dipanjal / spring-boot-kubernetes-goto-cph-2021

Cloud Native with Spring Boot and Kubernetes (GOTO Copenhagen 2021)

Source code and examples from my presentation "Cloud Native with Spring Boot and Kubernetes" at Devoxx UK 2021

Demonstration of:

• Cloud native development with Spring Boot and Reactive Spring
• Containerization with Cloud Native Buildpacks
• Kubernetes deployment manifests, graceful shutdown, and health probes
• Spring Boot configuration through ConfigMaps
• Native executables with Spring Native and GraalVM
• Serverless applications on Knative

Conference Session

Prerequisites

To run all the examples, you need to install the following tools:

• Java 17
• Docker
• Kubernetes CLI
• kind

Recommended tools:

• Octant
• Knative CLI

Usage

Both Spring Boot applications can be run locally with this command:

$ ./gradlew bootRun

You can containerize them via Buildpacks. Demo Service will be containerized as a JVM image, whereas Demo Native will be containerized as a Native image.

$ ./gradlew bootBuildImage

Deployment on a local Kubernetes cluster

You can spin up a Kubernetes cluster as follows:

$ ./kind/create-cluster.sh

Then, deploy Demo Service with kubectl:

$ kubectl apply demo-service/k8s

When you're done, you can destroy the cluster as follows:

$ ./kind/destroy-cluster.sh

Deployment on a local Kubernetes cluster with Knative

You can spin up a Kubernetes cluster with Knative as follows:

$ ./kind/install-knative.sh

Then, deploy Demo Native with kubectl:

$ kubectl apply demo-service/knative

When you're done, you can uninstall the cluster as follows:

$ ./kind/uninstall-knative.sh

Other

If you're looking for an open-source Kubernetes-based platform, you might want to try [https://tanzucommunityedition.io](VMware Tanzu Community Edition), which is the one I used for the presentation.