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Terraform Validator

This tool is used to validate terraform plans before they are applied. Validations are ran using Forseti Config Validator.

Installation

go install .

Example Usage

See the Auth section first.

# The example/ directory contains a basic Terraform config for testing the validator.
cd example/

# Set default credentials.
export GOOGLE_APPLICATION_CREDENTIALS=/path/to/your/credentials.json

# Set a project to test with
export TF_VAR_project_id=my-project-id

# Set the local forseti-config-policies repository path.
export POLICY_PATH=/path/to/your/forseti-config-policies/repo

# Generate a terraform plan.
terraform plan --out=terraform.tfplan

# Validate the google resources the plan would create.
terraform-validator validate --policy-path=${POLICY_PATH} ./terraform.tfplan

# Apply the validated plan.
terraform apply ./terraform.tfplan

Resources

The follow Terraform resources are supported for running validation checks:

  • google_compute_disk
  • google_compute_instance
  • google_compute_firewall
  • google_storage_bucket
  • google_sql_database_instance
  • google_project
  • google_organization_iam_policy
  • google_organization_iam_binding
  • google_organization_iam_member
  • google_folder_iam_policy
  • google_folder_iam_binding
  • google_folder_iam_member
  • google_project_iam_policy
  • google_project_iam_binding
  • google_project_iam_member

Testing

Unit

make test

Integration

First, build the Docker container:

make build-docker

See the Auth section for obtaining a credentials file, then start the Docker container:

export PROJECT_ID=my-project-id
export GOOGLE_APPLICATION_CREDENTIALS=$(pwd)/credentials.json
make run-docker

Finally, run the integration tests inside the container:

make test-integration

Auth

The terraform and the terraform-validator commands need to be able to authenticate to Google Cloud APIs. This can be done by generating a credentials.json file:

https://cloud.google.com/docs/authentication/production

Once you have a credentials file on your local machine, set the GOOGLE_APPLICATION_CREDENTIALS environment variable to point to the credentials file.

Disclaimer

This is not an officially supported Google product.