Prometheus Demo

This is a demo app to feed Prometheus with some data.

It uses information about the International Space Station (ISS, acquired through the "Where the ISS at?" REST API) and about the weather on Mars (acquired through the MAAS2 API, but originating from the Curiosity Rover) to generate Metrics which can be scraped by a Prometheus instance.

There are two (functionally near identical) implementations using different Java frameworks:

• Quarkus
• Spring Boot

Quarkus

Execute the following from the ./quarkus directory (using JDK 11 and Maven 3.8.1+) to build & publish the Quarkus implementation:

Build Native image (runnable application):

$ mvn -Pnative -Dquarkus.native.container-build=true package

Build Native app & Container image:

$ mvn -Pnative -Dquarkus.native.container-build=true -Dquarkus.container-image.build=true package

Build Native app & Container image and publish it to the Docker Hub:

$ mvn -Pnative -Dquarkus.native.container-build=true -Dquarkus.container-image.build=true -Dquarkus.container-image.push=true package

NOTE: Adapt the image group name and set the corresponding credentials in the config before attempting to publish the image:

$ grep container src/main/resources/application.properties | grep -v jib
quarkus.container-image.group=<GROUP-NAME>
quarkus.container-image.name=prometheus-demo-quarkus
quarkus.container-image.username=<DOCKER-HUB-USERNAME>
quarkus.container-image.password=<DOCKER-HUB-PASSWORD>

Alternatively, the credentials can also be provided as parameters for the mvn command: -Dquarkus.container-image.password=<DOCKER-HUB-PASSWORD>

Spring Boot

Execute the following from the ./springboot directory (using JDK 11 and Maven 3.8.1+) to build & publish the Spring Boot implementation:

Build Native container image:

$ mvn spring-boot:build-image

To push the image to the Docker Hub, tag it with the correct Group Name and push it:

$ docker image tag prometheus-demo-springboot:latest <GROUP-NAME>/prometheus-demo-springboot:latest
$ docker image push <GROUP-NAME>/prometheus-demo-springboot:latest

NOTE: Make sure you are logged into your Docker account before attempting to push the image (i.e. using docker login).