Demeter Up

Docs & tools to setup your Demeter cluster.

Introduction

Anyone can run their own Demeter cluster. A Demeter cluster is in essence just a Kubernetes cluster with the following customizations:

• Follows a specific set of conventions on how to label and taint the workers nodes
• It provides a set of shared services for common tasks (eg: observability, certificates, secrets, etc)
• It runs a custom component called dmtrd that contains the core business logic
• It provides a set of extensions which are K8s operator for end-user resources

This repository provides instructions and resources to help you setup your own cluster.

Stages

The setup process is divided into stages that need to be executed in sequence. Each stage has its own README with more fined-grained instructions. Bootstrap and Stage 0 are optional if you bring your own cluster.

Stage	Description	Docs
Bootstrap	Cloud provider setup	docs
Stage 0	Kubernetes cluster setup	docs
Stage 1	Shared services static setup	docs
Stage 2	Shared services workload setup	docs
Stage 3	Extensions setup	docs

Quick Start

The fastest way to configure your cluster is using the bin/bootstrap-cloud script. Out of the box, this will configure a local k3d cluster. To configure a default cluster in AWS in the us-west-2 region, you only need to provide two configuration items or GCP in us-central1.

config.yaml:

cloud_provider: aws

The bin/bootstrap-cloud command will:

• Create the necessary AWS infrastructure for holding remote Terraform state data securely
• Configure the backend.tf files in stage0 through stage3 to match above
• Configure the env.auto.tfvars files in stage1 through stage3 to match above
• Create an EKS cluster in its own VPC in AWS

The user will need to complete the remaining steps for each of the stage1 through stage3 as documented in each stage's README file.

Sharing a cluster

The bootstrap process, while idempotent if configured correctly, can be destructive. Because of this, there's an alternative script for team members to use after the initial cluster creation is complete.

First, configure the config.yaml file as you would for bootstrap, but you must also include the correct information for the Terraform bucket created by bootstrap.

config.yaml:

cloud_provider: aws
terraform_state_bucket: abcd1234deadbeef-terraform-state
terraform_state_region: us-west-2

Any other custom configuration should also be shared to ensure consistency.

After this, the new team member should run the bin/setup command, which will configure the backend.tf and env.auto.tfvars files in each of the stages.