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In this lesson we explain how Terraform initializes a backend, where backend initialization fits into the overall Terraform workflow, and the operational implications of backend initialization success or failure. Key points:
  • Backend configuration is read and processed during terraform init. (Terraform may automatically run init when needed before other commands — for example when the .terraform directory is missing.)
  • Terraform does not evaluate backend configuration during terraform plan or terraform apply; those commands assume an already-initialized backend.
  • If the backend cannot be initialized during terraform init, Terraform stops immediately.
  • Terraform must successfully initialize the backend before it can read state, calculate a plan, or apply changes.
  • Backend initialization is a hard prerequisite for all Terraform operations.
  • Backend initialization happens once per working directory, not on every run. After a successful terraform init, Terraform remembers the backend configuration.
  • The backend is re-initialized only if:
    • the backend configuration changes,
    • the .terraform directory is removed, or
    • you run terraform init -reconfigure.
  • In all other cases you do not need to run terraform init again.
Backend configuration is processed during initialization. Subsequent operations (plan, apply, refresh, import) all depend on the initialized backend and the state it provides. Terraform may automatically run terraform init when necessary (for example if the .terraform directory is missing).
Example — a typical terraform init interaction (trimmed output):
After a successful init you can run terraform plan or terraform apply:
Operational implications
  • Terraform cannot proceed if backend initialization fails. No state access means no plan and no apply.
  • Backend initialization failures are blocking errors — they prevent any further Terraform operations.
  • Every plan, apply, refresh, or import depends on a successfully initialized backend.
If you accidentally remove the .terraform directory or change backend settings without reinitializing, Terraform will require re-running terraform init (or terraform init -reconfigure) before it can access state and continue.
When the backend is re-initialized Execution order (always the same)
  1. terraform init — initialize the working directory and backend.
  2. Backend is initialized and state is accessed.
  3. terraform plan — Terraform calculates the proposed changes.
  4. terraform apply — Terraform applies the changes.
Final takeaway Backend initialization is the first and most critical step in any Terraform workflow. Without a successfully initialized backend, Terraform cannot read state, produce a plan, or apply infrastructure. Keep backend configuration correct, track changes that affect initialization, and re-run terraform init (or terraform init -reconfigure) whenever backend settings or local metadata change. Links and references

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