spring-petclinic | A sample Spring-based application | Application Framework library

Your question totally makes sense.

Netflix OSS was developed in a period of time where Container orchestration's maturity was not the one we know nowadays. Today, with Kubernetes, services like EKS (for AWS, Kubernetes Engine for GCP, AKS for Azure) and a lot of new services and requirements, we have a lot more of stuff to deal with.

For instance, the first problem that the Netflix OSS solves, the Service Discovery, requires Eureka server. If we think at a IaaS world, it totally makes sense: we need a block, in our architecture, that knows about all the services in our system. If we think to a system that uses containers and orchestrators, such as Kubernetes, we realize that K8S already offers funcionalities like the one that Eureka offers. With this in mind, it results clear that adding a pod in our K8S cluster just to serve Eureka server would be a total waste of resources. We can then rely on the underlying platform.

With this consideration (and a lot more), Spring Cloud project has evolved, becoming more of a standardization incubator, with a lot of implementations. I'll give you some examples and I'll also give you a complete list of Netflix OSS equivalents:

• Eureka, for Service Discovery. We can use Kubernetes's API Server for this, so we can switch to Spring Cloud Kubernetes
• Hystrix, the Circuit Breaker. Spring Cloud Circuit Breaker is the new project for this. It is an abstraction, and can uses some implementations, such as Hystrix itself, but also Resilience4J, that I kindly suggest, or Sentinel
• Feign, as REST Client. There is a new implementation, outside the Netflix stack: Spring Cloud OpenFeign
• Ribbon, for a client side load balancing. You can switch to Spring Cloud LoadBalancer
• Config. This is pretty nice, because we have the Spring Cloud Config project, but if we add the Spring Cloud Kubernetes dependency we can also rely on K8S's ConfigMaps and Secrets for this, and Spring Cloud Config automatically uses them
• Zuul, the router and gateway. You can migrate to Spring Cloud Gateway, and it is already integrated with all the new projects

--EDIT--

Forgot to mention: when you are using a PaaS, you can stick to a lot of services. An example could be AWS API Gateway. Have a look at this page for a full list of Spring Cloud project. A lot of them adds support and integration to basically almost every PaaS.

I think your single biggest problem here is the VOLUME directive in the Dockerfile. The Dockerfile documentation for VOLUME notes:

Changing the volume from within the Dockerfile: If any build steps change the data within the volume after it has been declared, those changes will be discarded.

So when you declare a VOLUME for the directory containing the jar file, and then try to ADD content to it, it gets lost.

In most practical cases you don't need a VOLUME. You should be able to rewrite the Dockerfile to:

In your command please try the following -Dotel.traces.exporter=zipkin instead of -Dotel.exporter=zipkin

Change:

I used this solution How to enable H2 Database Server Mode in Spring Boot

Basically, it removes runtime scope from h2 dependency in pom.xml and starts the H2 as a Bean in the Spring Application.

Only extra thing is that I have to read the Spring starting log to find the message

Can you paste the Collector config file? It seems you are using the gRPC protocol and it's not supported on the system where the collector is running. https://github.com/open-telemetry/opentelemetry-collector/blob/master/exporter/otlpexporter/README.md

This is not really Docker, but Maven.

You are building your config-server/ project only (and here is when Docker is in the middle) but the "context" sent to Docker is just what's inside config-server/ and not the entire project. To build config-server/ you need the entire project because you are referring/using a parent POM.

You have not added spring-code dependency in your pom so you are getting java.lang.ClassNotFoundException on org.springframework.core try adding that