Here is quick HOWTO use terragrunt with multiple environments.

Requirements:

• git
• terraform
• terragrunt
• gcloud
• kubectl (version from gcloud is ok)
• helm
• Please follow "Before you begin" part of GCP manual

Terragrunt allows to store terraform manifests separately from terraform [sensitive] values and support multiple environments.

In this example we have 3 envs - dev,staging, and prod. Adjust all the terragrunt.hcl files to suit your environments. Let's deploy staging env. Start from infra deployment.

• Init

cd examples/live/staging/infra
terragrunt init

• Check terraform plan

terragrunt plan

• Apply changes, it takes some time, 10-30min

terragrunt apply -auto-approve

Similar for basic preparations inside k8s

cd examples/live/staging/in-k8s
terragrunt init
terragrunt plan
terragrunt apply -auto-approve

• Destroy all the staff, when required

cd examples/live/staging/infra
terragrunt destroy