server-app-h2

Server application

TODOs

• Implementation
• Metrics
• Tracing
• Swagger
• Docker multistage
• Kubernetes
  • manifests
  • implementation
    • service-discovery
    • configmap
    • secrets

---

Prerequisites

• Docker
• Minikube / Cloud Kubernetes cluster
• httpie
• jq

---

Build & run

• Locally

   mvnw clean spring-boot:run
  

• On Docker

   docker build . -t server-app-h2:latest
   docker run -d --name server-app-h2 \
   	-e SPRING_PROFILES_ACTIVE=docker \
   	-e HEAP_SIZE=256M \
   	-e META_SIZE=300M \
   	-p 8080:8080 -p 8090:8090 \
   	server-app-h2
   docker logs server-app-h2 -f
  

• On Kubernetes

   kubectl apply -f kube/configmap.yaml
   kubectl apply -f kube/secret.yaml
   kubectl apply -f kube/service.yaml
   kubectl apply -f kube/deployment.yaml
   kubectl apply -f kube/hor-pod-scale.yaml
  

---

API calls

Local / Docker

• Insert

   http POST :8080/users email="[email protected]" name="Matteo Baiguini" age=33
   http POST :8080/users email="[email protected]" name="John Doe" age=42
   http POST :8080/users email="[email protected]" name="Jane Doe" age=24
   http POST :8080/users email="[email protected]" name="Clint Eastwood" age=75
  

• Get

   http :8080/users
   http :8080/users/[email protected]
  

• Update

   USER_ID=$(http :8080/users/[email protected] | jq ".id")
   http PUT :8080/users id=$USER_ID email="[email protected]" name="Clint Eastwood" age=89
  

• Delete

   http DELETE :8080/users/[email protected]
   http DELETE :8080/users
  

Minikube

• Prepare env-vars

   SERVER_APP_HOST=$(minikube ip)
   SERVER_APP_PORT=$(k get svc | grep -i server-app | awk '{print $5}' | cut -d ',' -f 1 | sed 's,8080:,,' | sed 's,/TCP,,')
  

• Insert

   http POST $SERVER_APP_HOST:$SERVER_APP_PORT/users email="[email protected]" name="Matteo Baiguini" age=33
   http POST $SERVER_APP_HOST:$SERVER_APP_PORT/users email="[email protected]" name="John Doe" age=42
   http POST $SERVER_APP_HOST:$SERVER_APP_PORT/users email="[email protected]" name="Jane Doe" age=24
   http POST $SERVER_APP_HOST:$SERVER_APP_PORT/users email="[email protected]" name="Clint Eastwood" age=75
  

• Get

   http $SERVER_APP_HOST:$SERVER_APP_PORT/users
   http $SERVER_APP_HOST:$SERVER_APP_PORT/users/[email protected]
  

• Update

   USER_ID=$(http $SERVER_APP_HOST:$SERVER_APP_PORT/users/[email protected] | jq ".id")
   http PUT $SERVER_APP_HOST:$SERVER_APP_PORT/users id=$USER_ID email="[email protected]" name="Clint Eastwood" age=89
  

• Delete

   http DELETE $SERVER_APP_HOST:$SERVER_APP_PORT/users/[email protected]
   http DELETE $SERVER_APP_HOST:$SERVER_APP_PORT/users