Prometheus

Prerequisites

• Longhorn
• Flux

Prometheus

Prometheus is an open-source monitoring and alerting toolkit designed for reliability and scalability.

Installation

1. Create the following directory structure for Prometheus:

   prometheus/
   ├── helmrelease.yml
   ├── helmrepository.yml
   └── pvc.yml

2. Add the following content to the helmrepository.yml file:

   ---
   apiVersion: source.toolkit.fluxcd.io/v1
   kind: HelmRepository
   metadata:
     name: prometheus-community
     namespace: flux-system
   spec:
     interval: 6h
     url: https://prometheus-community.github.io/helm-charts

3. Add the following content to the helmrelease.yml file:

   ---
   apiVersion: helm.toolkit.fluxcd.io/v2
   kind: HelmRelease
   metadata:
     name: prometheus
     namespace: monitoring
   spec:
     interval: 6h
     chart:
       spec:
         chart: prometheus
         version: "28.9.1"
         sourceRef:
           kind: HelmRepository
           name: prometheus-community
           namespace: flux-system
         interval: 6h
     values:
       server:
         persistentVolume:
           enabled: true
           existingClaim: prometheus-longhorn
         retention: "2d"
         retentionSize: "4GB"

4. Add the following content to the pvc.yml file:

   ---
   apiVersion: v1
   kind: PersistentVolumeClaim
   metadata:
     name: prometheus-longhorn
     namespace: monitoring
   spec:
     accessModes:
       - ReadWriteOnce
     resources:
       requests:
         storage: 10Gi
     storageClassName: longhorn

5. Commit and push the changes to your git repository. Flux will deploy Prometheus to your cluster.