectl create ns spring-boot-service
kubectl create ns spring-data-service
Start the Cassandra operator
# create the storage class for the database
kubectl -n cass-operator apply -f deploy/storage-class.yml
# apply the operator manifest
kubectl -n cass-operator apply -f https://raw.githubusercontent.com/DataStax-Academy/kubernetes-workshop-online/master/1-cassandra/11-install-cass-operator-v1.1.yaml
# start a single C* 4.0 pod
kubectl -n cass-operator apply -f deploy/cassandra-4.0.0-1node.yml
Create the Kubernetes Secrets for database username and password
# get the username and password from the secret
kubectl -n cass-operator get secret cluster1-superuser -o yaml
# decode the username and password from the secret
echo <username> | base64 -D && echo ""
echo <password> | base64 -D && echo ""
# create k8s secrets for the services
kubectl -n spring-boot-service create secret generic db-secret --from-literal=username=<db-username> --from-literal=password=<db-password>
kubectl -n spring-data-service create secret generic db-secret --from-literal=username=<db-username> --from-literal=password=<db-password>
Build the Spring Boot service
# build jar
cd microservice-spring-boot; mvn package
# build docker image
docker build -t <your-docker-username>/spring-boot-service:1.0.0-SNAPSHOT .
# replace image name in deploy/spring-boot/spring-boot-deployment.yaml
# with your docker username
Build the Spring Data service
# build jar
cd microservice-spring-data; mvn package
# build docker image
docker build -t <your-docker-username>/spring-data-service:1.0.0-SNAPSHOT .
# replace image name in deploy/spring-data/spring-data-deployment.yaml
# with your docker username
Start the services
kubectl -n spring-boot-service apply -f deploy/spring-boot
kubectl -n spring-data-service apply -f deploy/spring-data
Expose the Spring Boot service endpoints
# get the spring-boot-service pod
kubectl -n spring-boot-service get pods
# forward the port
kubectl -n spring-boot-service port-forward <spring-boot-pod> 8083:8083
Expose the Spring Data service endpoints
# get the spring-data-service pod
kubectl -n spring-data-service get pods
# forward the port
kubectl -n spring-data-service port-forward <spring-data-pod> 8081:8081
Add products
curl -X POST -H "Content-Type: application/json" -d '{"name": "mobile", "id":"123e4567-e89b-12d3-a456-556642440000", "description":"iPhone", "price":"500.00"}' http://localhost:8083/api/products/add
curl -X POST -H "Content-Type: application/json" -d '{"name": "mobile", "id":"123e4567-e89b-12d3-a456-556642440001", "description":"Android", "price":"600.00"}' http://localhost:8083/api/products/add
Get products with name = mobile
curl http://localhost:8083/api/products/search/mobile
Get products with name = mobile and id = 123e4567-e89b-12d3-a456-556642440001
curl http://localhost:8083/api/products/search/mobile/123e4567-e89b-12d3-a456-556642440001
Delete product with name = mobile and id = 123e4567-e89b-12d3-a456-556642440001
curl -X DELETE http://localhost:8083/api/products/delete/mobile/123e4567-e89b-12d3-a456-556642440001
Add orders
curl -H "Content-Type: application/json" -d '{"key": {"orderId":"123e4567-e89b-12d3-a456-556642440000", "productId":"123e4567-e89b-12d3-a456-556642440000"}, "productName":"iPhone", "productPrice":"500.00", "productQuantity":1, "addedToOrderTimestamp": "2020-04-12T11:21:59.001+0000"}' http://localhost:8081/api/orders/add
curl -H "Content-Type: application/json" -d '{"key": {"orderId":"123e4567-e89b-12d3-a456-556642440000", "productId":"123e4567-e89b-12d3-a456-556642440001"}, "productName":"Android", "productPrice":"600.00", "productQuantity":1, "addedToOrderTimestamp": "2020-04-12T11:22:59.001+0000"}' http://localhost:8081/api/orders/add
Get orders with order_id = 123e4567-e89b-12d3-a456-556642440000
curl http://localhost:8081/api/orders/search/order-by-id?orderId=123e4567-e89b-12d3-a456-556642440000
Get order with order_id = 123e4567-e89b-12d3-a456-556642440000 and product_id = 123e4567-e89b-12d3-a456-556642440000
curl "http://localhost:8081/api/orders/search/order-by-product-id?orderId=123e4567-e89b-12d3-a456-556642440000&productId=123e4567-e89b-12d3-a456-556642440000"
Get only the product name and price of order_id = 123e4567-e89b-12d3-a456-556642440000
curl http://localhost:8081/api/orders/search/name-and-price-only?orderId=123e4567-e89b-12d3-a456-556642440000
Shows how to use a projection with Spring Data REST
curl "http://localhost:8081/api/orders/search/name-and-price-only?orderId=123e4567-e89b-12d3-a456-556642440000&projection=product-name-and-price"
Delete order with order_id = 123e4567-e89b-12d3-a456-556642440000 and product_id = 123e4567-e89b-12d3-a456-556642440000
curl -X DELETE "http://localhost:8081/api/orders/delete/product-from-order?orderId=123e4567-e89b-12d3-a456-556642440000&productId=123e4567-e89b-12d3-a456-556642440000"
Delete order with order_id = 123e4567-e89b-12d3-a456-556642440000
curl -X DELETE "http://localhost:8081/api/orders/delete/order?orderId=123e4567-e89b-12d3-a456-556642440000"```