feat: prometheus/grafana with longhorn

Author: lorenzocorallo

main.tf

@@ -103,10 +103,6 @@ module "monitoring" {
   cluster_monitoring_telegram_token = data.azurerm_key_vault_secret.cluster_monitoring_telegram_token.value
 
   grafana_admin_password      = data.azurerm_key_vault_secret.grafana_admin_password.value
-  persistent_storage          = true
-  persistent_storage_size_gi  = "10"
-  persistent_storage_location = azurerm_resource_group.rg.location
-  persistent_storage_rg_name  = azurerm_resource_group.rg.name
 }
 
 module "bot_mod_prod" {

modules/monitoring/main.tf

@@ -30,56 +30,3 @@ resource "helm_release" "prometheus-stack" {
     kubernetes_persistent_volume_claim.storage_pvc
   ]
 }
-
-resource "azurerm_managed_disk" "storage" {
-  count                = var.persistent_storage ? 1 : 0
-  name                 = "md-polinetwork-${random_uuid.volume.result}"
-  location             = var.persistent_storage_location
-  resource_group_name  = var.persistent_storage_rg_name
-  storage_account_type = "Standard_LRS"
-  create_option        = "Empty"
-  disk_size_gb         = var.persistent_storage_size_gi
-}
-
-resource "kubernetes_persistent_volume" "storage" {
-  count = var.persistent_storage ? 1 : 0
-
-  metadata {
-    name = "${random_uuid.volume.result}-grafana-pv"
-  }
-  spec {
-    capacity = {
-      storage = "${var.persistent_storage_size_gi}Gi"
-    }
-    storage_class_name = "managed-csi"
-    access_modes       = ["ReadWriteOnce"]
-    persistent_volume_source {
-      csi {
-        driver        = "disk.csi.azure.com"
-        volume_handle = azurerm_managed_disk.storage[0].id
-      }
-    }
-  }
-
-  depends_on = [
-    azurerm_managed_disk.storage
-  ]
-}
-
-resource "kubernetes_persistent_volume_claim" "storage_pvc" {
-  count = var.persistent_storage ? 1 : 0
-  metadata {
-    name      = "grafana-pvc"
-    namespace = var.namespace
-  }
-  spec {
-    access_modes       = ["ReadWriteOnce"]
-    storage_class_name = "managed-csi"
-    resources {
-      requests = {
-        storage = "${var.persistent_storage_size_gi}Gi"
-      }
-    }
-    volume_name = kubernetes_persistent_volume.storage[0].metadata[0].name
-  }
-}

modules/monitoring/values/grafana.yaml.tftpl

@@ -25,25 +25,28 @@ grafana:
   persistence:
     enabled: true
     type: pvc
-    existingClaim: grafana-pvc
+    storageClassName: "longhorn-static"
+    accessModes:
+      - ReadWriteOnce
+    size: 5Gi
 
 prometheus:
   prometheusSpec:
-    retention: 5d
+    retention: 30d
     storageSpec:
       volumeClaimTemplate:
         spec:
-          storageClassName: managed-csi
+          storageClassName: longhorn-static
           accessModes:
             - ReadWriteOnce
           resources:
             requests:
-              storage: 32Gi
+              storage: 12Gi
     resources:
       limits:
-        memory: 1500Mi
-      requests:
         memory: 700Mi
+      requests:
+        memory: 100Mi
 
 alertmanager:
   config:

modules/monitoring/variables.tf

@@ -1,30 +1,8 @@
-variable "persistent_storage" {
-  type        = bool
-  description = "Volume claim for the bot"
-  default     = false
-}
-
 variable "grafana_admin_password" {
   type      = string
   sensitive = true
 }
 
-variable "persistent_storage_location" {
-  type    = string
-  default = ""
-}
-
-variable "persistent_storage_rg_name" {
-  type    = string
-  default = ""
-}
-
-variable "persistent_storage_size_gi" {
-  type        = string
-  description = "Requested storage"
-  default     = ""
-}
-
 variable "namespace" {
   type        = string
   description = "Grafana namespace"
@@ -36,4 +14,4 @@ variable "cluster_monitoring_app_password" {
 
 variable "cluster_monitoring_telegram_token" {
   type = string
-}
+}