Monitor applications using Prometheus Operator on Kubernetessunday, february 24, 2019
You can make the Prometheus configuration aware of the Kubernetes environment your applications are running in. I’ve described how to do that manually, in a previous blog post. Prometheus Operator is an extension to Kubernetes that manages Prometheus monitoring instances in a more automated and effective way.
Prometheus Operator allows you to define and manage monitoring instances as Kubernetes resources. If you know how to manage Kubernetes, there’s a low threshold to get started and effectively define the monitoring of your applications.
In order to enable our Kubernetes for Prometheus operators, we setup the resource and RBAC definitions that you can find here.
This enhances our cluster with more Kubernetes resources types, such as
Similarly, you can use the Prometheus Operator helm chart.
We define the operators of our
config-example application, similar to the previous post:
apiVersion: monitoring.coreos.com/v1 kind: ServiceMonitor metadata: name: config-example labels: team: example spec: selector: matchLabels: app: config-example endpoints: - basicAuth: password: name: basic-auth key: password username: name: basic-auth key: username port: https scheme: https path: '/metrics/' tlsConfig: insecureSkipVerify: true
apiVersion: monitoring.coreos.com/v1 kind: Prometheus metadata: name: prometheus spec: serviceAccountName: prometheus serviceMonitorSelector: matchLabels: team: example resources: requests: memory: 400Mi
apiVersion: v1 kind: Service metadata: name: prometheus spec: ports: - port: 9090 name: http selector: prometheus: prometheus
apiVersion: v1 kind: Secret metadata: name: basic-auth data: password: YWRtaW5hZG1pbg== username: YWRtaW4=
This sets up a prometheus instance, that will scrape applications that are deployed with the
app: config-example label using the provided configuration to access it.
It also creates a
prometheus service to access the monitoring instances.
You can find a full description of the Prometheus Operator API in the documentation.
After we applied all resources, we can see the running monitoring instances in our cluster:
$> kubectl get pods NAME READY STATUS RESTARTS AGE config-example-7db586bb95-jdmsx 1/1 Running 0 12m config-example-7db586bb95-z4ln8 1/1 Running 0 12m [...] prometheus-prometheus-0 3/3 Running 0 14m
This enables us to simply monitor all application instances without manually configuring the Prometheus instances.
Have a look at the full example on GitHub (
Found the post useful? Subscribe to my newsletter for more free content, tips and tricks on IT & Java: