Terraform config to set up basic GKE cluster for Temporal.

backend.tf

terraform {
  required_version = ">= 1.2.1"

  cloud {
    organization = var.tf_organization

    workspaces {
      name = var.tf_workspace
    }
  }
}

providers.tf

provider "google" {
  project     = var.gcp_project
  region      = var.gcp_region
}

terraform.tfvars

tf_organization = "acme-inc"
tf_workspace = "infrastructure"
gcp_project = "acme-app"
gcp_region = "us-central1"
subnetwork_name = "acme-subnetwork"
network_name ="acme-network"
cluster_name = "acme-workers"
subnetwork_services_name = "services-range"
subnetwork_pod_name = "pod-ranges"

variables.tf

variable "tf_organization" {
  description = "Terraform Organization"
  type        = string
}

variable "tf_workspace" {
  description = "Terraform Workspace Name"
  type        = string
}

variable "gcp_project" {
  description = "GCP Project"
  type        = string
}

variable "gcp_region" {
  description = "GCP Region"
  type        = string
}

variable "subnetwork_name" {
  description = "google_compute_subnetwork name"
  type        = string
}

variable "network_name" {
  description = "google_compute_network name"
  type        = string
}

variable "cluster_name" {
  description = "google_container_cluster name"
  type        = string
}

variable "subnetwork_services_name" {
  description = "Services ip range name"
  type        = string
}

variable "subnetwork_pod_name" {
  description = "Pod ip range name"
  type        = string
}

worker-cluster.tf

resource "google_compute_subnetwork" "kub-cluster" {
  name          = var.subnetwork_name
  ip_cidr_range = "10.0.0.0/16"
  region        = var.gcp_region
  network       = google_compute_network.kub-cluster.id

  secondary_ip_range {
    range_name    = var.subnetwork_services_name
    ip_cidr_range = "10.3.0.0/16"
  }

  secondary_ip_range {
    range_name    = var.subnetwork_pod_name
    ip_cidr_range = "10.2.0.0/16"
  }
}

resource "google_compute_network" "kub-cluster" {
  name                    = var.network_name
  auto_create_subnetworks = false
}

resource "google_container_cluster" "kub-cluster" {
  name                      = var.cluster_name
  location                  = var.gcp_region
  initial_node_count        = 1

  network    = google_compute_network.kub-cluster.id
  subnetwork = google_compute_subnetwork.kub-cluster.id

  ip_allocation_policy {
    cluster_secondary_range_name  = var.subnetwork_services_name
    services_secondary_range_name = google_compute_subnetwork.kub-cluster.secondary_ip_range.1.range_name
  }

  cluster_autoscaling {
    enabled = true

    resource_limits {
      resource_type = "cpu"
      minimum       = 6
      maximum       = 24
    }

    resource_limits {
      resource_type = "memory"
      minimum       = 12
      maximum       = 48
    }
  }
}