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Partial configuration

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

A partial configuration is a configuration that specifies only some required settings while leaving the remaining settings to be supplied separately.

A partial configuration keeps environment-specific or sensitive settings outside infrastructure code. In a Terraform backend block, hardcode only stable values such as the scheme, then supply the remaining Consul settings during initialization. section 6.4.3

Supply the omitted backend settings through one of these methods:

  • Pass individual values with repeated `-backend-config` flags; command-line values override configuration-file values, and later duplicates win. section 6.4.3
  • Avoid interactive prompting when automation or repeatable deployments require explicit initialization inputs. section 6.4.3

Initialize a partially configured Consul backend

Declare `backend "consul" { scheme = "https" }` in the Terraform configuration, then provide `address`, `path`, and `access_token` through a backend configuration file or `terraform init` flags. Keep credentials out of committed code, while remembering that supplied parameters are saved on disk. section 6.4.3

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

How deep it goes
Explains declaration, input methods, precedence, prompting, and disk persistence without detailing backend implementation internals.
Examples
Uses a partially specified Consul backend, a backend configuration file, and repeated `terraform init -backend-config` flags.
What you can do after
Operate Terraform backend initialization with external configuration while avoiding hardcoded credentials.
How it connects
Connects Terraform backend blocks with Consul, variable files, command-line flags, state management, and initialization.
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