Backend Type: azurerm

Stores the state as a Blob with the given Key within the Blob Container within the Blob Storage Account.

This backend supports state locking and consistency checking with Azure Blob Storage native capabilities.

Example Configuration

When authenticating using the Azure CLI or a Service Principal (either with a Client Certificate or a Client Secret):

Code Block
terraform {
  backend "azurerm" {
    resource_group_name  = "StorageAccount-ResourceGroup"
    storage_account_name = "abcd1234"
    container_name       = "tfstate"
    key                  = "prod.terraform.tfstate"
  }
}

When authenticating using Managed Service Identity (MSI):

Code Block
terraform {
  backend "azurerm" {
    resource_group_name  = "StorageAccount-ResourceGroup"
    storage_account_name = "abcd1234"
    container_name       = "tfstate"
    key                  = "prod.terraform.tfstate"
    use_msi              = true
    subscription_id      = "00000000-0000-0000-0000-000000000000"
    tenant_id            = "00000000-0000-0000-0000-000000000000"
  }
}

When authenticating using OpenID Connect (OIDC):

Code Block
terraform {
  backend "azurerm" {
    resource_group_name  = "StorageAccount-ResourceGroup"
    storage_account_name = "abcd1234"
    container_name       = "tfstate"
    key                  = "prod.terraform.tfstate"
    use_oidc             = true
    subscription_id      = "00000000-0000-0000-0000-000000000000"
    tenant_id            = "00000000-0000-0000-0000-000000000000"
  }
}

When authenticating using Azure AD Authentication:

Code Block
terraform {
  backend "azurerm" {
    storage_account_name = "abcd1234"
    container_name       = "tfstate"
    key                  = "prod.terraform.tfstate"
    use_azuread_auth     = true
    subscription_id      = "00000000-0000-0000-0000-000000000000"
    tenant_id            = "00000000-0000-0000-0000-000000000000"
  }
}

Note

When using AzureAD for Authentication to Storage you also need to ensure the Storage Blob Data Owner role is assigned.

When authenticating using the Access Key associated with the Storage Account:

Code Block
terraform {
  backend "azurerm" {
    storage_account_name = "abcd1234"
    container_name       = "tfstate"
    key                  = "prod.terraform.tfstate"

    # rather than defining this inline, the Access Key can also be sourced
    # from an Environment Variable - more information is available below.
    access_key = "abcdefghijklmnopqrstuvwxyz0123456789..."
  }
}

When authenticating using a SAS Token associated with the Storage Account:

Code Block
terraform {
  backend "azurerm" {
    storage_account_name = "abcd1234"
    container_name       = "tfstate"
    key                  = "prod.terraform.tfstate"

    # rather than defining this inline, the SAS Token can also be sourced
    # from an Environment Variable - more information is available below.
    sas_token = "abcdefghijklmnopqrstuvwxyz0123456789..."
  }
}

Note

When using a Service Principal or an Access Key - we recommend using a Partial Configuration for the credentials.

Data Source Configuration

When authenticating using a Service Principal (either with a Client Certificate or a Client Secret):

Code Block
data "terraform_remote_state" "foo" {
  backend = "azurerm"
  config = {
    storage_account_name = "tofu123abc"
    container_name       = "tofu-state"
    key                  = "prod.terraform.tfstate"
  }
}

When authenticating using Managed Service Identity (MSI):

Code Block
data "terraform_remote_state" "foo" {
  backend = "azurerm"
  config = {
    resource_group_name  = "StorageAccount-ResourceGroup"
    storage_account_name = "tofu123abc"
    container_name       = "tofu-state"
    key                  = "prod.terraform.tfstate"
    use_msi              = true
    subscription_id      = "00000000-0000-0000-0000-000000000000"
    tenant_id            = "00000000-0000-0000-0000-000000000000"
  }
}

When authenticating using OpenID Connect (OIDC):

Code Block
data "terraform_remote_state" "foo" {
  backend = "azurerm"
  config = {
    resource_group_name  = "StorageAccount-ResourceGroup"
    storage_account_name = "tofu123abc"
    container_name       = "tofu-state"
    key                  = "prod.terraform.tfstate"
    use_oidc             = true
    subscription_id      = "00000000-0000-0000-0000-000000000000"
    tenant_id            = "00000000-0000-0000-0000-000000000000"
  }
}

When authenticating using AzureAD Authentication:

Code Block
data "terraform_remote_state" "foo" {
  backend = "azurerm"
  config = {
    storage_account_name = "tofu123abc"
    container_name       = "tofu-state"
    key                  = "prod.terraform.tfstate"
    use_azuread_auth     = true
    subscription_id      = "00000000-0000-0000-0000-000000000000"
    tenant_id            = "00000000-0000-0000-0000-000000000000"
  }
}

Note

When using AzureAD for Authentication to Storage you also need to ensure the Storage Blob Data Owner role is assigned.

When authenticating using the Access Key associated with the Storage Account:

Code Block
data "terraform_remote_state" "foo" {
  backend = "azurerm"
  config = {
    storage_account_name = "tofu123abc"
    container_name       = "tofu-state"
    key                  = "prod.terraform.tfstate"

    # rather than defining this inline, the Access Key can also be sourced
    # from an Environment Variable - more information is available below.
    access_key = "abcdefghijklmnopqrstuvwxyz0123456789..."
  }
}

When authenticating using a SAS Token associated with the Storage Account:

Code Block
data "terraform_remote_state" "foo" {
  backend = "azurerm"
  config = {
    storage_account_name = "tofu123abc"
    container_name       = "tofu-state"
    key                  = "prod.terraform.tfstate"

    # rather than defining this inline, the SAS Token can also be sourced
    # from an Environment Variable - more information is available below.
    sas_token = "abcdefghijklmnopqrstuvwxyz0123456789..."
  }
}

Configuration Variables

Warning

We recommend using environment variables to supply credentials and other sensitive data. If you use -backend-config or hardcode these values directly in your configuration, OpenTofu will include these values in both the .terraform subdirectory and in plan files. Refer to Credentials and Sensitive Data for details.

The following configuration options are supported:

storage_account_name - (Required) The Name of the Storage Account.
container_name - (Required) The Name of the Storage Container within the Storage Account.
key - (Required) The name of the Blob used to retrieve/store OpenTofu's State file inside the Storage Container.
environment - (Optional) The Azure Environment which should be used. This can also be sourced from the ARM_ENVIRONMENT environment variable. Possible values are public, china, german, stack and usgovernment. Defaults to public.
endpoint - (Optional) The Custom Endpoint for Azure Resource Manager. This can also be sourced from the ARM_ENDPOINT environment variable.

Note
An endpoint should only be configured when using Azure Stack.
metadata_host - (Optional) The Hostname of the Azure Metadata Service (for example management.azure.com), used to obtain the Cloud Environment when using a Custom Azure Environment. This can also be sourced from the ARM_METADATA_HOSTNAME Environment Variable.
snapshot - (Optional) Should the Blob used to store the OpenTofu Statefile be snapshotted before use? Defaults to false. This value can also be sourced from the ARM_SNAPSHOT environment variable.

When authenticating using the Managed Service Identity (MSI) - the following fields are also supported:

resource_group_name - (Required) The Name of the Resource Group in which the Storage Account exists.
msi_endpoint - (Optional) The path to a custom Managed Service Identity endpoint which is automatically determined if not specified. This can also be sourced from the ARM_MSI_ENDPOINT environment variable.
subscription_id - (Optional) The Subscription ID in which the Storage Account exists. This can also be sourced from the ARM_SUBSCRIPTION_ID environment variable.
tenant_id - (Optional) The Tenant ID in which the Subscription exists. This can also be sourced from the ARM_TENANT_ID environment variable.
use_msi - (Optional) Should Managed Service Identity authentication be used? This can also be sourced from the ARM_USE_MSI environment variable.

When authenticating using a Service Principal with OpenID Connect (OIDC) - the following fields are also supported:

oidc_request_url - (Optional) The URL for the OIDC provider from which to request an ID token. This can also be sourced from the ARM_OIDC_REQUEST_URL or ACTIONS_ID_TOKEN_REQUEST_URL environment variables.
oidc_request_token - (Optional) The bearer token for the request to the OIDC provider. This can also be sourced from the ARM_OIDC_REQUEST_TOKEN or ACTIONS_ID_TOKEN_REQUEST_TOKEN environment variables.
oidc_token - (Optional) The ID token when authenticating using OpenID Connect (OIDC). This can also be sourced from the ARM_OIDC_TOKEN environment variable.
oidc_token_file_path - (Optional) The path to a file containing an ID token when authenticating using OpenID Connect (OIDC). This can also be sourced from the ARM_OIDC_TOKEN_FILE_PATH environment variable.
use_oidc - (Optional) Should OIDC authentication be used? This can also be sourced from the ARM_USE_OIDC environment variable.

When authenticating using a SAS Token associated with the Storage Account - the following fields are also supported:

sas_token - (Optional) The SAS Token used to access the Blob Storage Account. This can also be sourced from the ARM_SAS_TOKEN environment variable.

When authenticating using the Storage Account's Access Key - the following fields are also supported:

access_key - (Optional) The Access Key used to access the Blob Storage Account. This can also be sourced from the ARM_ACCESS_KEY environment variable.

When authenticating using AzureAD Authentication - the following fields are also supported:

use_azuread_auth - (Optional) Should AzureAD Authentication be used to access the Blob Storage Account. This can also be sourced from the ARM_USE_AZUREAD environment variable.

Note
When using AzureAD for Authentication to Storage you also need to ensure the Storage Blob Data Owner role is assigned.

When authenticating using a Service Principal with a Client Certificate - the following fields are also supported:

resource_group_name - (Required) The Name of the Resource Group in which the Storage Account exists.
client_id - (Optional) The Client ID of the Service Principal. This can also be sourced from the ARM_CLIENT_ID environment variable.
client_certificate_password - (Optional) The password associated with the Client Certificate specified in client_certificate_path. This can also be sourced from the ARM_CLIENT_CERTIFICATE_PASSWORD environment variable.
client_certificate_path - (Optional) The path to the PFX file used as the Client Certificate when authenticating as a Service Principal. This can also be sourced from the ARM_CLIENT_CERTIFICATE_PATH environment variable.
subscription_id - (Optional) The Subscription ID in which the Storage Account exists. This can also be sourced from the ARM_SUBSCRIPTION_ID environment variable.
tenant_id - (Optional) The Tenant ID in which the Subscription exists. This can also be sourced from the ARM_TENANT_ID environment variable.

When authenticating using a Service Principal with a Client Secret - the following fields are also supported:

resource_group_name - (Required) The Name of the Resource Group in which the Storage Account exists.
client_id - (Optional) The Client ID of the Service Principal. This can also be sourced from the ARM_CLIENT_ID environment variable.
client_secret - (Optional) The Client Secret of the Service Principal. This can also be sourced from the ARM_CLIENT_SECRET environment variable.
subscription_id - (Optional) The Subscription ID in which the Storage Account exists. This can also be sourced from the ARM_SUBSCRIPTION_ID environment variable.
tenant_id - (Optional) The Tenant ID in which the Subscription exists. This can also be sourced from the ARM_TENANT_ID environment variable.

Backend Type: azurerm

Example Configuration​

Data Source Configuration​

Configuration Variables​

Example Configuration

Data Source Configuration

Configuration Variables