Which command should you use to ensure a null resource in Terraform re-runs a backup process after script changes?

The reason for using the command that specifies -replace="nullresource.backupdatabase" is that it instructs Terraform to destroy the existing instance of the null resource and create a new one in its place. This is particularly useful when you want to re-run a script or a process associated with that resource without making changes to the overall infrastructure. By using the -replace flag, Terraform recognizes that the existing resource should be replaced due to the script changes, thus triggering the desired backup process to run again.

Using this command effectively circumvents the typical dependency checks and only focuses on the targeted resource for replacement, ensuring that the new execution of the script reflects whatever updates have been made. This is a key aspect of managing resources that do not have traditional state dependencies but are rather driven by script logic or external commands.

The other commands do not achieve the same goal as replacing the resource. For example, using terraform apply -target=nullresource.backupdatabase would apply changes only to that resource but does not specifically indicate that it should be recreated. Similarly, validating the resource with terraform validate does not apply changes or influence the execution of scripts. Finally, terraform plan -target=nullresource.backupdatabase would generate a plan for