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Provisioning Databricks workspaces on GCP.

Provisioning Databricks workspaces on GCP

You can provision multiple Databricks workspaces with Terraform.

Creating a GCP service account for Databricks Provisioning

This guide assumes that you are already familiar with Hashicorp Terraform and have provisioned some of the Google Compute Cloud infrastructure. To work with Databricks in GCP in an automated way, please create a service account and manually add it to the Accounts Console as an account admin. You can use the following Terraform configuration to create a Service Account for Databricks Provisioning, which can be impersonated by a list of principals defined in delegate_from variable. Service Account would be automatically assigned to the newly created Databricks Workspace Creator custom role:

variable "prefix" {}

variable "project" {
  type    = string
  default = "<my-project-id>"
}

provider "google" {
  project = var.project
}

variable "delegate_from" {
  description = "Allow either user:user.name@example.com, group:deployers@example.com or serviceAccount:sa1@project.iam.gserviceaccount.com to impersonate created service account"
  type        = list(string)
}

resource "google_service_account" "sa2" {
  account_id   = "${var.prefix}-sa2"
  display_name = "Service Account for Databricks Provisioning"
}

output "service_account" {
  value       = google_service_account.sa2.email
  description = "Add this email as a user in the Databricks account console"
}

data "google_iam_policy" "this" {
  binding {
    role    = "roles/iam.serviceAccountTokenCreator"
    members = var.delegate_from
  }
}

resource "google_service_account_iam_policy" "impersonatable" {
  service_account_id = google_service_account.sa2.name
  policy_data        = data.google_iam_policy.this.policy_data
}

resource "google_project_iam_custom_role" "workspace_creator" {
  role_id = "${var.prefix}_workspace_creator"
  title   = "Databricks Workspace Creator"
  permissions = [
    "iam.serviceAccounts.getIamPolicy",
    "iam.serviceAccounts.setIamPolicy",
    "iam.roles.create",
    "iam.roles.delete",
    "iam.roles.get",
    "iam.roles.update",
    "resourcemanager.projects.get",
    "resourcemanager.projects.getIamPolicy",
    "resourcemanager.projects.setIamPolicy",
    "serviceusage.services.get",
    "serviceusage.services.list",
    "serviceusage.services.enable",
    "compute.networks.get",
    "compute.projects.get",
    "compute.subnetworks.get",
  ]
}

data "google_client_config" "current" {}

output "custom_role_url" {
  value = "https://console.cloud.google.com/iam-admin/roles/details/projects%3C${data.google_client_config.current.project}%3Croles%3C${google_project_iam_custom_role.workspace_creator.role_id}"
}

resource "google_project_iam_member" "sa2_can_create_workspaces" {
  project = var.project
  role    = google_project_iam_custom_role.workspace_creator.id
  member  = "serviceAccount:${google_service_account.sa2.email}"
}

After you’ve added the Service Account to Databricks Accounts Console, please copy its name into databricks_google_service_account variable. If you prefer environment variables - DATABRICKS_GOOGLE_SERVICE_ACCOUNT is the one you’ll use instead. Please also copy the Account ID into databricks_account_id variable.

Authenticate with Databricks account API

Databricks account-level APIs can only be called by account owners and account admins and can only be authenticated using Google-issued OIDC tokens. The simplest way to do this would be via Google Cloud CLI. The gcloud command is available after installing the SDK. Then run the following commands:

  • gcloud auth application-default login to authorize your user with Google Cloud Platform. (If you want to use your service account's credentials instead, set the environment variable GOOGLE_APPLICATION_CREDENTIALS to the path of the JSON file that contains your service account key)
  • terraform init to load Google and Databricks Terraform providers.
  • terraform apply to apply the configuration changes. Terraform will use your credential to impersonate the service account specified in databricks_google_service_account to call the Databricks account-level API.

Alternatively, if you cannot use impersonation and Application Default Credentials as configured by gcloud, consider using the service account key directly by passing it to google_credentials parameter (or GOOGLE_CREDENTIALS environment variable) to avoid using gcloud, impersonation, and ADC altogether. The content of this parameter must be either the path to .json file or the full JSON content of the Google service account key.

Provider initialization

variable "databricks_account_id" {}
variable "databricks_google_service_account" {}
variable "google_project" {}
variable "google_region" {}
variable "google_zone" {}


terraform {
  required_providers {
    databricks = {
      source = "databricks/databricks"
    }
    google = {
      source  = "hashicorp/google"
      version = "4.47.0"
    }
  }
}

provider "google" {
  project = var.google_project
  region  = var.google_region
  zone    = var.google_zone
}

// initialize provider in "accounts" mode to provision new workspace

provider "databricks" {
  alias                  = "accounts"
  host                   = "https://accounts.gcp.databricks.com"
  google_service_account = var.databricks_google_service_account
  account_id             = var.databricks_account_id
}

data "google_client_openid_userinfo" "me" {
}

data "google_client_config" "current" {
}

resource "random_string" "suffix" {
  special = false
  upper   = false
  length  = 6
}

Creating a VPC

The very first step is VPC creation with the necessary resources. Please consult main documentation page for the most complete and up-to-date details on networking. A GCP VPC is registered as databricks_mws_networks resource.

resource "google_compute_network" "dbx_private_vpc" {
  project                 = var.google_project
  name                    = "tf-network-${random_string.suffix.result}"
  auto_create_subnetworks = false
}

resource "google_compute_subnetwork" "network-with-private-secondary-ip-ranges" {
  name          = "test-dbx-${random_string.suffix.result}"
  ip_cidr_range = "10.0.0.0/16"
  region        = "us-central1"
  network       = google_compute_network.dbx_private_vpc.id
  secondary_ip_range {
    range_name    = "pods"
    ip_cidr_range = "10.1.0.0/16"
  }
  secondary_ip_range {
    range_name    = "svc"
    ip_cidr_range = "10.2.0.0/20"
  }
  private_ip_google_access = true
}

resource "google_compute_router" "router" {
  name    = "my-router-${random_string.suffix.result}"
  region  = google_compute_subnetwork.network-with-private-secondary-ip-ranges.region
  network = google_compute_network.dbx_private_vpc.id
}

resource "google_compute_router_nat" "nat" {
  name                               = "my-router-nat-${random_string.suffix.result}"
  router                             = google_compute_router.router.name
  region                             = google_compute_router.router.region
  nat_ip_allocate_option             = "AUTO_ONLY"
  source_subnetwork_ip_ranges_to_nat = "ALL_SUBNETWORKS_ALL_IP_RANGES"
}

resource "databricks_mws_networks" "this" {
  provider     = databricks.accounts
  account_id   = var.databricks_account_id
  network_name = "test-demo-${random_string.suffix.result}"
  gcp_network_info {
    network_project_id    = var.google_project
    vpc_id                = google_compute_network.dbx_private_vpc.name
    subnet_id             = google_compute_subnetwork.network-with-private-secondary-ip-ranges.name
    subnet_region         = google_compute_subnetwork.network-with-private-secondary-ip-ranges.region
    pod_ip_range_name     = "pods"
    service_ip_range_name = "svc"
  }
}

Creating a Databricks Workspace

Once the VPC is set up, you can create Databricks workspace through databricks_mws_workspaces resource.

Code that creates workspaces and code that manages workspaces must be in separate terraform modules to avoid common confusion between provider = databricks.accounts and provider = databricks.created_workspace. This is why we specify databricks_host and databricks_token outputs, which have to be used in the latter modules.

-> Note If you experience technical difficulties with rolling out resources in this example, please make sure that environment variables don't conflict with other provider block attributes. When in doubt, please run TF_LOG=DEBUG terraform apply to enable debug mode through the TF_LOG environment variable. Look specifically for Explicit and implicit attributes lines, indicating authentication attributes used. The other common reason for technical difficulties might be related to missing alias attribute in provider "databricks" {} blocks or provider attribute in resource "databricks_..." {} blocks. Please make sure to read alias: Multiple Provider Configurations documentation article.

resource "databricks_mws_workspaces" "this" {
  provider       = databricks.accounts
  account_id     = var.databricks_account_id
  workspace_name = "tf-demo-test-${random_string.suffix.result}"
  location       = google_compute_subnetwork.network-with-private-secondary-ip-ranges.region
  cloud_resource_container {
    gcp {
      project_id = var.google_project
    }
  }

  network_id = databricks_mws_networks.this.network_id
  gke_config {
    connectivity_type = "PRIVATE_NODE_PUBLIC_MASTER"
    master_ip_range   = "10.3.0.0/28"
  }

  token {
    comment = "Terraform"
  }

  # this makes sure that the NAT is created for outbound traffic before creating the workspace
  depends_on = [google_compute_router_nat.nat]
}

output "databricks_host" {
  value = databricks_mws_workspaces.this.workspace_url
}

output "databricks_token" {
  value     = databricks_mws_workspaces.this.token[0].token_value
  sensitive = true
}

Data resources and Authentication is not configured errors

In Terraform 0.13 and later, data resources have the same dependency resolution behavior as defined for managed resources. Most data resources make an API call to a workspace. If a workspace doesn't exist yet, default auth: cannot configure default credentials error is raised. To work around this issue and guarantee proper lazy authentication with data resources, you should add depends_on = [databricks_mws_workspaces.this] to the body. This issue doesn't occur if a workspace is created in one module and resources within the workspace are created in another. We do not recommend using Terraform 0.12 and earlier if your usage involves data resources.

data "databricks_current_user" "me" {
  depends_on = [databricks_mws_workspaces.this]
}

Provider configuration

In the next step, please use the following configuration for the provider:

provider "databricks" {
  host  = module.dbx_gcp.workspace_url
  token = module.dbx_gcp.token_value
}

We assume that you have a terraform module in your project that creates a workspace (using Databricks Workspace section), and you named it as dbx_gcp while calling it in the main.tf file of your terraform project. And workspace_url and token_value are the output attributes of that module. This provider configuration will allow you to use the generated token to authenticate to the created workspace during workspace creation.

More than one authorization method configured error

See the troubleshooting guide