Manage Resource Lifecycles and Import Existing Infrastructure

Table of Contents

1. Challenge

   Define explicit resource dependencies

   1. Identify an ordering requirement that Terraform cannot infer from existing resource references.
   2. Define the required dependency using
2. Challenge

   Apply resource lifecycle rules

   1. Configure create_before_destroy and prevent_destroy on the designated resources.
   2. Configure ignore_changes for a specific externally managed attribute.
3. Challenge

   Predict lifecycle behaviour from plan output

   1. Review plans for controlled changes and predict how the configured lifecycle rules affect replacement, destruction, and attribute updates.
   2. Verify the predictions through permitted operations and the expected destruction-protection error.
4. Challenge

   Import an existing resource

   1. Define a resource block and an import block for the designated resource created outside Terraform.
   2. Review and complete the import while preserving the existing AWS resource.
5. Challenge

   Reconcile the imported resource configuration

   1. Compare the imported resource’s settings with its Terraform configuration.
   2. Align the configuration with the intended settings and verify that the resulting plan contains no unintended changes.
6. Challenge

   Rename a resource safely

   1. Rename the Terraform resource address and record the address change using a moved block.
   2. Apply the move and verify that the AWS resource retains its identity without replacement.