Prometheus Agent Operator

Requirements

Before starting, ensure you have a Kubernetes cluster with administrative privileges.

Operator Installation

Begin by installing the Custom Resource Definitions (CRDs) and the operator itself, along with the necessary RBAC resources.

Execute the following commands to download the CRDs and set up the operator in the last9-monitoring namespace:

LATEST=$(curl -s "https://api.github.com/repos/prometheus-operator/prometheus-operator/releases/latest" | jq -cr .tag_name)
curl -sL "https://github.com/prometheus-operator/prometheus-operator/releases/download/${LATEST}/bundle.yaml" > ./bundle.yaml

sed -i '' 's/namespace: default/namespace: last9-monitoring/g' bundle.yaml

kubectl create -f ./namespace.yaml -f ./bundle.yaml

Note: If CRDs are already present then it wont override it and instead it will state that the CRDs exists.

The operator might take a few minutes to become fully operational. Monitor its status using this command:

kubectl wait --for=condition=Ready pods -l  app.kubernetes.io/name=prometheus-operator -n last9-monitoring

The Prometheus Operator enables the declaration of desired states for Prometheus and Alertmanager clusters, as well as the Prometheus configuration through custom resources. In this guide, we focus on the following resources:

• Prometheus
• ServiceMonitor
• PodMonitor

Here, the Prometheus resource specifies the desired setup for a Prometheus instance, while the ServiceMonitor and PodMonitor resources identify the monitoring targets for Prometheus.

Secrets

Generate your secrets in the secret.yaml file by converting them into base64 encoded strings

Prometheus Agent Installation

Commands

Check prometheus-agent.yaml for any placeholder values and replace them with correct values.

kubectl apply -f ./prometheus-agent.yaml -f ./secret.yaml --kubeconfig=$KUBECONFIG -n last9-monitoring

Verification

To verify that the instance is up and running, run:

kubectl get pods -n last9-monitoring

Service Monitor Installation

Commands

kubectl apply -f ./service-monitor.yaml --kubeconfig=$KUBECONFIG -n last9-monitoring

Verification

To verify that the service monitors are up and running, run:

kubectl get servicemonitor --kubeconfig=$KUBECONFIG -n last9-monitoring

Quick Installation Tutorial