Resource lifecycle block

Q: How deeply does Terraform in Depth: Infrastructure as Code with Terraform and OpenTofu cover resource lifecycle block?

Explains block scope, replacement ordering, destruction protection, ignored changes, and replacement triggers with configuration examples.

As explained in Terraform in Depth: Infrastructure as Code with Terraform and OpenTofu

A nested Terraform configuration block that contains rules governing how a resource is created, updated, replaced, and destroyed.

When replacing infrastructure, Terraform normally destroys the existing object before creating its replacement. A resource lifecycle block lets configuration change that behavior and govern other management rules. section 2.7.2

Use the block once inside a resource or data source to configure:

create_before_destroy, which creates the replacement first when temporary resource loss is unacceptable, though unique names or shared resources can make this fail. section 2.7.2
prevent_destroy, which makes plans that destroy the resource fail; use it rarely because lifecycle values must be hardcoded literals. section 2.7.2

How Terraform in Depth: Infrastructure as Code with Terraform and OpenTofu covers it

Cover of Terraform in Depth: Infrastructure as Code with Terraform and OpenTofu

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Related concepts

ignore_changesconfigures · ignore_changes is a Terraform lifecycle setting that excludes specified resource attributes from change detection after resource creation.
create_before_destroyhas part · create_before_destroy is a Terraform lifecycle setting that causes a replacement object to be created before the existing object is destroyed.
replace_triggered_byhas part · replace_triggered_by is a Terraform lifecycle setting that causes a resource to be replaced when specified resource attributes or referenced resources change.
prevent_destroyhas part · prevent_destroy is a Terraform lifecycle setting that causes plans destroying the associated resource to fail when enabled.
terraform resourceconfigures · A Terraform resource is a declarative configuration construct that describes an infrastructure object and its settings for Terraform to manage.

This explainer was generated by Manning's knowledge graph from the text of Terraform in Depth: Infrastructure as Code with Terraform and OpenTofu. The section links point to the parts of the book it draws on.