micronaut-multiple-services-kubernetes

Example of running multiple microservices talking to each other in Micronaut / Docker / Kubernetes

So the point of this example is demonstrating simpy how to:

• build a couple of Micronaut microservices
• package them in Docker images
• deploy them in a Kubernetes deployment
• have Kubnernetes set up DNS so the services can call each other

To run/test:

• run build.sh - this will build the Micronaut apps and create docker images
• run kubectl apply -f micronaut-multiple-services-kubernetes.yaml - this will
• curl localhost:8080/greetings | jq

Note that there are two microservices:

• 'name service' - GET /names returns a random name
• 'greeting service' - GET /greetings retrieves a random name from the name serivce and returns a greeting 'hello <random name>'

The Kubernetes deployment file (micronaut-multiple-services-kubernetes.yaml)

• deploys the services (with appropriate 'liveness' checks)
• sets up a LoadBalancer service for the greeting service, to expose it externally
• sets up a NodePort service for the name serivce, so the greeting service can call the name serivce via GET http://name-service-loadbalancer:8080/names (see NameServiceClient)

Please see this page for the relevant Kubernetes docs: https://kubernetes.io/docs/concepts/services-networking/connect-applications-service/