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Remove Infra with the Terraform Destroy step

This topic describes how to add a Terraform Destroy step to remove any provisioned infrastructure, just like running the terraform destroy command. See destroy from Terraform.

The Terraform Destroy step is independent of any other Terraform provisioning steps. It's not restricted to removing the infrastructure deployed in its stage. It can remove any infrastructure you've provisioned using Harness.

Before You Begin

Important: Install Terraform on Delegates

Terraform must be installed on the Delegate to use a Harness Terraform Provisioner. You can install Terraform manually or use the INIT_SCRIPT environment variable in the Delegate YAML.

See Install Software on the Delegate with Initialization Scripts.

# Install TF  
curl -O -L https://releases.hashicorp.com/terraform/0.12.25/terraform_0.12.25_linux_amd64.zip
unzip terraform_0.12.25_linux_amd64.zip
mv ./terraform /usr/bin/
# Check TF install
terraform --version

Review: What Gets Destroyed?

When you add Terraform Plan and Apply steps, you specify the Terraform script that Harness will use for provisioning. You add a Provisioner Identifier to each step to identify the provisioning.

When you destroy the provisioned infrastructure, you specify the same Provisioner Identifier in the Terraform Destroy step. The Provisioner Identifier enables Harness to locate the same Terraform script used for provisioning.

Step 1: Add the Terraform Destroy Step

You can add the Terraform Destroy step in the following places:

  • The Execution steps of a stage.
  • The steps of an Infrastructure's Dynamic Provisioning section.
  • The Rollback steps of a stage's Execution or Infrastructure using Dynamic Provisioning.

In Name, enter a name for the step. You can use the name to reference the Terraform Destroy settings.

Step 2: Configuration Type

There are three options:

  • Inline: Removes the provisioned resources you identify using Provisioner Identifier and other settings.
  • Inherit from Plan: Removes the resources defined in the Harness Terraform Plan step that you identify using Provisioner Identifier. Similar to terraform plan -destroy.
  • Inherit from Apply: Removes the resources defined in the Harness Terraform Apply step that you identify using Provisioner Identifier. Similar to terraform destroy.

Step 3: Reference the Provisioner Identifier

In Provisioner Identifier, enter the same Provisioner Identifier you used in the Terraform Apply step that provisioning the resources you want to destroy.

Click Apply Changes.

The Terraform Destroy step is added.

See Also