ldw-sh-cn / spring-microservices-using-spring-kubernetes

Spring Microservice K8s

This sample application is to test spring apps service discovery with spring-cloud-kubernetes in K8 env. For other envs you can use Eureka(which is actually the default).

Build and Dockerize

mvn clean install -Ddocker

Build and Dockerize but Skip Docker Push

mvn clean install -Ddocker -Ddocker.skip.push

Endpoints

Gateway

Standard actuator endpoints

User service

• /user/public-address

and standard actuator endpoints

Contant Us service

• /contact-us/address
• /contact-us/hello

and standard actuator endpoints

Spring Cloud Kubernetes requires access to the Kubernetes API in order to be able to retrieve a list of addresses for pods running for a single service. If you use Kubernetes, you should just execute the following command:

kubectl create clusterrolebinding admin --clusterrole=cluster-admin --serviceaccount=default:default

This is only done for testing. In production, it can be something like - https://cloud.spring.io/spring-cloud-kubernetes/reference/html/#service-account

Properties required for K8

The properties required to switch from Eureka to K8s are:

        - name: EUREKA_CLIENT_ENABLED
          value: "false"
        - name: SPRING_CLOUD_KUBERNETES_ENABLED
          value: "true"
        - name: SPRING_CLOUD_KUBERNETES_RELOAD_ENABLED
          value: "true"
        - name: SPRING_AUTOCONFIGURE_EXCLUDE
          value: "org.springframework.cloud.netflix.eureka.loadbalancer.LoadBalancerEurekaAutoConfiguration"

Copy data.csv to the volume created

Google Cloud

Login to your google account using gcloud and then set the project and region. Then set the cluster using following command:

gcloud container clusters get-credentials spring-k8s

Then copy the file using following command

kubectl cp data.csv <namespace>/<pod-name>:/app/data

where /app/data is the mount path of the container.

NOTE: If you refer the official Google Documentation, you will notice that in ReadWriteMany access type, PersistentVolumes that are backed by Compute Engine persistent disks are not supported. There are alternative solutions for this like Google Filestore or Network File System(NFS).