[GH-11] introduce argo installation

README.md

@@ -38,5 +38,12 @@ module "k8s" {
   # writes the kubeconfig to the local filesystem
   path_to_kubeconfig         = "/full/path/to/.kube"
   use_cluster_name_in_config = true
+
+  cluster_addons = {
+    argo = {
+      enabled = true
+      most_recent = true
+    }
+  }
 }
 ```

main.tf

@@ -17,7 +17,7 @@ data "digitalocean_kubernetes_versions" "version" {
   version_prefix = var.cluster_version_prefix
 }
 
-resource "digitalocean_kubernetes_cluster" "cluster" {
+resource "digitalocean_kubernetes_cluster" "this" {
   name    = local.cluster_name
   region  = var.cluster_region
   version = data.digitalocean_kubernetes_versions.version.latest_version
@@ -45,6 +45,28 @@ resource "digitalocean_vpc" "vpc" {
 resource "local_sensitive_file" "kubeconfig" {
   count = local.create_kubeconfig ? 1 : 0
 
-  content  = digitalocean_kubernetes_cluster.cluster.kube_config[0].raw_config
+  content  = digitalocean_kubernetes_cluster.this.kube_config[0].raw_config
   filename = local.full_path_to_kubeconfig
+
+  depends_on = [
+    digitalocean_kubernetes_cluster.this
+  ]
+}
+
+module "cluster_addons" {
+  source = "./modules/cluster-addons"
+
+  # The module must be dependant on the kubeconfig creation. We pass these values to the module
+  # so that it can use them to configure the cluster addons
+  full_path_to_kubeconfig = local_sensitive_file.kubeconfig[0].filename
+  cluster_id              = digitalocean_kubernetes_cluster.this.id
+
+  # Cluster Addons Configuration
+  cluster_addons = var.cluster_addons
+
+  providers = {
+    kubernetes = kubernetes.default
+    helm       = helm.default
+    null       = null.default
+  }
 }

modules/cluster-addons/argo.tf

@@ -0,0 +1,60 @@
+locals {
+  argo_config        = lookup(var.cluster_addons, "argo", null)
+  argo_enabled       = local.argo_config != null ? lookup(local.argo_config, "enabled", false) : false
+  argo_chart_version = local.argo_config != null ? lookup(local.argo_config, "chart_version", null) : null
+  namespace          = "argo"
+}
+
+resource "null_resource" "kubeconfig" {
+  count = local.argo_enabled ? 1 : 0
+
+  provisioner "local-exec" {
+    command = "until [ -f ${var.full_path_to_kubeconfig} ]; do sleep 0.5; done"
+  }
+}
+
+resource "null_resource" "kubectl_get_all" {
+  count = local.argo_enabled ? 1 : 0
+
+  provisioner "local-exec" {
+    command = "kubectl get all -A; while [ $? -ne 0 ]; do kubectl get all -A; done"
+  }
+
+  depends_on = [
+    null_resource.kubeconfig
+  ]
+}
+
+resource "kubernetes_namespace" "argo" {
+  count = local.argo_enabled ? 1 : 0
+
+  metadata {
+    name = local.namespace
+  }
+
+  depends_on = [
+    null_resource.kubeconfig,
+    null_resource.kubectl_get_all
+  ]
+}
+
+resource "helm_release" "argo" {
+  count = local.argo_enabled ? 1 : 0
+
+  name       = "argo"
+  namespace  = local.namespace
+  repository = "https://argoproj.github.io/argo-helm"
+  chart      = "argo-cd"
+  version    = local.argo_chart_version
+
+  set {
+    name  = "crds.install"
+    value = "true"
+  }
+
+  depends_on = [
+    kubernetes_namespace.argo,
+    null_resource.kubeconfig,
+    null_resource.kubectl_get_all
+  ]
+}

modules/cluster-addons/main.tf

@@ -0,0 +1,19 @@
+terraform {
+  required_providers {
+    kubernetes = {
+      source                = "hashicorp/kubernetes"
+      version               = "~> 2.24.0"
+      configuration_aliases = [kubernetes]
+    }
+    helm = {
+      source                = "hashicorp/helm"
+      version               = "~> 2.12.1"
+      configuration_aliases = [helm]
+    }
+    null = {
+      source                = "hashicorp/null"
+      version               = "~> 3.2.2"
+      configuration_aliases = [null]
+    }
+  }
+}

modules/cluster-addons/outputs.tf

@@ -0,0 +1,3 @@
+output "cluster_id" {
+  value = var.cluster_id
+}

modules/cluster-addons/variables.tf

@@ -0,0 +1,29 @@
+variable "full_path_to_kubeconfig" {
+  type        = string
+  description = "Full path to the kubeconfig file"
+}
+
+variable "cluster_addons" {
+  type = map(
+    object({
+      enabled       = bool
+      chart_version = string
+    })
+  )
+  description = <<EOT
+    cluster_addons = {
+      addon =  {
+        enabled = false
+        chart_version = "1.0.0"
+      }
+    }
+    EOT
+  nullable    = true
+  default     = null
+}
+
+variable "cluster_id" {
+  type        = string
+  description = "The cluster ID"
+  nullable    = false
+}

outputs.tf

@@ -1,21 +1,21 @@
 output "cluster_name" {
-  value = digitalocean_kubernetes_cluster.cluster.name
+  value = digitalocean_kubernetes_cluster.this.name
 }
 
 output "cluster_id" {
-  value = digitalocean_kubernetes_cluster.cluster.id
+  value = digitalocean_kubernetes_cluster.this.id
 }
 
 output "cluster_urn" {
-  value = digitalocean_kubernetes_cluster.cluster.urn
+  value = digitalocean_kubernetes_cluster.this.urn
 }
 
 output "cluster_endpoint" {
-  value = digitalocean_kubernetes_cluster.cluster.endpoint
+  value = digitalocean_kubernetes_cluster.this.endpoint
 }
 
 output "cluster_kube_config" {
-  value = digitalocean_kubernetes_cluster.cluster.kube_config
+  value = digitalocean_kubernetes_cluster.this.kube_config
 }
 
 output "full_path_to_kubeconfig" {
@@ -25,3 +25,7 @@ output "full_path_to_kubeconfig" {
 output "environment_variable_kubeconfig" {
   value = "export KUBECONFIG=${local.full_path_to_kubeconfig}"
 }
+
+output "cluster_addons" {
+  value = var.cluster_addons
+}

provider.tf

@@ -10,5 +10,33 @@ terraform {
       source  = "hashicorp/local"
       version = "~> 2.4.0"
     }
+    kubernetes = {
+      source  = "hashicorp/kubernetes"
+      version = "~> 2.24.0"
+    }
+    helm = {
+      source  = "hashicorp/helm"
+      version = "~> 2.12.1"
+    }
+    null = {
+      source  = "hashicorp/null"
+      version = "~> 3.2.2"
+    }
+  }
+}
+
+provider "kubernetes" {
+  alias       = "default"
+  config_path = local_sensitive_file.kubeconfig[0].filename
+}
+
+provider "helm" {
+  alias = "default"
+  kubernetes {
+    config_path = local_sensitive_file.kubeconfig[0].filename
   }
 }
+
+provider "null" {
+  alias = "default"
+}

variables.tf

@@ -54,3 +54,22 @@ variable "use_cluster_name_in_config" {
   nullable    = true
   default     = false
 }
+
+variable "cluster_addons" {
+  type = map(
+    object({
+      enabled       = bool
+      chart_version = string
+    })
+  )
+  description = <<EOT
+    cluster_addons = {
+      addon =  {
+        enabled = "true"
+        chart_version = "1.0.0"
+      }
+    }
+    EOT
+  nullable    = true
+  default     = null
+}