keeplearningandtrying/kubernetes-native-java-with-spring-boot

Kubernetes Native Java with Spring Boot

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 Boot 3 and GraalVM
• Serverless applications on Knative

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. Book Service will be containerized as a JVM image, whereas Book 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 Book Service with kubectl:

$ kubectl apply demo-service/config

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 Book Native with kubectl:

$ kubectl apply demo-service/knative