run these commands:

cd /opt/terraform/k3s/helm/
mkdir prometheus
cd /opt/terraform/k3s/helm/prometheus

Create providers.tf file:

nano providers.tf

Put this in the file:

provider "kubernetes" {
  # Configuration options
  config_path = "/etc/rancher/k3s/k3s.yaml"
  config_context = "default"
}

provider "helm" {
  kubernetes {
        config_path = "/etc/rancher/k3s/k3s.yaml"
        config_context = "default"
    }
}

Create namespaces.tf file:

nano namespaces.tf

put this into the file

resource "kubernetes_namespace" "mysql_ns" {
  metadata {
    name = "my-prometheus"
  }
}

Create file prometheus.tf

nano prometheus.tf

Put this in the file:

esource "helm_release" "prometheus" {
  chart      = "prometheus"
  name       = "prometheus"
  namespace  = "my-prometheus"
  repository = "https://prometheus-community.github.io/helm-charts"
  version    = "15.5.3"

  set {
    name  = "podSecurityPolicy.enabled"
    value = false
  }

  set {
    name  = "server.persistentVolume.enabled"
    value = false
  }

}

Run these commands

terraform init
terraform plan 
terraform apply

kubectl get namespaces

kubectl get all -o wide -n my-prometheus

kubectl get service -o wide -n my-prometheus

curl 10.43.26.51

curl 10.43.217.6:8080

curl 10.43.94.230:9091

# cleanup
terraform destroy

Bibliography

https://getbetterdevops.io/terraform-with-helm/