From 90885e49cfdf2f56bb2d50a1c93563af376d078e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=A9r=C3=B4me=20Petazzoni?= <jerome.petazzoni@gmail.com>
Date: Tue, 4 Jan 2022 18:51:35 +0100
Subject: [PATCH] =?UTF-8?q?=E2=9E=95=20Add=20Terraform=20configurations=20?=
 =?UTF-8?q?for=20GKE?=
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---
 prepare-tf/main.tf                            |  2 +-
 prepare-tf/modules/googlecloud/main.tf        | 25 +++++++++
 prepare-tf/modules/googlecloud/outputs.tf     | 31 +++++++++++
 prepare-tf/modules/googlecloud/providers.tf   |  8 +++
 prepare-tf/modules/googlecloud/variables.tf   | 51 +++++++++++++++++++
 .../oraclecloud/{provider.tf => providers.tf} |  0
 6 files changed, 116 insertions(+), 1 deletion(-)
 create mode 100644 prepare-tf/modules/googlecloud/main.tf
 create mode 100644 prepare-tf/modules/googlecloud/outputs.tf
 create mode 100644 prepare-tf/modules/googlecloud/providers.tf
 create mode 100644 prepare-tf/modules/googlecloud/variables.tf
 rename prepare-tf/modules/oraclecloud/{provider.tf => providers.tf} (100%)

diff --git a/prepare-tf/main.tf b/prepare-tf/main.tf
index b8b326b0..91d8337b 100644
--- a/prepare-tf/main.tf
+++ b/prepare-tf/main.tf
@@ -1,5 +1,5 @@
 module "clusters" {
-  source             = "./modules/linode"
+  source             = "./modules/oraclecloud"
   for_each           = local.clusters
   cluster_name       = each.value.cluster_name
   min_nodes_per_pool = var.min_nodes_per_pool
diff --git a/prepare-tf/modules/googlecloud/main.tf b/prepare-tf/modules/googlecloud/main.tf
new file mode 100644
index 00000000..8c25804e
--- /dev/null
+++ b/prepare-tf/modules/googlecloud/main.tf
@@ -0,0 +1,25 @@
+resource "google_container_cluster" "_" {
+  name               = var.cluster_name
+  project            = "prepare-tf"
+  location           = "europe-north1-a"
+  min_master_version = var.k8s_version
+  initial_node_count = var.min_nodes_per_pool
+  #max_size    = max(var.min_nodes_per_pool, var.max_nodes_per_pool)
+  #autoscaling = true
+  #autohealing = true
+
+  node_config {
+    tags         = var.common_tags
+    machine_type = local.node_type
+  }
+
+  # This is not strictly necessary.
+  # We'll see if we end up using it.
+  # (If it is removed, make sure to also remove the corresponding
+  # key+cert variables from outputs.tf!)
+  master_auth {
+    client_certificate_config {
+      issue_client_certificate = true
+    }
+  }
+}
diff --git a/prepare-tf/modules/googlecloud/outputs.tf b/prepare-tf/modules/googlecloud/outputs.tf
new file mode 100644
index 00000000..b5099bdb
--- /dev/null
+++ b/prepare-tf/modules/googlecloud/outputs.tf
@@ -0,0 +1,31 @@
+data "google_client_config" "_" {}
+
+output "kubeconfig" {
+  value = <<-EOT
+    apiVersion: v1
+    kind: Config
+    current-context: ${google_container_cluster._.name}
+    clusters:
+    - name: ${google_container_cluster._.name}
+      cluster:
+        server: https://${google_container_cluster._.endpoint}
+        certificate-authority-data: ${google_container_cluster._.master_auth[0].cluster_ca_certificate}
+    contexts:
+    - name: ${google_container_cluster._.name}
+      context:
+        cluster: ${google_container_cluster._.name}
+        user: client-token
+    users:
+    - name: client-cert
+      user:
+        client-key-data: ${google_container_cluster._.master_auth[0].client_key}
+        client-certificate-data: ${google_container_cluster._.master_auth[0].client_certificate}
+    - name: client-token
+      user:
+        token: ${data.google_client_config._.access_token}
+    EOT
+}
+
+output "cluster_id" {
+  value = google_container_cluster._.id
+}
diff --git a/prepare-tf/modules/googlecloud/providers.tf b/prepare-tf/modules/googlecloud/providers.tf
new file mode 100644
index 00000000..53fca6a2
--- /dev/null
+++ b/prepare-tf/modules/googlecloud/providers.tf
@@ -0,0 +1,8 @@
+terraform {
+  required_providers {
+    google = {
+      source  = "hashicorp/google"
+      version = "4.5.0"
+    }
+  }
+}
diff --git a/prepare-tf/modules/googlecloud/variables.tf b/prepare-tf/modules/googlecloud/variables.tf
new file mode 100644
index 00000000..02e20386
--- /dev/null
+++ b/prepare-tf/modules/googlecloud/variables.tf
@@ -0,0 +1,51 @@
+variable "cluster_name" {
+  type    = string
+  default = "deployed-with-terraform"
+}
+
+variable "common_tags" {
+  type    = list(string)
+  default = []
+}
+
+variable "node_size" {
+  type    = string
+  default = "M"
+}
+
+variable "min_nodes_per_pool" {
+  type    = number
+  default = 2
+}
+
+variable "max_nodes_per_pool" {
+  type    = number
+  default = 5
+}
+
+# FIXME
+variable "enable_arm_pool" {
+  type    = bool
+  default = false
+}
+
+variable "node_types" {
+  type = map(string)
+  default = {
+    "S" = "e2-small"
+    "M" = "e2-medium"
+    "L" = "e2-standard-2"
+  }
+}
+
+locals {
+  node_type = var.node_types[var.node_size]
+}
+
+# See supported versions with:
+# gcloud container get-server-config --region=europe-north1 '--format=flattened(channels)'
+# But it's also possible to just specify e.g. "1.20" and it figures it out.
+variable "k8s_version" {
+  type    = string
+  default = "1.21"
+}
diff --git a/prepare-tf/modules/oraclecloud/provider.tf b/prepare-tf/modules/oraclecloud/providers.tf
similarity index 100%
rename from prepare-tf/modules/oraclecloud/provider.tf
rename to prepare-tf/modules/oraclecloud/providers.tf