Google Cloud Storage - Terraform

Terraform script to create GCS buckets in Montreal region based on namespace and application variables passed in. It creates 4 buckets, dev, test, prod, tools for each application.

Steps

1. Download Terraform based on your operating system and architecture.

   • https://www.terraform.io/downloads.html
   • or install via asdf (the versions are defined in .tool-versions).

2. Select an existing project or create a new one to have the project ID.

3. Create a service account private key and download it as JSON format.

   • Go to IAM & Admin
   • GO to Service accounts
   • Create a Service account or select an exisiting one
   • Create a private key to download (credentials.json)

4. Set basic Terraform environment variables

   • https://www.terraform.io/docs/commands/environment-variables.html#tf_var_name

export TF_VAR_credentials=service_account_key_filepath # required, eg) credentials.json
export TF_VAR_project_name=project-name # required
export TF_VAR_backend_bucket=backend-bucket-name # required
export TF_VAR_envs='["dev", "test", "prod", "tools"]' # optional, default to ["dev", "test", "prod", "tools"]

• Once application environment list is overridden via TF_VAR_envs, it will affect all other namespace sets.

1. Create an initial GCS bucket to store Terraform state files.

cd remote-state
terraform init
terraform apply -auto-approve
cd ..

1. Initialize a working directory and build or change infrastructure based on the configuration file main.tf.

   • Note that init command includes the backend configuration using required environment variables.

terraform init -backend-config="bucket=$TF_VAR_backend_bucket" -backend-config="credentials=$TF_VAR_credentials"
terraform apply -var="namespace=button" -var="application=cas" -auto-approve