In kubernetes (k8s) we can monitor our spring boot services and gain insights on it with Prometheus and Grafana.

Continuing on from our previous post, Spring Data REST on Kubernetes. We add the following dependency to the vadal-data-rest service pom.xml.

<!-- Micrometer Prometheus registry  -->
<dependency>
    <groupId>io.micrometer</groupId>
    <artifactId>micrometer-registry-prometheus</artifactId>
</dependency>

Build and Deploy the image to k8s

mvn spring-boot:build-image

there should be an update to the docker image

docker images

vadal-data-rest 0.0.1-SNAPSHOT

Tell k8s to update the image in the pod:

kubectl patch deploy vadal-data-rest -p ‘{“spec”:{“template”:{“spec”:{“terminationGracePeriodSeconds”:29}}}}’

Prometheus

Delete any older installation.

helm del — purge prometheus

Install it.

helm install — wait — name prometheus — set service.type=NodePort,service.nodePort=9090 stable/prometheus

Note the local cluster url, prometheus-server.default.svc.cluster.local, we will need this to connect grafana to it.

Make it available on port 30001

kubectl edit svc/prometheus-server

and change the nodePort to 30001

#grafana #prometheus #spring-boot #spring