OpenTofu uses state to track managed resources, providers to connect configuration to services, modules to organize reusable configuration, and plans to preview proposed changes. Start a working directory with tofu init; before migrating from Terraform, note that OpenTofu’s documented support statement covers existing state files created through Terraform 1.5.x, not every later state version or every provider and module combination.
What is a state file?
State is OpenTofu’s persisted record of the resources it manages. It lets OpenTofu relate the resources described in configuration to real infrastructure. A backend determines where that state is stored.
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| Backend choice | Where state is stored | Practical considerations |
|---|---|---|
| Local | On disk in the working environment; this is the default backend. | Straightforward for an individual workflow, but the state file needs careful protection and a separate sharing or backup approach for collaboration. |
| Remote | In a remote backend. | Can support shared access and may provide state locking. Locking is not guaranteed: OpenTofu documentation says, “State locking is optional.” Check the selected backend’s behavior. |
Remote storage reduces ordinary local persistence, but it does not guarantee that state never reaches a local disk. If OpenTofu cannot persist state to the remote backend, it writes a local recovery copy. After fixing the underlying problem, an operator must manually push the saved state back. tofu state push overwrites remote state, so using it without confirming the correct state and recovery procedure can cause serious damage. See the OpenTofu state storage and locking documentation.
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Choose a backend that fits how the team needs to access and protect state, and confirm whether it supports locking. Remote state contains sensitive data; OpenTofu’s backend documentation cautions that “Accessing remote state generally requires access credentials, since state data contains extremely sensitive information.”
#1 Best Overall
- Protect state and backend configuration as sensitive data.
- Avoid hard-coding credentials or passing sensitive values with
-backend-config. OpenTofu can record those values in plain text in working-directory metadata and saved plans. Supply credentials and other sensitive values through environment variables instead. - Remember that a saved plan uses the backend configuration captured when the plan was created. Credentials included in that configuration can expire before the plan is applied.
- Keep a recovery copy secure. If a remote write fails, resolve the failure and carefully verify the local recovery file before pushing it; a push replaces remote state.
See OpenTofu’s backend configuration documentation for configuration details.
What is the difference between a provider and a module?
| Concept | What it is | What it contributes |
|---|---|---|
| Provider | A separately distributed plugin with its own releases and version cadence. | Implements resource types and data sources that let OpenTofu interact with cloud platforms, SaaS products, and APIs. |
| Module | A directory of configuration files packaged as a reusable unit. | Groups resources and configuration. A module can call other modules to structure and reuse infrastructure definitions. |
Provider selection is about the functionality and resource types a configuration needs, plus compatibility with the configuration’s version constraints. Declare acceptable provider versions and commit the dependency lock file so initialization can reproduce the selected provider versions. Consult documentation for the provider version in use. The provider documentation explains provider requirements and installation.
Where can I find providers and modules?
Providers and modules are distributed separately. OpenTofu’s registries make packages discoverable; the Public OpenTofu Registry offers downloadable modules, while organizations may use private module registries through TACOS offerings.
In a module, provider configurations belong in the root module. Child modules can inherit those configurations or receive them explicitly, but each module still declares its provider requirements. State retains a reference to the provider configuration used for managed resources. Do not remove that configuration until those resources have been destroyed: otherwise, OpenTofu may be unable to plan operations for them. See the modules documentation and provider configuration documentation for modules.
Rank #3
What does tofu init do?
tofu init prepares a working directory for normal OpenTofu operations. It accesses the configured backend and state, installs providers, and downloads modules. OpenTofu’s documentation states, “A working directory must be initialized before OpenTofu can perform any operations in it (like provisioning infrastructure or modifying state).”
- Open a terminal in the directory containing the root configuration.
- Run
tofu init. - Review the initialization output for backend, provider, or module errors before running other operations.
Run initialization again after changing provider requirements, module sources or version constraints, or backend configuration. The init command documentation covers its behavior.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What does a plan show?
tofu plan previews the infrastructure changes OpenTofu proposes based on the configuration and the state and provider information available when it runs. Review the proposed changes before applying them. A plan is a preview, not a guarantee that remote conditions will remain unchanged between planning and applying.
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A saved plan is a sensitive artifact: it can contain backend configuration, including values that should not be exposed. Store and share plan files accordingly, and account for the fact that credentials captured in a plan may expire before apply. See the plan command documentation.
Will OpenTofu work with my existing Terraform state file?
OpenTofu’s FAQ says it supports existing Terraform state files created with Terraform versions through 1.5.x. That statement does not establish compatibility for state created by later Terraform versions, nor does it guarantee that every provider and module combination will work unchanged. For a later-version migration, consult current guidance for the relevant versions and test with a recoverable copy rather than assuming compatibility. See the OpenTofu FAQ.
Should I encrypt state and plan files?
OpenTofu v1.13 documentation describes encryption for state and plan files, with key-provider options including AWS KMS, Google Cloud KMS, Azure Key Vault, and OpenBao. The available methods and providers are version-sensitive; check the documentation matching the OpenTofu version you run before adopting an encryption configuration. See the v1.13 encryption documentation.
Quick Recap
- Back up encryption keys and test recovery before encrypting state. Without the correct key, encrypted state cannot be read.
- The v1.13 documentation recommends a separate KMS key for each state file.
- Encryption at rest does not prevent data loss or replay attacks; it is one part of state protection, not a substitute for reliable recovery procedures.
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