Spring Boot Docker Example
This is an example Spring Boot "Hello World" micro-service application that can be containerized and subsequently executed in Docker, Kubernetes, and Google App Engine!
This is not an official Google product.
Building
Regular Maven build:
mvn package
Build Docker container:
mvn docker:build
Running
Java
Pretty straight forward:
mvn exec:java
Docker
Without Redis for session:
docker run -ti spring-boot-demo
With Redis for session:
docker run -d --name redis -p 6379:6379 redis
docker run -ti --rm --link redis:redis -p 8080:8080 spring-boot-demo
Docker Compose
Docker Compose uses a descriptor to describe the Docker container and linking configurations. Rather than manually executing commands like the previous section, you can start the demo with Redis by running:
cd src/test/docker-compose
docker-compose up
The configuration is stored in docker-compose.yml
Kubernetes
The following instructions assume that you already have Kubernetes cluster up and running. If not, check out Google Container Engine to get started quickly.
Change directory to where all the Kubernetes configuration files are:
cd src/test/kubernetes
Deploy Redis master pod:
kubectl create -f redis-master-pod.yaml
Create a Redis master service:
kubectl create -f redis-master-service.yaml
Deploy Spring Boot Demo replication controller:
kubectl create -f spring-boot-demo-controller.yaml
Create a service:
kubectl create -f spring-boot-demo-service.yaml
If you are on Google Container Engine, or Kubernetes deployment that supports external services, you can create an external service:
kubectl create -f spring-boot-demo-external-service.yaml
Google App Engine
The instruction assumes that you have Google Cloud SDK already installed and that you are familiar with Google App Engine Managed VMs.
To run locally:
mvn gcloud:run
To deploy into Google App Engine, you'll first need to create a Redis server. You can deploy Redis easily by using Click to Deploy.
Once deployed, update src/main/resources/application-gae.properties file, and set:
spring.redis.host=YOUR_REDIS_MASTER_INSTANCE_NAME
Build the Docker image, so that it generates Dockerfile
mvn docker:build
Finally, deploy the application using gcloud plugin:
mvn gcloud:deploy -Dgcloud.project=YOUR_PROJECT_ID