Terraform Gke Flux Walkthrough

This repository is just a way for practice with Terraform and TerraGrunt in order to deploy a gke cluster and test many concept of GitOps for apps/services environment with Fluxcd.

Introduction Scenario

Acme, to dispose at well their solutions to the customers want to catch bepbep, has several environments (prod, staging and dev) entirely separated.

The infrastructure in each environment consists of multiple layers (gke, flux, vpc, ...) where each layer is configured using one of Terraform modules with arguments specified in terragrunt.hcl in layer's directory.

Terragrunt is used to work with Terraform configurations which allows orchestrating of dependent layers, update arguments dynamically and keep configurations DRY.

Prerequisites

If you are using macOS you can install all dependencies using Homebrew:

$ brew install terraform terragrunt pre-commit

Project Structure

manifests contains deployment manifest files e.g. kustomize, helm, k8s manifests.
- app and service, example: podinfo service deployment manifests
stages contains Terragrunt and Terraform configurations for each environment.
- demo example environment contains module inputs
modules contains reusable Terraform modules.
- flux module for FluxCD and Helm operator
- gke module to provision Kubernetes Engine and all resources needed by the cluster

Quick start for create and managing your infrastructure

After you've create a google service account, with the min permissions for manage and create via api the cluster. You have to Navigate through layers in demo .hcl files in order to review and customize values inside inputs block or values in env file.

After that, Run this command to create infrastructure in all layers in a single region:

$ cd stages/acme-demo/
$ terragrunt apply-all

References