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terraform-gke-kubeflow-cluster

A Terraform module for creating a GKE cluster to run Kubeflow on.

This module creates a GKE cluster similiar to how the kfctl tool does, with a few changes:

• adds a Cloud SQL instance to use for the metadata store/databases
• creates a GCE Persistent Disk to use for the artifact store

This module was originally created by the ML Infrastructure team at Spotify to create and manage long-lived GKE clusters for many Kubeflow-using teams at Spotify to use, whereas the kfctl tool and documentation around creating a cluster for Kubeflow tends to assume that individual clusters are quickly spun-up and torn-down by engineers using Kubeflow. For more details on how Spotify's centralized Kubeflow platform, see this talk from Kubecon North America 2019.

Usage

To use this within Terraform, add a module block like:

module "kubeflow-cluster" {
  source  = "spotify/kubeflow-cluster/gke"
  version = "0.0.1"
}

For more details, see https://registry.terraform.io/modules/spotify/kubeflow-cluster/gke/0.0.1

Module details

The terraform-gke-kubeflow-cluster module creates the following resources:

• a GKE cluster (attached to a Shared VPC if the relevant parameters for networks/subnetworks are set)
• a Cloud SQL instance to use for the metadata store/databases
• a GCE Persistent Disk to use for Argo's artifact store
• GCP service accounts for Kubeflow to use (distinct accounts per cluster):
  • an "admin" service account (used for IAP - which is not included in this module)
  • the "user" service account for Kubeflow pipelines to use
  • the VM service account used by the GKE cluster/nodes itself
• IAM bindings for the above service accounts
• Kubernetes secrets for:
  • cloudsql-instance-credentials for the cloudsql-proxy connected to the metadata SQL instance
  • admin-gcp-sa containing the "admin" GCP service account for Kubeflow
  • user-gcp-sa containing the "user" GCP service account for Kubeflow

Each "instantiation" of the module creates a new set of all of these resources

• the intent of the module is to automate the entire setup of all of the GCP resources needed to run a Kubeflow cluster.

This repo does not currently actually install the Kubeflow system components on the cluster - use kfctl or another tool for that.

Local development

Run the following commands from the root of the project:

1. brew install tfenv -- install tfenv
2. tfenv install -- install the version of Terraform specified in .terraform-version in source control
3. terraform init -- setup terraform providers

Note on master and node version values

The expected behavior of fuzzy versions for min_master_version and node_version is undocumented (Github issue). From empirical evidence, the behavior so far is that the most recent version that matches the fuzzy version is used. For example, node_version = "1.11" results in GKE nodes running 1.11.7-gke.6 if that's the most recent version.

Releasing new versions of the module

See https://www.terraform.io/docs/registry/modules/publish.html#releasing-new-versions

A webhook has been automatically added to the repo, and a new "release" will be visible in the Terraform Registry whenever a new tag is pushed that looks like a semantic version (e.g. "v1.2.3"). So to cut a release, simply tag a commit and make sure to push the tag to Github with git push --tags.

Code of Conduct

This project adheres to the Open Code of Conduct. By participating, you are expected to honor this code.