Installing Elasticsearch inside a Kubernetes cluster with Helm and Te…

…rraform

1-helm-installation.tf

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+resource kubernetes_cluster_role_binding "tiller-crb" {
+  metadata {
+    name = "tiller-crb"
+  }
+
+  role_ref {
+    api_group = "rbac.authorization.k8s.io"
+    kind = "ClusterRole"
+    name = "cluster-admin"
+  }
+
+  subject {
+    kind = "ServiceAccount"
+    name = "tiller"
+    namespace = "kube-system"
+  }
+}
+
+resource kubernetes_service_account "tiller" {
+  depends_on = [kubernetes_cluster_role_binding.tiller-crb]
+  metadata {
+    name = "tiller"
+    namespace = "kube-system"
+  }
+}

2-elasticsearch-installation.tf

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+provider "helm" {
+  kubernetes {
+    config_path = var.kubeconfig_file_path
+  }
+  version = "~> 0.10.4"
+  service_account = kubernetes_service_account.tiller.metadata[0].name
+  install_tiller = true
+}
+
+data "helm_repository" "stable" {
+  name = "elastic"
+  url  = "https://helm.elastic.co"
+}
+
+resource helm_release "elasticsearch_master" {
+  name       = "elasticsearch-master"
+  repository = data.helm_repository.stable.metadata[0].name
+  chart      = "elasticsearch"
+  version    = "7.6.1"
+  timeout    = 900
+
+  values = [
+    <<RAW_VALUES
+volumeClaimTemplate:
+  accessModes: [ "ReadWriteOnce" ]
+  storageClassName: "alicloud-disk-ssd"
+  resources:
+    requests:
+      storage: ${var.elasticsearch.master_node.volume_size}Gi
+resources:
+  requests:
+    cpu: ${var.elasticsearch.master_node.cpu}
+    memory: ${var.elasticsearch.data_node.memory}Gi
+roles:
+  master: "true"
+  ingest: "false"
+  data: "false"
+RAW_VALUES
+  ]
+
+  set {
+    name = "imageTag"
+    value = "7.6.2"
+  }
+
+  set {
+    name = "clusterName"
+    value = "elasticsearch-cluster"
+  }
+
+  set {
+    name = "nodeGroup"
+    value = "master"
+  }
+}
+
+resource helm_release "elasticsearch_data" {
+  name       = "elasticsearch-data"
+  repository = data.helm_repository.stable.metadata[0].name
+  chart      = "elasticsearch"
+  version    = "7.6.1"
+  timeout    = 900
+
+  values = [
+    <<RAW_VALUES
+volumeClaimTemplate:
+  accessModes: [ "ReadWriteOnce" ]
+  storageClassName: "alicloud-disk-ssd"
+  resources:
+    requests:
+      storage: ${var.elasticsearch.data_node.volume_size}Gi
+resources:
+  requests:
+    cpu: ${var.elasticsearch.data_node.cpu}
+    memory: ${var.elasticsearch.data_node.memory}Gi
+roles:
+  master: "false"
+  ingest: "true"
+  data: "true"
+RAW_VALUES
+  ]
+
+  set {
+    name = "imageTag"
+    value = "7.6.2"
+  }
+
+  set {
+    name = "clusterName"
+    value = "elasticsearch-cluster"
+  }
+
+  set {
+    name = "nodeGroup"
+    value = "data"
+  }
+}

variables.tf

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+variable "elasticsearch" {
+  type = object({
+    master_node = object({
+      volume_size = number
+      cpu = number
+      memory = number
+    })
+
+    data_node = object({
+      volume_size = number
+      cpu = number
+      memory = number
+    })
+  })
+}
+
+variable "kubeconfig_file_path" {
+  type = string
+  default = "/my/file/path"
+}